ПОДАВЛЕНИЕ СИГНАЛА ДЛЯ ИССЛЕДОВАНИЯ СПЕКТРА ДРУГОГО СИГНАЛА

Заявленный способ предназначен для подавления выделенного радиочастотного сигнала для исследования спектра по меньшей мере одного другого радиочастотного сигнала. Технический результат заключается в сокращении времени отклика. Способ содержит прием 602 смешанного сигнала 108 аналого-цифровым преобразователем 112. Смешанный сигнал содержит множество отдельных сигналов 104а-104n из различных источников 106а-106n сигналов. Смешанный сигнал оцифровывают 606 аналого-цифровым преобразователем. Генерируют идентичные первый оцифрованный сигнал 116 и второй оцифрованный сигнал 120. Первый оцифрованный сигнал задерживают 608 на заданное время задержки, а второй оцифрованный сигнал обрабатывают 610 в нейроморфическом процессоре 118 для обработки сигналов для выделения выделенного сигнала 122. Заданное время задержки соответствует задержке, встроенной 204 в нейроморфический процессор для обработки сигналов. Фазовую задержку и амплитуду выделенного сигнала регулируют 614 на основании фазовой задержки ...

БЕСПРОВОДНАЯ СТЫКОВКА С УПРАВЛЕНИЕМ С КОНТРОЛЕМ НЕСУЩЕЙ

Изобретение относится к беспроводной стыковке. Технический результат – оптимизация линии связи за счет того, что достаточно сильными будут являться только сигналы от соседних устройств. Для этого док-станция (220) для беспроводной стыковки с устройством (210) стыковки в среде совместно используемого спектра радиосигналов, использующей радиостандарт с механизмом контроля несущей для осуществления связи, причем док-станция (220) содержит: радиостанцию (224); и антенну (222), подсоединенную к радиостанции (224), причем радиостанция конфигурируется для вынуждения модификации порога определения механизмом контроля несущей, когда устройство (210) стыковки стыковано, чтобы установить его выше, чем модификация порога определения механизмом контроля несущей, когда устройство (210) стыковки расстыковано. 3 н. и 11 з.п. ф-лы, 15 ил.

Радиолиния с автоматической регулировкой параметров спектра с компенсацией помех

Изобретение относится к области радиотехники и может быть использовано в системах связи, осуществляющих автоматическую регулировку параметров спектра радиосигнала в интересах обеспечения электромагнитной совместимости с радиоэлектронными средствами, работающими одновременно с радиопередающим устройством в общих областях пространства и в полосах радиочастот внеполосного излучения радиопередающего устройства для обеспечения максимальной мощности и снижения вероятности битовой ошибки при приеме сигнала путем согласования параметров фильтра приемного устройства со спектральными характеристиками принимаемого сигнала в радиолинии, а также непрерывной компенсации аддитивных гауссовых помех в канале приема независимо от наличия сигнала и его уровня. Техническим результатом изобретения является повышение отношения сигнал-шум на первом входе цифрового вычислителя радиоприемного устройства путем компенсации аддитивной гауссовой помехи на выходе аналого-цифрового преобразователя. Радиолиния с автоматической ...

РЕЖЕКТОРНЫЙ ФИЛЬТР

Изобретение относится к радиолокационной технике и может быть использовано в когерентно-импульсных радиолокационных системах для выделения сигналов движущихся целей на фоне пассивных помех с неизвестными корреляционными свойствами. Техническим результатом изобретения является повышение эффективности режектирования пассивной помехи с априорно неизвестными корреляционными свойствами и выделения сигналов движущихся целей. Режекторный фильтр содержит первый, второй и третий блоки задержки, комплексный сумматор, комплексный перемножитель, измеритель доплеровской фазы, синхрогенератор, вычислитель весового коэффициента и весовой блок, определенным образом соединенные между собой. 10 ил.

УСТРОЙСТВО И СПОСОБ КАСКАДНОГО СОЕДИНЕНИЯ ФИЛЬТРОВ ИЗ РАЗНЫХ МАТЕРИАЛОВ

... 1. Фильтр, содержащий:по меньшей мере один первый фильтр, каждый из которых представляет собой полосно-заграждающий фильтр с первой группой параметров фильтра, которые определяются первым материалом, используемым для изготовления соответствующего первого фильтра;по меньшей мере один второй фильтр со второй группой параметров фильтра, которые определяются вторым материалом, используемым для изготовления соответствующего второго фильтра, каждый из которых представляет собой:полосно-заграждающий фильтр илиполосно-пропускающий фильтр;причем по меньшей мере один первый фильтр и по меньшей мере один второй фильтр соединяют последовательно друг с другом;первый и второй материалы различаются; ифильтр характеризуется третьей группой параметров фильтра, которые определяются как первым, так и вторым материалами.2. Фильтр по п.1, в котором каждый первый фильтр представляет собой узкополосный полосно-заграждающий фильтр с частотной характеристикой, имеющей по меньшей мере одну полосу задерживания, которая ...

ПРИЕМНИК СИГНАЛОВ С КОМПЕНСАЦИЕЙ ГРУППОВОЙ ЗАДЕРЖКИ

... 1. Приемник сигналов, содержащий:- антенный интерфейс для приема сигналов из антенны;- схему обработки аналоговых сигналов, соединенную с антенным интерфейсом для обработки принимаемых сигналов, чтобы формировать фильтрованные сигналы;- схему дискретизации, чтобы дискретизировать фильтрованные сигналы с тем, чтобы формировать оцифрованные принимаемые сигналы;- цифровой модуль компенсации, чтобы принимать оцифрованные принимаемые сигналы и компенсировать неравномерную групповую задержку, введенную посредством схемы обработки аналоговых сигналов, чтобы формировать компенсированные оцифрованные принимаемые сигналы; и- цифровой процессор, чтобы обрабатывать компенсированные оцифрованные принимаемые сигналы с тем, чтобы формировать результат.2. Приемник сигналов по п. 1, в котором цифровой модуль компенсации сконфигурирован с возможностью обрабатывать оцифрованные принимаемые сигналы с использованием фильтра с конечной импульсной характеристикой (FIR-фильтра) с комплексными коэффициентами фильтрации ...

VERFAHREN ZUR ELIMINATION VON WIEDERHOLENDEN INTERFERENZSIGNALEN

Erkennungsvorrichtung zur Modulationsgrad

Ausgleichsempfänger für ein zellulares Funkkommunikationssystem

Verfahren und Empfängerschaltung zur Reduzierung von Rfl-Störungen

Die Erfindung betrifft ein Verfahren zur Kompensation zumindest eines einem empfangenen DMT-Empfangssignal permanent überlagerten RFT-Störsignals bei einer DMT-Übertragung, bei dem zur Erzeugung eines Kompensationssignals zum Kompensieren des RFI-Störungssignals folgende Verfahrensschritte vorgenommen werden: Bereitstellen zumindest eines Referenzkanals aus der Vielzahl von Kanälen; Bereitstellen von kanalindividuellen Koeffizienten für zumindest einen zu kompensierenden Nutzkanal, die eine Korrelation des einem jeweiligen Nutzkanal überlagerten RFT-Störsignals, bezogen auf einen jeweiligen Referenzkanal, angeben; zur Generierung eines Kompensationssignals werden pro DMT-Rahmen für jeden zu kompensierenden Nutzkanal die Empfangssignale der Referenzkanäle mit den kanalindividuellen Koeffizienten bewertet und aufsummiert. Die Erfindung betrifft ferner eine Schaltungsanordnung zur Reduzierung von RFT-Störungen bei einer DMT-Datenübertragung.

VERFAHREN UND VORRICHTUNG ZUM GEMEINSAMEN ENTZERREN UND RAUSCHFORMEN IN EINEM SOFTWAREDEFINIERTEN FUNKGERÄT

Verfahren und Vorrichtung zum dynamischen Modifizieren von Filtercharakteristiken eines Delta-Sigma-Modulators zum Entzerren eines Signals im Delta-Signal-Modulator. Das System wird für ein Breitbandfunksystem verwendet, das sich an verschiedene globale Funkstandards und insbesondere an eine Mobilfunkarchitektur anpasst, die eine Kombination aus einem einzelnen Zirkulator, einem programmierbaren Bandpass-Sampling-Radiofrequenz-Frontend (RF) und einem optimierten digitalen Basisband verwendet, das in der Lage ist, alle aktuellen Mobilfunk-Zugangsprotokoll-Frequenzbänder zu unterstützen.

Signal interference suppression circuit - derives correction signals from information signals before and after addition of interference

The appts. uses encoding circuits to derive control signals. The control signals are derived from information signals both before and after they have been affected by interference during passage through a transmission channel. From the control signals there are derived by means of decoding circuits correction signals which are superimposed on the affected signals to remove the interference from them. The derivation of the control signals and the correction signals is performed e.g. by means of linear encoding and decoding circuits. These circuits consist of chains of linear filters or a first linear filter, a filter on non-linear positive slope and a second linear filter.

Signal to noise ratio improvement unit separating wanted signal from noisy detector signal

The signal to noise improvement unit is provided to separate a desired target signal from a noisy detector signal, by using adaptive filters (14). A filter (13) adapted to the statistics, i.e. the reflected function of the expected target signal in the detector signal, is connected after the adaptive filter. This filter is supplied with the substantially uncorrelated signal (16) from the adaptive filter designed as a digital Weissmacher filter. Not only the coefficients (11) for the adaptive filter but also those for the Weissmacher filter are derived from the instantaneous detector signal, still essentially determined from the noisy signal ...

SCHALTUNG ZUR DIGITALEN HF-INTERFERENZUNTERDRÜCKUNG

VERBESSERUNGEN EINES TEILNEHMERÜBERTRAGUNGSSYSTEMS

Dynamic optimisation of block transmissions for interference avoidance

Reduction of intermodulation products

Method and apparatus for performing targeted interference suppression

Adjacent channel interference radio wave elimination in a mobile radio communication system

An interference radio wave elimination device receiving input signals including desired radio frequency signals and interference radio frequency signals that interferences desired radio frequency signal, and then eliminates the interference radio frequency signals. First, an amplifier amplifies the interference radio frequency signal. A digital demodulator (17) demodulates the interference radio frequency signals amplified by the amplifier. A digital modulator (18) modulates the internal carrier signal to make interference radio frequency signals in a digital form by using the demodulated interference information. An adder (21) eliminates the interference radio frequency signals of the digital form from the input signals.

Circuits and methods related to switchless carrier aggregation in radio-frequency receivers

A multiple input low noise amplifier circuit may include a first input stage 142 for receiving a first RF signal in a first band, and a second input stage 144 for receiving a second RF signal in a second band. The signal paths may include filters, not shown, for the respective bands. Each of the input stages 142 and 144 may act as a current converter that provides amplification for its respective RF signal. The processed first and second RF signals may be added at common node 136 and further processed by a transistor 146 to provide an output RF signal at output node 138. The first current converter 142 and the transistor 146 operate together as first cascode amplifier. Similarly, the second current converter 144 and the transistor 146 operate together as second cascode amplifier. Alternatively (fig.9) each input stage may be coupled to its own cascode transistor. Bias switches S1 and S3 may be used to turn on one or other amplifier, or both amplifiers, to combine signals. The signal paths ...

Circuits and methods related to switchless carrier aggregation in radio-frequency receivers

ADAPTIVE FILTER

Processing interference in a wireless network

Arrangement for the suppression of signal interference

An arrangement for the suppression of signal interference removes the interference components from the useful signals, which interference components are additively superimposed on the useful signals during transmission via two electrical lines 2, 3. The two transmission lines couple an electric signal source 4 to a processing circuit 1. The transmission lines 2, 3 have different sensitivities to interference signals, i.e. only the line 2 includes a shield 5 against interference signals 6. The processing circuit includes correlation networks, subtraction circuits and dividers which operate on the signals from the two lines to derive an interference-free useful signal at the output of the processing circuit.

Improvements in or relating to mobile radio receivers

Fading of a received signal in a mobile radio receiver is corrected by apparatus which includes mixers 21, 22 (Fig. 1) for mixing the received pilot signal with a locally generated signal to produce orthogonal signals I, Q. The signals I, Q are processed by a circuit 28 according to a given relationship to produce signals A, B. The signals A, B are used to modulate the received signal in mixers 15, 16. The outputs of the mixers 15, 16 are combined to produce a signal corrected for fading both in amplitude and frequency. In a further embodiment (Fig. 3) the signals A and B are coupled via modulators 30, 31 to the mixers 15 and 16. The modulators 30 and 31 are modulated by the locally generated pilot signals from 24. ...

Receiver circuit

Interference radio wave elimination device and interference radio wave elimination method

CAR RADIO WITH A DIGITAL ONE ENTZERRERNETZWERK

DISTORTION CORRECTION CIRCUIT OF A DIRECT CONVERSION RECEIVER

Noise suppressing apparatus capable of preventing deterioration in high frequency signal characteristic after noise suppression and in balanced signal transmitting

Arrangement and method for interference cancelling

Digital radio frequency interference canceller

Method of eliminating repetitive interfering signals

Frequency multiplex transmitter and method for eliminating crosstalk

SINGLE SIDEBAND RECEIVER WITH PILOT-BASED FEED FORWARD CORRECTION FOR MOTION-INDUCED DISTORTION

... : Effects of multipath fading and Doppler frequency spread in a single sideband radio communication system are largely overcome by separating from a received signal spectrum, a pilot frequency component including those effects and using that component to accomplish both phase and gain corrections on an information-containing frequency component. Signals essentially free of those effects are provided for controlling necessary frequency translations in the receiver. One illustrative embodiment is conveniently arranged for facilitating diversity signal combining.

SPECTRUM NOTCHER

Disclosed is an adaptive filter for suppressing interfering narrow-band signals in a composite signal containing a desired broad-band signal. The adaptive filter is useful in a system which uses a broad-band signal and signal processing apparatus to derive information from the broadband signal. In one embodiment the system makes use of a delay line to provide a delayed replica of the composite signal which is used to provide a correction signal to cancel the interfering narrow-band signal. The desired broad-band signal is not canceled by the adaptive filter.

APPARATUS AND METHOD FOR ATTENUATING INTERFERING SIGNALS

A TUNEABLE CIRCUIT FOR CANCELING THIRD ORDER MODULATION

DIGITAL SIGNAL RECEIVING APPARATUS

A digital signal receiving apparatus includes: detection-judging portion judging a possible presence of a desired signal when a signal level of a smoothed signal is greater than a reference level, wherein said first smoothed signal and said second smoothed signal are compared in order to generate a detection signal representing a judgment of a possible presence of a desired signal, said second smoothed signal having a convergen ce speed slower than that of the first smoothing filter, a filter controlling portion switching an adaptive filter from an adaptive mode to a non-adaptive mode when the detection-judging portion judges the possible presence of the desired signal and switching from the non-adaptive mode to the adaptive mode when the detection-judging portion judges the absence of the desired signal; a limiting portion limiting a signal level of an auto-correlation signal to th e signal level of the smoothed signal; and a demodulating portion demodulating the auto-correlatio n signal ...

CROSS POLARIZATION INTERFERENCE COMPENSATING METHOD, AND CROSS POLARIZATION INTERFERENCE COMPENSATING DEVICE

A cross polarization interference compensating device comprises an error detector (26) for extracting a phase difference between a modulated signal or a signal, of which a self-polarization was subjected to a cross polarization interference compensation, and a normal reception signal of the self- polarization, to output an error signal indicating the phase difference extracted, a phase noise detector (27) for comparing the cross polarization interference compensation signal or the signal, of which the self-polarization was subjected to the cross polarization interference compensation, to extract and output a phase noise difference, a control signal generation unit for generating a control signal corresponding to the phase noise difference, and a phase rotator (18') arranged at the front stage or the rear stage of a cross polarization interference compensator for generating a cross polarization interference compensation signal, to control, when the control signal is inputted thereto, the ...

Structure Generated Composite Reference Signal for Interference Supression in an Adaptive Loop

NOISE SUPPRESSING APPARATUS CAPABLE OF PREVENTING DETERIORATION IN HIGH FREQUENCY SIGNAL CHARACTERISTIC AFTER NOISE SUPPRESSION AND IN BALANCED SIGNAL TRANSMITTING SYSTEM

A noise suppressor has signal detecting device 1 for detecting signals A and B on signal lines, sum signal generating device 21 for summing the detected signals, difference signal generating device 22 for differencing the detected signals, noise canceling device 3 for suppressing or removing noise components in a difference signal generated by the difference signal generating device and signal separating device 4 for separating the signal to those corresponding to the signal lines, according to the difference signal with the noise components suppressed or removed and the sum signal. 86 ...

Fast Settling, Wide Dynamic Range Vector Modulator

A fast settling, wide dynamic range vector modulator for use in an interference cancellation system or the like includes a quadrature hybrid which receives an RF signal and divides the signal into a primary in-phase component signal and a primary quadrature phase component signal. A first 180.degree. hybrid receives the primary in-phase component signal and provides first and second secondary in-phase component signals which are 180.degree. out of phase with each other. A second 180.degree. hybrid receives the primary quadrature phase component signal and provides first and second secondary quadrature phase component signals which are 180.degree. out of phase with each other. A first switching device selects one of the first and second secondary in-phase component signals, and a second switching device selects one of the first and second secondary quadrature phase component signals. First and second coarse attenuators respectively provide a selectable amount of attenuation to the selected ...

COMBATING SIGNAL INTERFERENCE IN DIGITAL TRANSMISSION

A device and method for removing signal interference from a digital signal by using an adaptive filter which tunes to the periodic components of the interfering signal. The output of the adaptive filter is then subtracted from the received signal to produce an error signal. This error signal is then used to recursively update the taps of the adaptive filter. The invention also relates to the use of the adaptive filter in conjunction with a DFE.

MONTAGE COMPORTANT UN ORGANE DE TRANSMISSION NON LINEAIRE POSSEDANT UNE ZONE MORTE POUR LA SUPPRESSION DE LA COMPOSANTE PARASITE DE SIGNAUX DE MESURE PARASITES

L'invention concerne un montage comportant un organe de transmission non linéaire possédant une zone morte pour la suppression de la composante parasite de signaux de mesure parasités. Dans ce montage, la sortie d'un organe différenciateur 1 est reliée à l'entrée de l'organe de transmission non linéaire 2 possédant une zone morte réglable et une amplification élevée dans la bande passante, avec comme grandeurs d'entrées le signal de mesure et le signal de sortie Ua du montage, et un organe additionneur 3, dont les entrées sont reliées aux sorties de l'organe différentiel 1 et de l'organe de transmission non linéaire 2, alimente un organe intégrateur 4 possédant un temps réglable d'intégration et dont la sortie délivre le signal de sortie Ua du montage. Application notamment aux filtres d'entrée pour des dispositifs de mesure, de réglage ou d'enregistrement ...

FILTER FREQUENCY RANGES ADAPTIVE NON-LINEAR LOW PHASE OFFSET

PROCESS AND DEVICE FOR the DETERMINATION Of a USEFUL SIGNAL

EXTENSION LIMITER BROADBAND INTERFERENCE WITH NEGATIVE GROUP DELAY AND METHOD FOR CANCELING INTERFERENCE BROADBAND

Frequency shift keying components processing device for wireless communication signal, has frequency converter to change received signal into baseband signal, polarization detector to establish distinction between components

Un premier aspect de l'invention peut se rapporter à la réduction d'une interférence dans un signal de communications reçu. Le premier aspect peut comprendre d'une façon générale un filtrage du signal reçu en utilisant un filtre adaptatif. L'adaptabilité du filtre peut être commandée conformément au fait qu'un signal intéressant est détecté. Un second aspect de l'invention peut se rapporter à une technique pour traiter et/ou démoduler de façon non cohérente et/ou détecter un signal à modulation FSK. Le second aspect peut comprendre d'une façon générale un changement de fréquence du signal en une bande de base (complexe) centrée à une fréquence nulle, et analyser une polarisation du signal à l'intérieur de la bande de base. Parmi les fréquences à modulation FSK, une première fréquence supérieure présente une première polarisation, et une seconde fréquence inférieure présente une seconde polarisation opposée à la première polarisation.

COMPRISING COMMUNICATION SYSTEM OF the RADIATING-RECEIVING ANTENNAE CLOSE RELATIONS FROM/TO EACH OTHER

COMPRISING COMMUNICATION SYSTEM OF the RADIATING-RECEIVING ANTENNAE CLOSE RELATIONS FROM/TO EACH OTHER

COMPRISING COMMUNICATION SYSTEM OF the RADIATING-RECEIVING ANTENNAE CLOSE RELATIONS FROM/TO EACH OTHER

COMPRISING COMMUNICATION SYSTEM OF the RADIATING-RECEIVING ANTENNAE CLOSE RELATIONS FROM/TO EACH OTHER

COMPRISING COMMUNICATION SYSTEM OF the RADIATING-RECEIVING ANTENNAE CLOSE RELATIONS FROM/TO EACH OTHER

COMPRISING COMMUNICATION SYSTEM OF the RADIATING-RECEIVING ANTENNAE CLOSE RELATIONS FROM/TO EACH OTHER

COMPRISING COMMUNICATION SYSTEM OF the RADIATING-RECEIVING ANTENNAE CLOSE RELATIONS FROM/TO EACH OTHER

트랜시버 및 트랜시버의 자체-간섭을 감소시키기 위한 방법

... 트랜시버(1000)는 무선 송신 채널을 인터페이싱하도록 구성되고, 전송 신호(202)를 수신하기 위한 인터페이스(110) 및 수신 신호(106)를 제공하기 위한 인터페이스를 포함하는 안테나 장치(100)를 포함한다. 트랜시버는 메인 송신기(200), 아날로그 도메인 필터(300; 300'; 300''; 300'''), 보조 송신기(400), 무선 주파수 간섭 제거 스테이지(500), 메인 수신기(600), 피드백 수신기(700) 및 디지털 신호 동작들을 수행하도록 구성되는 프로세서(800; 800')를 포함한다. 트랜시버(1000)는 무선 주파수 도메인 및 디지털 도메인에서 수신 신호에 대한 간섭 제거를 수행하도록 구성된다.

METHOD AND SYSTEM FOR REDUCING SIGNAL INTERFERENCE

Signals propagating on an aggressor communication channel can cause interference in a victim communication channel. A sensor coupled to the aggressor channel can obtain a sample of the aggressor signal. The sensor can be integrated with or embedded in a system, such as a flex circuit or a circuit board, that comprises the aggressor channel. The sensor can comprise a dedicated conductor or circuit trace that is near an aggressor conductor, a victim conductor, or an EM field associated with the interference. An interference compensation circuit can receive the sample from the sensor. The interference compensation circuit can have at least two operational modes of operation. In the first mode, the circuit can actively generate or output a compensation signal that cancels, corrects, or suppresses the interference. The second mode can be a standby, idle, power-saving, passive, or sleep mode. © KIPO & WIPO 2007 ...

INTERMODULATION DISTORTION DETECTION AND MITIGATION

Techniques for detecting and mitigating intermodulation distortion (IMD) are described. A device (e.g., a cellular phone) obtains digital intermodulation distortion and digitally determines intermodulation distortion in an input signal based on the digital intermodulation distortion. The device may correlate the digital intermodulation distortion with the input signal and determine intermodulation distortion in the input signal based on correlation results. The device may adjust the operation of one or more circuit blocks (e.g., a mixer, an LNA, etc.) in a receiver based on the detected intermodulation distortion in the input signal. Alternatively or additionally, the device may condition the digital intermodulation distortion to obtain conditioned intermodulation distortion matching intermodulation distortion in the input signal and may then subtract the conditioned intermodulation distortion from the input signal.

ACTIVE CANCELLATION OF A WIRELESS COUPLED TRANSMIT SIGNAL

An active cancellation device receives a model of a first signal from a local wireless transmitter. The first signal causes a coupled signal that interferes in a second signal received by a local wireless receiver from a remote wireless transmitter. The active cancellation device generates a cancellation signal based on the model of the first signal, and provides the cancellation signal to the local wireless receiver. At the local wireless receiver, the cancellation signal combines with the coupled signal and the second signal. The cancellation signal reduces the interference in the second signal caused by the coupled signal.

BROADBAND INTERFERENCE CANCELLATION

A method and apparatus are provided for broadband cancellation of interference signals. A signal transmitted on one communication path acts as an interference signal to a receiver on a second communication path in the system. In an embodiment, a signal transmitted from an antenna using one wireless standard, or protocol, acts as an interference signal for another antenna, co–located in the same system, using another wireless standard, or protocol, and operating in the same or nearby frequency bands. A time delay is applied to a signal sampled from the interference signal to provide substantially broadband cancellation of the interference signal. The sampled signal may be attenuated to match the amplitude of the interference signal on the second communication path. Coupling of the sampled signal from one communication path to the other communication path can provide an 180° phase shift to the sampled signal.

Radio receiver

Various apparatuses and methods are described to reduce interference in signals subject to intermodulation products and high power narrow band interfering signals on lower power wideband signals. Apparatuses and methods described herein also provide the capability for supporting multi-standards, multi-modes and multi-bands in wireless and wired applications with a single receiver or a receiver with minor variations. The receiver described herein samples the entire band in which there can be signals of interest or signals that can generate interference. All of these signals are sampled in one bit stream and the bit stream is processed to isolate signals of interest and interfering signals. The isolated interfering signals are then cancelled out of the signals of interest.

Bandpass filter with integrated variable gain function

The invention enables a gain adjustment in a receiver to improve signal quality.

Compensation for second order intermodulation in a homodyne receiver

A homodyne radio receiving apparatus is provided for mitigating fixed or variable DC offsets produced by residual second order intermodulation terms due to unwanted signals. The homodyne radio receiving apparatus includes an antenna, an antenna by-pass filter, an RF amplifier and a quadrature downconverter. The quadrature downconverter for the complex base band is centered around a desired reception frequency so that the complex baseband signals lie around zero frequency. A supplementary total power detector is provided to measure the total received power through the antenna by-pass filter so that the unwanted terms caused by second order intermodulation are compensated. The compensation is achieved by feeding instantaneous power measurements to a signal processing unit along with the complex baseband signals. The signal processing unit then determines a complex compensation coefficient by correlating the power signal with the complex baseband signals. The complex compensation coefficient ...

Multi user detection using equalization and successive interference cancellation

A plurality of signals are received in a shared spectrum. Samples of the received user signals are produced as a received vector. The received vector is segmented into a plurality of segments. For each segment, successively determining symbols for each user or group of signals (the group of signals having similar received power) by determining symbols for one user/group and removing a contribution of that one user/group from the received vector. The determined symbols corresponding to each segment are assembled into a data vector.

DC BALANCE OFFSET ADJUSTABLE CIRCUIT AND SEMICONDUCTOR DEVICE INCLUDING THE SAME

A mechanism is provided for dynamically adjusting DC offset at the time of deviation from DC balance ½ (DC level) in a data pattern including long-period consecutive bits generating DC offset in a section of data. A receiver circuit unit of an LSI having a serializer/deserializer arrangement for performing high-speed serial transmission includes an offset adjusting circuit. The offset adjusting circuit calculates DC balance in an arbitrary section of data by averaging received serial data. Based on comparison between a DC level and the DC balance obtained by averaging the received data, offset is shifted toward the H side when the DC balance exists on the H side from the DC level, and shifted toward the L side when the DC balance exists on the L side. 1. A semiconductor device , comprising:a receiver circuit which includesa receiver receiving high-speed serial data,a clock data recovery circuit restoring a clock from received serial data,a deserializer performing serial to parallel conversion of the received date, andan offset optimization control circuit detecting offset relative to DC balance in an arbitrary section of the received data, and adjusting DC offset of the receiver,whereinthe offset optimization control circuit includes an averaging circuit averaging the received data in the arbitrary section, and an offset detection circuit detecting DC offset between a DC balance of the received data obtained by the averaging circuit and a DC level, andthe offset optimization control circuit adjusts DC offset of the receiver in accordance with the detected DC offset.2. The semiconductor device according to claim 1 , wherein the offset detection circuit determines at least one arbitrary threshold for detecting a DC offset value claim 1 , and compares high/low DC balance of the received data in the arbitrary section with the DC level to detect DC offset.3. The semiconductor device according to claim 1 , wherein the offset optimization control circuit shifts offset by ...

Tunable filter devices and methods

Analog interference filter devices and methods for isolation of desirable portions of a radio frequency signal. Signal compensation is used to provide desirable center frequency, passband width, ripple, rolloff, stopband and distortion performance. The filter is implemented with passive and/or active components.

SYSTEMS AND METHODS FOR MITIGATION OF SELF-INTERFERENCE IN SPECTRALLY EFFICIENT FULL DUPLEX COMMINUCATIONS

Systems and methods which provide mitigation of self-interference in spectrally efficient full duplex (e.g., transmit and receive using the same frequency simultaneously) communications are described. Embodiments provide an interference mitigation structure having a multi-tap vector modulator interference cancellation circuit operable to cancel time varying multipath interference in the analog RF domain. A multi-tap vector modulator interference cancellation circuit of embodiments may comprise part of a multi-stage interference cancellation circuit, such as a multi-stage interference cancellation circuit comprising a multi-tap vector modulator interference cancellation circuit and a digital residual interference cancellation circuit. A digital residual interference cancellation circuit of embodiments provides residual interference cancellation. A multi-stage interference cancellation circuit configuration of embodiments is operable to provide cancellation of strong multipath signals as ...

Co-channel interference in a receiver

The invention relates to a reception method and a receiver for a TDMA radio system, in which received signals include a desired signal and one or more interference signals, which desired signal and interference signal include a predetermined sequence, by which the signals can be separated from each other. The receiver searches for the most interfering interference signal and forms a signal estimate of the desired signal using the predetermined sequence of the desired signal. The receiver then forms the first residual signal, which describes the difference between the signal estimates of the received signal and the desired signal; the receiver then forms the second residual signal, which describes the difference between the received signal and the co-channel signal estimate. The receiver compares the first residual signal with the second residual signal and based on the comparison, selects either single detection or joint detection to detect the received signal.

TUNABLE FILTER DEVICES AND METHODS

Analog interference filter devices and methods for isolation of desirable portions of a radio frequency signal. Signal compensation is used to provide desirable center frequency, passband width, ripple, rolloff, stopband and distortion performance. The filter is implemented with passive and/or active components.

ADAPTIVE FREQUENCY BAND WEIGHTING WITHIN TIME DOMAIN

Various signal processing systems may benefit from appropriate control based on selected parameters. For example, feedforward-based signal or noise cancellation systems may benefit from adaptive frequency band weighting within time domain. A method can include receiving an input signal that is to be transmitted over a channel. The method can also include calculating an instantaneous frequency of the input signal. The method can further include applying the instantaneous frequency as an adaptive parameter in an adaptation performed relative to the input signal. The method can additionally include providing an output signal based on the adaptation.

HIGH-SPEED SIGNALING SYSTEMS AND METHODS WITH ADAPTABLE, CONTINUOUS-TIME EQUALIZATION

A receiver includes a continuous-time equalizer, a decision-feedback equalizer (DFE), data and error sampling logic, and an adaptation engine. The receiver corrects for inter-symbol interference (ISI) associated with the most recent data symbol (first post cursor ISI) by establishing appropriate equalization settings for the continuous-time equalizer based upon a measure of the first-post-cursor ISI.

TUNABLE FILTER

A tunable filter with wide tuning range and high out-of-band rejection is achieved with a tunable bandpass filter and a number of cascaded, fixed frequency Lame-Mode Resonators (LMRs) notch filters or other resonators. In some embodiments, the filter can be implemented with all of the elements on an integrated circuit, saving space for use in applications such as mobile phones or other mobile communication devices.

Signal processing apparatus

The present invention involves a method and an apparatus for analyzing measured signals, including the determination of a measurement of correlation in the measured signals during a calculation of a physiological parameter of a monitored patient. Use of this invention is described in particular detail with respect to blood oximetry measurements.

Highly linear receiver front-end with thermal and phase noise cancellation

A radio receiver supporting cancellation of thermal and phase noise in a down-converted RF signal. An inbound RF signal and blocking signal are provided directly to a passive mixer for down-conversion into a first baseband signal having data, thermal noise, and reciprocal mixing (RM) noise components. The inbound signals are also provided to a transconductance circuit, the output of which is provided to a second passive mixer for conversion into a current signal having data and blocking signal components, and a RM image. The blocking signal component and the RM image are mixed with a second LO signal, derived from the blocking signal, to produce a RM noise cancellation signal. The data component of the current signal is converted into a second baseband signal having data and thermal noise components. The first baseband signal, second baseband signal and RM noise cancellation signal are then combined through harmonic recombination.

Apparatus and method for feed-forward image rejection in a dual conversion receiver

A receiver portion includes a bandpass filter (e.g. SAW filter) that performs channel selection from an input signal having a plurality of channels, and an image cancellation circuit that is in parallel with the bandpass filter. The bandpass filter performs channel selection to select a desired channel that falls in a passband of the bandpass filter. Since the passband is typically a few channels wide, the image channel falls outside the passband and is attenuated by the stopband attenuation of the bandpass filter. The image cancellation circuit includes an attenuator and a phase shifter. The attenuator is configured to have the same attenuation as the stopband attenuation of the bandpass filter at the image channel frequency, and phase shifter is configured to provide a phase shift of approximately 180 degrees. Therefore, the image cancellation circuit has an output that is equal in amplitude, but opposite in phase, to that of the bandpass filter at the image channel frequency. A summer ...

METHODS AND APPARATUS TO PERFORM AN AUTOMATED GAIN CONTROL PROTOCOL WITH AN AMPLIFIER BASED ON HISTORICAL DATA CORRESPONDING TO CONTEXTUAL DATA

Methods and apparatus to perform an automated gain control protocol with an amplifier based on historical data corresponding to contextual data are disclosed. An example apparatus includes a controller to select an automatic gain control (AGC) parameter for an AGC protocol based on historical data corresponding to contextual data, the contextual data including at least one of a time during which the AGC protocol is performed, a panelist identified by a meter, demographics of an audience identified by the meter, a location of the meter, a station identified by the meter, a media type identified by the meter, or a sound pressure level identified by the meter; and a processor to perform the AGC protocol based on the selected AGC parameter.

RADIO FM RECEIVER

Programmable IF frequency filter for enabling a compromise between DC offset rejection and image rejection

The invention enables a compromise between DC offset rejection and image rejection through the use of a bandpass filter having a variable center frequency.

MULTI USER DETECTION USING EQUALIZATION AND SUCCESSIVE INTERFERENCE CANCELLATION

Radio communication system, radio station and radio communication method

METHOD FOR REMOVING INTERFERENCE WAVE, RECEIVER AND COMMUNICATION SYSTEM WHICH USE THE METHOD

CO-CHANNEL INTERFERENCE REDUCTION

COORDINATED INTERFERENCE CLEANING WITH KNOWN INTERFERER LOCATION AND TIMING

Dynamic optimisation of block transmissions for interference avoidance

Reduction of interference due to intermodulation

Reduction of interference (I3) to a received signal due to intermodulation products of signals transmitted in a wireless network, the interference comprising intermodulation products of at least a first signal (C1) and a second signal (C2). Delayed interference signals comprising simulated intermodulation products are generated on the basis of the first signal (C1) and the second signal (C2) using a range of differing delay values (52, 64, 66, 68, 70, 84), and each of the delayed interference signals is correlated with the received signal to produce data representing a correlation for each delayed interference signal. At least one delay value is selected in dependence on a comparison of the data representative of the correlations and an interference signal comprising simulated intermodulation products generated from the first signal (C1) and the second signal (C2) using the at least one delay value is combined with the received signal. The invention has particular application in mitigating ...

Pulsed interference canceller

An interference canceller of the kind which serves to suppress a dominant interfering signal in the presence of smaller wanted signals is disabled in the absence of the dominant interfering signal because wanted signals tend to become dominant in these circumstances and to be themselves suppressed. Main and auxiliary receiver channels are fed from separate receiving aerials 1, 2 and a feedback signal comprising interference and wanted signals is fed from the auxiliary channel to the main channel via a vector modulator 34 responsive to control signals derived from respective channels via a correlator 16 for controlling the phase and amplitude of the feedback signals so that the dominant interfering signal is thereby suppressed. The invention provides switch means 30, 31 for inhibiting operation of the canceller when an interfering signal is absent.

A method for reducing interference to communications in time division duplexing (TDD) mode between a TDD mobile and a TDD base station

Processing interference in a wireless network

This application is concerned with reducing interference caused to a receiver due to passive intermoduation (PIM) and/or passive harmonic (PH) products. In an embodiment a received waveform 10 is affected by interference I3 resulting from non-linear products of components of a first transmit signal C1 and a components of a second transmit signal C2 (see Fig. 1). More generally the non-linear products could be produced from a single signal. A plurality of interference product streams (46a, 46b) are generated, each stream comprising a stream of time samples of a simulated non-linear product of components of the signal (or signals) which contribute to the interference. At least two of the plurality of interference product streams are processed to reduce a degree of correlation between the streams. The processing may involve an orthogonalization step. The resulting processed interference product streams (60a, 60b) are correlated 56 with the received waveform 10 to produce a plurality of respective ...

Wideband interference mitigation system with negative group delay and method for wideband interference cancellation

A wideband interference mitigation (IM) system divides an input signal 101 into a primary path 114 and an auxiliary path 124. The desired signal is removed from the signal passing through the auxiliary signal path, but interfering signals within a bandwidth of interest are retained. The auxiliary path includes interference cancellation circuitry 106 for generating a signal to combine 116 with the primary path in order to cancel interference from the primary path. The interference cancellation circuitry includes an element with negative group delay (NGD) 110. The negative group delay is to compensate for the group delay of other elements of the auxiliary signal path, to minimise group delay differences between the primary and auxiliary paths. The system may be applied in a receiver, between an antenna and a low noise amplifier (LNA). The cancellation circuitry preferably additionally includes a band-pass filter 108. The auxiliary path preferably includes first and second frequency selective ...

A method of controlling noise rise in a cell

A multipath distortion compensation circuit

A multipath distortion compensation circuit comprises an FM detector, an AGC circuit, an envelope detector, a capacitor, a function generator, an analog multiplier, first and second operational circuits, first and second variable delay circuits, and a plurality of switching circuits for producing a demodulated signal having no distortion components caused by multipath interference. The switching circuits are used to selectively constitute one of first and second arrangements by changing the connections among the circuits. The first and second arrangements are respectively used depending on whether the magnitude of a direct wave received by a receiving antenna is greater than that of an indirect wave, such as a reflected wave, also received by the antenna. A suitable compensation signal is produced and is subtracted from the demodulated signal to cancel the distortion components.

EQUIPMENT AND PROCEDURE FOR SIGNAL PROCESSING

DETECTOR TO GLEICHKANALSTÖRUNGEN IN ZELLULAREN COMMUNICATION SYSTEMS

DEVICE AND PROCEDURE FOR THE DISTURBANCE SUPPRESSION

RECOGNITION DEVICE TO MODULATION FACTOR

DETECTION AND DECREASE OF INTERMODULATION DISTORTIONS

Receiver with Orthogonal Beam Forming Technique

A receiver with orthogonal beam forming technique is achieved that is capable of differentiating different signal components within the received composite signal. An adaptive processor is used to eliminate the signal component whose phase information is known or can be calculated. The phase information of the major component of a signal can be easily acquired by using a limiter. The phase information of other signal components can be acquired by their direction information and other characteristics, such as modulation scheme, etc. Multiple orthogonal beams can be formed by eliminating one unwanted signal component each time by the adaptive processor until all unwanted signal is eliminated. Thus, a composite signal from multiple sources can be broken down into their component signals.

Method and device for operating a precoded mimo system

A method is provided for generating precoder data ( 600 ), comprising: obtaining transmit power data indicative of a transmit power of a plurality of multiple-input/multiple-output signals ( 610 ); obtaining signal quality data, the signal quality data including at least one measure of a quality of the plurality of multiple-input/multiple-output signals ( 620, 630 ); obtaining channel data with respect to a wireless channel, the channel data including a measure of respective channel parameters of each of a plurality of channel paths in the wireless channel ( 620, 630 ); constraining one or more system performance parameters ( 640 ); and determining first and second precoder diagonal values (w A and w B ) based on the signal quality data, the transmit power data, the channel data, and the one or more constrained system performance parameters ( 650 ).

Detection and mitigation of interference in a receiver

A novel receiver architecture optimizes receiver performance in the presence of interference. In various embodiments, power estimation circuits are used with variable selectivity to determine the exact nature of the interference and to optimize the performance correspondingly. The variable selectivity is achieved using stages of filtering with progressively narrower bandwidths. Also, the actual method of optimizing the receiver performance is novel compared to the prior art in that the gain settings and the baseband filter order (stages to be used) will be optimized based on the nature of the interference as determined by the power detector measurements. For a device such as a cellular phone that operates in a dynamic and changing environment where interference is variable, embodiments advantageously provide the capability to modify the receiver's operational state depending on the interference.

Interference suppression method and interference suppression device

A reception station 1 b compares its BSSID with BSSID included in a signal that has arrived thereat. As BSSIDs included in signals transmitted by interfering stations 1 c and 1 d both match BSSID of the reception station 1 b , the reception station 1 b identifies each of the interfering stations 1 c and 1 d as a non-suppression target transmission source. As neither of BSSIDs included in signals transmitted by interfering stations 2 a and 2 b matches BSSID of the reception station 1 b , the reception station 1 b identifies each of the interfering stations 2 a and 2 b as a suppression target transmission source. The reception station 1 b uses characteristic amounts of signals that are associated with the interfering stations (i.e., suppression target transmission sources) 2 a and 2 b and that have been measured in the past as characteristic amounts of interfering signals that are used to suppress the interfering signals from a received signal.

Receiver apparatus having filters implemented using frequency translation techniques

A method and apparatus is disclosed to effectively frequency translate a filter characterized as a low quality factor (Q) filter, corresponding to a baseband frequency of approximately zero Hertz or to an intermediate frequency (IF), to a filter characterized as a high Q filter at frequencies greater than the baseband frequency or the IF. A downconversion mixer frequency translates a communication signal to the baseband frequency or the IF using a first local oscillator signal to provide a downconverted communication signal. A filter corresponding to the baseband frequency or the IF filters the downconverted communication signal to provide a filtered communication signal. An upconversion mixer frequency translates a communication signal using a second local oscillator signal. The frequency translation by the upconversion mixer, in effect, translates the filter characterization from the low Q filter to the high Q filter at frequencies greater than the baseband frequency or the IF.

Device and Method for Cascading Filters of Different Materials

Some embodiments of the invention provide a filter having at least one first filter, each first filter being a band-reject type filter having a first set of filter parameters that are a function of a first material used to fabricate the at least one first filter, and at least one second filter, each second filter having a second set of filter parameters that are a function of a second material used to fabricate the at least one second filter, each second filter being one of a band-reject type filter and a band pass type filter. The at least one first filter and the at least one second filter are then cascaded together to form the filter. The cascaded filter has a new third set of filter parameters that are a function of both the first material and the second material. 120-. (canceled)21. A method of filtering a signal , comprising:providing a signal to an input of a first filter, wherein the first filter comprises a first material;filtering the signal using a first set of filter parameters of the first filter to produce an output of the first filter, wherein the first set of filter parameters of the first filter are a function the first material;providing the output of the first filter to a second filter coupled in series to the first filter, wherein the second filter comprises a second material; andfiltering the output of the first filter using a second set of filter parameters of the second filter to produce an output of the second filter, wherein the second set of filter parameters of the second filter are a function the second material;wherein the at least one first filter is coupled to the at least one second filter to form a composite filter having a set of composite filter parameters, the composite filter parameters comprising a temperature dependent frequency drift that is primarily governed by a temperature coefficient of one of the first material and the second material.22. The method of claim 21 , further comprising matching a point at which the first ...

Compensation Apparatus for Receiver Asymmetric Wide Passband Frequency Response with 25% Duty Cycle Passive Mixer

A receiver compensation method comprising receiving a radio frequency signal, amplifying the radio frequency signal, thereby producing an amplified signal, compensating the amplified signal, thereby producing a compensated signal, and mixing the compensated signal, thereby producing a mixed compensated signal, wherein the mixed compensated signal has a first gain difference between a positive differential from a center frequency and a negative differential from the center frequency and wherein the first gain differential is smaller than a second gain differential that would be obtained by mixing the amplified signal without compensating the amplified signal.

DEVICE FOR ELECTROMAGNETIC NOISE REDUCTION IN A HYBRID AUTOMOTIVE VEHICLE, ASSEMBLY AND ELECTROMAGNETIC NOISE REDUCTION PROCESS IN A HYBRID AUTOMOTIVE VEHICLE

Device for electromagnetic noise reduction in a hybrid automotive vehicle () comprising: 1. A device for electromagnetic noise reduction in a hybrid automotive vehicle , comprising:at least one sensor that measures a conducted noise generated by at least one noise source;a reducer that reduces a radiated noise, referred to as modified, on a signal of interest made noisy by the modified radiated noise, where the reducer includes a determiner that determines the noise corrected signal of interest from a noisy signal of interest, where the determiner includes an estimator that estimates the modified radiated noise from the conducted noise; anda selector that selects a frequency for receiving a radiofrequency signal.2. The device according to claim 1 , wherein the sensor includes a Rogowski type coil.3. The device according to claim 1 , wherein the estimator includes an adaptive filter.4. The device according to claim 1 , further comprising a converter that converts the noisy signal of interest or conducted noise measured in an analogue mode into a digital mode claim 1 , wherein the converter is arranged upstream of a determiner that determines the noise corrected signal of interest.5. (canceled)6. The device according to claim 1 , further comprising a mixer that mixes the noisy signal of interest claim 1 , the measured conducted noise or the noise corrected signal of interest with a conversion signal including a conversion frequency claim 1 , into a noisy intermediate signal of interest claim 1 , a measured conducted intermediate noise or a noise corrected intermediate signal of interest having a single intermediate frequency.7. The device according to claim 6 , in which the mixer and the selector are shared.8. An assembly comprising:at least one noise source that includes an energy converter and a DC-DC converter; andat least one noise reduction device, wherein the at least one noise reduction device comprising:at least one sensor that measures a conducted noise ...

APPARATUS AND METHOD FOR REDUCING RX CALIBRATION DELAY IN WIRELESS COMMUNICATION SYSTEM

An apparatus and a method for removing RX DC in a wireless communication system are provided. A receiver apparatus includes a local oscillator, a mixer for converting a received signal to a baseband signal using a frequency provided from the local oscillator, and a DC compensator, comprising an operational amplifier and a low pass filter, for compensating DC in an output signal of a frequency converter by adjusting a pass band size of the low pass filter.

Method and Apparatus of Transceiver Calibration Using Substrate Coupling

Transceiver calibration is a critical issue for proper transceiver operation. The transceiver comprises at least one RF transmit chain and one RF receive chain. A closed loop path is formed from the digital block, the RF transmit chain, the substrate coupling, the RF receive chain back to the digital block and is used to estimate and calibrate the transceiver parameters over the operating range of frequencies. The substrate coupling eliminates the need for the additional circuitry saving area, power, and performance. In place of the additional circuitry, the digital block which performs baseband operations can be reconfigured into a software or/and hardware mode to calibrate the transceiver. The digital block comprises a processor and memory and is coupled to the front end of the RF transmit chain and the tail end of the RF receive chain.

Distributed Collaborative Signaling in Full Duplex Wireless Transceivers

Two-way (full-duplex) wireless links in facilitating network management and improve network performance. Once aspect includes methods for network management using an overlaid network for control signaling. Another aspects include methods to facilitate practical realization and improve performance of some of the network information theoretic configurations, such as Space-Division Multiple Access (SDMA) in uplink and downlink, Interference Channel, and other forms of distributed collaborative signaling schemes. Another aspect includes methods to support cognitive wireless networks.

Signal Receiver with Group Delay and Amplitude Distortion Compensation

A signal receiver includes an antenna interface for receiving signals from an antenna, analog signal processing circuitry coupled to the antenna interface for processing the received signals to produce filtered signals, sampling circuitry to sample the filtered signals so as to produce digitized received signals, a digital compensator to receive the digitized received signals and compensate for non-uniform group delay and amplitude distortion introduced by the analog signal processing circuitry to produce compensated digitized received signals, and a digital processor to process the compensated digitized received signals so as to produce a result. 1. A signal receiver , comprising:an antenna interface for receiving signals from an antenna;analog signal processing circuitry coupled to the antenna interface for processing the received signals to produce filtered signals;sampling circuitry to sample the filtered signals so as to produce digitized received signals;a digital compensator to receive the digitized received signals and compensate for non-uniform group delay and amplitude distortion introduced by the analog signal processing circuitry to produce compensated digitized received signals; anda digital processor to process the compensated digitized received signals so as to produce a result.2. The signal receiver of claim 1 , wherein the digital compensator is configured to process the digitized received signals using a finite impulse response filter (FIR filter) with complex filter coefficients to compensate for non-uniform group delay and amplitude distortion introduced by at least the analog signal processing circuitry.3. The signal receiver of claim 2 , wherein the complex filter coefficients of the FIR filter correspond to residual phase differences between target phase values and phase values of corresponding frequency components of the digitized received signals and to amplitude ratios between one or more target amplitude values and amplitude values of ...

High Frequency Signal Receiver with Self-Calibrated Group Delay Compensation

A signal receiver includes an antenna interface for receiving signals from an antenna, analog signal processing circuitry coupled to the antenna interface for processing the received signals to produce filtered signals, sampling circuitry to sample the filtered signals so as to produce digitized received signals, a digital compensator to receive the digitized received signals and compensate for non-uniform group delay introduced by the analog signal processing circuitry to produce compensated digitized received signals, and a digital processor to process the compensated digitized received signals so as to produce a result. 1. A signal receiver , comprising:an antenna interface for receiving signals from an antenna;analog signal processing circuitry coupled to the antenna interface for processing the received signals to produce filtered signals;sampling circuitry to sample the filtered signals so as to produce digitized received signals;a digital compensator to receive the digitized received signals and compensate for non-uniform group delay introduced by the analog signal processing circuitry to produce compensated digitized received signals; anda digital processor to process the compensated digitized received signals so as to produce a result.2. The signal receiver of claim 1 , wherein the digital compensator is configured to process the digitized received signals using a finite impulse response filter (FIR filter) with complex filter coefficients to compensate for non-uniform group delay introduced by at least the analog signal processing circuitry.3. The signal receiver of claim 2 , wherein the complex filter coefficients of the FIR filter correspond to residual phase differences between target phase values and phase values of corresponding frequency components of the digitized received signals.4. The signal receiver of claim 1 , further comprising:a calibration signal generator, coupled to the antenna interface, to inject a calibration signal at the antenna ...

MULTI-USER DETECTION USING EQUALIZATION AND SUCCESSIVE INTERFERENCE CANCELLATION

A method and apparatus for multi-user detection is disclosed. A signal is received in a shared spectrum, and samples of the received signals are produced as a received vector. The received vector is segmented into vector segments. Each segment has a portion that overlaps with another segment and the overlapping portion includes at least one chip less than twice a channel impulse response length. For each vector segment, symbols are successively determined for communications by determining symbols for a communication in the communications, ordering the communications by received power and removing a contribution of the communication from the vector segment. The determining of symbols includes equalizing an input vector corresponding to a segment of the received vector using fast Fourier transform. The determined symbols are assembled into a data vector for each communication in the communications. 1. An integrated circuit (IC) , implemented in a wireless transmit/receive unit (WTRU) , the IC comprising:circuitry configured to receive a signal in a shared spectrum;circuitry configured to produce samples of the received signal as a received vector;circuitry configured to segment the received vector into a plurality of vector segments, wherein each segment has a portion overlapping with another segment and the overlapping portion includes at least one chip less than twice a channel impulse response length;circuitry configured to successively determine for each vector segment symbols for a plurality of communications by determining symbols for a communication in the plurality of communications, ordering the communications by received power and removing a contribution of the communication from the vector segment, wherein the circuitry is configured to determine the symbols by equalizing an input vector corresponding to a segment of the received vector using fast Fourier transform; andcircuitry configured to assemble the determined symbols into a data vector for each ...

Adaptive Interference Suppression Using Interference Power Measurements

Systems and methods are disclosed for interference suppression in a mobile device (MS). In certain embodiments, the MS uses handover measurements to detect and measure the interference powers of neighbor cells and sorts them with respect to their power levels. An RSRP ratio of serving cell RSRP to neighbor cell RSRP may be used to determine the interference power levels of the neighbor cells. Alternately, RSRQ may be used to determine the interference power levels of the neighbor cells. The MS may estimate the interference of each cell with an interference power level above a certain threshold and then subtract each interference estimate from the total received signal until all the selected interferers are suppressed. In certain embodiments, the interference suppressed signal may then be equalized and/or decoded. Equalization may occur during suppression of interference from individual neighbor cells or after all neighbor cell interference estimates have been subtracted. 1. A method for suppressing interference comprising:determining a signal power of a serving cell;determining an interference power of each of one or more neighbor cells;constructing an interference estimate for one or more of the neighbor cells;subtracting each of the interference estimates from a total received signal to generate an interference suppressed signal.2. The method of claim 1 , wherein the step of constructing an interference estimate is performed for each of the neighbor cells for which the ratio of signal power to interference power is greater than the threshold.3. The method of claim 1 , wherein the step of constructing an interference estimate is performed for each of the neighbor cells for which the ratio of signal power to interference power is less than the threshold.4. The method of claim 1 , further comprising equalizing the interference suppressed signal to generate an equalized signal.5. The method of claim 2 , further comprising decoding the equalized signal to generate a ...

TECHNIQUE FOR AUTOMATIC GAIN CONTROL

A technique for performing Automatic Gain Control for a receiver () of a device () connected to a communication system is provided. As for a method embodiment, a method () comprises the steps of receiving () a signal using a gain setting () of the receiver (); at least partially decoding () the received signal () to obtain a decoding result; and selecting () the gain setting based on the decoding result. 1. A method of performing Automatic Gain Control , AGC , for a receiver of a device connected to a communication system , the method comprising:receiving a signal using a gain setting of the receiver;at least partially decoding the received signal to obtain a decoding result; andselecting the gain setting based on the decoding result.2. The method of claim 1 , wherein the decoding result indicates at least one of success and failure of the decoding.3. The method of claim 2 , wherein selecting the gain setting comprises:updating the gain setting of the receiver in an absence of an interference in the received signal, the success of the decoding indicating the absence of the interference.4. The method of claim 2 , wherein selecting the gain setting comprises:maintaining the gain setting of the receiver in a presence of an interference in the received signal, the failure of the decoding indicating the presence of the interference.5. The method of claim 4 , wherein maintaining the gain setting includes at least one of:(a) a suppressed change of the gain setting, wherein the suppressed change is equal to or less than half of a conventional AGC response; and(b) a transient change of the gain setting, wherein the gain setting is continuously updated and returns to a prior gain setting in case the failure of the decoding indicates the presence of the interference.6. The method of claim 3 , further comprising:estimating a signal-to-noise ratio of the received signal, the signal-to-noise ratio further indicating at least one of a presence and an absence of the interference.7. ...

METHOD AND SYSTEM FOR UNCONSTRAINED FREQUENCY DOMAIN ADAPTIVE FILTERING

Aspects of a method and system for unconstrained frequency domain adaptive filtering include one or more circuits that are operable to select one or more time domain coefficients in a current filter partition. A value may be computed for each of the selected one or more time domain coefficients based on a corresponding plurality of frequency domain coefficients. The corresponding plurality of frequency domain coefficients may be adjusted based on the computed values. A subsequent plurality of frequency domain coefficients in a subsequent filter partition may be adjusted based on the computed values. Input signals may be processed in the current filter partition based on the adjusted corresponding plurality of frequency domain coefficients. A time-adjusted version of the input signals may be processed in a subsequent filter partition based on the adjusted subsequent plurality of frequency domain coefficients. 1. A communication device , comprising:a receiver configured to receive a radio frequency (RF) signal; andan adaptive filter configured to filter a portion of the RF signal based upon a plurality of frequency domain coefficients, where at least a portion of the plurality of frequency domain coefficients is adjusted based upon a computed value for a time domain coefficient in a filter partition based upon the plurality of frequency domain coefficients, where the time domain coefficient in the filter partition overlaps with a corresponding time domain coefficient in a time delayed filter partition, and where computing the computed value comprises adding a value for a first frequency domain coefficient of the plurality of frequency domain coefficients and a value for each even-numbered frequency domain coefficient of the plurality of frequency domain coefficients.2. The communication device of claim 1 , wherein computing the computed value comprises subtracting a value for each odd-numbered frequency domain coefficient of the plurality of frequency domain ...

WIRELESS COMMUNICATION DEVICE, WIRELESS COMMUNICATION METHOD, AND WIRELESS COMMUNICATION PROGRAM

A wireless communication device includes a demodulation unit which demodulates a predetermined reception frequency, an S/N improvement processing unit which performs an S/N improvement process on a demodulated signal output from the demodulation unit, a first filter which performs an adaptive operation with respect to a frequency having a largest amplitude in a signal output from the S/N improvement processing unit, and outputs a filter coefficient updated by the adaptive operation, a controller which calculates the frequency of the largest amplitude defined by the filter coefficient output from the first filter, and controls the demodulation unit to update the reception frequency so as to reduce a difference between the frequency having the largest amplitude and a predetermined frequency, and a second filter which limits a range of a frequency bandwidth of the demodulated signal based on the frequency having the largest amplitude. 1. A wireless communication device comprising:a demodulation unit which demodulates a predetermined reception frequency;an S/N improvement processing unit which performs an S/N improvement process on a demodulated signal output from the demodulation unit;a first filter which performs an adaptive operation with respect to a frequency having a largest amplitude in a signal output from the S/N improvement processing unit, and outputs a filter coefficient updated by the adaptive operation;a controller which calculates the frequency of the largest amplitude defined by the filter coefficient output from the first filter, and, on a basis of a difference between the frequency having the largest amplitude and a predetermined frequency, controls the demodulation unit to update the reception frequency so as to reduce the difference; anda second filter which limits a range of a frequency bandwidth of the demodulated signal on a basis of the frequency having the largest amplitude.2. The wireless communication device of claim 1 , wherein the second ...

Baseband Cancellation of Direct Sequence Spread Spectrum Platform Radio Interference

Briefly, in accordance with one or more embodiments, a platform may comprise a receiver to receive a signal that includes an error in the received signal due to a noise signal generated in the platform, and a processor configured to calculate a noise vector from a source of the noise signal. The noise vector may be de-spread. The receiver may include digital signal processing configured to estimate an error vector based at least in part on the noise vector and to subtract the estimated error vector from the received signal to cancel the noise signal from the received signal. The noise cancelled from the received signal may include platform noise generated by a bus, a memory circuit, a clock, a power supply, a circuit ground or integrated circuit substrate, or input/output circuit of the platform.

PROCESSING INTERFERENCE IN A WIRELESS NETWORK

Interference (I) in a waveform received at a device in a wireless network is processed, the processing, for example, being used to detect and/or reduce the interference. The interference comprises non-linear products of at least a first signal. On the basis of at least the first signal, a plurality of interference product streams are generated, each stream comprising a stream of time samples of a simulated non-linear product of at least the first signal. At least two of the plurality of interference product streams are processed to reduce a degree of correlation between said at least two interference product streams thereby producing at least two processed interference product streams, which are correlated with the received waveform to produce a plurality of respective correlation values. The interference is processed in dependence on the plurality of respective correlation values. 1. A method of processing interference in a waveform received at a device in a wireless network , the interference comprising non-linear products of at least a first signal , the method comprising:generating, on the basis of at least the first signal, a plurality of interference product streams, each interference product stream comprising a stream of time samples of a simulated non-linear product of at least the first signal;processing at least two of the plurality of interference product streams to reduce a degree of correlation between said at least two interference product streams thereby producing at least two processed interference product streams;correlating said at least two processed interference product streams with the received waveform to produce a respective correlation value; andprocessing the interference in dependence on the respective correlation values.2. The method of claim 1 , wherein said processing of the at least two of the plurality of interference product streams comprises:generating at least one processed interference product stream that is a linear combination of ...

SYSTEM FOR CANCELLING INTERFERENCE IN A FULL-DUPLEX WIRELINE COMMUNICATION LINK

The present invention relates to a system for cancelling interference in a full-duplex wireline communication link. The communication link has a transceiver at each end and configured to transmit a signal and receive a signal. The transceiver comprises: a self-interference (SI) canceller module configured to subtract self-interference of the signal transmitted by the transceiver from the signal received by the same transceiver in analog domain; and an echo canceller module configured to subtract reflected version of the signal transmitted by the transceiver from the signal received by the same transceiver in analog domain. 1. A system for cancelling interference in a full-duplex wireline communication link having a transceiver at each end of the communication link configured to transmit a signal and receive a signal , the transceiver comprising:a self-interference (SI) canceller module configured to subtract self-interference of the signal transmitted by the transceiver from the signal received by the same transceiver in analog domain; andan echo canceller module configured to subtract reflected version of the signal transmitted by the transceiver from the signal received by the same transceiver in analog domain.2. The system as claimed in claim 1 , wherein the SI canceller module comprises:a plurality of delay elements, each delay element configured to receive the signal transmitted by the transceiver and generate a delayed replica of the transmitted signal;a plurality of multipliers with adjustable weight coefficients, each of the multiplier configured to receive and amplify the delayed replica of the transmitted signal; anda summation circuit configured to subtract output of the multipliers from the signal received by the transceiver in analog domain.3. The system as claimed in claim 1 , wherein the echo canceller module comprises:a plurality of delay elements, each delay element configured to receive the signal transmitted by the transceiver and generate a ...

SYSTEMS AND METHODS FOR INTELLIGENTLY-TUNED DIGITAL SELF-INTERFERENCE CANCELLATION

A system for digital self-interference cancellation includes a filter that generates a reduced-noise digital residue signal; a channel estimator that generates a current self-interference channel estimate from a digital transmit signal, the reduced-noise digital residue signal, and past self-interference channel estimates; a controller that dynamically sets the digital transform configuration in response to changes in a controller-sampled digital residue signal; a predictor that modifies output of the channel estimator to compensate for a first time delay incurred in tuning the system for digital self-interference cancellation; and a channel memory that stores the past self-interference channel estimates. 2. The method of claim 1 , wherein generating the residue signal comprises combining the receive signal with the self-interference cancellation signal to generate the residue signal.3. The method of claim 1 , wherein:generating the predicted self-interference channel estimate is performed based further on a stored self-interference channel estimate; and at the predictor, receiving the stored self-interference channel estimate from a channel memory of the digital canceller; and', 'at the channel memory, updating the stored self-interference channel estimate based on an updated channel estimate, wherein the updated channel estimate comprises at least one of the self-interference channel estimate or the predicted self-interference channel estimate., 'generating the self-interference cancellation signal further comprises4. The method of claim 3 , wherein:a plurality of subcarriers consists of an active set and an inactive set;the stored self-interference channel estimate comprises a plurality of stored subcarrier estimates, wherein each stored subcarrier estimate of the plurality is associated with a different subcarrier of the plurality of subcarriers; andan iteration of updating the stored self-interference channel estimate comprises, for each subcarrier of the ...

RATE CONTROL FOR WIRELESS COMMUNICATION

Rate control is provided for communicating within a wireless communication network. In some examples, redundant packet information transmitted over separate links, each link having its own independent rate control loop, can result in improvement in packet reliability with fast convergence to a desired error level. In other examples, artificial degradation of a received data stream can be utilized to improve packet reliability, also with fast convergence to the desired error level. 1. An apparatus for wireless communication , comprising:at least one processor; anda memory coupled to the at least one processor, transmit a first packet stream on a first link;', 'transmit a second packet stream on a second link, the second packet stream comprising information that is redundant of information transmitted on the first packet stream;', 'implement rate control on the first link; and', 'implement rate control on the second link,', 'wherein the rate control on the first link is independent of the rate control on the second link and the rate control on the second link is independent of the rate control on the first link., 'wherein the at least one processor is configured to2. The apparatus of claim 1 , wherein the information that is redundant of information transmitted on the first packet stream comprises duplicate packets to packets transmitted on the first packet stream.3. The apparatus of claim 1 , wherein the information that is redundant of information transmitted on the first packet stream comprises parity information for the information transmitted on the first packet stream.4. The apparatus of claim 3 , wherein the at least one processor is further configured to:encode an initial packet stream; anddivide the encoded initial packet stream to generate the first packet stream and the second packet stream.5. The apparatus of claim 1 , wherein:the rate control on the first link comprises setting at least one rate control parameter of the first link in accordance with ...

RECEIVER, METHOD FOR CANCELLING INTERFERENCE THEREOF AND TRANSMITTER FOR THE SAME

A method and apparatus for receiving feedback information of a transmitter in a mobile communication system are provided. The method includes determining a parameter related to a first user signal; transmitting the first user signal based on the parameter related to the first user signal to a receiver; and receiving feedback information associated with the first user signal and an interference signal based on the first user signal. 1. A method for receiving feedback information of a transmitter in a mobile communication system , the method comprising:determining a parameter related to a first user signal;transmitting the first user signal based on the parameter related to the first user signal to a receiver; andreceiving feedback information associated with the first user signal and an interference signal based on the first user signal.2. The method of claim 1 , further comprising:transmitting a second user signal based on the received feedback information.3. The method of claim 1 , wherein the received feedback information is phase information of the first user signal and the interference signal.4. The method of claim 2 , further comprising rotating the second user signal such that a phase of the second user signal differs from a phase of the interference signal by 90° in a complex space.5. The method of claim 4 , wherein the second user signal and the interference signal are rotated claim 4 , by the receiver claim 4 , to eliminate the interference signal.6. A method for transmitting feedback information of a receiver in a mobile communication system claim 4 , the method comprising:receiving, from a transmitter, a first user signal based on a parameter related to the first signal determined by the transmitter;generating feedback information associated with the first user signal and an interference signal based on the first user signal; andtransmitting the generated feedback information to the transmitter.7. The method of claim 6 , further comprising:receiving a ...

Distributed collaborative signaling in full duplex wireless transceivers

Two-way (full-duplex) wireless links in facilitating network management and improve network performance. Once aspect includes methods for network management using a high-throughput channel and a low-throughput channel. Other aspects include methods to facilitate practical realization and improve performance of some of the network information theoretic configurations, such as Space-Division Multiple Access (SDMA) in uplink and downlink, Interference Channel, and other forms of distributed collaborative signaling schemes. Another aspect includes methods to support cognitive wireless networks.

SYSTEM AND METHOD FOR CANCELLING STRONG SIGNALS FROM COMBINED WEAK AND STRONG SIGNALS IN COMMUNICATIONS SYSTEMS

A receiver for cancelling strong signals from combined weak and strong signals includes: a first circuitry for inputting a weak and strong signal as an input; a parametric cancellation circuit for inputting a representation of the strong signal and an output of the first circuitry to produce a cancellation signal; a second circuitry electrically coupled to the parametric cancellation circuit for inputting the cancellation signal to produce a modulated output; a demodulator electronically coupled to the second circuitry for demodulating the modulated output to produce a demodulated output and an error signal, where the demodulated output is the data contained in the weak signal; and an adaptation logic circuit for inputting the representation of the strong signal, the demodulated output and the error signal to adaptively produce parameters for the parametric cancellation circuit. The parametric cancellation circuit further inputs the error signal and the parameters to produce the cancellation signal. 1. A receiver for cancelling strong signals from combined weak and strong signals comprising:a first circuitry for inputting a weak and strong signal as an input;a parametric cancellation circuit for inputting a representation of the strong signal and an output of the first circuitry to produce a cancellation signal;a second circuitry electrically coupled to the parametric cancellation circuit for inputting the cancellation signal to produce a modulated output;a demodulator electronically coupled to the second circuitry for demodulating the modulated output to produce a demodulated output and an error signal, wherein the demodulated output is the data contained in the weak signal; and 'the parametric cancellation circuit further inputs the error signal and the parameters to produce the cancellation signal.', 'an adaptation logic circuit for inputting the representation of the strong signal, the demodulated output and the error signal to adaptively produce parameters for ...

COMMUNICATION CIRCUIT AND SEMICONDUCTOR DEVICE

A communication circuit includes a receiver circuit that provides differential communication by using a first transmission path and a second transmission path. The first transmission path transmits a first signal. The second transmission path transmits a second signal. The receiver circuit includes a compensation circuit that compensates for the attenuation of a current when common mode noise is superimposed on the first signal and on the second signal. The compensation circuit includes a first compensation circuit. The first compensation circuit detects an electric current attenuation of the first signal when the common mode noise is superimposed thereon, and compensates for the attenuation thereof by adding the detected electric current attenuation to the second signal. 1. A communication circuit comprising:a receiver circuit that provides differential communication by using a first transmission path and a second transmission path, the first transmission path being used to transmit a first signal, the second transmission path being used to transmit a second signal, the second signal being in opposite phase to the first signal;wherein the receiver circuit includesa compensation circuit that compensates for an attenuation of a current when common mode noise is superimposed on the first signal and on the second signal,wherein the compensation circuit includesa first compensation circuit, andwherein the first compensation circuit detects an electric current attenuation of the first signal when the common mode noise is superimposed on the first signal, and compensates for the attenuation of the first signal by adding the detected electric current attenuation to the second signal.2. The communication circuit according to claim 1 , further comprising:a second compensation circuit,wherein the second compensation circuit detects an electric current attenuation of the second signal when the common mode noise is superimposed on the second signal, and compensates for the ...

WIRELESS COMMUNICATION WITH INTERFERENCE MITIGATION

In one implementation, a wireless communication terminal includes a primary antenna array and a first controller configured to steer a main beam of the primary antenna array in a desired direction. The wireless communication terminal also includes an auxiliary antenna array and a second controller configured to control complex weights to be applied by at least some antenna elements of the auxiliary antenna array to corresponding variants of a second signal received by the at least some auxiliary antenna elements. Furthermore, the wireless communication terminal includes at least one signal combiner configured to combine variants of the second signal received from auxiliary antenna elements into an interfering signal that models interference from a co-located wireless communication terminal and subtract the interfering signal from variants of the first signal received from antenna elements of the principal antenna array to produce an interference mitigated signal. 1. A satellite communication terminal for transmitting signals to and receiving signals from one or more satellites orbiting the earth , the satellite communication terminal comprising:a steerable primary antenna that includes an array of a first number of primary antenna elements, each primary antenna element having a band pass filter configured to pass frequencies of a signal received by the primary antenna element that are within a desired frequency band while attenuating frequencies that are outside of the desired frequency band, a low noise amplifier configured to amplify a signal received by the primary antenna element, a power amplifier configured to amplify a signal to be transmitted by the primary antenna element, a switch configured to switch the primary antenna element between operating in a transmit mode and a receive mode, and a phase shifter configured to apply weights to signals transmitted and received by the primary antenna element;an auxiliary antenna having an array of a second number of ...

DEVICE WITH VARIABLE FREQUENCY FILTER FOR REJECTING HARMONICS

The present disclosure generally relates to a device having a variable frequency filter that rejects harmonics generated by a variable reactance device. The variable frequency filter may be coupled to the antenna and the variable reactance device. The filter includes a variable capacitor and an inductor coupled together as a resonant circuit. The filter may be used in cellular technology to prevent harmonic frequencies that are created by another variable reactance device from reaching the antenna of the cellular device. Furthermore, the filter can reflect any receiving frequencies from the antenna and prevent the receiving frequencies from passing through. 1. A device , comprising:a first antenna;an RF source coupled to the first antenna;a variable reactance device coupled to the first antenna; anda first variable frequency filter coupled to the first antenna and the variable reactance device.2. The device of claim 1 , wherein the variable reactance device is a digital variable capacitor.3. The device of claim 2 , wherein the digital variable capacitor includes a plurality of MEMS devices claim 2 ,4. The device of claim 1 , wherein the variable reactance device comprises one or more switched inductors.5. The device of claim 1 , wherein the variable reactance device comprises one or more switched capacitors.6. The device of claim 1 , wherein the variable reactance device comprises one or more of the following:switched inductors;switched capacitors; andvariable capacitors.7. The device of claim 1 , wherein the first variable frequency filter comprises a first inductor and a first capacitor.8. The device of claim 7 , wherein the first inductor and the first capacitor are connected in parallel.9. The device of claim 8 , further comprising a second variable frequency filter coupled between the variable reactance device and the first antenna.10. The device of claim 9 , wherein the first variable frequency filter is connected between a first node and a second node and ...

Control node with an octagonal vector constellation for an array antenna

A control node for an array antenna configured so as to apply an attenuation and a phase shift to a radiofrequency signal on the basis of a control signal, to a beamforming network, to an array antenna and to a satellite includes the control node. It comprises a quadratic divider that delivers an in-phase signal and a quadrature signal on separate transmission channels, a combiner configured so as to sum the signals transmitted on two of the transmission channels, each transmission channel comprising at least: one attenuation cell activated on the basis of the value of a dedicated bit of the control signal, and one phase shift cell configured so as to apply a fixed phase shift, activated on the basis of the result of combinational logic implemented on bits of the control signal.

DUPLEXER WITH IMPEDANCE INVERTERS

A duplexer may be used to isolate a transmitter and a receiver that share a common antenna. By using impedance gradients to provide impedances that cause balance-unbalance transformers (balun) of the duplexer to cut-off access to the common antenna rather than duplicate the antenna impedance, the duplexer is balanced. Such cut-offs may have a lower insertion loss than a duplexer that merely duplicates the antenna impedance to separate the differential signals of the receiver and transmitter from the common mode signal. 120-. (canceled)21. An electronic device , comprising:a transmitter and a receiver;one or more antennas; and a transmitter impedance inverter, and', 'a receiver impedance inverter, the duplexer configured to couple the transmitter to the one or more antennas via the transmitter impedance inverter, couple the receiver to the one or more antennas via the receiver impedance inverter, or both., 'a duplexer comprising'}22. The electronic device of claim 21 , comprising a controller configured toreceive an indication to operate the duplexer for a transmit operation, the transmit operation being associated with transmitting an output signal through the transmitter to the one or more antennas,operate the receiver impedance inverter in a first impedance mode and operate the transmitter impedance inverter in a second impedance mode to couple the transmitter to the one or more antennas via the transmitter impedance inverter based on receiving the indication to operate the duplexer for the transmit operation, andoperate the transmitter to transmit the output signal via the duplexer during the transmit operation.23. The electronic device of claim 22 , whereinthe receiver impedance inverter operating in the first impedance mode is configured to have a greater impedance at an input to the receiver impedance inverter relative to an impedance at an output from the receiver impedance inverter, andthe transmitter impedance inverter operating in the second impedance mode ...

PIM CANCELLATION

An apparatus, method and computer program product is disclosed. The apparatus may comprise means for transmitting and receiving radio frequency signals using a radio system coupled to an external antenna via an additional combiner or diplexer, means for receiving one or more reference signals usable for measurement of passive intermodulation from one or more nodes provided in a signal path external to the radio system, a first one of said nodes being associated with a signal path between the additional combiner or diplexer and the external antenna, and means for performing passive intermodulation cancellation based on the received one or more reference signals, including a first reference signal from the first node. 1. Apparatus , comprising:a processor; anda memory including instructions, the instructions, when executed by the processor, cause the apparatus to:transmit and receive radio frequency signals using a radio system coupled to an external antenna via an additional combiner or diplexer;receive, on one or more dedicated signal paths or channels, one or more reference signals usable for measurement of passive intermodulation from one or more nodes provided in a signal path external to the radio system, a first one of said nodes being associated with a signal path between the additional combiner or diplexer and the external antenna; andperform passive intermodulation cancellation on the received radio frequency signals based on the received one or more reference signals, including a first reference signal from the first node.2. The apparatus of claim 1 , wherein the additional combiner or diplexer is coupled to one or more further radio systems for coupling said one or more further radio systems to the external antenna.3. The apparatus of claim 1 , wherein the received one or more reference signals are received via a first summing node which sums the first reference signal from the first node with one or more other reference signals from one or more further ...

TECHNIQUE FOR GENERATING A FILTER FOR DATA RECEPTION

A technique for generating a processing filter is provided. The processing filter allows for processing data that is received in a mobile communication network on multiple branches. A method embodiment of the technique includes the steps of determining a covariance of noise on the multiple branches and computing the processing filter based on the noise covariance. The computation includes a Cholesky decomposition of the noise covariance and a matrix inversion based on a result of the Cholesky decomposition, wherein the Cholesky decomposition uses a first numerical representation and the matrix inversion uses a second numerical representation that is more complex than the first numerical representation. 1. A method of generating a processing filter (F) for processing data received in a mobile communication network on multiple branches , the method comprising:determining a covariance (Λ) of noise on the multiple branches; andcomputing the processing filter (F) based on the noise covariance (Λ), wherein the computation includes a Cholesky decomposition of the noise covariance (Λ) and a matrix inversion based on a result of the Cholesky decomposition, wherein the Cholesky decomposition uses a first numerical representation and the matrix inversion uses a second numerical representation that is more complex than the first numerical representation.2. The method of claim 1 , wherein the first numerical representation of a real part and an imaginary part of a complex value includes one exponent common for both the real part and the imaginary part.3. The method of claim 1 , wherein the second numerical representation of a real part and an imaginary part of a complex value includes an exponent different for each of the real part and the imaginary part.4. The method of claim 1 , wherein the processing filter (F) includes a mixing filter (Y) adapted to mix signals received on different branches of the multiple branches receiver.5. The method of claim 4 , wherein the mixing ...

SYSTEMS AND METHODS FOR CANCELLATION OF PASSIVE INTERMODULATION (PIM) FOR A WIRELESS NETWORK RECEIVER

There is provided a passive intermodulation (PIM) mitigation module for mitigating PIM within a receiver of a wireless network, the PIM mitigation module comprising: at least one processor executing a code for: receiving transmit signals transmitted by at least one transmission source, receiving received signals received by at least one reception source, computing a plurality of synthetic PIM signals from the transmit signals, wherein each of the plurality of synthetic PIM signals is a respective combination of a plurality of frequency components of the transmit signals, computing a plurality of mitigation weights for mitigating the plurality of synthetic PIM signals, and performing a PIM mitigation process on the received signal with the plurality of mitigation weights to generate clean signals to provide to the receiver. 1. A passive intermodulation (PIM) mitigation module for mitigating PIM within a receiver of a wireless network , the PIM mitigation module comprising: receiving transmit signals transmitted by at least one transmission source;', 'receiving received signals received by at least one reception source;', 'computing a plurality of synthetic PIM signals from the transmit signals, wherein each of the plurality of synthetic PIM signals is a respective combination of a plurality of frequency components of the transmit signals;', 'computing a plurality of mitigation weights for mitigating the plurality of synthetic PIM signals; and', 'performing a PIM mitigation process on the received signal with the plurality of mitigation weights to generate clean signals to provide to the receiver., 'at least one processor executing a code for2. The PIM mitigation module of claim 1 , wherein the plurality of frequency components of the transmit signals used to generate the respective combination are predicted to produce a respective PIM signal in a corresponding frequency component of the received signals.3. The PIM mitigation module of claim 1 , wherein the plurality ...

WIRELESS DOCKING WITH CARRIER SENSE CONTROL

A wireless docking system in a shared radio spectrum environment includes a docking station () configured with a radio () connected to an antenna (), a dockee () configured with a radio () connected to an antenna () and using a radio standard with a carrier sense mechanism for communications with the docking station, and a system to reduce sensitivity of the carrier sense mechanism in at least one of the radio () of the dockee () and the radio () of the docking station (). 1. A docking station for wireless docking with a dockee in a shared radio spectrum environment using a radio standard with a carrier sensing mechanism for communications , the docking station comprising:a radio;an antenna connected to the radio, wherein the radio is configured to cause a modification of a carrier sensing mechanism detection threshold when a dockee is docked to be higher than that of a carrier sensing mechanism detection threshold when the dockee is undocked.2. The docking station according to claim 1 , further comprising a noise generator claim 1 , wherein the noise generator transmits signals thereby raising the noise floor of signals received in the dockee A to a level that masks radio transmissions in the radio environment other than radio transmissions from the docking station.3. The docking station according to claim 1 , wherein the antenna of the docking station is directional so that signals transmitted from the docking station are directed toward the dockee when docked.4. The docking station according to claim 1 , wherein the docking station is configured to provide transit power control (TPC) report to a dockee that implements TPC claim 1 , such that the docking station can provide feedback to the dockee for lowering the transmit power settings used by the dockee when docked.5. A docking station for wireless docking with a dockee in a shared radio spectrum environment using a radio standard with a carrier sensing mechanism for communication with the docking station claim ...

Systems and methods for adaptive averaging in frequency domain equalization systems

An example system comprises a first antenna and a modem. The first antenna is configured to receive a signal from a transmitting radio frequency unit. The signal includes data and a known sequence. The modem is configured to retrieve the known sequence from the signal, transform the known sequence and the data into a frequency domain, calculate averages of groups of neighboring frequency points in the frequency domain to reduce the effect of nonlinear noise in the signal, the neighboring frequency points corresponding to the preamble in the frequency domain, compare the calculated averages to an expected frequency response in the frequency domain, determine a correction filter to apply to the data based on the comparison, apply the correction filter on the data in the frequency domain to create corrected data, transform the corrected data from the frequency domain to the time domain, and provide the data.

Adaptive harmonic rejection receiving device and method

The invention provides an adaptive harmonic rejection (HR) receiving device, including a low noise amplification module; at least one HR mixer; at least one non-harmonic rejection (NHR) frequency mixer; and a control device. A received signal passes through the low noise amplification, and then passes through the at least one HR mixer or the at least one NHR mixer; the control device measures a receiving signal strength index (RSSI) after the received signal passes through the at least one HR mixer or the NHR mixer, and selects an NHR mixer or an appropriate HR mixer for the received signal according to a result of the measurement. The adaptive HR receiving device of the present invention is capable of adaptively judging whether to implement HR or determining which HR to implement according to features of the received signal, thereby improving the reception flexibility and reception performance.

SYSTEM AND METHOD FOR SIGNAL INTERFERENCE REJECTION USING HUMAN BODY COMMUNICATION

A communication interference rejection system comprising a receiver operatively connected to a device connected to a body of a user. The receiver is configured to receive a signal transmitted through the body of the user, the signal comprising a data component and an interference component, the interference component due to human body antenna effect. The receiver is configured to integrate the signal using a relatively low-gain analog integrator and then digitally differentiate the output of said integration. 1. A communication interference rejection system comprising:a receiver operatively connected to a device connected to a body of a user, the receiver configured to receive a signal transmitted through the body of the user, the signal comprising a data component and an interference component, said interference component due to human body antenna effect, said receiver comprising a relatively low-gain analog integrator and a differentiator, wherein the analog integrator integrates the signal and then the differentiator digitally differentiates the output of said integration.2. The system of claim 1 , wherein the receiver further comprises an analog to digital converter which is applied between the analog integrator and the differentiator claim 1 , wherein the differentiator comprises a digital differentiator.3. The system of claim 1 , wherein the signal is in the range of 100 KHz-1 MHz frequency band for Broadband Human Body Communication claim 1 , wherein communication is enabled only when the transmitter and the receiver are in direct contact with the user claim 1 , and wherein the signal frequency band is within 100 KHz-1 MHz.4. A communication interference rejection system comprising:a receiver operatively connected to a device connected to a body of a user, the receiver configured to receive a signal transmitted through the body of the user, the signal comprising a data component and an interference component, said interference component due to human body ...

RECEIVER NONLINEARITY ESTIMATION AND CANCELLATION

Systems and methods are provided for receiver nonlinearity estimation and cancellation. Narrowband (NB) estimation may be performed in a receiver during handling of received radio frequency (RF) signals. The narrowband (NB) may include generating estimation channelization information relating to received RF signals; generating reference nonlinearity information relating to one or more other signals, which may cause or contribute to nonlinearity that affects the processing of the received RF signals; and generating, based on the estimation channelization information relating to the received RF signals and the reference nonlinearity information relating to the other signals, control data for configuring nonlinearity cancellation functions. The received RF signals may be channelized, and the estimation channelization information may be generated based on the channelization of the received RF signals. The other signals may be channelized, and the reference nonlinearity information may be generated based on the channelization of the other signals. 1. A method for performing narrowband (NB) estimation , the method comprising:generating estimation channelization information relating to received RF signals;generating reference nonlinearity information relating to one or more other signals, wherein the one or more other signals cause or contribute to nonlinearity that affects processing of the received RF signals; andgenerating, based on the estimation channelization information relating to the received RF signals and the reference nonlinearity information relating to the one or more other signals, control data for configuring nonlinearity cancellation functions.2. The method of claim 1 , comprising:channelizing the received RF signals; andgenerating the estimation channelization information based on the channelization of the received RF signals.3. The method of claim 2 , comprising:extracting during the channelization of the received RF signals, one or more narrowband (NB) ...

Low Power Encoded Signal Detection

A method and receiver for detecting a signal wherein the signal is encoded the signal with a pair of spaced predetermined frequencies and wherein energy is detected in each of the pair of predetermined frequencies and in a predetermined frequency between the pair of predetermined frequencies. Energy detected in each of the pair of predetermined frequencies is compared with the energy detected in the predetermined frequency between the pair of predetermined frequencies. The detecting includes passing the encoded signal through narrow band filters, each one of the filters being tuned to a corresponding one of the pair of predetermined frequencies and the predetermined frequency between the pair of predetermined frequencies. 1. A receiver for detecting an encoded signal , having a pair of spaced predetermined frequencies , in the presence of unwanted signals having frequencies extending over the pair of spaced predetermined frequencies , the receiver comprising:three narrow band filters, a pair of the filters being tuned to the paired predetermined frequencies for receiving energy from the encoded signal and a third one of the filters being tuned to a third predetermined frequency between the pair of frequencies for receiving energy from a portion of the unwanted signals; anda detection section for indicating detection of the encoded signal as a function of the energy in the pair of filters tuned to the paired predetermined frequencies relative to the energy in the third one of the three filters, the energy in the third one of the three filters indicating a level of the unwanted signals having frequencies included over the pair of spaced predetermined frequencies.2. A receiver for detecting an encoded signal , having a pair of spaced predetermined frequencies , in the presence of unwanted signals having frequencies extending over the pair of spaced predetermined frequencies , the receiver comprising:three narrow band filters, a pair of the filters being tuned to a ...

CONTACTLESS COMMUNICATION UNIT CONNECTOR ASSEMBLIES WITH SIGNAL DIRECTING STRUCTURES

Contactless extremely high frequency (EHF) signal directing and blocking structures are disclosed herein. The EHF signal directing structures may focus EHF signal energy along a desired EHF signal pathway. The EHF signal blocking structures may minimize signal propagation through substrates such as circuit boards. Focusing EHF signal energy and selectively blocking the EHF signal energy can minimize or eliminate crosstalk and enhance data transmission speed and integrity. 148.-. (canceled)49. A contactless communications device , comprising:a substrate;a plurality of contactless communication units (CCUs) mounted to the substrate, each CCU comprising a transducer operative to selectively transmit and receive contactless signals to and/or from a counterpart CCU associated with a device other than the contactless communications device; andbeam directing structure coupled to the substrate and positioned adjacent to the CCUs such that the beam directing structure establishes signal-shaped pathways for the contactless signals being transceived for each CCU in a manner that reduces cross-talk among the CCUs and with counterpart CCUs associated with the device other than the contactless communications device.50. The contactless communications device of claim 49 , wherein the signal-shaped pathways enhance signal strength of the contactless signals being transmitted between the CCUs and their counterpart CCUs.51. The contactless communications device of claim 49 , wherein the beam directing structure comprises:a signal guiding structure that guides contactless signals along the signal-shaped pathways; anda signal blocking structure that blocks contactless signals from traveling along undesired paths.52. The contactless communications device of claim 51 , wherein the signal guiding structure is constructed from a dielectric material claim 51 , and wherein the signal blocking structure is constructed from at least one of a conductive or absorptive material.53. The contactless ...

METHOD AND APPARATUS FOR ADAPTIVELY SETTING THRESHOLD FOR SIGNAL DEMODULATION

Provided is a method and apparatus to adaptively set a threshold for signal demodulation. The apparatus and the method include adaptively setting a threshold to demodulate a currently received symbol based on the demodulation value of a previously received symbol based on a comparison value. The comparison value is obtained by comparing a number of previously received symbols having a demodulation value of “0” and a number of currently received symbols having a demodulation value of “1”. 1. A method , comprising:identifying a demodulation value of a previously received symbol received during a predetermined symbol period; andadaptively setting a threshold to demodulate a currently received symbol based on the demodulation value of the previously received symbol.2. The method of claim 1 , wherein the identifying comprises:obtaining a comparison value by comparing a number of previously received symbols having a demodulation value of “0” and a number of currently received symbols having a demodulation value of “1”.3. The method of claim 2 , wherein the obtaining comprises:setting a weighted value based on a distance between the currently received symbol and the previously received symbol; andcomparing the number of previously received symbols having the demodulation value of “0” and the number of currently received symbols having the demodulation value of “1” using the weighted value.4. The method of claim 1 , further comprising:alternately receiving a training symbol having a demodulation value of “0” and a training symbol having a demodulation value of “1” during a predetermined training period.5. The method of claim 4 , wherein the adaptively setting comprises:setting a fixed threshold using the training symbol having the demodulation value of “0” and the training symbol having the demodulation value of “1”; andsetting the fixed threshold to be an initial value of the threshold for demodulating the currently received symbol.6. The method of claim 4 , wherein the ...

SYSTEMS AND METHODS FOR ADAPTIVE AVERAGING IN FREQUENCY DOMAIN EQUALIZATION SYSTEMS

An example system comprises a first antenna and a modem. The first antenna is configured to receive a signal from a transmitting radio frequency unit. The signal includes data and a known sequence. The modem is configured to retrieve the known sequence from the signal, transform the known sequence and the data into a frequency domain, calculate averages of groups of neighboring frequency points in the frequency domain to reduce the effect of nonlinear noise in the signal, the neighboring frequency points corresponding to the preamble in the frequency domain, compare the calculated averages to an expected frequency response in the frequency domain, determine a correction filter to apply to the data based on the comparison, apply the correction filter on the data in the frequency domain to create corrected data, transform the corrected data from the frequency domain to the time domain, and provide the data. 1. A system comprising:an antenna configured to receive a signal from a transmitting radio frequency unit, the signal including data and a preamble containing bits for a known sequence of a predetermined length; and retrieve the preamble from the signal;', 'transform the preamble and the data from a time domain into a frequency domain, the transforming the preamble into the frequency domain causing generation of preamble-based frequency points in the frequency domain;', 'group neighboring frequency points of the preamble-based frequency points in the frequency domain to generate one or more groups of neighboring preamble-based frequency points, each group of neighboring preamble-based frequency points including a number of neighboring preamble-based frequency points, the number being based on an amount of error in the signal;', 'generate a representative point in the frequency domain for each group of neighboring preamble-based frequency points;', 'compare each representative point to an expected frequency response in the frequency domain, the expected frequency ...

DIRECT CONVERSION RECEIVER DEVICE WITH FIRST AND SECOND STAGES AND RELATED METHODS

A direct conversion receiver device may receive I and Q signals. The direct conversion receiver device may include a blind IQ balance circuit configured to balance the I and Q signals without a pilot signal, and a mixer coupled to the blind IQ balance circuit and configured to generate I and Q baseband signals using an operational frequency, the operational frequency being based upon bandwidth and modulation of the I and Q signals. The blind IQ balance circuit may include a first stage configured to generate an intermediate amplitude balanced Q signal based upon the I and Q signals, and a second stage coupled to the first stage and configured to generate phased balanced I and Q signals based upon the intermediate amplitude balanced Q signal and the I signal. 1. A direct conversion receiver device for receiving in-phase (I) and quadrature (Q) signals , the direct conversion receiver device comprising: a first stage configured to generate an intermediate amplitude balanced Q signal based upon the I and Q signals, and', 'a second stage coupled to said first stage and configured to generate phased balanced I and Q signals based upon the intermediate amplitude balanced Q signal and the I signal; and, 'a blind IQ balance circuit configured to balance the I and Q signals without a pilot signal comprising'}a mixer coupled to said blind IQ balance circuit and configured to generate I and Q baseband signals using an operational frequency, the operational frequency being based upon bandwidth and modulation of the I and Q signals.2. The direct conversion receiver device of wherein said first stage comprises first and second multipliers configured to respectively generate squares of the I and Q signals claim 1 , and first and second average circuits respectively coupled to said first and second multipliers.3. The direct conversion receiver device of wherein said first stage comprises a first divider circuit downstream from said first and second average circuits and configured to ...

Reconfigurable Feed-Forward for Electrical Balance Duplexers (EBD)

Systems, methods, and devices for reducing insertion loss and/or swapping transmitter (TX) and receiver (RX) frequencies in an electrical balance duplexer (EBD) used in a transceiver device for frequency division duplexing (FDD) applications are provided. Feed-forward receiver path from the antenna to a low noise amplifier (LNA) and a feed-forward path from the antenna to a power amplifier (PA) of the EBD may be used for reducing insertion loss of the RX and TX signals. In some embodiments, switches may be used to selectively alter operational modes for varied levels of isolation and/or swapping of TX and RX frequencies. 1. An electrical balance duplexer of a transceiver device , the electrical balance duplexer comprising:an antenna configured to send transmission signals and receive reception signals;a low noise amplifier configured to amplify the reception signals from the antenna;a power amplifier configured to amplify the transmission signals to the antenna;a hybrid transformer coupled to the low noise amplifier, the power amplifier, and the antenna, the hybrid transformer configured to isolate the reception signals from the transmission signals communicated simultaneously;a feed-forward receiver path connecting the antenna to the low noise amplifier; anda feed-forward transmitter path connecting the antenna to the power amplifier.2. The electrical balance duplexer of claim 1 , wherein the feed-forward receiver path and the feed-forward transmitter path are separate paths.3. The electrical balance duplexer of claim 1 , wherein the feed-forward receiver path passes the reception signals from the antenna without signal loss otherwise associated with the power amplifier claim 1 , a balancing impedance coupled to the hybrid transformer claim 1 , or a combination thereof.4. The electrical balance duplexer of claim 1 , wherein the feed-forward transmitter path is configured to mitigate signal loss associated with the low noise amplifier claim 1 , a balancing impedance ...

FM ANALOG DEMODULATOR COMPATIBLE WITH IBOC SIGNALS

A method includes: receiving an FM radio signal including an analog-modulated portion; digitally sampling an analog-modulated portion of the radio signal to produce a plurality of samples; using a ratio between an average magnitude and an RMS magnitude of a block of the samples to compute a signal quality metric; detecting sum and difference components of the baseband multiplex signal content; using the baseband content to produce an output signal; and blending the output signal from stereo to monaural as the signal quality metric falls below a threshold value. 1. A method comprising:receiving an FM radio signal including an analog-modulated portion;digitally sampling an analog-modulated portion of the radio signal to produce a plurality of samples;using a ratio between an average magnitude and an RMS magnitude of a block of the samples to compute a signal quality metric;detecting sum and difference components of the baseband multiplex signal content;using the baseband content to produce an output signal; andblending the output signal from stereo to monaural as the signal quality metric falls below a threshold value.2. The method of claim 1 , wherein blending the output signal to monaural is performed through reduction or elimination of a stereo difference signal.3. The method of claim 2 , wherein a stereo blend control signal weights the stereo difference signal by a value ranging from 0 to 1.4. The method of claim 3 , wherein a stereo metric value is determined using a pilot power signal and the signal quality metric.5. The method of claim 4 , wherein an in-phase component of the pilot signal is filtered claim 4 , the power of the filtered pilot signal is measured claim 4 , and then the pilot signal is filtered again to provide a measure of the pilot power claim 4 , having a normalized range from zero to approximately 1.6. The method of claim 3 , wherein the stereo blend control signal is formed as a function of both a filtered and unfiltered stereo metric signal. ...

SIGNAL RECEIVING CIRCUITS INCLUDING TERMINATION RESISTANCE HAVING ADJUSTABLE RESISTANCE VALUE, OPERATING METHODS THEREOF, AND STORAGE DEVICES THEREWITH

A receiving circuit includes a termination resistance circuit and a resistance adjustment circuit. The termination resistance circuit is configured to receive a first differential signal via a first input terminal and a second differential signal via a second input terminal, and to be selectively connected to the first and second input terminals. The termination resistance circuit has an adjustable resistance value. The resistance adjustment circuit is configured to decrease the resistance value of the termination resistance circuit in response to a signal reception preparation command and connection of the termination resistance circuit to the first and second input terminals. 1. A receiving circuit configured to receive a differential signal , the receiving circuit comprising:a termination resistance circuit connected between a first input terminal and a second input terminal, the termination resistance circuit having a resistance value that is adjustable between a first resistance value and a second resistance value, the second resistance value being less than the first resistance value;a switching circuit configured to control a connection between the termination resistance circuit and each of the first and second input terminals; anda resistance adjustment circuit configured to adjust the resistance value of the termination resistance circuit from the first resistance value to the second resistance value when the termination resistance circuit is disconnected from at least one of the first and second input terminals, and then connected to the first and second input terminals by the switching circuit.2. The receiving circuit of claim 1 , further comprising:the first and second input terminals configured to transmit the received differential signal.3. The receiving circuit of claim 1 , wherein the switching circuit is configured to connect the termination resistance circuit to the first and second input terminals in response to a signal reception preparation ...

Transmitter Receiver Leakage Reduction In A Full Duplex System Without The Use Of A Duplexer

A transceiver suitable for frequency duplex division communication is disclosed. The transceiver comprises a transmitter, wherein the transmitter comprises a power amplifier; a receiver; an auxiliary power amplifier which is arranged to provide a controllable phase shift and gain output; a first filter arranged at an output of the power amplifier arranged to attenuate frequencies at a receiving frequency of the receiver; a second filter arrangement at an output of the auxiliary power amplifier arranged to attenuate frequencies at a receiving frequency of the receiver; and a signal transmission arrangement. The signal transmission arrangement is arranged to transmit signals provided from the transmitter through its power amplifier to a radio frequency, RF, connecting point, receive signals from the RF connecting point and provide the signals to the receiver, and provide signals from the auxiliary amplifier towards an input of the receiver. The transceiver also comprises a controller, wherein the controller is arranged to control the auxiliary power amplifier output to provide a signal that has a phase and amplitude in relation to the output of the power amplifier of the transmitter such that the transmitter contribution to the signal at the input of the receiver is suppressed. A method of controlling the transceiver, a communication device and computer program are also disclosed. 151-. (canceled)52. A transceiver suitable for frequency duplex division communication , the transceiver comprising:a transmitter, the transmitter comprising a power amplifier;a receiver;an auxiliary power amplifier configured to provide a controllable phase shift and gain output;a first filter arranged at an output of the power amplifier and configured to attenuate frequencies at a receiving frequency of the receiver;a second filter at an output of the auxiliary power amplifier and configured to attenuate frequencies at a receiving frequency of the receiver; transmit signals provided from ...

FILTER CIRCUIT IN WIRELESS RECEIVER

A filter circuit for generating a filtered signal includes a first filter unit, a second filter unit, and a negative feedback resistor. The first filter unit includes a signal input unit that receives signals, a signal output unit that outputs the filtered signals, and a non-ideal integrator and a first ideal integrator that are connected in series between the signal input unit and the signal output unit. The second filter unit includes an ideal integrator that is negative feedback-connected to the non-ideal integrator or the first ideal integrator. The negative feedback resistor is connected between the signal output unit and the signal input unit of the first filter unit. 1. A filter circuit for generating a filtered signal , comprising: a signal input unit that receives signals,', 'a signal output unit that outputs the filtered signals,', 'a non-ideal integrator and a first ideal integrator that are connected in series between the signal input unit and the signal output unit;, 'a first filter unit including'}a second filter unit including an ideal integrator that is negative feedback-connected to the non-ideal integrator or the first ideal integrator; anda negative feedback resistor that is connected between the signal output unit and the signal input unit of the first filter unit.2. The filter circuit as set forth in claim 1 , wherein:the non-ideal integrator includes an operational amplifier;the first ideal integrator includes a first operational amplifier;the ideal integrator of the second filter unit is a second ideal integrator that is negative feedback-connected between an output terminal and an input terminal of the operational amplifier of the non-ideal integrator, andthe second filter unit further includes a third ideal integrator that is negative feedback-connected between an output terminal and an input terminal of the first operational amplifier of the first ideal integrator.3. The filter circuit as set forth in claim 2 , wherein:the non-ideal ...

Interference Cancellation in Microwave Backhaul Systems

A first microwave backhaul assembly comprises a first antenna, a front-end circuit, an inter-backhaul-assembly interface circuit, and an interference cancellation circuit. The first antenna is operable to receive a first microwave signal. The front-end circuit is operable to convert the first microwave signal to a lower-frequency digital signal, wherein the lower-frequency digital signal has energy of a second microwave signal and energy of a third microwave signal. The inter-backhaul-assembly interface circuit is operable to receive information from a second microwave backhaul assembly. The interference cancellation circuit is operable to use the information received via the inter-backhaul-assembly interface circuit during processing of the lower-frequency digital signal to remove, from the first microwave signal, the energy of the third microwave signal. The information received via the inter-backhaul-assembly interface may comprise a signal having energy of the second microwave signal. 1. A system comprising:a first receiver operable to output a digital signal comprising a desired signal with interference;an interface operable to receive information from a second receiver; andan interference cancellation circuit operable to use the information received via the interface to reduce the interference.2. The system of claim 1 , wherein the information received via the interface comprises a signal having energy at the frequency of the desired signal.3. The system of claim 1 , wherein the information received via the interface comprises a signal having energy at the frequency of the interference.4. The system of claim 1 , wherein the information received via the interface comprises an indication of an amount of energy of the interference received by the second receiver.5. The system of claim 1 , wherein:the desired signal is destined for the first receiver; andthe interference is related to a signal destined for the second receiver.6. The system of claim 1 , wherein one ...

FAST FILTERING FOR A TRANSCEIVER

Techniques for fast filtering for a transceiver are presented. A multidimensional filter processor component (MDFPC) can perform configurations and adaptations of multiple digital filters of a transceiver. The MDFPC can treat multiple, separate filters of a transceiver as a single larger multidimensional filter, and jointly update the multiple filters in a single adaptation operation instead of performing multiple adaptation operations on multiple filters. To facilitate multidimensional filter adaptation, the MDFPC can manage respective cross-correlations associated with the inputs of the filters. The MDFPC can facilitate multidimensional filter adaptation by performing multidimensional filter adaptation in the frequency domain, wherein the adaptation can be performed in parallel for multiple frequency sub-channels. For each frequency sub-channel, the MDFPC can perform a filter adaptation, wherein respective filter adaptation matrices can be generated for respective frequency sub-channels to perform the update to facilitate managing different cross-correlations associated with different frequency sub-channels. 1. A system , comprising:a first filter component and a second filter component for filtering signals associated with a communication component; anda filter processor component for determining a cross-coupled correlation structure associated with a cross-correlation between respective inputs of the first filter component and the second filter component, and for determining an inverse cross-coupled correlation structure that corresponds to an inverse of the cross-coupled correlation structure to facilitate joint adaptation of the first filter component and the second filter component, wherein the filter processor component determines the inverse cross-coupled correlation structure comprising:a first inverse cross-coupled correlation sub-structure based at least in part on a first cross-coupled correlation sub-structure associated with the first first-filter ...

Phase-Noise Cancellation Apparatus and Method

A noise cancellation method comprises receiving, by an adaptive phase-noise cancellation apparatus, a noise-corrupted symbol from a receiver, performing a hard decision process on the noise-corrupted symbol to generate a substantially clean symbol based upon the noise-corrupted symbol, calculating a phase deviation of the noise-corrupted symbol based upon the substantially clean symbol and the noise-corrupted symbol, generating a phase error based upon the phase deviation and transmitting, at an output of the adaptive phase-noise cancellation apparatus, a phase corrected symbol determined in accordance with a subtraction of the generated phase error from the received noise-corrupted symbol.

WIDEBAND INTERFERENCE MITIGATION SYSTEM WITH NEGATIVE GROUP DELAY AND METHOD FOR WIDEBAND INTERFERENCE CANCELLATION

Embodiments of a wideband interference mitigation (IM) system with negative group delay (NGD) compensation and method for wideband interference cancellation are generally described herein. In some embodiments, the wideband IM system may include first frequency-selective circuitry to capture interfering signals within a bandwidth of interest from a primary signal path after removal of a desired signal, cancellation circuitry to implement a negative group delay (NGD) on output signals from the first frequency-selective circuitry to generate negative group-delayed signals, and second frequency-selective circuitry to generate interference cancellation signals from the negative group-delayed signals for combining with signals from the primary signal path. The negative group delay provided by the cancellation circuitry may compensate for a group delay of the first frequency-selective circuitry, a group delay of the second frequency-selective circuitry and a group delay of primary signal path so that the interference cancellation signals have little or no group delay with respect to signals of the primary signal path within the bandwidth of interest. 1. A wideband interference-mitigation (IM) system comprising:circuitry to implement a negative group delay (NGD) on interfering signals in an auxiliary signal path that are extracted from a primary signal path after removal of a desired signal; andcircuitry to generate interference cancellation signals from the negative group-delayed signals for combining with signals of the primary signal path,wherein the negative group delay is to compensate for a group delay of the auxiliary signal path to minimize any group delay that the interference cancellation signals have with respect to signals of the primary signal path within a bandwidth of interest.2. The wideband IM system of wherein the primary signal path comprises RF signals received directly from an antenna without prior amplification by a low noise amplifier (LNA) claim 1 , ...

METHOD AND APPARATUS FOR REDUCED SIZE RF FILTER

A radio frequency (RF) unit and a method for RF isolation. The RF unit includes first and second RF couplers, an RF filter, and an RF canceler connected in parallel with the RF filter. The first RF coupler is configured to receive an input signal. The RF filter is configured to receive a first portion of the input signal from the first RF coupler and attenuate frequencies outside of a passband of the RF filter from the first portion of the input signal. The RF canceler is configured to receive a second portion of the input signal from the first RF coupler and generate a cancellation signal from the second portion of the input signal based on a target frequency band of the RF canceler. The second RF coupler is configured to combine the cancellation signal with an output of the RF filter to generate an output signal.

Method and system for mitigating interference in the near field

Aspects of the subject disclosure may include, for example, receiving, via an antenna, a communication signal generated by a communication device, and detecting interference in the communication signal, wherein the interference is generated by one or more interference sources, wherein the interference is detected by monitoring a near field region of the antenna, an intermediate field region of the antenna, a far field region of the antenna, or any combinations thereof, wherein the monitoring excludes monitoring only the far field region of the antenna. Other embodiments are disclosed.

Method and system for polarization adjusting in time-division duplexing (tdd) or frequency-division duplexing (fdd)

Aspects of the subject disclosure may include, for example, performing, by an adjusting mechanism associated with a communications system, polarization adjusting for an uplink of the communications system, and performing, by the adjusting mechanism, polarization adjusting for a downlink of the communications system, wherein a first polarization of the uplink and a second polarization of the downlink are different. Other embodiments are disclosed.

Method and system for polarization adjusting of orthogonally-polarized element pairs

Aspects of the subject disclosure may include, for example, obtaining data regarding interference detected in a received communication signal, and performing polarization adjusting for one or more orthogonally-polarized element pairs of an antenna system such that an impact of the interference on the antenna system is minimized. Other embodiments are disclosed.

RADAR DETECTION FOR ADJACENT SEGMENTS IN WIRELESS COMMUNICATIONS

A method and apparatus are disclosed for searching for a radar signal within signals received by a wireless device. The wireless device may receive signals within a first frequency segment and a second frequency segment, which is adjacent to the first frequency segment. The wireless device may determine Fast Fourier Transform (FFT) bins associated with the first frequency segment and the second frequency segment. The wireless device may combine the FFT bins associated with the first frequency segment and the second frequency segment and may search for the radar signal within the combined FFT bins. 1. A method for searching for a radar signal by a wireless device , the method comprising:receiving signals, at the wireless device, within a first frequency segment and a second frequency segment, wherein the second frequency segment is adjacent to the first frequency segment;determining a first set of Fast Fourier Transform (FFT) bins associated with the first frequency segment;determining a second set of FFT bins associated with the second frequency segment;combining the first set of FFT bins and the second set of FFT bins to determine a combined FFT output that spans the first frequency segment and the second frequency segment; andsearching for the radar signal based, at least in part, on the combined FFT output.2. The method of claim 1 , further comprising:determining a first energy amount associated with signals received within the first frequency segment;determining a second energy amount associated with signals received within the second frequency segment; andcombining the first energy amount and the second energy amount to determine a combined energy amount that spans the first frequency segment and the second frequency segment,wherein searching for the radar signal is based, at least in part, on the combined energy amount.3. The method of claim 1 , wherein determining the first set of FFT bins and the second set of FFT bins is triggered by a strong signal event.4 ...

SELF-INTERFERENCE SIGNAL CANCELLATION DEVICE AND METHOD

A self-interference signal cancellation device and method are disclosed. A power divider divides a signal source into two paths, with one being connected to a transmit antenna and the other being connected to an input end of a self-interference signal reconstruction circuit. An output end of the self-interference signal reconstruction circuit is connected to a first input end of a combiner. An output end of a receive antenna is connected to a second input end of the combiner and a feedback regulating end of the self-interference signal reconstruction circuit, respectively. The transmit antenna and the receive antenna are arranged at different positions. According to the self-interference signal cancellation device of the present invention, by means of polarization isolation and separate arrangement between the transmit antenna and the receive antenna, high isolation between the antennas can be achieved, thereby reducing requirements for simulation elimination. 1. A self-interference signal cancellation device , comprising:a transmit antenna;a combiner;a self-interference signal reconstruction circuit, an output end of which is connected to a first input end of the combiner;a power divider, dividing a signal source into two paths, with one being connected to the transmit antenna and the other being connected to an input end of the self-interference signal reconstruction circuit; anda receive antenna, an output end of which is connected to a second input end of the combiner and a feedback regulating end of the self-interference signal reconstruction circuit, respectively;wherein, the transmit antenna and the receive antenna are arranged at different positions.2. The cancellation device according to claim 1 , wherein the self-interference signal reconstruction circuit comprises:an adaptive power phase controller;a phase shifter, an output end of which is connected to an input end of the combiner and a first input end of the adaptive power phase controller, respectively ...

Wideband Beamformer System

An adaptive phased-array processing solution, referred to as the Wideband Beamformer System (WBS), demonstrates an improvement in the range and quality of air link surveillance downlink wireless cell radio signals. The WBS applies wideband frequency-domain adaptive beamforming to preprocess the dense RF signal environment, minimizing co-channel interference (CCI) from each signal, and then reconstructing a “clean” version of the signal for input to the existing surveillance receiver(s). 1. A process for synthesizing an individual antenna beam pattern to each individual cellular transmitter within a predetermined cellular band to a receiving antenna to optimize signal-to-noise (SNR) of emitted transmitter signals therefrom comprising:scanning a predetermined cellular band and constructing a database of individual cellular transmitters emitting signals at or above the predetermined threshold;electronically steering a high gain antenna beam main lobe at each individual cellular transmitter emitting a signal at or above a predetermined threshold; andsimultaneously directing antenna nulls in the direction of individual cellular transmitters interfering with each of the other individual cellular transmitters within the predetermined cellular band.2. The process according to claim 1 , further comprising:isolating by a wideband adaptive beamformer each of the emitted transmitter signals and beam forming each of the emitted transmitter signals to attenuate co-channel interference from one or more neighboring signals; andreconstructing each of the emitted transmitter signals in a format for processing by one or more receivers.3. The process according to claim 2 , wherein each of the reconstructed emitted transmitter signals has a signal to noise ratio of greater than or equal to approximately 7.0 dB.4. The process according to claim 1 , wherein scanning the predetermined cellular band is performed periodically and the database of individual cellular transmitters emitting ...

APPARATUS AND METHOD FOR INTERFERENCE CANCELLATION IN COMMUNICATION SYSTEMS

A system that incorporates the subject disclosure may include, for example, determining an interference based on a channel gain for each signal of a group of signals received at a receiver from a group of transmitters. A determination is made as to whether the interference satisfies a threshold range of an analog-to-digital converter of the receiver for each of the group of transmitters. An analog time domain cancellation is performed responsive to a determination that the interference does not satisfy the threshold range, and a digital time domain cancellation is performed responsive to a determination that the interference satisfies the threshold range. Other embodiments are disclosed. 1. A method , comprising:determining, by a system comprising a processor, an interference associated with a group of signals received at a receiver from a group of transmitters, wherein the receiver is operably coupled with an antenna system including multiple antennas that enable full duplex operation; anddetermining, by the system, whether the interference satisfies a threshold range of an analog-to-digital converter of the receiver for each of the group of transmitters,wherein an analog time domain cancellation is performed responsive to a determination that the interference does not satisfy the threshold range.2. The method of claim 1 , wherein the threshold range of the analog-to-digital converter comprises a dynamic range claim 1 , and wherein a digital time domain cancellation is performed responsive to a determination that the interference satisfies the threshold range.3. The method of claim 2 , wherein a signal from each of the group of transmitters includes a first set of training symbols that facilitate the digital time domain cancellation and a second set of training symbols that facilitate the analog time domain cancellation.4. The method of claim 3 , wherein a second frequency of the receiver receiving the second set of training symbols for the analog time domain ...

RECEPTION SIGNAL PROCESSING DEVICE, RADAR, AND OBJECT DETECTION METHOD

A signal processing device according to an embodiment includes a plurality of signal processing units and a pseudo signal generating unit. The plurality of signal processing units are provided in a plurality of reception antennas which receive reflection signals of a transmission signal reflected on an object, and perform signal processing in parallel on beat signals which are generated based on the transmission signal and the reflections signals. The pseudo signal generating unit generates a pseudo signal imitating the beat signal, and inputs the pseudo signal as a target of the signal processing into the plurality of signal processing units in parallel. 1. A reception signal processing device comprising:a plurality of signal processing units provided in a plurality of reception antennas receiving reflection signals of a transmission signal reflected on an object, and that perform signal processing in parallel on beat signals based on the transmission signal and the reflection signals; anda pseudo signal generating unit that generates a pseudo signal imitating the beat signal, and inputs the pseudo signal as a target of the signal processing into the plurality of signal processing units in parallel.2. The reception signal processing device according to claim 1 ,wherein the pseudo signal generating unit generates a plurality of types of the pseudo signals having different frequencies.3. The reception signal processing device according to claim 1 ,wherein the pseudo signal generating unit generates the pseudo signal of any one of a rectangular wave, a triangular wave, a sawtooth wave, and a sinusoidal wave.4. The reception signal processing device according to claim 1 ,wherein the pseudo signal generating unit generates the pseudo signal using a clock signal as an original signal.5. The reception signal processing device according to claim 1 ,wherein the signal processing unit includes a variable gain amplifier which amplifies an input signal, andwherein the pseudo ...

FILTERING ARCHITECTURES AND METHODS FOR WIRELESS APPLICATIONS

Filtering architectures and methods for wireless applications. In some embodiments, a wireless architecture can include a pre-amplifier filter configured to filter a signal, and an amplifier assembly configured to amplify the filtered signal. The wireless architecture can further include a filter circuit configured to provide selective filtering of the amplified signal based at least in part on a rejection level of the pre-amplifier filter and a gain of the amplifier assembly. In some embodiments, such a wireless architecture can be implemented in a packaged module or a wireless device. 1. A wireless architecture comprising:a pre-amplifier filter configured to filter a signal;an amplifier assembly configured to amplify the filtered signal; anda filter circuit configured to provide selective filtering of the amplified signal based at least in part on a rejection level of the pre-amplifier filter and a gain of the amplifier assembly.2. The wireless architecture of wherein the signal is a received signal claim 1 , and the amplifier assembly includes a low-noise amplifier.3. The wireless architecture of further comprising an antenna node implemented between the pre-amplifier filter and an antenna.4. (canceled)5. The wireless architecture of wherein the pre-amplifier filter is a band-pass filter.612. The wireless architecture of wherein the rejection level of the pre-amplifier band-pass filter has an absolute value of approximately G claim 5 , and the gain of the amplifier assembly has an absolute value of approximately G.721. The wireless architecture of wherein the filter circuit includes a band-pass filter having a pass-band that is substantially the same as a pass-band of the pre-amplifier band-pass filter claim 6 , and a rejection level with an absolute value of a difference between G and G.8. The wireless architecture of wherein the filter circuit includes a notch filter configured to further reject a selected out-of-band portion of the amplified signal.9. ( ...

Near Field Communications (NFC) Device Having Adjustable Gain

A near field communications (NFC) device is disclosed that is capable of optimizing a gain for received signals. Measurements are made of signals received from an NFC environment and are compared to one or more threshold hold values. Based on the comparison, it is determined whether the measurements indicate underamplification or overamplification. Depending on the results of the analysis, one or more components within the NFC device is adjusted to increase or decrease the gain, respectively. The measurements may be taken during an unloaded baseline state or during loading, and may be compared to previous measurements to estimate their accuracy.

METHOD AND APPARATUS FOR REDUCING FM AUDIO ARTIFACTS IN A RECEIVER

An apparatus and method for reducing FM audio artifacts in a receiver are provided. A direct conversion radio frequency (RF) receiver converts an analog FM signal into a phase shifted digital low IF signal. A digital controller coupled to the analog FM receiver provides adaptive frequency translation for different channel spacing and provides adaptive low IF configuration through the different channel spacing, thereby suppressing audio artifacts. 1. A radio receiver , comprising:an antenna for receiving a frequency modulated (FM) signal separated from other signals by a channel spacing;a radio frequency (RF) filter for filtering the FM signal into a filtered signal;a low noise amplifier (LNA) for amplifying the filtered signal into an amplified signal;a local oscillator for digitally generating first and second LO injection signals which are phase offset, the first and second LO injection signals also being frequency shifted based on the channel spacing;an analog quadrature mixer for generating low IF I/Q signals in response to the amplified signal being mixed with the frequency shifted LO injection signals;{'sub': 'LIF', 'a first path for processing the low IF I signal through a low pass filter, an analog-to-digital converter and a digital filter to generate a low IF digital signal (I);'}{'sub': 'LIF', 'a second path for processing the low IF Q signal through a low pass filter, an analog-to-digital converter and a digital filter to generate a low IF digital signal (Q);'}{'sub': LIF', 'LIF, 'an adaptive frequency translator for adaptively frequency offsetting the low IF digital signal (I) and low IF digital signal (Q) into a baseband signal without amplitude and phase imbalance by{'sub': 'LIF', 'applying, to the low IF digital signal (I), a first predetermined frequency offset for 12.5 kHz channel spacing, applying a second predetermined frequency offset for 20 kHz channel spacing and by applying a third predetermined frequency offset for 25 kHz channel spacing; and ...

SYSTEM AND METHOD FOR A FREQUENCY SELECTIVE RECEIVER

A receiver comprising a signal phase shifting block generating concurrent phase shifted copies of an input signal, and an impedance translation function block configured to receive the phase shifted copies of the input signal and generate a down converted signal wherein the impedance translation function block is driven by a single clock signal of frequency determined by a desired carrier frequency. The receiver including an energy harvesting block coupled to the phase shifting block to receive one or more in-band or out-of-band interferers in the input signal and reflected signals from the impedance translation function block due to nonlinearities. 1. A wireless signal receiver comprising:a signal phase shifting block generating concurrent phase shifted copies of an input signal; andan impedance translation function block configured to receive the phase shifted copies of the input signal and generate a down converted signal.2. The receiver of claim 1 , wherein the impedance translation function block is driven by a single clock signal of frequency determined by a desired carrier frequency.3. The receiver of claim 2 , wherein the clock signal is generated by a clock source of single frequency.4. The receiver of claim 1 , wherein the impedance translation function block includes pairs of switches operable in complimentary anti-phase mode.5. The receiver of claim 1 , wherein the down converted signals at the outputs of impedance translation function blocks are an IF or baseband signals.6. The receiver of claim 1 , wherein the phase shifted copies are distributed uniformly in phase from 0 degrees to 360 degrees.7. The receiver of claim 1 , including a signal processing block configured to receive the down converted signals from the impedance translation blocks and generate an output baseband signal.8. The receiver of claim 1 , including one or more energy harvesting blocks coupled to the phase shifting block to receive one or more in-band or out-of-band interferers in ...

DISCRETE TIME CANCELLATION FOR PROVIDING COEXSITENCE IN RADIO FREQUENCY COMMUNICATION SYSTEMS

Radio frequency (RF) communication systems with coexistence management are provided herein. In certain embodiments, a method of coexistence management in a mobile device includes processing an RF receive signal to generate a digital baseband receive signal using a receive channel of a first transceiver, processing a first RF observation signal to generate a first digital observation signal using a first observation channel of the first transceiver, generating spectral regrowth observation data based on processing process the first digital observation signal using a first spectral regrowth baseband sampling circuit of the first transceiver, and compensating the digital baseband receive signal for RF signal leakage based on the spectral regrowth observation data and on direct transmit leakage observation data using a discrete time cancellation circuit of the first transceiver. 1. A mobile device comprising:a first front end system configured to output a radio frequency receive signal and a first radio frequency observation signal; anda first transceiver including a receive channel configured to process the radio frequency receive signal to generate a first digital baseband receive signal, a first observation channel configured to process the first radio frequency observation signal to generate a first digital observation signal, a first spectral regrowth baseband sampling circuit configured to process the first digital observation signal to generate spectral regrowth observation data, and a discrete time cancellation circuit configured to compensate the first digital baseband receive signal for radio frequency signal leakage based on the spectral regrowth observation data and on direct transmit leakage observation data.2. The mobile device of further comprising a second transceiver configured to provide the direct transmit leakage observation data to the first transceiver.3. The mobile device of wherein the second transceiver includes a second observation channel ...

HIGH-SPEED SIGNALING SYSTEMS AND METHODS WITH ADAPTABLE, CONTINUOUS-TIME EQUALIZATION

A receiver includes a continuous-time equalizer, a decision-feedback equalizer (DFE), data and error sampling logic, and an adaptation engine. The receiver corrects for inter-symbol interference (ISI) associated with the most recent data symbol (first post cursor ISI) by establishing appropriate equalization settings for the continuous-time equalizer based upon a measure of the first-post-cursor ISI. 1. An integrated-circuit receiver to receive a series of symbols over a communication channel , the receiver comprising:a differential input port to receive a differential signal representing a series of symbols, the input port including a pair of pads;termination elements coupled to the pads to terminate the differential signal;continuous-time gain-control and equalization circuitry coupled to the pads, the circuitry to control gain and equalize a frequency range encompassing interference from a most-recently received symbol in the series of symbols;a decision-feedback equalizer coupled to the gain-control and equalization circuitry, the equalizer to equalize a frequency range only encompassing interference from arising from symbols other than the most-recently received symbol in the series;a data sampler to produce data samples from an equalized signal representing equalization by the gain-control and equalization circuitry and the decision-feedback equalizer; andan adaptation engine to generate a gain control value to adjust the gain provided by the gain-control and equalization circuitry and an equalization-control value to adjust a low-frequency gain of the gain-control and equalization circuitry relative to a high-frequency gain of the gain-control and equalization circuitry.2. The receiver of claim 1 , the adaptation engine to separately control the low-frequency gain and the high-frequency gain.3. The receiver of claim 1 , wherein the gain-control and equalization circuitry is AC coupled to the pads.4. The receiver of claim 1 , the adaptation engine including a ...

SYMBOL RATE ESTIMATING DEVICE AND METHOD AND ADJACENT CHANNEL INTERFERENCE DETECTING DEVICE

A symbol rate estimating device includes: a power spectrum density (PSD) estimating unit, estimating a PSD of an input signal; an index searching unit, searching for a cut-off frequency index in the PSD; an adjacent channel interference (ACI) detecting unit, detecting whether the input signal has ACI to generate a detection signal; a threshold adjusting unit, generating an adjusted index number threshold according to the detection signal; an index output unit, outputting the cut-off frequency index according to the adjusted index number threshold; and a symbol calculating unit, calculating a symbol rate of the input signal according to the cut-off frequency index. 1. A symbol rate estimating device , comprising hardware circuits and configured to:estimate a power spectrum density (PSD) of an input signal, wherein the PSD comprises a plurality of frequency indices respectively corresponding to a plurality of powers;search for a cut-off frequency index in the PSD;detect adjacent channel interference (ACI) in the input signal to generate a detection signal;generate an adjusted index number threshold according to the detection signal indicating that the input signal has ACI;output the cut-off frequency index according to the adjusted index number threshold; andcalculate a symbol rate of the input signal according to the cut-off frequency index.2. The symbol rate estimating device according to claim 1 , further configured to adjust the index number threshold by decreasing the index number threshold.3. The symbol rate estimating device according to claim 1 ,further configured to accumulate an index number of frequency indices, subsequent to the cut-off frequency index, corresponding to powers greater than a cut-off power;check whether the index number is equal to a predetermined index number threshold; andoutput the detection signal indicating that the input signal has ACI when the index number is equal to the predetermined index number threshold.4. The symbol rate ...

On-chip linearity calibration

An apparatus including: at least one receiver having injection points and having at least an amplifier and a transformer; and a plurality of isolation switches coupled to injection points of the at least one receiver, the plurality of isolation switches configured to route a calibration signal generated by a transmitter to one of the injection points.

RECEIVING APPARATUS AND SIGNAL PROCESSING METHOD THEREOF

A receiving apparatus is provided. The receiving apparatus may include a receiver, a PN sequence remover, and a zero padding performing unit. The receiver may be configured to receive a frame signal. The PN sequence remover may be configured to remove a first PN sequence from a first frame detected from the frame signal corresponding to a first path to generate a PN removed first frame and remove a second PN sequence from a second frame detected from the frame signal corresponding to a second path to generate a PN removed second frame. The zero padding performing unit may be configured zero pad the first PN removed frame to a size of a discrete Fourier transform (DFT) and zero pad the PN removed second frame to the size of the DFT. 1. A receiving apparatus , comprising:a receiver configured to receive a frame signal;a pseudo noise (PN) sequence remover configured to remove a first PN sequence from a first frame detected from the frame signal corresponding to a first path to generate a PN removed first frame and remove a second PN sequence from a second frame detected from the frame signal corresponding to a second path to generate a PN removed second frame; anda zero padding performing unit configured to zero pad the first PN removed frame to a size of a discrete Fourier transform (DFT) and zero pad the PN removed second frame to the size of the discrete DFT.2. The apparatus as claimed in claim 1 , wherein the zero padding performing unit is further configured to divide each of the first PN removed frame and the second PN removed frame into a plurality of predetermined time units based on a starting point of a data area of the first frame claim 1 , and zero pad each of the divided time units.3. The apparatus as claimed in claim 1 , further comprising a data recovery unit configured to recover data from the first PN removed frame and the second PN removed frame after the zero padding is performed.4. The apparatus as claimed in claim 3 , wherein the data recovery unit ...

Method and apparatus for the cancellation of intermodulation and harmonic distortion in a baseband receiver

A method ( 600 ) and apparatus ( 200 ) cancel odd-order distortion signals. Desensitization can be determined ( 610 ) in a received signal caused by odd-order harmonic distortion occurring from at least one transmit signal. A baseband replica harmonic distortion signal can be generated ( 620 ) using the transmit signal. The baseband replica harmonic distortion signal can be converted ( 630 ) to a low frequency harmonic distortion signal. The low frequency harmonic distortion signal can be subtracted ( 640 ) from the received signal to cancel the odd-order distortion from the received signal to create a corrected signal.

INTERFERENCE MITIGATION

A method is disclosed of a wireless receiver configured for spatial selective reception. The method is for mitigation of an interfering signal leaked into a frequency range of a desired signal due to non-linearity of hardware components of the receiver. 1. A method performed by a wireless receiver for mitigation of an interfering signal leaked into a frequency range of a desired signal due to non-linearity of hardware components of the receiver , the method comprising:receiving a composite signal comprising the desired signal and the interfering signal;filtering the composite signal using a spatial filter for a channel response of the desired signal to provide a first intermediate signal component;filtering the composite signal using a spatial filter for a channel response of the interfering signal to provide a second intermediate signal component;estimating a squared amplitude of the interfering signal based on the second intermediate signal component and a model of the non-linearity; andestimating the desired signal based on the first intermediate signal component, the estimated squared amplitude of the interfering signal, and the model of the non-linearity.2. The method of claim 1 , wherein the model of the non-linearity is a polynomial function wherein each term consists of the product of a coefficient claim 1 , an input variable claim 1 , and a squared absolute value of the input variable.3. The method of claim 1 , wherein estimating the squared amplitude of the interfering signal comprises:approximating an expression for the second intermediate signal component by two or more of its leading terms, wherein the expression for the second intermediate signal component is determined by the model of the non-linearity; andsolving an equation for the squared amplitude of the interfering signal, wherein the equation for the squared amplitude of the interfering signal is formed by the second intermediate signal component and the approximated expression for the second ...

WAKE-UP RECEIVER WITH AUTOMATIC INTERFERENCE REJECTION

A low power radio is provided with automatic interference rejection. The radio is comprised generally of: an antenna, a rectifier, a comparator, and a correlator. The comparator receives an input signal from the rectifier, compares the input signal to a reference signal and outputs a digital signal. The correlator in turn receives the digital signal from the comparator, correlates the digital signal to a wake-up code and outputs a wake-up signal having a high value when the digital signal is highly correlated with the wake-up code. The radio further includes an automatic threshold controller which adjusts sensitivity of the comparator. Of note, the rectifier, the comparator, the correlator and the automatic threshold controller are comprised in part by circuits having transistors operating only in subthreshold region. 1. A low power radio , comprising:an antenna configured to receive an RF signal;a rectifier configured to receive the RF signal from the antenna and generate a rectified input signal;a comparator configured to receive the input signal from the rectifier, the comparator compares the input signal to a reference signal and outputs a digital signal; anda correlator comprised in part by digital circuits having transistors operating in subthreshold region, the correlator configured to receive the digital signal from the comparator, correlate the digital signal to a wake-up code and output a wake-up signal, the wake-up signal having a high value when correlation between the digital signal and the wake-up code exceeds a correlation threshold and a low value when correlation between the digital signal and the wake-up code is less than a correlation threshold.2. The low power radio of wherein the rectifier is comprised in part by circuits having transistors operating only in subthreshold region.3. The low power radio of wherein the rectifier is further defined as a Dickson Multiplier circuit.4. The low power radio of wherein comparator is comprised in part by ...

WIRELESS COMMUNICATION DEVICE

A wireless communication device is provided. The wireless communication device includes a first wireless communication protocol transceiver, a second wireless communication protocol transceiver, a signal frequency splitter and a signal filter. The first wireless communication protocol transceiver accesses data with a first wireless communication protocol. The signal frequency splitter splits a receiving signal received by a second antenna and a transmitting signal transmitted by the second antenna according to a receiving frequency band and a transmitting frequency band of a second wireless communication protocol. The signal filter coupled to the signal frequency splitter and a receiving terminal of the second wireless communication protocol transceiver filters a signal in a receiving frequency band of the first wireless communication protocol and the receiving frequency band of the second wireless communication protocol. 1. A wireless communication device , comprising:a first wireless communication protocol transceiver, transmitting data through a first wireless communication protocol;a second wireless communication protocol transceiver, having a receiving terminal;a signal frequency splitter, splitting a receiving signal received by a second antenna and a transmitting signal transmitted by the second antenna according to a receiving frequency band and a transmitting frequency band of a second wireless communication protocol; anda signal filter, coupled to the signal frequency splitter and the receiving terminal of the second wireless communication protocol transceiver, and filtering a signal in a receiving frequency band of the first wireless communication protocol and the receiving frequency band of the second wireless communication protocol.2. The wireless communication device as claimed in claim 1 , wherein the second wireless communication protocol transceiver further comprises a transmitting terminal claim 1 , and the wireless communication device further ...

Adjusting application parameters for interference mitigation

Aspects of adjusting application parameters for interference mitigation are disclosed. In one aspect, a computing device is provided that employs a control system configured to detect and mitigate electromagnetic interference (EMI) generated within the computing device. More specifically, the control system is configured to detect possible EMI conditions and adjust parameters within the computing device to mitigate such EMI. In this manner, the computing device includes an aggressor application and a victim receiver. The control system is configured to analyze performance tradeoffs based on an acceptable performance level of the aggressor application and the performance degradation experienced by the victim receiver. Based on such analysis, the control system is configured to adjust parameters associated with the aggressor application to mitigate the EMI. Thus, the control system provides designers with an additional tool that may reduce the performance degradation of the victim receiver attributable to the EMI.

Analog-to-digital converter with bandpass noise transfer function

Methods and apparatus for providing bandpass analog to digital conversion (ADC) in RF receiver circuitry of a wireless-communication device. The bandpass ADC includes first noise-shaping successive approximation register (NS-SAR) circuitry arranged in a first path and second NS-SAR circuitry arranged in a second path parallel to the first path, wherein the first and second NS-SAR circuitries are configured to alternately sample an analog input voltage at a particular sampling rate and to output a digital voltage at the particular sampling rate.

Priority arbitration for interference mitigation

Aspects of priority arbitration for interference mitigation are disclosed. In one aspect, a computing device is provided that employs a control system configured to arbitrate the activity of multiple interfaces. This arbitration mitigates potential electromagnetic interference (EMI) that may degrade the performance of the computing device. Upon a first interface requesting to become active, the control system is configured to determine if a second interface is currently active. If so, the control system is configured to arbitrate the activity of the first interface and the second interface to mitigate the potential EMI generated if the interfaces are concurrently active. The computing device includes an aggressor controller and a victim receiver, each corresponding to a particular interface. The control system is configured to arbitrate such activity so that the aggressor controller and corresponding cable do not generate EMI during a time period that would degrade the performance of the victim receiver.

Reconfigurable Feed-Forward for Electrical Balance Duplexers (EBD)

Systems, methods, and devices for reducing insertion loss and/or swapping transmitter (TX) and receiver (RX) frequencies in an electrical balance duplexer (EBD) used in a transceiver device for frequency division duplexing (FDD) applications are provided. Feed-forward receiver path from the antenna to a low noise amplifier (LNA) and a feed-forward path from the antenna to a power amplifier (PA) of the EBD may be used for reducing insertion loss of the RX and TX signals. In some embodiments, switches may be used to selectively alter operational modes for varied levels of isolation and/or swapping of TX and RX frequencies. 1. An electronic device comprising: an antenna;', 'a low noise amplifier for amplification of received signals from the antenna;', 'a power amplifier for amplification of transmission signals to the antenna; and', 'an electrical balance duplexer circuit for isolating the received signals from simultaneously transmitted transmission signals;, 'a transceiver configured to receive and transmit communications signals in duplex, the transceiver comprisinga feed-forward receiver path connecting the antenna to the low noise amplifier;a feed-forward transmitter path connecting the antenna to the power amplifier; andwherein the feed-forward receiver path and the feed-forward transmitter path mitigate insertion loss caused by isolation functionality of the electrical balance duplexer.2. The electronic device of claim 1 , wherein the electrical balance duplexer comprises a plurality of switches that are selectively enabled to perform different operational modes of the electrical balance duplexer.3. The electronic device of claim 2 , comprising a receiver frequency filter and a transmitter frequency filter; a first switch on the feed-forward receiver path, selectively coupling to ground or coupling the antenna and the receiver frequency filter;', 'a second switch on the feed-forward transmitter path, selectively coupling to ground or coupling the antenna to the ...

Peak and gain calibration of a receiver in an isolation product

A method for calibrating a receiver of an isolator product includes adjusting a peaking frequency of a receiver signal path of a first integrated circuit die of the isolator product and a gain of the receiver signal path based on a predetermined peaking frequency, a predetermined gain, a first level of a diagnostic signal during a first interval, and a second level of the diagnostic signal during a second interval. The first interval and the second interval are non-overlapping intervals. The method may include receiving a calibration signal on a differential pair of nodes of the receiver signal path of the first integrated circuit die. The method may include generating a diagnostic signal corresponding to an average amplitude of a received version of the calibration signal.

MEASUREMENT AND CALIBRATION OF MISMATCH IN AN ISOLATION CHANNEL

A method for calibrating an isolator product includes receiving a calibration signal on a differential pair of nodes of a receiver signal path of a first integrated circuit die of the isolator product. The method includes generating a diagnostic signal having a level corresponding to an average amplitude of the calibration signal on the differential pair of nodes. The method includes configuring a programmable receiver signal path based on the diagnostic signal. Generating the diagnostic signal may include providing an analog signal based on a full-wave rectified version of the calibration signal on the differential pair of nodes. Generating the diagnostic signal may include converting the analog signal to a digital signal. 1. A method for calibrating an isolator product , the method comprising:receiving a calibration signal on a differential pair of nodes of a receiver signal path of a first integrated circuit die of the isolator product;generating a diagnostic signal having a level corresponding to an average amplitude of the calibration signal on the differential pair of nodes; andconfiguring a programmable receiver signal path based on the diagnostic signal.2. The method claim 1 , as recited in claim 1 , wherein generating the diagnostic signal comprises:providing an analog signal based on a full-wave rectified version of the calibration signal on the differential pair of nodes; andconverting the analog signal to a digital signal.3. The method claim 2 , as recited in claim 2 , wherein the analog signal has a linear relationship to a root mean square proportional function of the full-wave rectified version of the calibration signal on the differential pair of nodes.4. The method claim 1 , as recited in claim 1 , further comprising:reconfiguring the programmable receiver signal path based on an updated level of the diagnostic signal until a value of the diagnostic signal is less than or equal to a predetermined threshold level.5. The method claim 4 , as recited in ...

MEASUREMENT CIRCUIT FOR ISOLATION PRODUCT

A method includes generating a first current through a first node based on a differential pair of signals received by a differential pair of input nodes of a differential circuit of a first integrated circuit die of an isolator product. The method includes generating a second current through a second node. The second current matches the first current through the first node and is based on an attenuated version of an output measurement signal. The method includes generating the output measurement signal having a level corresponding to an average amplitude of the differential pair of signals based on the first current and the second current. 1. A method comprising:generating a first current through a first node based on a differential pair of signals received by a differential pair of input nodes of a differential circuit of a first integrated circuit die of an isolator product;generating a second current through a second node, the second current matching the first current through the first node and being based on an attenuated version of an output measurement signal; andgenerating the output measurement signal having a level corresponding to an average amplitude of the differential pair of signals based on the first current and the second current.2. The method claim 1 , as recited in claim 1 , wherein the output measurement signal has a linear relationship to a root mean square proportional function of a full-wave rectified version of the differential pair of signals.3. The method claim 2 , as recited in claim 2 , wherein a gain of the linear relationship is determined based on attenuation in a feedback circuit used to generate the attenuated version of the output measurement signal.4. The method claim 1 , as recited in claim 1 ,wherein generating the first current comprises detecting a lesser signal of a first signal of the differential pair of signals and a second signal of the differential pair of signals, enabling a corresponding branch of the differential ...

Low-noise tia-to-adc interface with a wide-range of passive gain control

A circuit for a low-noise interface between an amplifier and an analog-to-digital converter (ADC) may comprise a capacitor element having a capacitance of C coupled between a first and second output node of the amplifier. A first resistor R 1 may be coupled in parallel with the capacitor. A second resistor R 2 may be coupled between the first output node of the amplifier and a first input node of the ADC. A third resistor R 3 may be coupled between the second output node of the amplifier and a second input node of the ADC. Initial values of the resistances R 1, R 2, and R 3 may be selected to provide a desired value R L for a load resistance of the amplifier. A value of the capacitance C may be selected so that, in combination with the desired value R L , a desired bandwidth for the amplifier is achieved.

Interference Mitigation Based on Antenna System Phase Distribution

A method of interference mitigation may include receiving a desired signal from an asset of the system at an antenna assembly and associating the desired signal with relative phase distribution information based on a relative location of origin of the desired signal where the relative phase distribution information is predetermined for the antenna assembly. The method further includes receiving an interfering signal and associating the interfering signal with relative phase distribution information based on a relative location of origin of the interfering signal where the desired signal and the interfering signal forming a received signal set. The method further includes normalizing signals of the received signal set to respective relative phases associated with each respective relative location of origin, and performing interference cancellation of the interfering signal based on the normalized signals. 1. A method for interference mitigation in a wireless communication system , the method comprising:receiving a desired signal from an asset of the system at an antenna assembly;associating the desired signal with relative phase distribution information based on a relative location of origin of the desired signal, the relative phase distribution information being predetermined for the antenna assembly;receiving an interfering signal;associating the interfering signal with relative phase distribution information based on a relative location of origin of the interfering signal, the desired signal and the interfering signal forming a received signal set;normalizing signals of the received signal set to respective relative phases associated with each respective relative location of origin; andperforming interference cancellation of the interfering signal based on the normalized signals.2. The method of claim 1 , wherein performing interference cancellation comprises inverting normalized signals not from the relative location of origin of the desired signal and adding the ...

TRANSMIT ENERGY LEAKAGE CONTROL IN A RECEIVER

Systems and methods are provided for removing interference from received signals. An interference control signal may be generated in a transceiver during transmission and reception of signals. The interference control signal may be generated based on a first interference control input corresponding to an input signal used in generating the transmitted signals, and a second interference control input corresponding to a model of a leakage of the transmitted signals onto the received signals. The model may be based on a first approximation of a transfer function for the leakage. The interference control signal may be combined with an intermediate signal generated during processing of the received signals, to generate a corresponding combined signal, and the combined signal may be applied during processing of the received signals. 117-. (canceled)18. A system , comprising: a transmit section;', 'a receive section; and', [ a first interference control input corresponding to an input signal to the transmit section for transmission;', 'a second interference control input corresponding to a model of a leakage between the transmit section and receive section, wherein the model is based on a first approximation of a transfer function for the leakage;, 'generate an interference control signal based on, 'combine the interference control signal with an intermediate signal provided from the receive section to generate a corresponding combined signal, wherein the intermediate signal is generated in the receive section during processing of received signals; and', 'output the combined signal to the receive section for use in completing processing of the received signals., 'an interference control section that is operable to], 'transceiver circuitry that comprises19. The system of claim 18 , wherein the interference control section is operable to set and/or adjust characteristics of the generated interference control signal based on one or more control signals applied to the transmit ...

Systems and Methods for Analog Cancellation for Division Free Duplexing for Radios Using MIMO

System and method embodiments are provided for analog cancellation for division free duplexing for radios using MIMO. In an embodiment, a system for minimizing transmitted signals from a transmitter appearing at a co-located receiver in a division free duplexing radio includes a transmitter to transmit an analog transmitted signal; an antenna; a circulator coupled to the transmitter and the antenna; a tuning algorithm component configured to receive a copy of the analog transmitted signal from the transmitter and a sampled analog received signal from a received signal path from the circulator, wherein the sampled analog received signal is sampled at a point in the received signal path before the analog received signal is provided to a receiver; and a multitap cancellation component configured to provide a cancellation signal to couple to the analog received signal such that an amount of the analog transmitted signal appearing at the receiver is reduced.

RECEIVER AND TRANSMITTER OF COPING WITH INTERFERENCE IN SUPER-REGENERATIVE COMMUNICATION SYSTEM, AND METHOD OF USING THE RECEIVER AND THE TRANSMITTER

A receiver and a transmitter that copes with interference in a super-regenerative communication system, and a method of using the receiver and the transmitter, are provided. A super-regenerative receiver includes a resonance frequency adjusting unit configured to adjust a resonance frequency associated with a filtering band of a transmission signal that is received from a transmitter. The super-regenerative receiver further includes an oscillation signal generating unit configured to generate an oscillation signal, using a positive feedback amplification, based on the resonance frequency and the transmission signal. The super-regenerative receiver further includes an oscillation characteristic detecting unit configured to detect a characteristic of the oscillation signal. The super-regenerative receiver further includes a determining unit configured to determine whether interference is included in the transmission signal based on the characteristic of the oscillation signal and the resonance frequency. 1. A regenerative receiver comprising:an adjuster configured to adjust a resonance frequency associated with a filtering band of a transmission signal that is received from a transmitter;a generater configured to generate an oscillation signal based on the resonance frequency and the transmission signal;a detecter configured to detect a characteristic of the oscillation signal; anda determiner configured to determine whether interference is included in the transmission signal based on the characteristic of the oscillation signal and the resonance frequency.2. The regenerative receiver of claim 1 , further comprising at least one of:a controller configured to control the adjuster to adjust the resonance frequency based on a determination result of the determiner; anda transmitter configured to transmit, to the transmitter, a control signal associated with a characteristic of the transmission signal based on a determination result of the determiner.3. The regenerative ...

Radio Receiver Having Enhanced Automatic Gain Control Circuitry

An apparatus includes an input terminal to receive a radio frequency (RF) signal and to communicate the RF signal to a low noise amplifier (LNA) via an input signal path, and a capacitor attenuator coupled to the input terminal to attenuate the RF signal by a controllable amount and having a first portion controllable to include a used part configured on the input signal path and an unused part coupled between the input signal path and an AC reference node, and a second portion coupled between the LNA and the AC reference node. 1. A system comprising:an antenna to receive a radio frequency (RF) signal; and an input signal path to communicate the RF signal;', 'a low noise amplifier (LNA) coupled to receive the RF signal via the input signal path and to amplify the RF signal;', 'a capacitor attenuator coupled between the first pin, the LNA, and a second pin and having a controllable capacitance to attenuate the RF signal;', 'a detection circuit including a detector to detect a zero crossing of the RF signal; and', 'a controller to update a capacitance of the capacitor attenuator and to cause a digital signal processor (DSP) to compensate for the update to the capacitance, responsive to the zero crossing., 'a receiver coupled to the antenna to receive the RF signal via a first pin, the receiver including2. The system of claim 1 , wherein the capacitor attenuator comprises a first capacitor array controllable claim 1 , responsive to a strength of the RF signal claim 1 , to have a first portion coupled between the first pin and the LNA and a second portion coupled between the first pin and the second pin coupled to an external reference node claim 1 , and a second capacitor coupled between the LNA and the external reference node.3. The system of claim 2 , further comprising a first resistor attenuator coupled to the first pin to attenuate low frequency noise claim 2 , the first resistor attenuator controllable by the controller based on detection of the low frequency ...

Multi-carrier base station receiver

Embodiments of the present invention may provide a receiver. The receiver may include an RF section, a local oscillation signal generator to generate quadrature local oscillation signals, and a quadrature mixture, coupled to the RF section, to downconvert a first group of wireless signals directly to baseband frequency quadrature signals and to downconvert a second group of wireless signals to intermediate frequency quadrature signals. The receiver may also include a pair of analog-to-digital converters (ADCs) to convert the downconverted quadrature signals to corresponding digital quadrature signals. Further, the receiver may include a digital section having two paths to perform signal processing on the digital baseband frequency quadrature signals and to downconvert the digital intermediate frequency signals to baseband cancelling a third order harmonic distortion therein. Moreover, the receiver may include a phase corrector to adjust a phase of one of the local oscillation signals to balance the third order harmonic distortion and a gain offset generator to adjust a gain of one of the downconverted signals to balance the third order harmonic distortion.

APPARATUS AND METHOD FOR SELF-TESTING A COMPONENT FOR SIGNAL RECOVERY

A circuit having a component for signal recovery, such as an adaptive equalizer, may be tested in order to ensure that the component operates properly. Unfortunately, external test equipment may be expensive and prone to being damaged. According to an aspect of the disclosure, there is provided a circuit including BIST (Built-in Self-Test) circuitry for testing a component for signal recovery with a stress signal that simulates an imperfect signal received over a communication channel. The circuit also has a detector for determining whether the component is operating properly with the stress signal. Thus, no external test equipment is needed for testing the component. In some implementations, the BIST circuitry includes a low-pass filter for filtering a transmit signal into the stress signal. Thus, the amount of circuitry involved in generating the stress signal can be reduced. 1. A method comprising:providing a receive signal to receive circuitry using a multiplexer when the receive signal has been selected;performing signal recovery using a component of the receive circuitry;generating, using BIST (Built-in Self-Test) circuitry, a stress signal that simulates an imperfect signal received over a communication channel;providing the stress signal to the receive circuitry using the multiplexer when the stress signal has been selected in order to test the component; anddetermining, using a detector, at least one condition indicative of whether the component is operating properly with the stress signal.2. The method of claim 1 , further comprising:generating a transmit signal using transmit circuitry;wherein generating the stress signal comprises the BIST circuitry transforming the transmit signal into the stress signal.3. The method of claim 2 , wherein the component of the receive circuitry is an adaptive equalizer.4. The method of claim 3 , further comprising:recovering data following the signal recovery using CDR (Clock and Data Recovery) circuitry;wherein the at ...

MIXED SIGNAL LOW NOISE INTERFERENCE CANCELLATION

RF communication systems with interference cancellation for coexistence are provided herein. In certain embodiments, an RF communication system includes a transmitter that transmits a transmit signal through a first front end circuit, a receiver that processes a receive signal from a second front end circuit, and a feedback receiver that processes a feedback signal from the first front end circuit to generate a digital interference cancellation signal that compensates the receiver for interference arising from the transmitter. 1. A wireless device comprising:a plurality of front end systems including a first front end system and a second front end system; anda plurality of transceivers including a first transceiver including a transmitter configured to transmit a transmit signal through the first front end system, and a second transceiver including a receiver configured to process a receive signal from the second front end system, the second transceiver further including a first feedback receiver configured to process a first feedback signal from the first front end system to generate a first digital interference cancellation signal, and to provide the first digital interference cancellation signal to the receiver for compensating the receive signal for interference arising from the transmitter.2. The wireless device of wherein the receiver is configured to process the receive signal to generate a digital receive signal claim 1 , and to generate a compensated digital receive signal based on digitally compensating the digital receive signal with the first digital interference cancellation signal.3. The wireless device of wherein the first front end system provides the first feedback signal to the first feedback receiver along a feedback path claim 1 , the first front end system including a multi-throw switch configured to provide the first feedback signal to the feedback path in a first mode claim 1 , and to disconnect the feedback path in a second mode.4. The ...

Communication system, full duplex transceiver assembly and full duplex transceiver amplifier assembly therefor, and associated method

A communication system includes a plurality of full duplex transceiver assemblies each having an ON condition and an OFF condition, and configured to be worn by a different user, each of the plurality of full duplex transceiver assemblies having a housing and printed circuit board coupled to the housing, the printed circuit board including a transceiver having a microprocessor. Each microprocessor is configured to emit a different stream of controlling data when the plurality of full duplex transceiver assemblies are in the ON condition, thereby allowing each of the plurality of full duplex transceiver assemblies to communicate among a plurality of different logical channels. Embedded with each different stream of controlling data is a unique identification number for grouping each of the plurality of full duplex transceiver assemblies together.

BAND SWITCHING BALUN

A band-switching network includes a dual-band balun and a switch network. The dual-band balun includes a first output and a second output. The switch network includes a first switch and a second switch in which an input to the first switch is coupled to the first output and an input to the second switch is coupled to the second balanced output. The dual-band balun further includes a primary coil, a first secondary coil and a second secondary coil in which the first secondary coil is coupled to the first balanced output and the second secondary coil is coupled to the second balanced output. In one embodiment, the primary coil and the first secondary coil are coupled by a first coupling factor k, and the primary coil and the second secondary coil are coupled by a second coupling factor kthat is different from the first coupling factor k. 1. A band-switching network , comprising:a dual-band circuit comprising a first output and a second output, a primary coil, a first secondary coil coupled to the first output and a second secondary coil coupled to the second output, a layout of first secondary coil is located within a layout of the primary coil, and wherein the layout of the primary coil is located within a layout of the second secondary coil; anda switch network comprising a first switch and a second switch, an input to the first switch being coupled to the first output and an input to the second switch being coupled to the second output.2. The band-switching network of claim 1 , wherein the dual-band circuit comprises a dual-band balun claim 1 , andwherein a layout of the dual-band balun comprises a single balun footprint.3. The band-switching network of claim 1 , wherein a frequency band of the first output comprises a Fifth Generation (5G) 28G band claim 1 , and a frequency band of the second output comprises a 5G 39G band.4. The band-switching network of claim 3 , wherein an output of the first switch is coupled to an output of the second switch.5. The band- ...

Pam-4 dfe architectures with symbol-transition dependent dfe tap values

Decision feedback equalization (DFE) is used to help reduce inter-symbol interference (ISI) from a data signal received via a band-limited (or otherwise non-ideal) channel. A first PAM-4 DFE architecture has low latency from the output of the samplers to the application of the first DFE tap feedback to the input signal. This is accomplished by not decoding the sampler outputs in order to generate the feedback signal for the first DFE tap. Rather, weighted versions of the raw sampler outputs are applied directly to the input signal without further analog or digital processing. Additional PAM-4 DFE architectures use the current symbol in addition to previous symbol(s) to determine the DFE feedback signal. Another architecture transmits PAM-4 signaling using non-uniform pre-emphasis. The non-uniform pre-emphasis allows a speculative DFE receiver to resolve the transmitted PAM-4 signals with fewer comparators/samplers.

EIGENVALUE-BASED PASSIVE INTERMODULATION DETECTION

A method and network node for detection of passive intermodulation (PIM) are disclosed. According to one aspect, a method includes determining values of a covariance matrix based at least in part on uplink signals received by the network node radio. The method also includes determining a plurality of uplink (UL) channel 5 eigenvalues based at least in part on an eigen-component acquisition technique. The method further includes determining a presence or absence of PIM based at least in part on a plurality of the UL channel eigenvalues. 1. A method for detection of passive intermodulation , PIM , in a network node radio based at least in part on uplink , UL , channel eigenvalues , the method comprising:determining values of a covariance matrix based at least in part on uplink signals received by the network node radio;determining a plurality of UL channel eigenvalues based at least in part on an eigen-component acquisition technique; anddetermining a presence or absence of PIM based at least in part on the plurality of the UL channel eigenvalues.2. The method of claim 1 , wherein the eigen-component acquisition technique is one of determining eigenvalues from the covariance matrix values or and subspace tracking.3. The method of claim 1 , wherein the plurality of UL channel eigenvalues are determined one or more of in a time-domain claim 1 , a frequency-domain claim 1 , using an entire channel bandwidth and a frequency resolution less than the entire channel bandwidth.4. The method of claim 1 , wherein different UL channel eigenvalues are determined for each of a plurality of polarizations of antennas of the network node radio and the presence or absence of PIM is determined for each of the plurality of polarizations.5. The method of claim 1 , wherein the plurality of UL channel eigenvalues are mapped against a corresponding downlink transmitted power to determine the presence or absence of PIM.6. The method of claim 1 , wherein UL channel eigenvalues failing to meet ...

OPTIMIZATION OF AUTOMATIC GAIN CONTROL FOR NARROW BANDWIDTH OPERATION

The gain of an amplifier in a receiver operating in a cellular communication system is controlled by determining one or more gain variability metrics, which are then used to produce first and second threshold values. A frequency difference between a current carrier frequency and a target carrier frequency is ascertained and then compared to the threshold values. Target gain setting production is based on comparison results: If the frequency difference is larger than the first threshold, a first automatic gain control algorithm is performed; if the frequency difference is smaller than the first threshold and larger than the second threshold, a second automatic gain control algorithm is performed, wherein the second automatic gain control algorithm uses a current gain setting as a starting point; and if the frequency difference is smaller than both the first and second thresholds, the current gain setting is used as the target gain setting. 1. A method of controlling gain of an amplifier in a receiver operating in a cellular communication system , the method comprising:ascertaining a frequency difference between a current carrier frequency and a target carrier frequency;comparing the frequency difference to a first threshold value;in response to satisfaction of first criteria that include the frequency difference being larger than the first threshold value, performing a first automatic gain control algorithm to produce a target gain setting;in response to satisfaction of second criteria that include the frequency difference being smaller than the first threshold, performing a second automatic gain control algorithm to produce the target gain setting; andusing the target gain setting to control gain of the amplifier.2. The method of claim 1 , wherein the second criteria further include the frequency difference being larger than a second threshold value.3. The method of claim 2 , comprising:using one or more gain variability metrics to produce the second criteria.4. The ...

WIRELESS TERMINAL AND WIRELESS COMMUNICATION METHOD

A first quadplexer receives a transmission signal in a first frequency band from a radio frequency transceiver and outputs the transmission signal to a first antenna, and receives a signal from the first antenna and outputs reception signals in third and fourth frequency bands to the radio frequency transceiver. A second quadplexer receives a transmission signal in a second frequency band from the radio frequency transceiver and outputs the transmission signal to a second antenna, and receives a signal from the second antenna and outputs reception signals in the third and fourth frequency bands to the radio frequency transceiver. The radio frequency transceiver converts a signal from the quadplexer into a baseband signal. A baseband IC subjects baseband signals generated from signals in the same frequency band to MIMO reception processing. 1. A wireless terminal capable of transmission using a first frequency band and a second frequency band and reception using a third frequency band and a fourth frequency band , the wireless terminal comprising:a first antenna;a second antenna;a radio frequency transceiver configured to convert a frequency of two systems of upstream baseband signals and output a transmission signal in the first frequency band and a transmission signal in the second frequency band;a baseband processing unit which subjects a downstream signal received from the radio frequency transceiver and an upstream signal to be output to the radio frequency transceiver to baseband processing;a first multiplexer configured to receive the transmission signal in the first frequency band from the radio frequency transceiver and output the transmission signal to the first antenna and configured to receive a signal from the first antenna and output a reception signal in the third frequency band and a reception signal in the fourth frequency band to the radio frequency transceiver; anda second multiplexer configured to receive the transmission signal in the second ...

Signal receiving method and electronic device

An electronic device including a first transceiver configured to process a first carrier, a second transceiver configured to process a second carrier, a switch, a baseband processor configured to process a first baseband signal and a second baseband signal, which are processed respectively by the first transceiver and the second transceiver, an antenna connected through the switch in association with some of a plurality of reception paths with respect to the first carrier, and a reception path configured to provide the second transceiver with the first carrier received via the antenna connected through the switch to the second transceiver.

Passive mixer with feed-forward cancellation

A radio frequency (RF) front-end receiver having a passive mixer with feed-forward intermodulation distortion cancellation, or at least reduction. An example receiver generally includes a mixer having differential input terminals and differential output terminals and a baseband filter having inputs coupled to the differential output terminals of the mixer. The receiver also includes common-mode sensing circuitry coupled to the differential input terminals of the mixer and configured to sense a common-mode signal of a first differential signal present at the differential input terminals of the mixer. The receiver further includes a conversion circuit coupled to the common-mode sensing circuitry and configured to convert the common-mode signal to a second differential signal presented to the differential output terminals of the mixer and the inputs of the baseband filter.