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 ...

УСТРОЙСТВО И СПОСОБ ДЛЯ ПЕРЕДАЧИ/ПРИЕМА КОНТРОЛЬНЫХ СИГНАЛОВ В СИСТЕМЕ СВЯЗИ, ИСПОЛЬЗУЮЩЕЙ СХЕМУ МУЛЬТИПЛЕКСИРОВАНИЯ С ОРТОГОНАЛЬНЫМ ЧАСТОТНЫМ РАЗДЕЛЕНИЕМ КАНАЛОВ

Изобретение относится к технике связи. Технический результат состоит в минимизации взаимного влияния между контрольными сигналами. Для этого предложен способ для предоставления контрольного символа для идентификации базовой станции в системе связи со многими входами и многими выходами (MIMO), имеющей одну или более передающих антенн, при этом контрольный символ состоит из первой последовательности, обладающей хорошей характеристикой идентификации соты, и второй последовательности для уменьшения отношения пиковой мощности к средней мощности (PAPR) для всех контрольных символов. 5 н. и 34 з.п. ф-лы, 10 ил., 5 табл.

УСТРОЙСТВО БЕСПРОВОДНОЙ СВЯЗИ И СПОСОБ БЕСПРОВОДНОЙ СВЯЗИ

Изобретение относится к беспроводной связи. Техническим результатом является обеспечение скорости передачи данных, сравнимой с самыми современными проводными цифровыми интерфейсами в беспроводной связи. Устройство беспроводной связи, служащее в качестве устройства NG60 WiGig, включает в себя генератор PPDU, который генерирует MF PPDU (протокольный блок данных физического слоя) PHY-слоя управления, включающий в себя унаследованную преамбулу, унаследованный заголовок, NG60 заголовок (не-унаследованный заголовок), поле данных, и информацию идентификации, указывающую, что включен не-унаследованный заголовок, и передатчик, который передает сгенерированный MF PPDU PHY-слоя управления. 2 н. и 8 з.п. ф-лы, 18 ил.

Способ формирования сигналов с расширенным спектром

Изобретение относится к помехозащищённым системам связи и может быть использовано для формирования сигналов с расширенным спектром. Технический результат – повышение скорости передачи информации и разведзащищённости, снижение уровня внеполосного излучения. Способ формирования состоит в том, что формируют две квазиортогональные псевдослучайные последовательности, синхронизирующую и информационную. Формируют К последовательностей путём суммирования по модулю двух циклически сдвинутых синхронизирующей и информационной ПСП. Циклические сдвиги синхронизирующей ПСП фиксированы и различны, а информационной ПСП определяются К символами передаваемой информации. Двоичные символы последовательностей заменяют целыми противоположными числами. Формируют последовательность комплексных чисел, действительная часть которых является суммой элементов L из К преобразованных последовательностей, а мнимая – суммой элементов оставшихся (К-L) последовательностей и преобразованной синхронизирующей ПСП. В начале ...

ФАЗОВО-МАНИПУЛИРОВАННЫЙ СИГНАЛЬНЫЙ ТОН

Изобретение относится к средствам для формирования и передачи акустического сигнала. Технический результат заключается в повышении эффективности формирования и передачи акустических сигналов. Устройство включает в себя аудиопередатчик и процессорную схему. Кодируют, посредством процессорной схемы, сообщение с данными в качестве последовательности символов. При этом каждый символ ассоциирован с периодом времени и передачей аудионесущей в течение периода времени. При этом каждый символ кодирует значение данных, которое ассоциировано с соответствующими фазовыми характеристиками аудионесущей. Формируют, посредством процессорной схемы, аудиовыборки оцифрованной версии последовательности символов с использованием фазовых характеристик аудионесущей, ассоциированной с символами. Управляют аудиопередатчиком, чтобы формировать и передавать акустический сигнал, на основе аудиовыборок. Ассоциируют, посредством процессорной схемы, каждый символ с комплексной фазой. Формируют комплексный сигнал основной ...

СПОСОБ ФОРМИРОВАНИЯ ПОМЕХОЗАЩИЩЕННЫХ ГИБРИДНЫХ ФАЗОМАНИПУЛИРОВАННЫХ СИГНАЛОВ

Изобретение относится к области радиотехники и может быть использовано в системах передачи информации посредством фазоманипулированных сигналов Технический результат - повышение помехозащищенности формируемого гибридного фазоманипулированного сигнала. В способе формирования помехоустойчивых гибридных фазоманипулированных сигналов посредством последовательной конкатенации радиоимпульсов из цифровой последовательности формируют управляющую импульсную последовательность. Затем формируют манипулирующие радиоимпульсы на основе гармонического колебания и вейвлета Гаусса первого порядка, в которых уменьшают длительности радиоимпульсов, сформированных на основе гармонического колебания, таким образом, чтобы полоса частот, занимаемого ими спектра была равной полосе частот, занимаемой спектром радиоимпульсов, сформированных на основе вейвлета Гаусса первого порядка. 7 ил.

Способ пакетной передачи данных шумоподобными фазоманипулированными сигналами

Изобретение относится к области радиотехники и может найти применение в системах помехозащищенной пакетной передачи данных. Техническим результатом изобретения является повышение скорости передачи данных. Способ пакетной передачи данных шумоподобными фазоманипулированными сигналами заключается в том, что формируют две двоичные периодические псевдослучайные последовательности, синхронизирующую (СП) и информационную (ИП). СП является М-последовательностью, а ИП образована из М-последовательности путем добавления одного постоянного элемента. В начале передачи каждого пакета данных фазируют ИП с СП и передают синхросигнал с квадратурной фазовой манипуляцией, для формирования которого сигнал несущей частоты сначала манипулируют по фазе СП, а затем дополнительно сдвигают по фазе на 90 градусов на тех интервалах времени, на которых значения СП и ИП не совпадают. Длительность синхросигнала выбирают равной целому количеству периодов повторения ИП. При передаче данных на каждом периоде повторения ...

Устройство формирования структурно-скрытых сигналов с двухпозиционной манипуляцией

Заявленное устройство относится к электросвязи. Техническим результатом заявляемого устройства является повышение помехоустойчивости формируемого сигнала на основе его структурной скрытности при воздействии имитационных помех. Для достижения технического результата предлагается устройство, состоящее из источника сообщений (1), скремблера (2), блока датчиков случайных чисел (3), первого (4), второго (5), третьего (6), четвертого (7) синтезаторов частот, первого (8), второго (9), третьего (10), четвертого (11), пятого (12), шестого (13), седьмого (14), восьмого (15) управляемых ключей, первого (16), второго (17), третьего (18), четвертого (19) сумматоров, первого (20), второго (21), третьего (22), четвертого (23) генераторов псевдослучайной последовательности, регистра сдвига (24), схемы «И» (25), блока управляемых аттенюаторов (26), первой (27), второй (28), третьей (29), четвертой (30) схем «ИЛИ». 2 з.п. ф-лы, 3 ил.

СИСТЕМА КОМБИНИРОВАНИЯ СИГНАЛОВ ДЛЯ ПЕРЕДАЧИ ИНФОРМАЦИИ ПОСРЕДСТВОМ ПОСТОЯННОЙ ОГИБАЮЩЕЙ

... 1. Способ осуществления передачи (256) постоянной огибающей посредством несущего сигнала (207), согласно которому:определяют (900) все возможные комбинации из всех кодов (602) компонентов для фаз (500) для осуществления передачи (256);определяют (902) необходимые мощности (234) кодов компонентов и необходимые межкодовые фазы (236) между всеми парами кодов (214) компонентов;определяют (904) часть переменных процесса (224) поиска, чтобы уменьшить множество переменных (228), находимых посредством процесса (224) поиска;определяют (906) дельты (238) и весовые отклонения (240) для стандартных разностей (242) в матрице Якоби (244) для использования в процессе (224) поиска;определяют (908) штрафные коэффициенты (248) для оценивания целевой функции (246) процесса (224) поиска иосуществляют (910) процесс (224) поиска.2. Способ по п. 1, согласно которому кроме того:оценивают вторую четверть фаз (500) на основании Q-симметрии иоценивают оставшиеся две четверти фаз (500) на основании Q-симметрии и Р-симметрии ...

УСТРОЙСТВО ДЛЯ ПЕРЕДАЧИ ШИРОКОПОЛОСНОГО ФАЗОМАНИПУЛИРОВАННОГО СИГНАЛА

Полезная модель относится к области радиотехники и может быть использована в широкополосных системах радиосвязи, функционирующих в сложной помеховой обстановке для повышения помехозащищенности процесса передачи информации, при этом обеспечивая передачу одного и двух повторов псевдослучайной последовательности за длительность одного информационного символа. Техническим результатом полезной модели является расширение функциональных возможностей устройства для передачи широкополосного фазоманипулированного сигнала, а именно обеспечение передачи как одного повтора псевдослучайной последовательности, так и двух повторов псевдослучайной последовательности за длительность одного информационного символа за счет внесения дополнительных элементов на определенных позициях электрической схемы. Устройство для передачи широкополосного фазоманипулированного сигнала дополнительно содержит второй генератор тактовых импульсов, пятый элемент И и четвертый элемент ИЛИ. 2 ил.

MULTIPLEXVERFAHREN UND MULTIPLEXVORRICHTUNG SOWIE VERFAHREN UND VORRICHTUNG ZUR ÜBERTRAGUNG VON DATENSIGNALEN

VORRICHTUNG ZUR DRAHTLOSEN DIGITALEN KOMMUNIKATION UND PULSFORMUNGSNETZWERK

REFLEKTIONSMODULATORSCHALTUNG MIT VERSTÄRKER MIT NEGATIVER IMPEDANZ

SYSTEM UND VERFAHREN FÜR DRAHTLOSE KOMMUNIKATION ZUR VERBESSERUNG DER KOEXISTENZ VON AUFWECK-PAKETEN

Drahtloses Kommunikationssystem und Verfahren. Das System enthält eine Verarbeitungs-Schaltungsanordnung und einen Sendeempfänger, der mit der Verarbeitungs-Schaltungsanordnung gekoppelt ist. Die Verarbeitungs-Schaltungsanordnung enthält eine Logik, um ein Aufweckpaket zu erzeugen, das an ein anderes drahtloses Kommunikationssystem adressiert ist und einen Legacy-Präambel-Abschnitt und einen Aufweckabschnitt enthält, wobei der Legacy-Präambel-Abschnitt gemäß einer ersten Modulationsrate moduliert wird. Der Aufweckabschnitt wird gemäß einer zweiten Modulationsrate moduliert, die niedriger als die erste Modulationsrate ist, und enthält Informationen, um das andere drahtlose Kommunikationssystem aufzuwecken. Das Sendeempfängersystem soll die Legacy-Präambel mithilfe eines ersten Übertragungsleistungspegels übertragen und den Aufweckabschnitt mithilfe eines zweiten Übertragungsleistungspegels übertragen, der um einen vorbestimmten Betrag höher als der erste Übertragungsleistungspegel ist, so ...

Lese-/Schreibgerät und Kommunikationsverfahren dafür

Amplifier arrangement for use in polar transmitter, has DC converter releasing supply potential into connector of amplifier stage, and digital-analog converter converting amplitude modulation word into analog signal for controlling stage

The arrangement has a DC converter (1) converting a potential (VDD) into a supply potential and releasing the supply potential into a connector (52) of an amplifier stage (5). A digital-to-analog converter (20) has an input connected to a signal input and has an output (21) connected at a control connector (51) of the stage. The digital-analog converter converts amplitude modulation word into an analog signal for controlling the stage. Independent claims are also included for the following: (1) a polar transmitter with an amplifier arrangement (2) a method for signal amplification.

Wireless communications methods and apparatus

Digital modulation circuit

A modulator circuit (150) for generating a modulated, DQPSK signal. The modulator circuit includes an encoder (162) for receiving a binary bit stream comprised of bit pairs defining differential phase changes. An encoder receives a bit stream of which bit pairs thereof define differential phase changes. The encoder encodes the bit pairs into codewords which are stored and then supplied to an I-accumulator (230), a Q-accumulator (236), and a memory element (242). The memory element contains premultiplied values which are supplied to the I- and the Q-accumulators which add terms of the pre-multiplied values to form I-portions and Q-portions of a DQPSK-modulated signal. The I- and Q-portions may then be supplied to a quadrature modulator. ...

Apparatus for radio telecommunication system and method of building up output power

VITERBI ENTZERRUNG WITH DETERMINATION FROM NEAREST POINTS OF CONSTELLATION TO THE CONDITION REDUCTION

BIT-INTERLOCKED CODED MODULATION WITH LOW DENSITY PARITY CHECK (LDPC) CODES

PROCEDURE AND DEVICE FOR COMMUNICATION BETWEEN CLIENT EQUIPMENT AND A LINEAR WIDEBAND NETWORK

PRODUCTION SIGNALS OUT OF PHASE OF TWO BY 90 DEGREES

Channel assignment and call admission control for spatial division multiple access communication systems

Method and apparatus for pulse overlap pre-compensation in digitally modulated signals

TRANSPORT CHANNEL INTERLEAVING

ENHANCED PHYSICAL DOWNLINK CONTROL CHANNEL SCRAMBLING AND DEMODULATION REFERENCE SIGNAL SEQUENCE GENERATION

Methods, apparatuses, and systems are described to provide enhanced physical downlink control channel scrambling and demodulation reference signal sequence generation. 2842714v1 -4 Moo L OC Uq$. U .- N : r S C4Q >N Qo cj3 ) C-4 00- ...

DC offset cancellation method and device

Disclosed is a DC offset cancellation (DCOC) method, comprising: after a receiver is electrified, acquiring a digital signal of an offset voltage at a circuit output port in the receiver, obtaining a digital control signal for controlling a DCOC output stage from the digital signal, and outputting, by the DCOC output stage, a current to a corresponding circuit of the receiver according to the digital control signal. Also disclosed is a DC offset cancellation device.

Techniques for indicating a frame format for transmissions using unlicensed radio frequency spectrum bands

The present disclosure, for example, relates to one or more techniques for indicating a frame format for transmissions using unlicensed radio frequency spectrum bands. A UE may receive, from a base station, a frame format indicator associated with a transmission opportunity for transmissions in an unlicensed radio frequency spectrum band. The UE may determine a time-division duplexing (TDD) configuration for the transmission opportunity based at least in part on the frame format indicator.

Combined amplitude-time modulation and phase modulation

Abstract A method for generating a compound signal wave with one or more substantially sinusoidal waveform(s) containing encoded digital information combined with a variable phase changing waveform(s) producing a compound notched sinusoid waveform including at least an amplitude-time modulated sine wave and at least one phase modulated wave(s). Presence or absence of change to a wave's sinusoidal amplitude within a phase indicates a data value. These data values can be changed within a data cycle or packet. Reduced modulation distortion is exhibited by amplitude-time modulation techniques when compared to classical amplitude modulation techniques. This reduced distortion in a communications signal results in increased effective transmission lengths, reduced error rates, higher data rates, and improved data security.

8-psk transmission filtering using reduced look-up tables

MULTIPLE PHASE DIGITAL MODULATOR

SYSTEM AND METHOD FOR DEMODULATING A SIGNAL

A demodulating system (100) for demodulating a phase-modulated input sig-nal (Si) comprises: a complex demodulator (110), having a first input (111) for receiving the phase-modulated input signal (Si) and be-ing designed to perform complex multiplica-tion of this signal with an approximation of the inverse of the phase modulation; a spec-trum analyzing device (130) receiving the de-modulated product signal produced by the complex demodulator (110) and capable of an-alyzing the frequency spectrum of the demod-ulated product signal.

DATA PROCESSING DEVICE AND DATA PROCESSING METHOD

This technology pertains to a data processing device and a data processing method that make it possible to ensure good communication quality when using an LDPC code to transmit data. In group-wise interleaving, an LDPC code having a code length of 16,200 bits and a code rate of 6/15, 7/15, 8/15, or 9/15 is interleaved on a per-bit-group basis, each bit group being 360 bits long. In group-wise deinterleaving, the interleaved LDPC code is restored to the original ordering thereof. This technology can be applied, for example, to data transmission or the like using an LDPC code.

METHOD OF SIGNAL GENERATION AND SIGNAL GENERATING DEVICE

A transmission method simultaneously transmitting a first modulated signal and a second modulated signal at a common frequency performs precoding on both signals using a fixed precoding matrix and regularly changes the phase of at least one of the signals, thereby improving received data signal quality for a reception device.

Doppelgegentaktmodulator für die Trägerstrom-Nachrichtentechnik, insbesondere für die Phasenumkehr-Wechselstromtelegraphie.

CONVERTER IN A MODULATOR FOR THE PHASE MODULATION OF DATA SYMBOLS.

使用结构化奇偶校验矩阵的低密度奇偶校验码的编码

... 为对结构化低密度奇偶校验(LDPC)码进行编码的方法提供了方案。在编码处理期间访问存储表示低密度奇偶校验(LDPC)码的结构化奇偶校验矩阵的信息的存储器(1605，1607)。信息被组织成表格形成，其中每个行表示数值1在奇偶校验矩阵的列组的第一列内的存在。各个行对应于奇偶校验矩阵的各个列组，其中根据预定操作导出每个分组内的后续列。根据所存储的表示奇偶校验矩阵的信息输出LDPC编码信号。 ...

COMMUNICATION DEVICE AND COMMUNICATION METHOD

Spatial modulation method for large-scale MIMO system and large-scale MIMO system

Method of transmitting control signals in wireless communication system

METHOD AND SYSTEM FOR GENERATING LOW DENSITY PARITY CHECK CODES

PURPOSE: A method and a system for generating low density parity check codes are provided to enable a very simple encoding method without requiring a generator matrix of a code by restricting a certain part of a parity check matrix to be lower triangular. CONSTITUTION: A digital communications system(100) includes a transmitter(101) that generates signal waveforms across a communication channel(103) to a receiver(105). In the digital communications system, the transmitter has a message source that produces a discrete set of possible messages. Each of the possible messages has a corresponding signal waveform. These signal waveforms are attenuated, or otherwise altered, by communications channel. To combat the noise channel, LDPC codes are utilized. The transmitter generates, using a relatively simple encoding technique, LDPC codes based on parity check matrices to communicate with the receiver. © KIPO 2004 ...

Apparatus and Method of Transmission of Hierarchically Modulated Signal

sistema de transmissço sem fios e dispositivo e mÉtodo de comunicaÇço sem fios

switched signaling tone phase shift of

Digital data modulator and digital-to-analog converter

A digital modulator for selectably generating differential phase shift keyed (PSK) data signals and frequency shift keyed (FSK) data signals is disclosed. A clock generator (10) provides carrier frequency clock signals and a plurality of phase-shifted high frequency clock signals. A CLX generator (11) selects the proper PSK or FSK carrier clock. A data scrambler (17) accepts a serial data input stream and provides the scrambled dibit to the dibit encoder (12). The dibit encoder (12) converts the scrambled dibit into two phase-shifting control signals. A three-tap finite impulse response filter (13) generates carrier phase signals by splitting each cycle of the selected carrier clock into eight phases, and, for PSK operation, provides phase shifting in response to the two phase-shifting control signals. A multiplexer (14) selects one of the phase-shifter high frequency clocks in response to the carrier phase signals. A signal selector (15) converts the selected phase-shifted high frequency ...

Method and apparatus for modulating digital data

The modulator includes an oscillator generating signals, each having a different phase, and a selector receiving digital data. When the digital data received by the selector changes logic state, the selector supplies a first and second plurality of signals generated by the oscillator to first and second non-linear amplifiers, respectively. An adder then adds the output of each amplifier to generate a radio frequency output.

Communication system employing chaotic sequence based frequency shift keying spreading signals

A candidate arbitrary-phase spread spectrum modulation technique that offers similar performance to spread continuous phase modulation (CPM) waveforms and additional capabilities for programming a chosen frequency domain spectra into the resulting spread spectrum signal. The proposed chaotic-FSK waveform is derived from high-order sequence-based spread spectrum signals, with multi-bit resolution chaos-based sequences defining incremental phase words, enabling real-time efficient generation of practically non-repeating waveforms. A result of the C-FSK formulation is a parameterized hybrid modulation capable of acting like a traditional sequence-based spread spectrum signal or a traditional frequency shift keying signal depending on chosen parameters. As such, adaptation in this modulation may be easily implemented as a time-varying evolution, increasing the security of the waveform while retaining many efficiently implementable receiver design characteristics of traditional PSK modulations ...

Method and apparatus for transmitting reference signal

The present disclosure relates to sending methods and apparatus. One example method includes receiving first indication information for uplink data transmission, where the first indication information indicates a frequency resource for the uplink data transmission, and the frequency resource includes N subcarriers, and sending an uplink reference signal associated with the uplink data transmission, where a length of a sequence of the uplink reference signal is M, a roll-off factor of a filter for the uplink data transmission is not greater than2⁢⁢MN-1,and N/2≤M Подробнее

HIGH SPEED INTERLEAVER/DEINTERLEAVER DEVICE SUPPORTING LINE RATE, AND METHOD THEREOF

A deinterleaver device, a method for deinterleaving, an interleaver device, and a method for interleaving are disclosed. The method for deinterleaving includes: providing a memory and a stream count for a frame; virtually dividing the memory into equal sections, wherein a section count equals the stream count; calculating a write address for a sample of the samples based on a location of the sample in the frame and a correspondence of the location to one of the sections; receiving the sample; and writing the received sample to the write address, wherein the calculating and the write address corresponds to a correct deinterleaving location in one of the sections for the sample.

MULTIPLEXING LARGE PAYLOADS OF CONTROL INFORMATION FROM USER EQUIPMENTS

An apparatus and method are provided for transmitting Uplink Control Information (UCI) over a Physical Uplink Control CHannel (PUCCH) in a communication system. A method includes acquiring, by the UE, information for configuration of a first PUCCH format and a second PUCCH format; generating, by the UE, UCI to be transmitted; selecting, by the UE, one of the first PUCCH format and the second PUCCH format for transmitting the UCI; encoding, by the UE, the generated UCI; performing, by the UE, an Inverse Fourier Transform (IFT) operation on the encoded UCI; and transmitting, by the UE, the IFT performed UCI using the selected PUCCH format. One of the first PUCCH format and the second PUCCH format is selected by the UE, based on a transmission on multiple carriers from a base station.

Enhanced physical downlink control channel scrambling and demodulation reference signal sequence generation

Methods, apparatuses, and systems are described to provide enhanced physical downlink control channel scrambling and demodulation reference signal sequence generation.

Multiplexing large payloads of control information from user equipments

An apparatus and method for transmitting Uplink Control Information (UCI) over a Physical Uplink Control CHannel (PUCCH) in a communication system. A method includes acquiring, by a user equipment (UE), from an evolved Node B (eNB), information for a PUCCH format associated with multiple cells; generating, by the UE, UCI to be transmitted, wherein the UCI being arranged in an order of an index of the multiple cells if the PUCCH format is used; modulating, by the UE, the UCI by using quadrature phase shift keying (QPSK); performing, by the UE, a Fourier transform (FT) operation on the modulated UCI; performing, by the UE, an inverse Fourier transform (IFT) operation on the Fourier transformed UCI; and transmitting, by the UE, the inverse Fourier transformed UCI using the PUCCH format based on the information for the PUCCH format.

Codebook construction

A method implemented in a base station used in a wireless communications system is disclosed. The method comprises having a codebook including a plurality of precoding matrices, precoding data with one of the plurality of precoding matrices, and transmitting, to a user equipment, the precoded data, wherein each precoding matrix W satisfies W=W(1)W(2), where first matrix W(1) is chosen from first codebook (1), and second matrix W(2) is chosen from a second codebook. Other apparatuses, systems, and methods also are disclosed.

METHOD FOR SIGNALING INFORMATION BY MODIFYING MODULATION CONSTELLATIONS

Methods and systems for communicating in a wireless network may distinguish different types of packet structures by modifying the phase of a modulation constellation, such as a binary phase shift keying (BPSK) constellation, in a signal field. Receiving devices may identify the type of packet structure associated with a transmission or whether the signal field is present by the phase of the modulation constellation used for mapping for the signal field. In one embodiment, the phase of the modulation constellation may be determined by examining the energy of the I and Q components after Fast Fourier Transform. Various specific embodiments and variations are also disclosed.

SEMICONDUCTOR DEVICE AND COMMUNICATION SYSTEM INCLUDING THE SAME

Provided are a semiconductor device including a modulator for PSK communication and a semiconductor device including a demodulator for PSK communication, and a PSK communication system. The semiconductor device includes a reference clock generator to generate a reference clock signal, a phase locked loop (PLL) to receive the reference clock signal and generate a first clock signal, an integer divider circuit to generate a second clock signal by delaying a rising edge of the reference clock signal by a product of a predetermined integer value included in transmission data and a phase interval, and a processing unit to generate a first transmission signal. The first transmission signal is phase-shifted from a first rising edge of the second clock signal. The phase interval is dependent on a ratio of the frequency of the first clock signal to the frequency of the reference clock signal.

FILTERED ORTHOGONAL BINARY PHASE SHIFT KEYING MODULATION WITH LOW PEAK-TO-AVERAGE-POWER RATIO

Methods, systems, and devices for wireless communications are described. A transmitting device may modulate a first binary sequence using binary phase shift keying on a first axis of a complex plane. The device may modulate a second binary sequence using binary phase shift keying on a second plane of a complex axis. The first axis and the second axis may be orthogonal. The device may transmit the first binary sequence and the second binary sequence according to the modulation of the first binary sequence and the second binary sequence.

MULTIPLEXING LARGE PAYLOADS OF CONTROL INFORMATION FROM USER EQUIPMENTS

Disclosed is multiplexing transmissions of Uplink Control Information (UCI) signals having variable payloads from User Equipments (UEs). The UCI transmission uses a first format type if its size is less than or equal to a predetermined values and it uses a second format type if its size is greater than a predetermined value. When the first format type is used the UE multiplexing is through a first method while when the second format type is used the UE multiplexing is through a second method which is different than the first method. The structure of the second format type is the same as the structure used for the transmission of data information by UEs. The UEs can also be grouped and UCI transmission can be triggered through the reception of control signaling addressing a group of UEs and indicating UCI transmission by a sub-group of UEs in the group of UEs.

Vehicle bus message authentication using watermarking

An electronic control unit comprises circuitry to receive a combined signal via a vehicle bus of a vehicle, wherein the combined signal contains a combination of a data signal and a watermark signal, which can be a radio frequency (RF) signal or an analog baseband signal, wherein the data signal includes a message, circuitry to extract a watermark from the watermark signal, circuitry to verify the watermark based on a comparison of the watermark with a pre-defined watermark, circuitry to extract the data signal from the combined signal and obtain the message from the data signal, and circuitry to authenticate the message based on the verification of the watermark.

APPARATUS AND METHOD FOR TRANSMITTER PHASE SHIFT COMPENSATION

BIT-INTERLEAVED CODED MODULATION USING LOW DENSITY PARITY CHECK (LDPC) CODES

An approach is provided for bit labeling of a signal constellation. A transmitter (200) generates encoded signals using, according to one embodiment, a structured parity check matrix of a Low Density Parity Check (LDPC) code. The transmitter (200) includes an encoder (203) for transforming an input message into a codeword represented by a plurality of set of bits. The transmitter (200) includes logic for mapping non-sequentially (e.g., interleaving) one set of bits into a higher order constellation (Quadrature Phase Shift Keying (QPSK), 8-PSK, 16-APSK (Amplitude Phase Shift Keying), 32-APSK, etc.), wherein a symbol of the higher order constellation corresponding to the one set of bits is output based on the mapping.

DEVICE AND METHOD FOR PROCESSING A DIGITAL DATA SIGNAL IN A CDMA RADIO TRANSMITTER

The invention relates to a device for processing a digital data signal in a CDMA radio transmitter, comprising a channeling device (SC), a spectral shaping device (ESF) and a frequency correction device (FK). The channeling device (SC) impresses a CDMA code pertaining to each individual channel upon the digital data signal and the spectral shaping device (ESF) subjects the digital, individual channel data signal to a spectral shaping procedure and a frequency correction device (FK) subjects the digital spectral shaped data signal to a spectral shifting procedure.

Data transmission and reception system

A data transmission and reception system according to this invention comprises a transmitter for transmitting data by modulating transmit data and a receiver for receiving and demodulating a signal from the receiver, wherein the receiver includes a parallel resonator for receiving a PSK signal; a full rectification circuit for detecting output from the parallel resonator; a low pass filter for shaping the waveform of output from the full rectification circuit; and a comparator for converting output from the low pass filter into a binary-coded signal so that demodulated signals can be obtained from the output of the comparator. Therefore, PSK signals can be demodulated without a PLL or a tank circuit, the overall system consumes a smaller amount of power and is thin and reliable, the transmitter has an amplifier that can operate efficiently, particularly with a limited power supply as in IC cards or a single power supply used for portable terminals, and the receiver is reliable even with ...

CANCELING CIRCUIT FOR LOCAL LEAKAGE IN HIGH FREQUENCY BAND, RADAR APPARATUS, AND DIGITAL RADIO COMMUNICATION APPARATUS

PROBLEM TO BE SOLVED: To cancel local leakage by easily enlarging amount of phase shift. SOLUTION: In view of removing the carrier signal element included in a high frequency transmitting signal, an original carrier signal outputted from a carrier oscillator 11 is distributed by a distributor 15 for modulation in a multiplier 13 and canceling of carrier signal element after the modulation. The original carrier signal for modulation is multiplied with a first multiplier 21. The original carrier signal for cancellation is subjected to the phase shift in a phase shifter 16. The phase shifter 16 is easily capable of conducting the phase shift in a large amount because the phase shift is carried out in the frequency lower than the carrier signal. The original carrier signal inverted in phase by the phase shift is level-adjusted with a level adjuster 19, and is multiplied with a second multiplier 22 to cancel, with a demultiplexer 20, the carrier signal element included in the high frequency ...

СИСТЕМА КОМБИНИРОВАНИЯ СИГНАЛОВ ДЛЯ ПЕРЕДАЧИ ИНФОРМАЦИИ ПОСРЕДСТВОМ ПОСТОЯННОЙ ОГИБАЮЩЕЙ

... аИзобретение относится к средствам для осуществления передачи (256) постоянной огибающей посредством несущего сигнала (207). Технический результат заключается в повышении энергетической эффективности тона несущего сигнала при модуляции для передачи составной последовательности бит информации. Определяют все возможные комбинации из всех кодов (602) компонентов для фаз (500) для осуществления указанной передачи (256), также определяют необходимые мощности (234) кодов компонентов и необходимые межкодовые фазы (236) между всеми парами кодов (214) компонентов. При этом определяют часть переменных процесса (224) поиска, чтобы уменьшить количество переменных (228), находимых посредством процесса (224) поиска. Кроме того, определяют дельты (238) и весовые отклонения (240) для стандартных разностей (242) в матрице Якоби (244) для использования в процессе (224) поиска с определением штрафных коэффициентов (248) для оценивания целевой функции (246) процесса (224) поиска. 2 н. и 13 з.п. ф-лы, 11 ил ...

СПОСОБ И УСТРОЙСТВО ДЛЯ ПРЕДВАРИТЕЛЬНОЙ КОМПЕНСАЦИИ ПЕРЕКРЫТИЯ ИМПУЛЬСОВ В СИГНАЛАХ С ЦИФРОВОЙ МОДУЛЯЦИЕЙ

Изобретение относится к области радиовещания, в частности к цифровому радиовещанию в режиме амплитудной модуляции. Способ предварительной компенсации перекрытия импульсов в сигнале с цифровой модуляцией заключается в том, что принимают последовательность импульсов, модулируют первую последовательность импульсов для получения первой последовательности модулированных импульсов, демодулируют первую последовательность модулированных импульсов для получения первой последовательности демодулированных импульсов, складывают первую последовательность демодулированных импульсов с первой последовательностью импульсов для получения первой последовательности импульсов ошибки, модулируют первую последовательность импульсов ошибки для получения первой последовательности модулированных импульсов ошибки и складывают первую последовательность модулированных импульсов ошибки с первой последовательностью модулированных импульсов для получения первой последовательности скомпенсированных импульсов. Технический ...

СПОСОБ ФОРМИРОВАНИЯ ШУМОПОДОБНЫХ ФАЗОМАНИПУЛИРОВАННЫХ СИГНАЛОВ

Изобретение относится к области радиотехники и может быть использовано в системах радиосвязи. Технический результат состоит в повышении помехоустойчивости передаваемых сигналов. Для этого формируют две квазиортогональные двоичные псевдослучайные последовательности (ПСП), сфазированные между собой, – синхронизирующую и информационную. Синхронизирующая ПСП является периодической, а на каждом периоде ее повторения информационную ПСП циклически сдвигают на количество элементов, определяемое передаваемым информационным символом. Формируют дополнительную ПСП путем непрерывного повторения укороченной на один элемент информационной ПСП. Сигнал несущей частоты манипулируют по фазе синхронизирующей ПСП на четных периодах ее повторения, а в остальное время манипулируют по фазе последовательностью, которую формируют поэлементным сложением по модулю два синхронизирующей ПСП и дополнительной ПСП. Сигнал несущей частоты сдвигают по фазе на девяносто градусов и манипулируют по фазе последовательностью, ...

СПОСОБ ФОРМИРОВАНИЯ ШУМОПОДОБНЫХ ФАЗОМАНИПУЛИРОВАННЫХ СИГНАЛОВ

Изобретение относится к области радиотехники и может быть использовано в радиосистемах для снижения уровня внеполосных излучений. Технический результат – снижение скачков фазы до девяноста градусов формируемого сигнала, которым манипулируют сигналы несущей частоты. Такой технический результат обеспечивается тем, что формируют два сигнала несущей частоты, сдвинутые между собой по фазе на девяносто градусов, и сигнал тактовой частоты, из которого формируют синхронизирующую (СП) и информационную (ИП) псевдослучайные последовательности. Формируют модулирующую последовательность, текущий элемент которой равен предыдущему, если текущий элемент СП отличается от предыдущего элемента СП, в противном случае он равен текущему элементу циклически сдвинутой ИП, а второй сигнал несущей частоты манипулируют по фазе на сто восемьдесят градусов инвертированными или неинвертированными элементами модулирующей последовательности, в зависимости от значения дополнительного передаваемого бита информации и суммируют ...

ПЕРЕДАЮЩИЙ ТРАКТ БОРТОВОЙ РАДИОЛОКАЦИОННОЙ СТАНЦИИ БЕСПИЛОТНОГО ЛЕТАТЕЛЬНОГО АППАРАТА

Передающий тракт бортовой радиолокационной станции (БРЛС) беспилотного летательного аппарата (БПЛА), содержащий опорный генератор (ОГ), блок управления и контроля (БУК) с первым входом и первым и вторым выходами, первый канал формирования сигналов (КФС), включающий первый делитель частоты (ДЧ), синтезатор частот (СЧ), умножитель частоты (УЧ), первый и второй управляемые коммутаторы (УК) и первый смеситель частот (СМЧ), а также второй КФС, включающий второй СМЧ, фазовый модулятор (ФМ) и амплитудный модулятор (AM), отличающийся тем, что БУК дополнительно снабжен вторым, третьим, четвертым, пятым, шестым и седьмым входами, а также третьим, четвертым, пятым, шестым, седьмым, восьмым и девятым выходами, первый КФС дополнительно снабжен первым блоком фазовой автоматической подстройки частоты (БФАПЧ), первым и вторым делителями мощности (ДМ), первым и вторым фильтрами низкой частоты (ФНЧ) и первым полосовым фильтром (ПФ), а второй КФС - вторым БФАПЧ, фазовращателем (ФВ), первой и второй нагрузками ...

СПОСОБ ФОРМИРОВАНИЯ ШУМОПОДОБНЫХ ФАЗОМАНИПУЛИРОВАННЫХ СИГНАЛОВ

Изобретение относится к области радиотехники и может быть использовано в системах радиосвязи с шумоподобными сигналами. Технический результат - повышение скорости передачи информации. Для этого способ состоит в том, что формируют две двоичные псевдослучайные последовательности максимальной длины, синхронизирующую (СП) и информационную (ИП). ИП удлиняют на один элемент и на каждом периоде повторения формируют две модулированные последовательности (МП1 и МП2) путем циклического сдвига ИП исходной длины на количество элементов, определяемое двумя очередными передаваемыми информационными символами, и добавлением постоянного элемента. МП1 и МП2 суммируют по модулю два с последовательностями, полученными задержкой СП на определенное количество тактовых интервалов. Одну из результирующих последовательностей мажоритарно суммируют с ИП и СП, а другую мажоритарно суммируют с ИП и поэлементно проинвертированной СП. Полученными сигналами осуществляют квадратурную модуляцию сигнала несущей частоты.

АППАРАТ И СПОСОБ ПЕРЕДАЧИ СИГНАЛА НА ОСНОВЕ МНОЖЕСТВА КАНАЛОВ

Изобретение относится к области связи и может быть использовано для передачи сигналов на основе множества каналов. Способ включает в себя этапы, на которых объединяют N групп символов модуляции низшего порядка в N групп символов модуляции высшего порядка, где iсимвол модуляции высшего порядка в каждой группе символов модуляции высшего порядка получается посредством объединения iсимволов модуляции низшего порядка во всех N группах символов модуляции низшего порядка, причем каждая группа символов модуляции низшего порядка включает в себя M символов модуляции низшего порядка, i=1, 2, …, M, N является положительным целым числом больше 1, и M является положительным целым числом больше 1; определяют N сигналов для отправки на основании N групп символов модуляции высшего порядка; и отправляют kсигнал, подлежащий отправке, из N сигналов, подлежащих отправке, посредством использования kканала из N каналов, где k=1, 2, …, N. Технический результат – повышение надежности передачи сигнала и возможность ...

УСТРОЙСТВО ПЕРЕДАЧИ ДЛЯ БЕСПРОВОДНОГО УСТРОЙСТВА, ИСПОЛЬЗУЮЩЕГО ДЕЛЬТА-СИГМА МОДУЛЯЦИЮ

СПОСОБ СНИЖЕНИЯ УРОВНЕЙ НЕОПРЕДЕЛЕННОСТИ ПЕРЕДАННЫХ СИМВОЛОВ

... 1. Способ передачи данных в системе цифровой связи, содержащий этапы, на которыхa) выбирают подмножество всех доступных состояний модуляции в заранее определенной схеме модуляции, подлежащей использованию для передачи,b) осуществляют первый этап передачи для передачи первого символа, представляющего первую совокупность битов, причем символ имеет первое состояние модуляции, содержащееся в подмножестве, иc) осуществляют, по меньшей мере, один дополнительный этап передачи для передачи добавочных символов, представляющих первую совокупность битов, причем каждый из добавочных символов имеет добавочное состояние модуляции, содержащееся в подмножестве, при этомсложение для каждой комбинации значений битов комплексных значений, связанных с первым и добавочными состояниями модуляции, дает одну и ту же фазу комплексного результата для всех комбинаций значений битов в совокупности битов.2. Способ по п.1, в котором сложение для каждой комбинации значений битов комплексных значений, связанных с первым ...

УСТРОЙСТВО И СПОСОБ ДЛЯ ПЕРЕДАЧИ/ПРИЕМА КОНТРОЛЬНЫХ СИГНАЛОВ В СИСТЕМЕ СВЯЗИ, ИСПОЛЬЗУЮЩЕЙ СХЕМУ МУЛЬТИПЛЕКСИРОВАНИЯ С ОРТОГОНАЛЬНЫМ ЧАСТОТНЫМ РАЗДЕЛЕНИЕМ КАНАЛОВ

... 1. Способ для передачи опорного сигнала для идентификации соты и сектора посредством, по меньшей мере, одной передающей антенны в системе связи, включающей в себя множество сот, причем каждая имеет, по меньшей мере, один сектор и, по меньшей мере, одну передающую антенну, способ содержит этапы, на которых: формируют первую часть последовательности, используя блочный код и код Уолша на основе идентификатора (ID) соты и ID сектора, после приема ID соты и ID сектора, при этом каждая из множества сот различается по своему уникальному ID соты, и каждый из секторов различается по своему уникальному ID сектора; выбирают вторую часть последовательности на основе ID соты и ID сектора среди множества последовательностей; формируют опорный сигнал частотной области с использованием первой части последовательности и второй части последовательности; и преобразуют опорный сигнал частотной области в опорный сигнал временной области посредством обратного быстрого преобразования Фурье (IFFT), и передают ...

СПОСОБ ПЕРЕДАЧИ УПРАВЛЯЮЩИХ СИГНАЛОВ В СИСТЕМЕ БЕСПРОВОДНОЙ СВЯЗИ

... 1. Способ передачи управляющих сигналов в системе беспроводной связи, причем управляющие сигналы содержатся в подкадре, содержащем два последовательных временных интервала, причем каждый временной интервал содержит множество символов с ортогональным частотным мультиплексированием (OFDM) во временной области, причем множество OFDM-символов разделено на множество OFDM-символов данных и множество OFDM-символов опорного сигнала (RS), причем множество OFDM-символов данных используется для передачи первого управляющего сигнала (CQI), и по меньшей мере один из множества OFDM-символов RS используется для передачи второго управляющего сигнала, причем способ содержит этапы, на которых: ! отображают первый управляющий сигнал на множество OFDM-символов данных после того, как первый управляющий сигнал расширяется базовой последовательностью в частотной области, ! отображают второй управляющий сигнал на по меньшей мере один из множества OFDM-символов RS; и ! одновременно передают первый управляющий сигнал ...

Способ расширения спектра сигналов

Изобретение относится к области радиотехники и может быть использовано в системах помехозащищенной передачи данных. Техническим результатом является повышение помехоустойчивости передачи данных. Предложен способ расширения спектра сигналов, который состоит в том, что формируют периодическую псевдослучайную последовательность импульсов (ПСП). На каждом периоде повторения ПСП формируют ее циклически сдвинутую копию. Разности значений циклических сдвигов ПСП на соседних периодах повторения ПСП выбирают во взаимно однозначном соответствии с передаваемыми информационными символами. Сигнал несущей частоты модулируют дополнительными передаваемыми информационными символами методом дифференциальной фазовой манипуляции (DPSK) с длительностью посылки, равной периоду повторения ПСП. Полученный сигнал манипулируют по фазе циклически сдвинутыми копиями ПСП. 1 ил.

Verfahren zur physische Kanalzuweisung und Sender

EINRICHTUNG UND VERFAHREN ZUR VERARBEITUNG EINES DIGITALEN DATENSIGNALS IN EINEM CDMA-FUNKSENDER

Verfahren zur Steuerungssignalerkennung mit Fehlerkalibrierung und Teilnehmereinheit dafür

Apparatus for radio telecommunications system and method of building up output power

Wireless communication methods and apparatus

Additional signalling for digital video broadcasting

TETRA communications system using a differential 8PSK (or D8PSK) modulation method

A modulation scheme for use in TETRA mobile communications systems that can provide an enhanced data transmission rate. The modulation scheme uses 3 f /8 differential phase shift keying, which encodes 3 bits per symbol. The modulation scheme uses a Grey code mapping in which each consecutive set of 3 bits is used to represent a phase change of +/- f /8, +/- 3 f /8, +/- 5 f /8, and +/- 7 f /8. The modulation scheme can be represented by:

S(k) = S(k-1)exp[jD D (k)]
S(0) = 1

where: S(k) is the kth symbol in the burst, k=1, 2, . . ., n, and n is the total number of symbols in the burst. The modulation scheme is used in standard TETRA channels (e.g. spacing, slot and frame structure) and at the standard TETRA symbol rate. The modulation scheme therefore provides an enhanced raw bit rate of 54000 bits/s (3 bits per symbol). The channels employing the normal DQPSK modulation can be used to signal the ...

Method of transmitting control signals in wireless communication system

A method of transmitting control signals in a wireless communication system includes multiplexing a first control signal with a second control signal in a slot, the slot comprising a plurality of orthogonal frequency division multiplexing (OFDM) symbols in time domain, the plurality of OFDM symbols being divided into a plurality of data OFDM symbols and a plurality of reference signal (RS) OFDM symbols, wherein the first control signal is mapped to the plurality of data OFDM symbols after the first control signal is spread by a base sequence in the frequency domain, the RS is mapped to the plurality of RS OFDM symbols, the second control signal is mapped to at least one of the plurality of RS OFDM symbols, and transmitting the first control signal and the second control signal in the slot.

Designing/modelling/creating a baseband stack using a virtual machine layer optimised for a communications DSP in order to emulate the baseband stack

A method of designing, modelling or creating a communications baseband stack, comprising the steps of creating a description of one or more of: resource requirements, capabilities or behaviour of the baseband stack, and using that description as an input to software comprising a virtual machine layer optimised for a communications DSP in order to generate an emulation of the baseband stack to be designed, modelled or fabricated. This allows a baseband stack to be created that runs on a virtual machine (CVM) and can be, preferably, incrementally ported to a real machine (target DSP). The virtual machine preferably allows low MIPS code to use it's API to interface with high MIPS processes, this in turn preferably allows underlying high MIPS algorithms (e.g. Viterbi decoding) to be accessible to high level (architecture neutral) low MIPS control flows (e.g. implementing GSM or UMTS protocols). Preferably complex low MIPS code is expressed, in part, by a non-realtime language such as SDL or ...

Method of ramping up output level of power amplifier of radio communication system,communication semiconductor integrated circuit,& radio communication system

Method of ramping up output level of power amplifier of radiocommunication system

For a radio communication system having a phase control loop for phase modulation and an amplitude control loop for amplitude modulation and being capable of time divisional transmission and reception under a predetermined time management, a control method is provided which can lower and ramp up the output level of a power amplifier (200) within a predetermined time when a transmission mode is switched. When transmission in a first mode is switched to transmission in a second mode or when transmission in the second mode is switched to transmission in the first mode, the output level of the power amplifier is lowered once to a predetermined level higher than the level when transmission related circuits are activated, and thereafter the output level of the power amplifier is again ramped after the settings have been changed but with continuous operation of a transmission oscillator, TxVCO the phase control loop and the amplitude control loop.

Method of transmitting control signals in wireless communication system

Radio transmitters and methods of operation

Method, apparatus and computer program for transmitting and/or receiving signals across an electric power grid

CDMA SYSTEM, WHICH USES A VORDREHUNG BEFORE SENDING

PROCEDURE AND SYSTEM FOR THE GENERATION OF LOW DENSITY PARITY CHECK (LDPC) CODE

MODULATOR WITH IMMEDIATE MODULATION PATTERN CHANGE WITH MULTIPLE TIME SLOT AND MULTIPLE MODE ENTERPRISE FOR A WIRELESS COMMUNICATION DEVICE

MODULATION PATTERN FOR TETRA SYSTEMS

CODING OF LDPC CODES (LOW DENSITY PARITY CHECK) BY USE OF A STRUCTURED PARITY TEST MATRIX

MODULATION PROCEDURE FOR A TETRA COMMUNICATION SYSTEM

PHASE-LOCKED LOOP MODULATOR WITH CORRECTION OF THE REINFORCEMENT OF THE MODULATION SIGNAL

Modulation of Signal Field in a WLAN Frame Header

A plurality of training fields of a preamble of a physical layer data unit are generated, and training fields of the plurality of training fields are mapped to respective signal streams of a plurality of streams using a mapping matrix. A signal field of the preamble of the data unit is generated, and the signal field is mapped to the plurality of signal streams using a column of the mapping matrix. The plurality of signal streams are mapped to a plurality of spatial streams, and at least i) the plurality of training fields and ii) the signal field are transmitted via the plurality of spatial streams.

Method, apparatus, and system for microwave signal correction

A method, an apparatus, and a system are provided in various embodiments of the present invention. According to embodiments of the present invention, the receiver samples the frequency signal from the transmitter to obtain sampling data and obtain the feedback IQ signal from the sampling data, and performs signal correction by using the feedback IQ signal. Sampling the received radio frequency signal does not need an additional component. The receiving channel installed in the receiver can be used to receive the radio frequency signal, which reduces the cost and power consumption.

System and method for joint voice and data transmission

A method for multiplexing voice and data communication using a communications network is presented. In the method, at least one voice bit from a voice bit stream is retrieved, and at least one data bit from at least one data bit stream is retrieved. When the voice bit stream is not in a discontinuous transmission (DTX) period, the at least one voice bit and the at least one data bit are used to generate a modulated symbol. The method includes transmitting the modulated symbol using the communications network.

Signaling method and apparatus to enable multiple antenna communications in wireless systems

A method ( 200 ) for signaling a transmission mode in a wireless communication networks comprises selecting a signature sequence corresponding to the transmission mode of a transmitting device (S 210 ); forming, for each antenna in the transmitting device, a synchronization field based on the selected signature sequence, wherein the synchronization field is included in a preamble (S 220 ); and transmitting, from each antenna in the transmitting device, the data frame that comprises the preamble.

QAM and GMSK Modulation Methods

Filtering and modulating a first bit rate signal into a Gaussian filtered Gaussian Minimum Shift Keyed (GMSK) modulated signal and a second bit rate signal into a Quadrature Amplitude Modulated (QAM) signal. A method for nonlinearly and linearly amplifying GMSK and QAM signals. A diversity receiver and demodulator method for receiving and demodulating transmitted modulated signals. Processing, transmit baseband filtering and modulating signals for providing cross-correlated in-phase and quadrature-phase Gaussian filtered Gaussian Minimum Shift Keying (GMSK) and other cross-correlated modulated signals and spread spectrum Quadrature Phase Shift Keying (QPSK) modulated signals. Transmit processing and filtering for providing time division multiplexed (TDM) Gaussian filtered baseband signal and Orthogonal Frequency Division Multiplexed (OFDM) in-phase and quadrature-phase baseband modulated signal to a cellular network and to separate wireless network. Diversity receiver and demodulator method with multiple antennas for providing demodulated cross-correlated in-phase and quadrature-phase filtered signals.

Efficient high performance demodulation of low bt value gaussian minimum shift keying incorporating turbo equalization

Systems ( 600 ) and methods ( 100 ) for demodulating a Gaussian Filtered Minimum Shift Keyed (GMSK) signal. The GMSK signal is defined in a transmitted symbol domain where each symbol is given by a product of a current data bit and a previous data bit. The GMSK signal is converted from the transmitted symbol domain to a data symbol domain. The conversion is achieved by approximating filtered complex output signals that would be produced by matched filters having filter shapes corresponding to pulses used in terms of a Laurent expansion. Subsequent to the convention of the GMSK signal, a trellis equalization of the GMSK signal is performed exclusively in the data symbol domain based on the terms of the Laurent expansion.

Channel state information transmission method appraratus and system

A precoding method, a precoding apparatus, a Frequency Domain Equalization (FDE) method, and an FDE apparatus are provided in the embodiments of the present invention. The precoding method includes: performing offset modulation for a transmitting signal vector; calculating a precoding matrix according to the offset-modulated transmitting signal vector and a receiver decision signal vector, where the precoding matrix is used for performing precoding for the transmitting signal vector; and performing precoding for the transmitting signal vector according to the precoding matrix. Linear precoding is performed by using the offset-modulated signal on the transmitter, and therefore, the interference caused by multiple antennas and multipath propagation is reduced, the system BER is reduced, and the complexity of implementation is low.

Quadrature communications device with power combiner and related methods

A communications device may include In-phase (I) power amplifiers configured to generate I amplified signals, Quadrature (Q) power amplifiers configured to generate Q amplified signals, an I controller coupled to the I power amplifiers and configured to selectively enable some of the I power amplifiers, and a Q controller coupled to the Q power amplifiers and configured to selectively enable some of the Q power amplifiers. The communications device may also include a power combiner configured to combine the I amplified signals and the Q amplified signals in a combined amplified signal, and an antenna coupled to the power combiner.

Power Amplification Based on Phase Angle Controlled Frequency Reference Signal and Amplitude Control Signal

Methods and systems for vector combining power amplification are disclosed herein. In one embodiment, a plurality of signals are individually amplified, then summed to form a desired time-varying complex envelope signal. Phase and/or frequency characteristics of one or more of the signals are controlled to provide the desired phase, frequency, and/or amplitude characteristics of the desired time-varying complex envelope signal. In another embodiment, a time-varying complex envelope signal is decomposed into a plurality of constant envelope constituent signals. The constituent signals are amplified equally or substantially equally, and then summed to construct an amplified version of the original time-varying envelope signal. Embodiments also perform frequency up-conversion.

Blind symbol synchronization scheme for ofdm system

An Orthogonal Frequency Division Multiplexing (OFDM) receiver system for improved pilotless detection of symbol boundary of a received OFDM symbols using M-ary Phase Shift Keying (M-PSK) modulated carriers as a cost function is provided. The OFDM receiver includes a symbol boundary detection block that detects a symbol boundary of the received OFDM symbols. The symbol boundary detection block detects the symbol boundary by computing cost function of second order moment of the M-PSK modulated carriers. The receiver system is capable of detecting the symbol boundary for unknown information on said received OFDM symbols and thus increases throughput per given transmission bandwidth of a modulation scheme.

Four-dimensional non-binary ldpc-coded modulation schemes for ultra high-speed optical fiber communication

Systems and methods are disclosed for communicating signals, by receiving a K-symbol-long input block from a 2 m -ary source channel; encoding the input block into a 2 m -ary non-binary low-density parity-check (LDPC) codeword of length N; and mapping each 2 m -ary symbol to a point in a signal constellation comprised of 2 m points, wherein a non-binary LDPC code is used as the component code for forward error correction in a coded modulation scheme capable of achieving optical fiber communication at rates beyond 100 Gb/s.

Mobile wireless communications device with separate in-phase (i) and quadrature (q) phase power amplification and power amplifier pre-distortion and iq balance compensation

A communications device, in one aspect as a portable wireless communications device, includes an in-phase modulator and power amplifier that receives a baseband I signal and modulates and amplifies the I signal. A quadrature modulator and power amplifier receives a baseband Q signal and modulates and amplifies the Q signal. A power combiner sums and outputs the I and Q signals. An I demodulator circuit receives a signal fed back from the I power amplifier and demodulates the fed back signal to produce demodulated I signals. A Q demodulator circuit receives a signal fed back from the Q power amplifier and demodulates the fed back signal to produce demodulated Q signals. A processor compares the digital, baseband I and Q signals with a demodulated I and Q signals to compensate for amplitude, frequency and phase modulation errors.

Generation of Optical Quadrature Duobinary Format Using Optical Delay

An optical method for generating an optical quadrature duobinary QDB signal includes receiving a quadrature phase-shift-keying QPSK signal, and adding a delay to the received quadrature phase-shift-keying QPSK signal to generate an optical quadrature duobinary signal.

Optical differential phase-shift keyed signal demodulator

A phase-shift keyed signal demodulator and method for demodulating is disclosed. An example demodulator includes N filters that receive inputs from a splitter and include transmission functions offset from one another. N pairs of photodiodes receive the transmitted and reflected beams from each filter and a decoder converts the outputs of the pairs of photodiodes to one or more data symbols.

Ship Based Cellular and Satellite Communication

A ship based cellular and satellite transceiver receives, demodulates and processes data, voice and video signals from a satellite transmitter and provides the processed signals in cascade to a OFDM and to a CDMA modulator and transmitter for transmission to a ship based mobile unit. The OFDM signal is transmitted in a Wi-Fi network and the CDMA signal is transmitted in frequency bands used by cellular phones and cellular connected devices. The ship based transceiver receives from a mobile unit, e.g. from a cellular phone or a computer an OFDM or a CDMA signal generated and transmitted by the mobile unit and receives, demodulates and processes the cellular phone transmitted signal and provides these processed signals for cascade processing, modulation and transmission to a satellite.

Apparatus and method of transmitting preamble having additional information in differential modulation packet data communication

Apparatus and method of transmitting a preamble having additional information in differential modulation packet data communication. The apparatus includes a phase rotator that outputs a phase rotation quantity corresponding to additional information to be applied to a transmission target packet, a transmission-multiplier that multiplies the phase rotation quantity output from the phase rotator by a preamble to be transmitted, a symbol mapper that converts header and payload data to be applied to the transmission target packet into symbols and outputs the same, a multiplexer that processes an output signal of the transmission-multiplier and an output signal of the symbol mapper to be selectively output through an output end to form a symbol stream in units of packets, and a differential symbol converter that converts the symbol stream output from the multiplexer according to a predetermined differential modulation method and outputs the converted symbol stream.

Radio transmitter system and method

A radio transmitter system responsive to a binary signal drives a narrow bandwidth VLF or LF antenna. A generator derives a first variable frequency wave frequency coded based on bit values of a binary signal. An arbitrary impulse response signal processor responsive to the first wave derives a first output signal having real and imaginary components representing the shape of a modulating wave having a variable amplitude envelope and the frequency of the coded values. A transmitter responsive to the processor output signal and a VLF or LF carrier supplies the antenna with another output signal including a modulation wave having a shape that is a substantial replica of the modulating wave shape. The processor causes the signal emitted by the antenna system to include modulation having a shape that is substantially the shape of the first wave.

Transmitting device, receiving device and communication method for an ofdm communication system with new preamble structure

A transmitting device, a receiving device, and a communication method for transmitting and receiving data modulated on frequency subcarriers of an OFDM communication system. An OFDM burst includes a preamble part and payload data part, whereby the preamble includes a section of pilot symbols mapped onto every n-th frequency subcarrier and signaling data mapped onto the frequency subcarriers between the frequency subcarriers with the pilot symbols. A first channel estimation on the basis of the received pilot symbols is performed, the result of which is used to reconstruct the entire section of the received preamble as a training pattern for an accurate channel estimation, which is used for a channel equalization of the received payload part.

Optical modulator

Disclosed is an optical modulator which substantially lowers loss and has little attenuation in the intensity of an optical signal after modulation. The optical modulator includes a 1×2 RZ pulse carver wherein optical phase shifters used for modulation are arranged along two arm waveguides held between a 1×2 coupler and a 2×2 coupler, two interferometric modulators connected respectively to two output ports of the 2×2 coupler, and a 2×1 coupler for combining the outputs of the interferometric modulators.

Electrical Modulator Driver Circuit for Generating Multi-Level Drive Signals for QAM Optical Transmission

An apparatus and methods for generating multi-level output signals for use by an optical modulator are provided. The apparatus comprises a plurality of input signal lines each configured to receive a binary input signal, an output signal line and a plurality of amplifier stages. The amplifier stages are each connected between one of the input signal lines and the output signal line so as to each produce an output voltage on the output signal line of either a first level or a second level. The level of the output voltage is based on the binary signal at the respective input signal line, and the output voltages of the respective plurality of amplifier stages collectively produce a summed analog output voltage on the output signal line at two or more different levels each configured to drive an optical modulator.

Signal generating method and apparatus

A signal generating method and apparatus in the field of signal technologies are provided. The method includes: adjusting an incident angle of an optical signal entering a polarization beam splitter, so that the polarization beam splitter outputs a first optical signal and a second optical signal that have a preset power ratio; performing QPSK modulation on the first and second optical signal respectively by using a first and second externally input data streams, to obtain a first and a second QPSK optical signal; before the first QPSK optical signal and the second QPSK optical signal are input into a polarization beam combiner, adjusting a polarization state of the first or the second QPSK optical signal; when the polarization states of the two QPSK optical signals are the same, outputting a 16QAM signal; and when the polarization states of the two QPSK optical signals are orthogonal, outputting a DP-QPSK signal.

METHOD AND APPARATUS FOR CONSTANT ENVELOPE MODULATION

Certain aspects of the present disclosure relate to a method for modulating single carrier signals using constant envelope 2-CPM modulation and quasi-constant envelope filtered continuously rotated pseudo-PSK modulation in a wireless communication system. 1{'sub': 2', '4, 'encoding a binary data stream using one of a continuously rotated differential pseudo BPSK (πh-DPBPSK) encoding and a continuously rotated generalized differential pseudo QPSK (πh-GDPQPSK) encoding; and'}filtering the encoded binary data stream to produce a quasi-constant envelope modulated signal.. A method for communication, comprising: This application is a continuation of U.S. patent application Ser. No. 12/480,689, filed Jun. 9, 2009, and titled “Method and Apparatus for Constant Envelope Modulation,” which is incorporated herein by reference in its entirety as if set forth in full.1. FieldCertain aspects of the present disclosure generally relate to constant envelope spread-spectrum coding and, more particularly, to a method for modulating a continuous phase modulated (CPM) signal.2. BackgroundSpread-spectrum coding is a technique by which signals generated in a particular bandwidth can be spread in a frequency domain, resulting in a signal with a wider bandwidth. The spread signal has a lower power density, but the same total power as an un-spread signal. The expanded transmission bandwidth minimizes interference to others transmissions because of its low power density. At the receiver, the spread signal can be decoded, and the decoding operation provides resistance to interference and multipath fading.Spread-spectrum coding is used in standardized systems, e.g. GSM, General Packet Radio Service (GPRS), Enhanced Digital GSM Evolution (EDGE), Code Division Multiple Access (CDMA), Wideband Code Division Multiple Access (WCDMA or W-CDMA), Orthogonal Frequency Division Multiplexing (OFDM), Orthogonal Frequency Division Multiple Access (OFDMA), Time Division Multiple Access (TDMA), Digital ...

Phase Shift Keying Transmitter Circuit

A phase shift keying transmitter circuit that includes: a variable frequency conversion stage adapted to receive a first data signal, wherein the variable frequency conversion stage comprises a plurality of frequency modulating elements, wherein the first data signal controls the number of the plurality of frequency modulating elements that are operated so as to control an operating frequency of the variable frequency conversion stage; and an output stage configured to switch between one of two possible outputs, the signals provided by one of the two possible outputs having an opposite polarity to the other, wherein the output stage is configured to receive a second data signal to control the switching between the two possible outputs, wherein the output stage is coupled to the variable frequency conversion stage and wherein the switching between the two possible outputs changes the phase of a signal from the variable frequency conversion stage by 180°. 1. A phase shift keying transmitter circuit comprising:a variable frequency conversion stage adapted to receive a first data signal, wherein the variable frequency conversion stage comprises a plurality of frequency modulating elements, wherein the first data signal controls the number of the plurality of frequency modulating elements that are operated so as to control an operating frequency of the variable frequency conversion stage; andan output stage configured to switch between one of two possible outputs, the signals provided by one of the two possible outputs having an opposite polarity to the other, wherein the output stage is configured to receive a second data signal to control the switching between the two possible outputs, wherein the output stage is coupled to the variable frequency conversion stage and wherein the switching between the two possible outputs changes the phase of a signal from the variable frequency conversion stage by 180°.2. The phase shift keying transmitter circuit of claim 1 , wherein ...

NON-CONTIGUOUS SPECTRAL-BAND MODULATOR AND METHOD FOR NON-CONTIGUOUS SPECTRAL-BAND MODULATION

Embodiments of a non-contiguous spectral-band modulator and method for non-contiguous spectral-band modulation are generally described herein. In some embodiments, an input symbol tuple may be mapped to a sequence of phase values. Each value of the sequence of phase values may represent an instantaneous frequency of a waveform for a signal with a power spectral density that is substantially constrained to the two or more subbands of a non-contiguous spectrum. The values of the sequence of phase values may be accumulated and a phase-sample sequence representing phase samples of a transmit waveform may be generated. An exponentiation may be performed on the phase-sample sequence to generate a constant modulus signal sequence. An output signal sequence is generated that is constrained to a region in the complex plane, such as an annulus, when the signal is in a subband. The output signal sequence may be shaped to constrain spectral energy during transitions between subbands. 1. A non-contiguous spectral-band modulator for transmitting a waveform within two or more subbands of a non-contiguous spectrum , the modulator comprising:a signal-trajectory memory to map an input symbol tuple to a sequence of phase values, each value of the sequence of phase values representing an instantaneous frequency of a waveform for a signal with a power spectral density that is substantially constrained to the non-contiguous spectrum;a numerically-controlled-oscillator (NCO) component to accumulate the values of the sequence of phase values and to generate a phase-sample sequence representing phase samples of a transmit waveform;a complex exponential element to perform an exponentiation on the phase-sample sequence and to generate a constant modulus signal sequence; anda variable gain component to multiply the constant modulus signal sequence by a weighting sequence to generate an output signal sequence, the output signal sequence being constrained to a region in a complex plane while in ...

DISTRIBUTED ANTENNA SYSTEM FOR MIMO SIGNALS

A distributed antenna system includes a multiple-input and multiple-output (MIMO) base station configured to output at least a first signal and a second signal. At least one master unit communicates with the MIMO base station. At least one remote unit communicates with the master unit. At least one antenna is coupled with the remote unit for receiving signals from the remote unit. A hybrid coupler is coupled between the remote unit and antenna and is configured to receive the first signal Ch and the second signal Ch from the remote unit on respective first and second ports and to provide an output signal on at least one output port. The output signal includes at least a portion of the first signal and at least a portion of the second signal. The antenna is coupled with the output port. 1. A system comprising:a multiple-input and multiple-output (MIMO) signal configured to output a first branch of a MIMO signal and at least a second branch of the MIMO signal, the branches of the MIMO signal being in the same frequency channel;at least one master unit and a respective plurality of remote units coupled with the master unit, the at least one master unit coupled with the MIMO signal and configured for distributing signals to one or more remote units;at least another master unit and another respective plurality of remote units coupled with the another master unit, the another master unit coupled with the MIMO signal and configured for distributing signals to one or more remote units;a hybrid coupler coupled to receive the first branch of the MIMO signal and the second branch of the MIMO signal on respective first and second input ports and configured to provide output signals on first and second output ports, the output signal on the first output port including at least a portion of the first branch of the MIMO signal and at least a portion of the second branch of the MIMO signal that is phase shifted orthogonally in relation to the respective second branch of the MIMO ...

Transceiver Architecture and Methods for Demodulating and Transmitting Phase Shift Keying Signals

A transceiver is described. The transceiver includes a first injection-locked oscillator and a second injection-locked oscillator. The transceiver also includes a first phase-locked loop coupled with the first injection-locked oscillator. The first phase-locked loop is configured to generate a first frequency reference. Further, the transceiver includes a second phase-locked loop coupled the second injection-locked oscillator. The second phase-locked loop is configured to generate a second frequency reference. The transceiver includes a mixer configured to receive the first phase-locked loop output and configured to receive said second injection-locked oscillator output. The mixer is also configured to generate a carrier frequency signal based on the first injection-locked oscillator output and the second injection-locked oscillator output. And, the transceiver includes a modulator configured to receive said carrier frequency signal. 1. A transceiver comprising:a first injection-locked oscillator having a first input configured to receive a binary phase shift keying (“BPSK”) signal and a second input configured to receive a first frequency reference, said first injection-locked oscillator configured to generate a first injection-locked oscillator output;a second injection-locked oscillator having a third input configured to receive said BPSK signal and a fourth input configured to receive a second frequency reference, said second injection-locked oscillator configured to generate a second injection-locked oscillator output;a first phase-locked loop coupled with said second input of said first injection-locked oscillator, said first phase-locked loop configured to generate said first frequency reference;a second phase-locked loop coupled with said fourth input of said second injection-locked oscillator, said second phase-locked loop configured to generate said second frequency reference;a mixer configured to receive said first phase-locked loop output and configured ...

Multiple input multiple output transmission method in a digital video broadcasting system and device for supporting same

Provided is a Multiple Input Multiple Output (MIMO) transmission method in a digital broadcasting system. The method includes generating a plurality of first modulation symbols by modulating first information bits; generating a plurality of second modulation symbols by modulating second information bits; generating a plurality of first pre-coded symbols and a plurality of second pre-coded symbols by pre-coding the plurality of first modulation symbols and the plurality of second modulation symbols; and allocating the plurality of first pre-coded symbols and the plurality of second pre-coded symbols staggeringly through a first antenna and a second antenna and transmitting them.

Power line communication system

A power line communication system is provided in which the influence of the impulsive noise unexpectedly generated on a power line which is a communication medium can be reduced according to the characteristics of the impulsive noise by an existing method and power line communication can be realized without a hindrance. A transmitter is constituted by: a modulator for conveying a LIN data signal by a power line; a filter that allows a signal of a predetermined band to pass therethrough; and a sinusoidal wave outputter (sinusoidal wave in the figure). In contrast, the receiver is constituted by the sinusoidal wave outputter, the filter and a demodulator that performs demodulation. To the power line, a limiter that limits the amplitude of the propagating signal to a predetermined amplitude (reception signal amplitude) is connected.

Method and apparatus to use auxiliary receiver to compensate multiple transmitters based upon one of the transmitters

A communications device includes a plurality of wireless transmitters operable at different respective frequencies and each configured to generate respective IQ signals having an initial IQ imbalance. An auxiliary receiver is coupled to a given wireless transmitter. In addition, a controller is configured to apply predistortion to the each wireless transmitter of the plurality thereof based upon the initial IQ imbalance generated by the given wireless transmitter to reduce the initial IQ imbalance in each wireless transmitter.

Optical network unit, optical access network and a method for exchanging information

An Optical Access Network, a Optical Network Unit (ONU) and various methods for exchanging information are provided. The method may include: receiving, by the ONU, a pilot signal and downstream information signals; wherein the pilot signal is received at a pilot frequency slot and the downstream information signals are received at a downstream information frequency slot; wherein the ONU is allocated with a spectral slice that comprises the pilot frequency slot, the downstream information frequency slot, a guard frequency slot and an upstream information frequency slot; wherein at least one other spectral slice is allocated for exchanging information with at least one other group of ONUs; splitting the downstream information signals to downstream information signals portions; splitting the pilot signals to pilot signals portions; detecting downstream information, in response to at least a first portion of downstream information signals; modulating a portion of the pilot signal by upstream information signals to provide upstream information signals that are within the upstream information frequency slot; modulating a second portion of the downstream information signals by the upstream information signals to provide upstream secondary signals that are outside the pilot frequency slot, the downstream information frequency slot and the upstream information frequency slot; and upstream transmitting the upstream information signals and the upstream secondary signals.

Digital wideband closed loop phase modulator with modulation gain calibration

One embodiment of the present invention relates to a modulation system having a phase locked loop and an adaptive control. The phased lock loop is configured to receive an input signal and an adaptive signal. The input signal is an unmodulated signal, such as a phase component or phase signal. The phase locked loop is also configured to provide an error signal and an output signal. The error signal indicates one or more modulation errors. The output signal is a modulated version of the input signal that has been corrected using the adaptive signal to mitigate the one or more modulation errors.

PHASE DETECTOR

Described are a method for generating a metric that is a function of a phase difference between a modulated carrier and a local carrier, and a phase detector for performing such a method. A baseband symbol is obtained from the modulated carrier, and the phase of the symbol is determined. Assuming that the modulation used to modulate the modulated carrier has a constellation diagram with M-fold rotational symmetry, the metric can be generated from the phase by evaluating a base function that includes a triangle wave having positively and negatively sloped linear segments whose slopes have identical absolute values and that is periodic with a period of 2π/M radians. Alternatively or additionally, if the ideal symbol phases are uniformly distributed, the metric can be generated by evaluating a version of the base function in which the ideal symbol phases correspond to identically valued metrics located on the triangle wave. 153-. (canceled)54. A method for generating a metric that is a function of a phase difference between a modulated carrier and a local carrier , the method comprising:(a) obtaining a baseband symbol from the modulated carrier that is modulated using the symbol according to a modulation whose constellation diagram has M-fold rotational symmetry, wherein M is a positive integer greater than or equal to 2;(b) determining a received phase of the symbol; and(c) generating the metric from the received phase, wherein possible metrics depend on possible received phases according to a base function that comprises a triangle wave having positively and negatively sloped linear segments whose slopes have identical absolute values and that is periodic with a period of 2π/M radians.55. A method for generating a metric that is a function of a phase difference between a modulated carrier and a local carrier , the method comprising:(a) obtaining a baseband symbol from the modulated carrier that is modulated using the symbol according to a modulation order (M) ...

METHOD AND APPARATUS FOR DATA TRANSMISSION USING MULTIPLE TRANSMIT ANTENNAS

A method and apparatus for increasing the data rate and providing antenna diversity using multiple transmit antennas is disclosed. A set of bits of a digital signal are used to generate a codeword. Codewords are provided according to a channel code. Delay elements may be provided in antenna output channels, or with suitable code construction delay may be omitted. n signals represent n symbols of a codeword are transmitted with n different transmit antennas. At the receiver MSLE or other decoding is used to decode the noisy received sequence. The parallel transmission and channel coding enables an increase the data rate over previous techniques, and recovery even under fading conditions. The channel coding may be concatenated with error correction codes under appropriate conditions. 1. An encoder , comprising: employ a code structure with branches where the branches of the code structure have labels that correspond to sets comprising of n symbols that are elements of a signal constellation;', 'select a branch of the code structure based on input data, and a previous state of the encoder; and', 'transmit a set of the sets of n symbols of the signal constellation that corresponds to a branch label of the branch that is selected, over a plurality of n antennas simultaneously., 'a processor configured to2. The encoder of claim 1 , wherein the branch is selected by selecting claim 1 , at each time t claim 1 , branches of a form qq. . . q.3. The encoder of claim 1 , wherein the encoder transmits using phase shifts of a carrier.4. The encoder of claim 1 , wherein the encoder delays a transmission of at least one symbol by a predetermined time delay.5. The encoder of claim 1 , wherein the code structure comprises a space-time code.6. The encoder of claim 1 , wherein the encoder converts each of the n symbols into baseband signals and multiplies each of the baseband signals by a selected claim 1 , respective claim 1 , PN bit sequence.7. The encoder of claim 6 , wherein a ...

Transmitters and Methods

A transmitter comprises a baseband signal path, which is designed to provide a first baseband signal having an in-phase component and a quadrature component in a first mode of the transmitter and to provide a second baseband signal having an amplitude component and a phase component in a second mode of the transmitter; an oscillator circuit, which is designed to provide an oscillator signal, wherein the oscillator circuit is furthermore designed to provide the oscillator signal as an unmodulated signal in the first mode and to provide the oscillator signal as a modulated signal in the second mode, wherein a modulation of the oscillator signal in the second mode is based on the phase component of the second baseband signal; and a radio-frequency digital-to-analogue converter (RF-DAC), which is designed to receive the oscillator signal, the first baseband signal and the amplitude component of the second baseband signal, wherein the RF-DAC is furthermore designed to provide the vector-modulated RF output signal on the basis of the first baseband signal and the oscillator signal in the first mode and to provide the polar-modulated RF output signal on the basis of the amplitude component of the second baseband signal and the oscillator signal in the second mode.

Wideband Phase Modulation Methods and Apparatus

A wideband phase modulator comprises a multiphase generator, a phase selector, and a phase adjuster. The wideband phase modulator is configured to receive an N-bit digital phase-modulating signal comprising a timed sequence of N-bit phase-modulating words, where N is a positive integer representing the bit resolution of the N-bit digital phase-modulating signal. The multiphase generator generates a plurality of coarse carrier phases, all having the same carrier frequency but each offset in phase relative to the other. The M most significant bits of the N-bit phase-modulating words are used to form M-bit phase select words that control the output phase of the phase selector. The phase adjuster performs a precision rotation operation, whereby a selected coarse carrier phase is adjusted so that the phase of the resulting final precision phase-modulated signal more closely aligns with a desired precision phase. 1. A wideband phase modulator , comprising:a multiphase generator configured to generate a plurality of coarse carrier phases;a phase selector configured to select from among said plurality of coarse carrier phases; anda phase adjuster configured to adjust the phase of a selected coarse carrier phase from a coarse phase to a precision phase,wherein the coarse phase modulation provided by said multiphase generator and said phase selector is performed without using feedback.2. The wideband phase modulator of claim 1 , wherein said phase adjuster is configured to adjust the phase of said selected coarse carrier phase without using feedback.3. The wideband phase modulator of claim 1 , wherein said multiphase generator comprises a wave-based oscillator.4. The wideband phase modulator of claim 1 , wherein said phase adjuster comprises a quadrature modulator.5. The wideband phase modulator of claim 4 , wherein said multiphase generator and said phase selector together serve as a local oscillator for said quadrature modulator.6. A method of modulating the phase of a ...

Method and apparatus for channel estimation

Methods and apparatuses for channel estimation are disclosed. The method includes: converting −1's in a local Barker code to 0's; receiving a first preamble symbol output from a first Barker correlator and a second preamble symbol output from a second Barker correlator with a symbol determination module, the first preamble symbol being adjacent to the second preamble symbol; multiplying a result output from the symbol determination module with a correlation result output from the cyclic Barker correlator by using a multiplication module so as to obtain a channel estimation response; and receiving channel estimation responses with a time-domain channel data storage unit, and averaging them to obtain a noise-reduced channel estimation response. The channel estimation method and apparatus of the present invention can be achieved based on few hardware resources and low computation complexity.

Apparatus and method of transmitting hierarchically modulated signal

An apparatus and a method of transmitting hierarchically modulated signals are provided. The present invention includes: a basic layer symbol generator generating a first layer signal; an enhancement layer symbol generator generating a second layer signal synchronized with the first layer signal and having different signal power; and a hierarchical modulator hierarchically modulating the first layer signal and the second layer signal, wherein the enhancement layer symbol generator performs constellation rotation rotating bundles configured as constellation points formed by the second layer signal based on constellation points of the first layer signal by a predetermined angle. According to the exemplary embodiment of the present invention, it is possible to improve the receiving performance of the second layer signals by applying the constellation rotation technology to the second layer signals in regards of the signal transmission system using the hierarchical modulation technology.

METHOD OF MODULATING SIGNAL FOR DATA COMMUNICATION AND DEVICE THEROF

The present invention relates to a method for modulating a signal, which is a signal modulation method for data communication, and the method comprises the steps of: forming a data symbol sequence to which a symbol 0 having the overall length of N are added, by adding M−1 symbols 0 to each symbol of a data symbol sequence; performing an N-point fast Fourier transform for the data symbol sequence to which said symbols 0 are added; performing precoding for said fast-Fourier-transformed data symbol sequence; and forming a final transmission symbol sequence by performing an inverse fast Fourier transform for said precoded data symbol sequence. Further, the present invention relates to a transmitter which comprises: a symbol adding unit that forms a data symbol sequence to which the symbol 0 having the overall length of N is added, by adding M−1 symbols 0 to each symbol of a data symbol sequence; a fast Fourier transform unit that performs an N-point fast Fourier transform for the data symbol sequence to which said symbols 0 are added; a precoding unit that performs precoding for said fast-Fourier-transformed data symbol sequence; and an inverse fast Fourier transform unit that forms a final transmission symbol sequence by performing an inverse fast Fourier transform for said precoded data symbol sequence. 1. A signal modulation method for data communication comprising:adding (M−1) zero symbols to each symbol of a data symbol sequence, and forming a data symbol sequence to which a zero symbol (i.e., 0 symbol) having a total length of N is added;performing an N-point FFT process on the data symbol sequence to which the zero symbol is added;precoding the FFT-processed data symbol sequence; andforming a final transmission symbol sequence by performing an IFFT on the precoded data symbol sequence.2. The method according to claim 1 , wherein the forming the data symbol sequence to which the zero symbol is added includes:divisionally adding the (M−1) zero symbols to a front ...

Mobile wireless communications device with separate in-phase (i) and quadrature (q) phase power amplification and power amplifier pre-distortion and iq balance compensation

A communications device, in one aspect as a portable wireless communications device, includes an in-phase modulator and power amplifier that receives a baseband I signal and modulates and amplifies the I signal. A quadrature modulator and power amplifier receives a baseband Q signal and modulates and amplifies the Q signal. A power combiner sums and outputs the I and Q signals. An I demodulator circuit receives a signal fed back from the I power amplifier and demodulates the fed back signal to produce demodulated I signals. A Q demodulator circuit receives a signal fed back from the Q power amplifier and demodulates the fed back signal to produce demodulated Q signals. A processor compares the digital, baseband I and Q signals with a demodulated I and Q signals to compensate for amplitude, frequency and phase modulation errors.

Systems and methods for fast and precise frequency estimation

Systems and methods are provided for fast and precise estimation of frequency with relatively minimal sampling and relatively high tolerance to noise.

Wireless communication system, wireless communication apparatus, wireless communication method, and computer program

Random access operation is performed under a communication environment in which a plurality of communication modes having different transmission rate coexist with small overhead. A high-grade communication station spoofs information of a packet length and a rate in a decoding portion so that a value of (packet length)/(rate) corresponds to a duration where the communication is hoped to be stopped. The other station receiving the spoofed information receives the rest of the packet with the designated rate during the interval designated by the value of (packet length)/(rate). In this case, the packet length and the rate are not those of actually transmitted packet so that this packet is discarded.

Signal Transmitting Device and Phase Modulated Method for Transmitting via a Signal Transmitting Device

A signal transmitting device and a method for transmitting via a signal transmitting device is disclosed. In one embodiment the transmitting device comprises a first resonant circuit with a resonant circuit inductance and a resonant circuit capacitance and a second resonant circuit with a resonant circuit inductance and a resonant circuit capacitance, a coupling element which couples the first resonant circuit to the second resonant circuit, a first excitation circuit, coupled to the first resonant circuit, and at least one further excitation circuit coupled to the second resonant circuit. 1. A circuit comprising:a first resonant circuit having a resonant circuit inductance and a resonant circuit capacitance, and a second resonant circuit having at least one a resonant circuit capacitance;a coupling element coupling the first resonant circuit to the second resonant circuit;a first excitation circuit coupled to the first resonant circuit, and at least one further excitation circuit being coupled to the second resonant circuit;a second excitation circuit coupled to the first and second resonant circuit;at least one first inductive component being coupled inductively to the resonant circuit capacitance of the first resonant circuit;at least one second inductive component being coupled inductively to the resonant circuit capacitance of the second resonant circuit,wherein the first excitation circuit and the second excitation circuit are configured to excite the first resonant circuit and the second resonant circuit into phase-shifted oscillations with a phase shift not equal to zero.2. The circuit of wherein the first excitation circuit and the further excitation circuit are configured to excite the first and second resonant circuit into antiphase oscillations.3. The circuit of claim 1 , further comprising:a first transformer having a primary winding and a secondary winding, with the primary winding of said first transformer forming the resonant circuit inductance of ...

Forward error correction for an optical transport system

An optical transport system that transmits data using relatively short FEC-encoded data frames. The corresponding modulated optical signals are decoded at an optical receiver using frame-based maximum likelihood sequence estimation that relies on data redundancy present in each FEC-encoded data frame for the determination of its source bits. In some embodiments, the modulated optical signals carrying the FEC-encoded data frames are generated using a polarization-division-multiplexed constellation. The FEC-coding rate and frame length can be adjusted without changing the constellation, which advantageously enables the optical transport system to dynamically adapt its transmission format to the changing link conditions in a manner that results in better overall receiver sensitivity than that achieved with comparable bit-rate-adaptation methods that rely on a constellation change rather than on a change of the FEC-coding rate.

GMSK-Based Modulation in a Wireless Local Area Network

A method includes modulating, at a first wireless device, a first signal based on a Gaussian minimum shift keying (GMSK) modulation scheme to generate a modulated signal. The method also includes amplifying, at the first wireless device, the modulated signal using a nonlinear power amplifier to generate an output signal. The method further includes transmitting, from the first wireless device to a second wireless device, an output signal generated based on the modulated signal via a wireless local area network (WLAN) that is compliant with an Institute of Electrical and Electronics Engineer (IEEE) 802.11ah specification. 1. A method comprising:modulating, at a first wireless device, a first signal based on a Gaussian minimum shift keying (GMSK) modulation scheme to generate a modulated signal;amplifying, at the first wireless device, the modulated signal using a nonlinear power amplifier to generate an output signal; andtransmitting, from the first wireless device to a second wireless device, the output signal via a wireless local area network (WLAN) that is compliant with an Institute of Electrical and Electronics Engineer (IEEE) 802.11ah specification.2. The method of claim 1 , wherein the output signal is transmitted using a single carrier of the WLAN.3. The method of claim 1 , further comprising:encoding, at the first wireless device, an input signal using a binary convolutional codes (BCC) encoder to generate the first signal, wherein the input signal corresponds to one or more packets, wherein the BCC encoder is configured to encode signals that are to be modulated using the GMSK modulation scheme and to encode signals that are to be modulated using an orthogonal frequency-division multiplexing (OFDM) modulation scheme.4. The method of claim 1 , wherein the GMSK modulation scheme has a modulation index of 0.5.5. The method of claim 1 , wherein the GMSK modulation scheme is identified as a mandatory modulation scheme of the WLAN by the IEEE 802.11ah ...

APPARATUS AND METHOD FOR SCRAMBLING IN A WIRELESS COMMUNICATION SYSTEM

An apparatus for a transmit end in a wireless communication system is provided. The apparatus includes at least one scrambler configured to scramble a transmission bit stream, wherein the at least one scrambler comprises, a first circulation unit configured to output, during one cycle, at least one bit for scrambling odd-numbered bits of the transmission bit stream and at least one bit for scrambling even-numbered bits of the transmission bit stream, a second circulation unit configured to output, during one cycle, at least one bit for scrambling odd-numbered bits of the transmission bit stream and at least one bit for scrambling even-numbered bits of the transmission bit stream, and operators configured to generate a scrambled bit stream, wherein each of the operators generates a scrambled bit using an input bit, an output bit from the first circulation unit and an output bit from the second circulation unit. 1. An apparatus for a transmit end in a wireless communication system , the apparatus comprising:at least one scrambler configured to scramble a transmission bit stream,wherein the at least one scrambler comprises:a first circulation unit configured to output, during one cycle, at least one bit for scrambling odd-numbered bits of the transmission bit stream and at least one bit for scrambling even-numbered bits of the transmission bit stream;a second circulation unit configured to output, during one cycle, at least one bit for scrambling odd-numbered bits of the transmission bit stream and at least one bit for scrambling even-numbered bits of the transmission bit stream; andoperators configured to generate a scrambled bit stream, wherein each of the operators generates a scrambled bit using an input bit, an output bit from the first circulation unit and an output bit from the second circulation unit.2. The apparatus of claim 1 , wherein a first circulation unit comprises registers for circulating a first bit sequence; anda second circulation unit comprises ...

TRANSMITTER

According to embodiments of the present invention, a transmitter is provided. The transmitter includes a frequency shift keying (FSK) circuit, and a phase shift keying (PSK) circuit coupled in series to the FSK circuit, wherein the FSK circuit is configured, in a first mode of operation, to provide a FSK modulated signal to the PSK circuit, and, in a second mode of operation, to provide a fixed frequency signal to the PSK circuit, and wherein the PSK circuit is configured, in the first mode of operation, to transmit the FSK modulated signal, and, in the second mode of operation, to provide a PSK modulated signal based on the fixed frequency signal received from the FSK circuit. 1. A transmitter comprising:a frequency shift keying (FSK) circuit; anda phase shift keying (PSK) circuit coupled in series to the FSK circuit;wherein the FSK circuit is configured, in a first mode of operation, to provide a FSK modulated signal to the PSK circuit, and, in a second mode of operation, to provide a fixed frequency signal to the PSK circuit, andwherein the PSK circuit is configured, in the first mode of operation, to transmit the FSK modulated signal, and, in the second mode of operation, to provide a PSK modulated signal based on the fixed frequency signal received from the FSK circuit.2. The transmitter as claimed in claim 1 , wherein in the first mode of operation claim 1 , the PSK circuit is further configured to upscale a frequency of the FSK modulated signal.3. The transmitter as claimed in claim 1 , wherein the FSK circuit comprises:an oscillator coupled to the PSK circuit,wherein the oscillator is configured for injection-locking of a frequency of the FSK modulated signal or the fixed frequency signal to a frequency of an injection signal to be inputted into the oscillator.4. The transmitter as claimed in claim 3 , wherein the PSK circuit comprises:another oscillator coupled in series to the oscillator to receive the FSK modulated signal or the fixed frequency signal, ...

Ultra dense wdm with agile and flexible dsp add-drop

A system, e.g. for optical communication, includes an I-Q modulator and a transmission signal processor. The I-Q modulator is configured to modulate a first light source in response to first I and Q modulation signals. The transmission signal processor is configured to receive a data stream including data corresponding to a first data subchannel. The processor maps the data subchannel to an optical transmission subchannel and outputs the first I and Q modulation signals. The I and Q modulation signals modulate the light source to produce an optical transmission signal that includes wavelength components corresponding to the optical transmission subchannel.

DEVICE FOR CONNECTING TWO PIECES OF EQUIPMENT VIA AN ETHERNET LINK, AND A DOCKING STATION FOR SUCH A PIECE OF EQUIPMENT

A connection device for connecting a first piece of electronic equipment to a second piece of electronic equipment, the device comprising two Ethernet type interfaces that are linked together by an up line and a down line and that are arranged for each of them to be linked to a respective one of the pieces of equipment and to transmit data in differential mode, two power supply modules, each associated with a respective one of the pieces of equipment and wired in common mode between the up and down lines in order to transmit a power supply carrier signal in alternating current, and two secondary transmission modules, each associated with a respective one of the power supply modules and arranged to enable data to be transmitted by modulating the power supply carrier signal. 1. A connection device for connecting a first piece of electronic equipment to a second piece of electronic equipment , the device comprising two Ethernet type interfaces that are linked together by an up line and a down line and that are arranged for each of them to be linked to a respective one of the pieces of equipment and to transmit data in differential mode , two power supply modules , each associated with a respective one of the pieces of equipment and wired in common mode between the up and down lines in order to transmit a power supply carrier signal in alternating current , and two secondary transmission modules , each associated with a respective one of the power supply modules and arranged to enable data to be transmitted by modulating the power supply carrier signal.2. The device according to claim 1 , wherein the secondary transmission module of the first piece of equipment is arranged to perform modulation by phase shift keying.3. The device according to claim 1 , wherein the secondary transmission module of the second piece of equipment is arranged to transmit data by modulating current consumption.4. The device according to claim 3 , wherein the modulation of current consumption ...

TRANSMITTING DEVICE, RECEIVING DEVICE AND COMMUNICATION METHOD FOR AN OFDM COMMUNICATION SYSTEM WITH NEW PREAMBLE STRUCTURE

A transmitting device, a receiving device, and a communication method for transmitting and receiving data modulated on frequency subcarriers of an OFDM communication system. An OFDM burst includes a preamble part and payload data part, whereby the preamble includes a section of pilot symbols mapped onto every n-th frequency subcarrier and signaling data mapped onto the frequency subcarriers between the frequency subcarriers with the pilot symbols. A first channel estimation on the basis of the received pilot symbols is performed, the result of which is used to reconstruct the entire section of the received preamble as a training pattern for an accurate channel estimation, which is used for a channel equalization of the received payload part. 17-. (canceled)8. A receiver , comprising circuitry configured to:receive signals modulated on frequency subcarriers of an orthogonal frequency division multiplexing (OFDM) communication system and receive OFDM bursts including a preamble part and a payload data part, the preamble part including signaling data and pilot symbols; the pilot symbols mapped onto pilot subcarriers that are every nth frequency subcarrier of the frequency subcarriers, where n=2 or more, and', 'the signaling data mapped onto signaling subcarriers that are frequency subcarriers that are between the pilot subcarriers, such that portions of the signaling data and the pilot symbols are transmitted in a same section of the preamble and at a same time;, 'receive the preamble part, the preamble part including a section includingperform a first channel estimation based on the pilot symbols, wherein the pilot symbols form a cross-correlation pattern and a distance between adjacent pilot subcarriers, in the frequency dimension, is set so that interpolation by the receiver is able to predict amplitude attenuation and phase shift for the signaling data; andperform a first channel equalization based on the first channel estimation.9. The receiver according to claim ...

TONE PLANS AND PREAMBLES FOR EXTREMELY HIGH THROUGHPUT

Methods, apparatuses, and computer readable media for tone plans and preambles for extremely high throughput (EHT) in a wireless network are disclosed. An apparatus of an EHT access point (AP) or EHT station (STA), where the apparatus includes processing circuitry configured to: encode a physical layer (PHY) protocol data unit (PPDU), the PPDU including a EHT preamble, the EHT preamble including a legacy preamble portion and a EHT preamble portion, the legacy preamble including a legacy short training field (L-SFT), a legacy long-training field (L-LTF), and a legacy signal field (L-SIG), the EHT preamble portion comprising an EHT short signal field (EHT S-SIG), the EHT S-SIG including a modulation and coding scheme (MCS) subfield indicating a MCS of a subsequent data portion. The PPDU may be transmitted on a distributed or contiguous resource unit (RU) allocation. The RU may be configured to not straddle two physical 20 MHz subchannels. 1. (canceled)2. An apparatus of an extremely high-throughput (EHT) station (STA) , the apparatus comprising memory; and processing circuitry coupled to the memory , the processing circuitry configured to:decode a trigger frame, the trigger frame allocating resources for and soliciting trigger based (TB) physical layer protocol data unit (PPDU) transmissions, the trigger frame comprising an indication of an uplink (UL) bandwidth (BW) of 80 MHz, the UL bandwidth of 80 MHz comprising four 20 MHz subchannels, the trigger frame further comprising an indication of a plurality of resource units (RUs), the plurality of RUs comprising nine 26 tone allocations per 20 MHz of the 80 MHz, wherein each of the 26 tone allocations is allocated within one of the four 20 MHz subchannels;encode a TB PPDU, the TB PPDU comprising an EHT preamble and a subsequent data portion, the EHT preamble to comprise a legacy preamble portion and an EHT preamble portion, the legacy preamble comprising a legacy short training field (L-STF), a legacy long-training ...

MODULATION CIRCUIT AND WIRELESS COMMUNICATION APPARATUS

A modulation circuit that can improve an on/off ratio or increase short pulses, and a wireless communication apparatus are provided. The modulation circuit includes a first transistor in which a first signal is input to a gate terminal; a second transistor that is cascode-connected to the first transistor by connecting a source terminal to a drain terminal of the first transistor, that receives an input of a second signal having a frequency lower than the first signal at a gate terminal, and that modulates the second signal by the first signal and outputs the modulated second signal; and a switch circuit that is formed on the output side of the second transistor. The switch circuit is turned on in synch with a switching of the second transistor to an off state, and turned off in synch with a switching of the second transistor to an on state. 1. A modulation circuit , comprising:a first transistor in which a first signal is input to a gate terminal;a second transistor that is cascode-connected to the first transistor by connecting a source terminal to a drain terminal of the first transistor, that receives an input of a second signal having a frequency lower than the first signal at a gate terminal, and that modulates the second signal by the first signal and outputs the modulated second signal; anda switch circuit that is formed on the output side of the second transistor,wherein the switch circuit is turned on in synch with a switching of the second transistor to an off state, and turned off in synch with a switching of the second transistor to an on state.2. The modulation circuit of claim 1 , further comprising:an inverter that reverses the second signal and inputs the reversed second signal to a gate terminal of the second transistor,wherein a switch of the switch circuit is controlled by the second signal before being reversed by the inverter.3. The modulation circuit of claim 2 , wherein the switch circuit comprises a third transistor claim 2 , and is driven ...

SWITCHING CIRCUIT

A conversion circuit is disclosed. In one aspect, the conversion circuit includes a first input terminal for receiving a digital signal. The conversion circuit includes a second input terminal for receiving a bias voltage signal. The conversion circuit includes an output terminal for outputting a current. The conversion circuit includes a first and a second switch transistor connected to the first input terminal for receiving the digital signal. The conversion circuit includes a first and a second current source transistor connected to the second input terminal for receiving the bias voltage signal. The conversion circuit further includes a first branch, wherein the first switch transistor is connected to the output terminal via the first current source transistor. The conversion circuit further includes a second branch, wherein the second current source transistor is connected to the output terminal via the second switch transistor. 1. A conversion circuit , comprising:a first input terminal for receiving a digital signal;a second input terminal for receiving a bias voltage signal;an output terminal for outputting a current;a first and a second switch transistor connected to the first input terminal for receiving said digital signal;a first and a second current source transistor connected to the second input terminal for receiving the bias voltage signal;a first branch, wherein the first switch transistor is connected to the output terminal via the first current source transistor; anda second branch wherein the second current source transistor is connected to the output terminal via the second switch transistor.2. The conversion circuit of claim 1 , further comprising a transistor in cascode arranged for being fed with the current output via the output terminal.3. The conversion circuit of claim 1 , wherein the output terminal comprises:a first output terminal in the first branch; anda second output terminal in the second branch.4. The conversion circuit of claim 1 ...

Phase Modulated Data Link for Low-Swing Wireline Applications

A communication system comprises a transmitter and a receiver that communicate differential phase modulated data over a wireline channel pair. The transmitter encodes data symbols by generating first and second data signals with differentially phase shifted signal transitions with respect to one another. The receiver receives the first data signal and the second data signal and samples the first data signal based on a signal transition timing of the second data signal to generate a first output data symbol. The receiver furthermore samples the second data signal based on signal transition timing of the first data signal to generate a second output data symbol. 1. A chip comprising:a set of input nodes to receive respective first and second data signals that represent differential phase modulated data such that, for a symbol time interval, a phase shifted signal transition in the first data signal is used to encode a first binary symbol type and a phase shifted signal transition in the second data signal is used to encode a second binary symbol type; anda logic circuit configured to output an output signal based on a difference between the first data signal and the second data signal,wherein the output signal corresponds to the first binary symbol type responsive to the difference being a positive value and the output signal corresponds to the second binary symbol type responsive to the difference being a negative value.2. The chip of claim 1 , wherein the phase shifted signal transition in the first data signal has a phase difference relative to a signal transition in the second data signal to encode the first binary symbol type claim 1 , and wherein the phase shifted signal transition in the second data signal has the phase difference relative to a signal transition in the first data signal to encode the second binary symbol type.3. The chip of claim 1 , further comprising:a first amplifier circuit comprising a first injection-locked oscillator, the first amplifier ...

TRANSCEIVER ARRANGEMENT AND COMMUNICATION DEVICE

A transceiver arrangement is disclosed. The transceiver arrangement comprises a receiver arranged for frequency-division duplex communication with a communication network and a transmitter arranged for frequency-division duplex communication with the communication network. The transceiver arrangement also comprises a transmission port anda phase shifter arrangement which comprises a first 180° phase shifter and a second 180° phase shifter. The transceiver arrangement further comprises a filtering arrangement. The filtering arrangement comprises filters of a first type and filters of a second type. The filtering arrangement and the phase shifter arrangement are arranged to connect the receiver, transmitter and transmission port forming a first signal path between the transmission port and the transmitter by a first one of the filters of the first type and the first phase shifter in series, a second signal path between the transmission port and the transmitter by a second one of the filters of the first type and a first one of the filters of the second type in series, a third signal path between the transmission port and the receiver by a second one of the filters of the second type and the second phase shifter in series, and a fourth signal path between the transmission port and the receiver by a third one of the filters of the second type and a third one of the filters of the first type in series. The filters of the first type are arranged to pass signals at transmitter frequency and attenuate signals at receiver frequency, and the filters of the second type are arranged to attenuate signals at transmitter frequency and pass signals at receiver frequency. A communication device capable of frequency division duplex communication comprising such a transceiver arrangement is also disclosed. 1. A transceiver arrangement comprisinga receiver arranged for frequency-division duplex communication with a communication network;a transmitter arranged for frequency-division ...

Transmitting apparatus, receiving apparatus, transmission method, and reception method

A transmission frame generating device generates a transmission frame. The generating device includes a control information signal generator which generates a modulation method control signal indicating a modulation method used for a data signal and an error correction method control signal indicating an error correction method used for the data signal and a frame former which forms the transmission frame by arranging a training signal, the data signal, the modulation method control signal and the error correction method control signal on a plurality of subcarriers on a frequency axis. The modulation method control signal being repeatedly and discretely arranged on a first multiple of the plurality of subcarriers on the frequency axis and the error correction method control signal being repeatedly and discretely arranged on a second multiple of the plurality of the subcarriers on the frequency axis.

METHOD, APPARATUS AND COMPUTER PROGRAM FOR TRANSMITTING AND/OR RECEIVING SIGNALS

Methods, apparatus and computer programs for transmitting and/or receiving information are described. Information encoded in a carrier signal comprising a modulation pattern superimposed on a grid frequency at which electricity flows in a synchronous area of an electric power grid, is decoded by measuring, at a receiving device, a characteristic relating to a frequency of electricity flowing in the electric power grid, accessing data indicative of one or more predetermined code patterns and performing a correlation process to determine a correlation between the modulation pattern and one of the one or more predetermined code patterns. The information is decoded on the basis of the determined correlation. This enables information to be easily transmitted within a synchronous area of the electric power grid. 1. A method of decoding , at a receiving device , information encoded in a carrier signal and transmitted within a synchronous area of an electric power grid , the carrier signal comprising an alternating current , or alternating voltage , of electric power flowing in the electric power grid in accordance with a grid frequency , the method comprising:measuring, at the receiving device, a characteristic relating to a frequency of the electric power flowing in the electric power grid;accessing data indicative of one or more predetermined code patterns;performing a correlation process, at the receiving device, to determine a correlation between at least a portion of a modulation pattern of the measured frequency characteristic and at least one of the one or more predetermined code patterns, the modulation pattern comprising a frequency pattern superimposed on the grid frequency; anddecoding information encoded in the carrier signal on the basis of the determined correlation.2. The method of claim 1 , wherein the receiving device comprises a data store storing the one or more predetermined code patterns claim 1 , and the method comprises accessing the data store to ...

A PHASE REFERENCE SYMBOL FORMAT FOR OFDM PHASE SYNCHRONIZATION

The present invention describes an orthogonal frequency-division multiplexing, OFDM, transmitter and a method for embedding phase reference symbols into an OFDM symbol. The invention comprises a single-carrier pre-processing unit arranged to receive phase reference symbols and provide pre-processed phase reference samples as output and an OFDM modulator arranged to receive data symbols and the pre-processed phase reference samples as input and map the data symbols to sub-carriers and embed the single-carrier samples into a frequency sub-band of the OFDM symbol. While the invention particularly relates to an OFDM communication system, it should be noted that it could be applicable to any type of multicarrier communication system. 1. An orthogonal frequency division multiplexer (OFDM) transmitter arranged to embed single-carrier phase reference symbols into an OFDM symbol , the OFDM transmitter comprising:a single-carrier pre-processing unit arranged to receive phase reference symbols as input and provide pre-processed phase reference samples as output, andan OFDM modulator arranged to receive data symbols and pre-processed phase reference samples as input and map the data symbols to sub-carriers and embed the single-carrier samples into a frequency sub-band of the OFDM symbol.2. The OFDM transmitter according to claim 1 , whereinthe pre-processed phase reference samples are frequency-domain pre-processed phase reference samples and the single-carrier pre-processing unit comprises a K-point discrete Fourier discrete Fourier transformation (DFT) unit arranged to receive K phase reference symbols as input and provide K DFT-precoded frequency domain samples as output, and an insert prefix postfix unit arranged to insert P prefix and P postfix samples to the DFT-precoded frequency domain samples to obtain the frequency-domain pre-processed phase reference samples, andthe OFDM modulator comprises an N-point inverse discrete Fourier transformation (IDFT) unit arranged to ...

TRANSMISSION METHOD, TRANSMISSION DEVICE, RECEPTION METHOD, AND RECEPTION DEVICE

Provided is a precoding method for generating, from a plurality of baseband signals, a plurality of precoded signals to be transmitted over the same frequency bandwidth at the same time, including the steps of selecting a matrix F[i] from among N matrices, which define precoding performed on the plurality of baseband signals, while switching between the N matrices, i being an integer from 0 to N−1, and N being an integer at least two, generating a first precoded signal z and a second precoded signal z, generating a first encoded block and a second encoded block using a predetermined error correction block encoding method, generating a baseband signal with M symbols from the first encoded block and a baseband signal with M symbols the second encoded block, and precoding a combination of the generated baseband signals to generate a precoded signal having M slots. 1. A transmission method executed by a transmission system , the transmission method comprising:{'b': 1', '2', '1', '2', '1', '2, 'generating a plurality of first transmission symbols z and a plurality of second transmission symbols z for each slot by using any one of N signal processes with respect to a plurality of first modulated symbols s and a plurality of second modulated symbols s, the plurality of first modulated symbols s being generated for each slot as one or more first data symbols and one or more first pilot symbols, the plurality of second modulated symbols s being generated for each slot as one or more second data symbols and one or more second pilot symbols, the one or more first data symbols being generated with the same transmission data bits as the one or more second data symbols, N being an integer that is at least three, the N signal processes being regularly switched with a plurality of slots as one cycle, a part of the N signal processes being applied to the one or more first data symbols and the one or more second data symbols;'}{'b': '1', 'transmitting a plurality of first OFDM ...

USING COMMON MODE LOCAL OSCILLATOR TERMINATION IN SINGLE-ENDED COMMUTATING CIRCUITS FOR CONVERSION GAIN IMPROVEMENT

A commutating circuit includes a single-ended mixer and a passive network. The single-ended mixer includes a differential local oscillator terminal. The passive network includes a plurality of inductors and a capacitor. The plurality of inductors can be coupled to the differential local oscillator terminal. The plurality of inductors can provide an impedance in accordance with a common mode or a differential mode. The commutating circuit can be implemented via a device, a system and/or a method. 1. A commutating circuit , comprising:a single-ended mixer comprising a differential local oscillator terminal; anda passive network comprising a plurality of inductors and a capacitor;wherein the plurality of inductors is coupled to the differential local oscillator terminal and provides an impedance in accordance with a common mode or a differential mode.2. The commutating circuit of claim 1 , wherein the plurality of inductors include first and second inductors.3. The commutating circuit of claim 2 , wherein the passive network is formed with a first terminal of the capacitor coupled to each of the plurality of inductors and a second end of the capacitor coupled to a signal ground.4. The commutating circuit of claim 1 , wherein the capacitor comprises a shunt capacitor.5. The commutating circuit of claim 1 , wherein the passive network comprises a reactive passive network.6. The commutating circuit of claim 1 , wherein the passive network is included in a matching network of the commutating circuit for a differential local oscillator input signal.7. The commutating circuit of claim 6 , wherein the passive network provides the impedance through series resonance for the common mode.8. The commutating circuit of claim 1 , wherein the single-ended mixer comprises a binary phase-shift keying modulator.9. The commutating circuit of claim 1 , wherein the single-ended mixer comprises a quadrature phase-shift keying modulator.10. The commutating circuit of claim 1 , wherein the ...

Phase modulation systems and methods

In a phase modulation method enable signals may be sequentially generating based on a clock signal to generate a sequence of enable signals, and a signal is delayed by delay values generated from delay cells based on the sequence of enable signals and digital bit values. A phase modulator may include a first delay circuit configured to: delay a clock signal based on a first delay value to generate a first delayed clock signal, and delay a carrier signal based on the first delayed clock signal to generate a first delayed carrier signal; and a second delay circuit configured to: delay the first delayed clock signal based on a second delay value to generate a second delayed clock signal, and delay the first delayed carrier signal based on the second delayed clock signal to generate a second delayed carrier signal.

METHOD AND APPARATUS FOR TRANSCEIVING DATA IN A MIMO SYSTEM

The present invention relates to a method and apparatus for transceiving data. A method in which a transmitting terminal transmits data to a receiving terminal in a MIMO system according to one embodiment of the present invention comprises the following steps: generating a data field containing the data; generating a signal field containing information on the data field; generating a data frame containing the data field and the signal field; and transmitting the data frame to the receiving terminal. According to the present invention, an end of the frame being transmitted is accurately notified to the receiving terminal in a communication system in which the frame is transmitted using MIMO, thereby decoding the frame in a more efficient manner at the receiving terminal. 1. A method for wireless local area network using Multi-User Multiple Input Multiple Output (MU-MIMO) transmission , the method comprising ,generating a Very High Throughout Signal-A (VHT SIG-A) field;generating a Very High Throughout Signal-B (VHT SIG-B) field including length information indicating a length of a Physical layer Service Data Unit (PSDU) and information about a Modulation and Coding Scheme (MCS);generating VHT data including a service field and the PSDU; andtransmitting a Physical layer Protocol Data Unit (PPDU) including the VHT SIG-A field, the VHT SIG-B field and the VHT data over an operating channel,wherein the service field includes scrambler information and a cyclic redundancy check (CRC), the CRC being calculated over the VHT SIG-B field.2. The method of claim 1 , wherein the VHT SIG-B field includes a block of bits claim 1 , wherein a bit number of the block of bits is determined based on a channel bandwidth of the operating channel.3. The method of claim 2 , wherein the bit number of the block of bits is 26 bits if the channel bandwidth is 20 MHz claim 2 , the bit number of the block of bits is 27 bits if the channel bandwidth is 40 MHz and the bit number of the block of ...

METHOD FOR ADJUSTING PARAMETERS OF PHASE LOCKED LOOP, BLUETOOTH MODULE AND BLUETOOTH SYSTEM

A method for adjusting parameters of a phase locked loop includes: receiving an ID packet from a Bluetooth master device, the ID packet comprising a preamble; calculating a carrier frequency offset according to the preamble of the ID packet; and correcting a deviation of the phase locked loop according to the carrier frequency offset. 1. A method for adjusting parameters of a phase locked loop , comprising:receiving an ID packet from a Bluetooth master device, the ID packet comprising a preamble;calculating a carrier frequency offset according to the preamble of the ID packet; andcorrecting a deviation of the phase locked loop according to the carrier frequency offset.2. The method according to claim 1 , wherein the correcting a deviation of the phase locked loop according to the carrier frequency offset comprises:adjusting a frequency division ratio of the phase locked loop according to the carrier frequency offset; andcompensating a deviation of a reference clock of the phase locked loop by adjusting the frequency division ratio of the phase locked loop.3. The method according to claim 1 , wherein the receiving an ID packet from a Bluetooth master device comprises:receiving a modulated signal of the ID packet; anddemodulating the modulated signal of the ID packet.4. The method according to claim 3 , wherein the demodulating the modulated signal of the ID packet comprises:down-sampling an in-phase signal and an orthogonal signal of the ID packet to acquire corresponding down-sampling signals;performing channel selection filtering for the down-sampling signals to acquire corresponding filter signals; andsolving a phase angle function for the filter signal to obtain a differential value.5. The method according to claim 4 , wherein the calculating a carrier frequency offset according to the preamble of the ID packet comprises:acquiring differential values of the preamble; andaveraging the differential values of the preamble to acquire the carrier frequency offset.6. A ...

Systems and method for estimating clock drift in underwater acoustic instruments

A system and method for estimating clock drift in underwater instruments is provided. The method can include transmitting a signal from a source to a plurality of underwater receivers or a single receiver. Upon recovery of the underwater receivers, an initial sampling frequency value can be used to generate received data waveforms from data stored on each underwater device. The generated received waveforms can be used to generate a channel estimate for each receiver, and the channel estimates can be used to provide an estimate of the source motion during the transmission. The estimated source motion can then be used to estimate the clock drift.

IQ MISMATCH CORRECTION FOR ZERO-IF/LOW-IF TX/RX

IQ mismatch correction for analog chain IQ mismatch impairments is based on a two-filter architecture. In either RX or TX, an IQmc mismatch corrector (digital chain) filters I and Q digital signals, and includes an I-path to receive the I signal, and a Q-path to receive the Q signal, and is configured with two filters: an in-path filter to filter either the I signal or the Q signal received in the same path; and a cross-path filter to filter either the I signal or the Q signal received in the other path. The IQmc mismatch corrector can include: an I-path delay element to provide a delay to the I signal corresponding to a delay through either the in-path filter or the cross-path filter; and a Q-path delay element to provide a delay to the Q signal corresponding to a delay through either the in-path filter or the cross-path filter. 1. A circuit to provide IQ mismatch correction for use in a system for radio frequency (RF) communication including a transmit (TX) end , and/or a receive (RX) end , the circuit comprising: the analog signal chain including analog circuitry that introduces IQ mismatch signal impairments,', 'the digital signal chain including an IQmc mismatch corrector to filter In-phase and Quadrature digital signals to provide IQmc correction to correct the IQ mismatch impairments, and', 'an interface between the digital signal chain and the analog signal chain; and, 'at one of the TX end or the RX end, an analog signal chain and a digital signal chain an I-path coupled to receive the In-phase digital signals (I signal), and', 'a Q-path coupled to receive the Quadrature digital signals (Q signal); and', 'an in-path filter element to filter either the I signal or the Q signal received in the same path, and', 'a cross-path filter element to filter either the I signal or the Q signal received in the other path., 'the IQmc mismatch corrector, including2. The circuit of claim 1 , the IQmc mismatch corrector further including:an I-path delay element included in ...

O-QPSK Symbol Timing Estimation

Methods and systems for estimating a symbol timing error for an offset quadrature phase shift keying (O-QPSK) modulated signal. The method includes: receiving a plurality of complex samples representing an O-QPSK modulated signal, wherein if the O-QPSK modulated signal is sampled on time each of the plurality of samples has substantially no imaginary component; generating an early error metric and a late error metric for each sample, the early error metric based on the imaginary component for the sample and a sign of a real component of a previous sample and the late error metric based on the imaginary component for the sample and a sign of a real component of a next sample; generating a combined early error metric based on the early error metrics for the plurality of samples; generating a combined late metric based on the late error metrics for the plurality of samples; and generating an estimate of the symbol timing error based on the combined early error metric and the combined late metric. 1. A method of estimating a symbol timing error for an offset quadrature phase shift keying “O-QPSK” modulated signal , the method comprising:receiving a set of phase rotated complex samples representing the O-QPSK modulated signal, the set of phase rotated complex samples having been generated by sampling a representation of the O-QPSK modulated signal at an O-QPSK symbol rate to generate an initial set of complex samples and applying a phase rotation to one or more of the samples in the initial set of complex samples such that if the representation of the O-QPSK modulated signal is sampled on time each sample in the set of phase rotated complex samples has substantially no imaginary component;generating an early error metric and a late error metric for each sample in the set of phase rotated complex samples, the early error metric based on the imaginary component for the sample and a sign of a real component of a previous sample and the late error metric based on the ...

System and Method for Auto-Detection of WLAN Packets using STF

A method of auto-detection of WLAN packets includes selecting a first Golay sequence from a first pair of Golay complementary sequences associated with first packet type, each Golay sequence of the first pair of Golay complementary sequences being zero correlation zone (ZCZ) sequences with each Golay sequence of a second pair of Golay complementary sequences associated with a second packet type, and transmitting a wireless packet carrying a short training field (STF) that includes one or more instances of the first Golay sequence. 1. A method comprising:receiving a wireless packet comprising a short training field (STF);determining cross-correlations between the STF and a first preamble component sequence from a first set of preamble component sequences associated with a first packet type and between the STF and a second preamble component sequence from a second set of preamble component sequences associated with a second packet type, the first preamble component sequence and the second preamble component sequence having a zero correlation zone (ZCZ) property; anddetermining that the wireless packet is the second packet type when there is a greater correlation between the STF and the second preamble component sequence than between the STF and the first preamble component sequence.2. The method of claim 1 , wherein the first packet type is an Institute of Electrical and Electronics Engineers (IEEE) 802.11ad packet type claim 1 , and the second packet type is an IEEE 802.11ay packet type.3. The method of claim 1 , wherein the ZCZ property is a ZCZ of at least 64 symbol time slots in width.4. The method of claim 1 , wherein the first set of preamble component sequences comprise preamble component sequences Gaand Gb.5. The method of claim 1 , wherein the second set of preamble component sequences comprise preamble component sequences Gaand Gb.6. The method of claim 1 , wherein the second set of preamble component sequences comprise mutual ZCZ sequences.7. The method of ...

DATA COMPRESSION METHOD AND APPARATUS

Embodiments of this application provide a data compression method, including: performing first processing on π/2-binary phase shift keying BPSK modulated data with a length of M, to obtain first frequency domain data with a length of M, where the first processing includes Fourier transform, and M is an even number; performing second processing on second frequency domain data with a length of Q, to obtain time domain data, where data in the second frequency domain data is included in the first frequency domain data, Q is a positive integer, M is greater than Q, Q is greater than or equal to M/2, and the second processing includes inverse Fourier transform; and sending the time domain data on one time domain symbol. 1. A method performed at a transmit end , comprising:performing a first processing on binary phase shift keying (BPSK) modulated data with a length of M, to obtain a first frequency domain data with a length of M, wherein the first processing comprises Fourier transform, and M is an even number;performing a second processing on a second frequency domain data with a length of Q, to obtain a time domain data, wherein data in the second frequency domain data is comprised in the first frequency domain data, Q is a positive integer, M is greater than Q, Q is greater than or equal to M/2, and the second processing comprises inverse Fourier transform; andsending the time domain data on one time domain symbol.2. The method according to claim 1 , wherein a qpiece of frequency domain data in the second frequency domain data is selected from one of the group of an (└(M−Q+1)/2┘+q)piece of frequency domain data in the first frequency domain data claim 1 , an (└(M−Q)/2┘+q)piece of frequency domain data in the first frequency domain data claim 1 , or an (┌(M−Q)/2┐+q)piece of frequency domain data in the first frequency domain data claim 1 , wherein a value of q is an integer ranging from 0 to Q−1.3. The method according to claim 1 , wherein the second processing further ...

TONE PLANS AND PREAMBLES FOR EXTREMELY HIGH THROUGHPUT

Methods, apparatuses, and computer readable media for tone plans and preambles for extremely high throughput (EHT) in a wireless network are disclosed. An apparatus of an EHT access point (AP) or EHT station (STA), where the apparatus includes processing circuitry configured to: encode a physical layer (PHY) protocol data unit (PPDU), the PPDU including a EHT preamble, the EHT preamble including a legacy preamble portion and a EHT preamble portion, the legacy preamble including a legacy short training field (L-SFT), a legacy long-training field (L-LTF), and a legacy signal field (L-SIG), the EHT preamble portion comprising an EHT short signal field (EHT S-SIG), the EHT S-SIG including a modulation and coding scheme (MCS) subfield indicating a MCS of a subsequent data portion. The PPDU may be transmitted on a distributed or contiguous resource unit (RU) allocation. The RU may be configured to not straddle two physical 20 MHz subchannels. 1. An apparatus of an extremely high-throughput (EHT) access point (AP) or EHT station (STA) , the apparatus comprising memory; and processing circuitry coupled to the memory , the processing circuitry configured to:encode a physical layer (PHY) protocol data unit (PPDU), the PPDU comprising a EHT preamble, the EHT preamble to comprise a legacy preamble portion and a EHT preamble portion, the legacy preamble comprising a legacy short training field (L-SFT), a legacy long-training field (L-LTF), and a legacy signal field (L-SIG), the EHT preamble portion comprising an EHT short signal field (EHT S-SIG), the EHT S-SIG comprising an modulation and coding scheme (MCS) subfield, the MCS subfield indicating a MCS of a subsequent data portion;encode the PPDU to comprise the subsequent data portion in accordance with the MCS; andconfigure the EHT AP or the EHT STA to transmit the PPDU.2. The apparatus of claim 1 , wherein the processing circuitry is further configured to:encode the legacy preamble to further comprise a repeat of the L-SIG ( ...

Modular Microwave Backhaul Outdoor Unit

A microwave backhaul system may comprise a monolithic integrated circuit comprising an on-chip transceiver, digital baseband processing circuitry, and auxiliary interface circuitry. The on-chip transceiver may process a microwave signal from an antenna element to generate a first pair of quadrature baseband signals and convey the first pair of phase-quadrature baseband signals to the digital baseband processing circuitry. The auxiliary interface circuitry may receive one or more auxiliary signals from a source that is external to the monolithic integrated circuit and convey the one or more auxiliary signals to the digital baseband processing circuitry. The digital baseband processing circuitry may be operable to process signals to generate one or more second pairs of phase-quadrature digital baseband signals. 1. A system comprising:an on-chip transceiver operable to process a microwave signal from an antenna element to generate a first baseband signal, wherein a bandwidth of said microwave signal spans multiple discontiguous microwave backhaul channels;auxiliary interface circuitry operable to receive one or more auxiliary signals; andbaseband processing circuitry operable to process said first baseband signal and said one or more auxiliary signals to generate one or more second baseband signals, wherein said baseband circuitry is operable to perform phase shifting and weighted combining of said first baseband signal and said second baseband signal to generate one or more third baseband signals.2. The system of claim 1 , wherein said first baseband signal comprises a first in-phase-digital baseband signal and a first quadrature-phase digital baseband signal claim 1 , wherein said baseband circuitry is operable to perform phase shifting and weighted combining of said first in-phase-digital baseband signal claim 1 , said first quadrature-phase digital baseband signal claim 1 , and said one or more auxiliary signals to generate one or more second in-phase digital ...

SIMULTANEOUS TRANSMISSION AND RECEPTION OF AN ORTHOGONAL MULTIPLEXED SIGNAL AND A NON-ORTHOGONAL MULTIPLEXED SIGNAL

Methods and apparatus as described herein for determining whether to transmit a signal to at least one receiver of a plurality of receivers with an orthogonal multiplexing technique while signals to a remainder of the plurality of receivers are simultaneously transmitted with a non-orthogonal multiplexing technique If it is determined that the signal should be transmitted to the at least one receiver with the orthogonal multiplexing technique, simultaneously transmitting the signal to the at least one receiver with the orthogonal multiplexing technique and the signals to the remainder of the plurality of receivers with the non-orthogonal multiplexing technique. Methods and apparatus are also described for decoding the signals on the receiving end. 1. A method comprising:generating a first signal that includes a first stream of bits mapped to a first subset of a set of available resource elements with an orthogonal multiplexing technique;generating a second signal that includes a plurality of third signals multiplexed together with a non-orthogonal multiplexing technique, each of the third signals including at least one second stream of bits mapped to a respective second subset of the set of available resource elements; andsimultaneously transmitting the first and second signals on the set of available resource elements.2. The method of claim 1 , wherein:generating the first signal comprises mapping the first stream of bits using Orthogonal Frequency Division Multiple Access (OFDMA); andgenerating the second signal comprises multiplexing the plurality of third signals using code domain non-orthogonal multiplexing.3. The method of claim 1 , wherein generating the first signal comprises encoding the first stream of bits using one of Quadrature Amplitude Modulation (QAM) or Phase Shift Keying (PSK).4. The method of claim 1 , wherein generating the second signal comprises multiplexing the plurality of third signals using Sparse Code Multiple Access (SCMA).5. The method ...

System and Method for Scrambling the Phase of the Carriers in a Multicarrier Communications System

A system and method that scrambles the phase characteristic of a carrier signal are described. The scrambling of the phase characteristic of each carrier signal includes associating a value with each carrier signal and computing a phase shift for each carrier signal based on the value associated with that carrier signal. The value is determined independently of any input bit value carried by that carrier signal. The phase shift computed for each carrier signal is combined with the phase characteristic of that carrier signal so as to substantially scramble the phase characteristic of the carrier signals. Bits of an input signal are modulated onto the carrier signals having the substantially scrambled phase characteristic to produce a transmission signal with a reduced PAR. 120.-. (canceled)21. A method , in a transceiver using a transmission signal having a plurality of carrier signals , comprising:scrambling, by a phase scrambler, the plurality of carrier signals to at least reduce a Peak-to-Average Power Ratio (PAR) of a multicarrier signal when one or more data bits are transmitted on a first carrier signal of the multicarrier signal and the same one or more data bits are transmitted on a second carrier signal of the multicarrier signal,determining, by a QAM encoder, a phase characteristic of a QAM symbol for the first carrier signal and the second carrier signal, wherein the phase characteristic depends at least on the one or more data bits;determining, using a pseudo-random number generator and a seed value, a first value for the first carrier signal, wherein the first value is determined independently of the one or more data bits;modifying, by the phase scrambler, the phase characteristic of the QAM symbol of the first carrier signal at least based on the first value to scramble the plurality of carrier signals to at least reduce the PAR of the multicarrier signal;determining, using the pseudo-random number generator and the seed value, a second value for the ...

RADIO TRANSMISSION METHOD AND ADAPTED RADIO TRANSMITTER

A radio transmission method which includes a steps of simulation of a phase modulation of a radio carrier by the successive transmission of a carrier of a main frequency f and of a carrier of an offset frequency f+Δf, the offset frequency having a frequency difference suitable for simulating a given phase shift of the main frequency at the end of a given time T. The invention further relates to a radio transmission device for implementing the method which includes a radio integrated circuit for generating programmable frequency modulation, means for programming, in this radio integrated circuit, the main frequency f and the offset frequency f+Δf and means for driving this radio integrated circuit in order to generate the frequencies as a function of the signal to be transmitted. 1. A radio transmission method , characterized in that it comprises steps of simulation of a phase modulation of a radio carrier by the successive transmission of a carrier of a main frequency f and of a carrier of an offset frequency f+Δf , the offset frequency having a frequency difference suitable for simulating a given phase shift of the main frequency at the end of a given time T.2. The radio transmission method as claimed in claim 1 , characterized in that the simulation consists in modifying ω*t=2πf*t claim 1 , in which f represents the frequency of the carrier so as to vary the instantaneous phase of the carrier signal.3. The radio transmission method as claimed in claim 1 , characterized in that the modulation is a binary phase modulation claim 1 , the given time T being the time needed to obtain a phase shift of π that can be detected by the receiver.4. The radio transmission method as claimed in of claim 1 , characterized in that it comprises at least one step of generation of the base carrier f claim 1 , at least one step of generation of the offset carrier f+Δf claim 1 , at least one step of transmission of the offset carrier for the time needed for a phase shift of π after ...

PHASE SHIFTER

The disclosure relates to a phase shifter having a first mode of operation and a second mode of operation, the phase shifter comprising a mixer stage configured to mix an oscillator signal with an analogue signal to provide a phase shifted signal, switching circuitry and a controller arranged to provide the analogue signal to the mixer stage as a voltage in the first mode of operation and as a current in the second mode of operation. 1. A phase shifter comprising:a mixer stage configured to mix an oscillator signal with an analogue signal to provide a phase shifted signal,switching circuitry and a controller configured to provide the analogue signal to the mixer stage as a voltage in a first mode of operation and as a current in a second mode of operation.2. The phase shifter of claim 1 , wherein the mixer stage comprises a mixer and a transconductance stage claim 1 , wherein the controller is configured to control the switching circuity to:provide the analogue signal to the transconductance stage and connect the transconductance stage to the mixer in the first mode of operation; andprovide the analogue signal to the mixer in the second mode of operation.3. The phase shifter of claim 1 , wherein the controller is configured to control the switching circuity to isolate the transconductance stage from the mixer or analogue signal in the second mode of operation.4. The phase shifter of claim 1 , wherein the phase shifter comprises an in-phase mixer and a quadrature mixer for mixing an oscillator signal with the respective in-phase and quadrature analogue signals to provide phase shifted signals in accordance with the desired in-phase and quadrature-phase shifts.5. A transmitter module comprising:a digital-to-analogue converter configured to receive a control signal indicative of a desired phase shift and to provide the analogue signal in accordance with the desired phase shift; andthe phase shifter of any preceding claim.6. The transmitter module of further comprising ...

MITIGATION OF PARTIAL BAND JAMMING FOR SATELLITE COMMUNICATIONS

A transmitter, including a signal processor programmed to generate, based on input serial data, for each of an integer number of subcarriers mutually orthogonal to each other, a respective first parallel data stream. The signal processor is further programmed to modulate each of the integer number of subcarriers respectively with the respective parallel stream to generate the integer number of data-modulated subcarriers. The signal processor is further programmed to modulate a single carrier occupying a same bandwidth as the integer number of subcarriers with a unique word and one or more pilot symbols to generate a second signal. The signal processor combines the first signal and second signal to generate a third signal. The signal processor generates an output signal by applying a transmit filter to the third signal. 1. A transmitter , comprising a first signal processor programmed to:based on input serial data, generate, for each of an integer number of subcarriers mutually orthogonal to each other, a respective first data parallel stream;modulate a single carrier in a time domain, the single carrier occupying a same bandwidth as the integer number of subcarriers, with a unique word and one or more pilot symbols to generate a first signal;modulate each of the integer number of subcarriers with the respective first data parallel stream in a frequency domain, while leaving the unique word and one or more pilot symbols in the time domain;serialize the integer number of data modulated subcarriers to generate a second signal in the time domain;combine the first signal and second signal to generate a third signal; andgenerate an output signal by applying a transmit filter to the third signal.2. The transmitter of wherein the first signal processor is further programmed to:transmit the output signal to a second signal processor.3. The transmitter of claim 1 , wherein the first signal processor is further programmed to modulate the integer number of subcarriers ...

SYSTEMS AND METHODS FOR DETERMINING AND COMPENSATING FOR OFFSETS IN RF COMMUNICATIONS

Systems and methods for identifying and compensating for offsets in received transmission signals in accordance with embodiments of the invention are disclosed. In one embodiment, a vehicle telematics device includes a processor, a transceiver connected to the processor, and a memory connected to the processor and storing a signal detection application, wherein the signal detection application directs the processor to command the transceiver to acquire a transmitted signal based on a set of listening parameters, store the transmitted signal as received signal data, determine the presence of a signal offset by determining monotonicity in the received signal data, generate offset data based on the determined monotonicity, command the transceiver to adjust at least one listening parameter based on the offset data, demodulate the received signal data based on the adjusted listening parameters, and issue a low power command signal. 1. A vehicle telematics device , comprising:a processor;a transceiver connected to the processor; anda memory connected to the processor and storing a signal detection application; command the transceiver to acquire a transmitted signal based on a set of listening parameters;', 'store the transmitted signal as received signal data;', 'determine a presence of a signal offset by determining monotonicity in the received signal data;', 'generate offset data based on the determined monotonicity;', 'command the transceiver to adjust at least one listening parameter based on the offset data;', 'demodulate the received signal data based on the adjusted listening parameters; and', 'issue a low power command signal., 'wherein the signal detection application directs the processor to2. The vehicle telematics device of claim 1 , wherein the determination of a signal offset is based on a subset of the received signal data.3. The vehicle telematics device of claim 1 , wherein the signal detection application further directs the processor to examine received ...

Multi-dimensional signal encoding

Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for communicating signals using a multi-dimensional symbol constellation. In one example, a process for modulating a carrier signal includes the actions of mapping data to symbols of a multi-dimensional symbol constellation that includes at least three dimensions, each dimension of the constellation represented by a respective modulation signal. The dimensions of the constellation include first and second dimensions each of which are represented by respective in-phase modulation values and quadrature phase modulation values of a quadrature amplitude modulation (QAM) signal, and a third dimension represented by a transpositional modulation (TM) signal. The method further includes modulating a carrier signal with the TM signal and the QAM signal.

MULTIPLEXING LARGE PAYLOADS OF CONTROL INFORMATION FROM USER EQUIPMENTS

An apparatus and method for transmitting Uplink Control Information (UCI) over a Physical Uplink Control CHannel (PUCCH) in a communication system. A method includes acquiring, by a user equipment (UE), from an evolved Node B (eNB), information for a PUCCH format associated with multiple cells; generating, by the UE, UCI to be transmitted; encoding, by the UE, the UCI; performing, by the UE, a Fourier transform (FT) operation on the encoded UCI; performing, by the UE, an inverse Fourier transform (IFT) operation on the Fourier transformed UCI; and transmitting, by the UE, the inverse Fourier transformed UCI using the PUCCH format. 1. A method for transmitting uplink control information (UCI) over a physical uplink control channel (PUCCH) in a communication system , the method comprising:acquiring, by a user equipment (UE), from an evolved Node B (eNB), information for a PUCCH format associated with multiple cells;generating, by the UE, UCI to be transmitted;encoding, by the UE, the UCI;performing, by the UE, a Fourier transform (FT) operation on the encoded UCI;performing, by the UE, an inverse Fourier transform (IFT) operation on the Fourier transformed UCI; andtransmitting, by the UE, the inverse Fourier transformed UCI using the PUCCH format.2. The method of claim 1 , further comprising modulating the encoded UCI before performing the FT operation.3. The method of claim 2 , wherein the encoded UCI is modulated by using quadrature phase shift keying (QPSK).4. The method of claim 1 , wherein the UCI comprises at least one of a channel quality indicator (CQI) claim 1 , a precoding matrix indicator (PMI) claim 1 , a rank indicator (RI) claim 1 , and a hybrid automatic repeat request-acknowledgement (HARQ-ACK) related to at least one of the multiple cells.5. The method of claim 1 , wherein the PUCCH format is a PUCCH format 3.6. A transmitter for transmitting uplink control information (UCI) over a physical uplink control channel (PUCCH) in a communication system ...

ANTENNA MODULATION METHOD APPLICABLE TO WIRELESS TRANSMITTER AND TRANSMITTER USING THE SAME

An antenna modulation method applicable to a transmitter comprising a processing unit which is configured to execute functions including at least but not limited to receiving a symbol represented by a bit stream; converting the bit stream into a coordinate point of a signal constellation comprising a horizontal-axis component and a vertical-axis component; converting, from the horizontal-axis component of the coordinate point, a first vector having at least a first entry and a second entry; converting, from the vertical-axis component of the coordinate point, a second vector having at least a third entry and a fourth entry; generating a third vector having at least a fifth entry and a sixth entry by summing the first vector and the second vector; and activating at least one of the first antenna and the second antennas based on one or more non-zero entries of the third vector. 1. An antenna modulation method applicable to a transmitter comprising a processing unit which is configured to execute functions comprising:receiving a symbol represented by a bit stream;converting the bit stream into a coordinate point of a signal constellation comprising a horizontal-axis component and a vertical-axis component;converting, from the horizontal-axis component of the coordinate point, a first vector having at least a first entry and a second entry, wherein the first entry and the second entry of the first vector map to at least one of a first antenna and a second antenna;converting, from the vertical-axis component of the coordinate point, a second vector having at least a third entry and a fourth entry, wherein the at least third entry and the fourth entry of the second vector map to at least one of the first antenna and the second antenna;generating a third vector having at least a fifth entry and a sixth entry by summing the first vector and the second vector, wherein the fifth entry and the sixth entry map to at least one of the first antenna and the second antenna; ...

DATA PROCESSING FOR AUTOMATIC MODULATION CLASSIFICATION OF WIRELESS SIGNALS

Systems and methods for classifying a modulation scheme of a wireless signal are described. In some embodiments, a system receives a wireless signal modulated based on a modulation scheme having a constant modulus. The system can generate a resampled signal from the wireless signal based on features extracted from the wireless signal and perform blind equalization on the resampled signal based on a constant modulus criterion to generate an equalized signal. Then, the system can cause a modulation classifier to classify the received wireless signal to a modulation scheme from a plurality of predetermined modulation schemes based on the equalized signal. By preconditioning the wireless signal to reduce feature variability imparted by a propagation channel onto the wireless signal, the system can increase the classification accuracy of the modulation classifier. 1. A method for classifying a modulation scheme of a wireless signal , comprising:receiving a wireless signal modulated based on a modulation scheme having a constant modulus;generating a resampled signal from the wireless signal based on features extracted from the wireless signal, the features comprising an estimated center frequency and an estimated bandwidth of the wireless signal;performing blind equalization on the resampled signal based on a constant modulus criterion to generate an equalized signal; andcausing a modulation classifier to classify the received wireless signal to a modulation scheme from a plurality of predetermined modulation schemes based on the equalized signal.2. (canceled)3. The method of claim 1 , wherein the features comprise an oversampling rate.4. The method of claim 1 , wherein generating the resampled signal comprises:filtering the wireless signal to determine the estimated center frequency and the estimated bandwidth of the wireless signal; andresampling the wireless signal based on the estimated center frequency and the estimated bandwidth to generate the resampled signal.5. ...

HIGH SPEED INTERLEAVER/DEINTERLEAVER DEVICE SUPPORTING LINE RATE, AND METHOD THEREOF

A deinterleaver device, a method for deinterleaving, an interleaver device, and a method for interleaving are disclosed. The method for deinterleaving includes: providing a memory and a stream count for a frame; virtually dividing the memory into equal sections, wherein a section count equals the stream count; calculating a write address for a sample of the samples based on a location of the sample in the frame and a correspondence of the location to one of the sections; receiving the sample; and writing the received sample to the write address, wherein the calculating and the write address corresponds to a correct deinterleaving location in one of the sections for the sample. 121-. (canceled)22. A method for interleaving soft decisions for a frame , the method comprising:providing a memory and a stream count selected from n-different supported stream counts;virtually dividing the memory into x-rows, y-columns and the y-columns into equal sections, wherein y is calculated as a common denominator of a majority of the n-different counts, x is at least a length of samples divided by y, and the y-columns are subdivided into equal sections wherein a section count equals the stream count;collecting soft decisions sequentially, wherein the soft decisions number less than or equal to a frame size of the frame;calculating, for each respective soft decision, a write address comprising a row of the x-rows and a column of the y-columns based on a location of the respective soft decision, wherein a next column of the y-columns is set as the column every x soft decisions; andwriting the respective soft decision to a respective write address of the memory.23. The method of claim 22 , wherein a frame length of the soft-decisions in the frame is variable.24. The method of claim 22 , wherein the frame comprises 64 claim 22 ,800 soft-decisions claim 22 , each soft decision of the soft decisions is 6-bits claim 22 , the frame is modulated using a modulation type having 1 claim 22 , 2 ...

METHOD AND AN APPARATUS FOR DETERMINING A NOISE SHAPED QUANTIZED PARAMETER CONTRIBUTING TO THE GENERATION OF AN OUTPUT SIGNAL

A method for determining a noise shaped quantized parameter contributing to generation of an output signal comprises estimating an error within the output signal using a quantization of the parameter and a quantization of a further parameter contributing to generation of the output signal. The quantization of the parameter is used as the noise shaped quantized parameter according to a selection criterion. 1. (canceled)2. A method for determining a noise shaped quantized parameter contributing to generation of an output signal , comprising:calculating a first estimated error within the output signal using a first quantization of the parameter and a first quantization of the further parameter;calculating a second estimated error within the output signal using a second quantization of the parameter and the first quantization of the further parameter; andusing the quantization of the parameter resulting in the lower estimated error as the noise shaped quantized parameter.3. The method of claim 2 , further comprising:calculating a third estimated error within the output signal using the first quantization of the parameter and a second quantization of the further parameter;calculating a fourth estimated error within the output signal using the second quantization of the parameter and the second quantization of the further parameter; andusing the quantization of the parameter and the quantization of the further parameter resulting in the lowest estimated error as the noise shaped quantized parameter and as a noise shaped quantized further parameter.4. The method of claim 2 , wherein the first quantization corresponds to the smallest possible distance between the first quantization of the parameter and the parameter; andwherein the second quantization corresponds to the second smallest possible distance between the second quantization of the parameter and the parameter for the quantization scheme used.5. The method of claim 2 , wherein calculating the first estimated error ...

METHODS FOR FREQUENCY DIVISION MULTIPLEXED ON-OFF KEYING SIGNALS FOR WAKE-UP RADIOS

An access point (AP) that supports the IEEE 802.11ba protocol may transmit a frame including a physical layer (PHY) preamble to one or more stations (STAs) over a channel. The PHY preamble may include a plurality of repeated modulated legacy signal (L-SIG) fields to spoof a recipient of the frame and protect a wake up signal (WUS) to be subsequently transmitted by the AP. The AP may transmit the WUS to at least a first STA of the one or more STAs, wherein the at least the first STA is a IEEE 802.11ba compliant STA. 1. A method for use in an access point (AP) that supports the IEEE 802.11ba protocol , the method comprising:transmitting a frame including a physical layer (PHY) preamble to one or more stations (STAs) over a channel, wherein the PHY preamble comprises a plurality of repeated modulated legacy signal (L-SIG) fields to spoof a recipient of the frame and protect a wake up signal (WUS) to be subsequently transmitted by the AP; andtransmitting the WUS to a at least a first STA of the one or more STAs, wherein the at least the first STA is a IEEE 802.11ba compliant STA.2. The method of claim 1 , wherein the plurality of repeated modulated L-SIG fields cause at least a second STA of the one or more STAs to set its network allocation vector (NAV) claim 1 , wherein the at least the second STA supports an IEEE 802.11 protocol other than IEEE 802.11ba.3. The method of claim 1 , wherein the WUS comprises a narrow band on-off keying (OOK) signal transmitted using Manchester coding.4. The method of claim 1 , wherein the PHY preamble further comprises one or more legacy fields including a legacy short training field (L-STF) and a legacy long training field (L-LTF).5. The method of claim 1 , wherein the plurality of repeated modulated L-SIG fields comprise at least two repetitions of a first modulated L-SIG field.6. The method of claim 1 , wherein the plurality of repeated modulated L-SIG fields are modulated using binary phase shift keying (BPSK) or quadrature phase ...

C/N RATIO DETECTION CIRCUIT AND SIGNAL RECEIVING CIRCUIT

A C/N ratio detection circuit includes a voltage detector, an averaging section, a time variation range calculator, and a C/N ratio calculator. The voltage detector measures an input voltage of a signal. The averaging section calculates an average of the input voltage over a predetermined time. The time variation range calculator calculates a time variation range of the input voltage over the predetermined time. The C/N ratio calculator calculates a C/N ratio of the signal by using the average and time variation range of the input voltage. 1. A carrier to noise (C/N) ratio detection circuit comprising:a voltage detector that measures an input voltage of a signal;an averaging section that calculates an average of the input voltage over a predetermined time;a time variation range calculator that calculates a time variation range of the input voltage over the predetermined time; anda C/N ratio calculator that calculates a C/N ratio of the signal by using the average and the time variation range.2. The C/N ratio detection circuit according to claim 1 , whereinthe voltage detector is electrically connected to an output terminal of a bandpass filter and measures a voltage of a signal output from the bandpass filter as the input voltage,the C/N ratio detection circuit further comprises a time variation range correction section that, when a value of the time variation range is less than a reference value set in accordance with a bandwidth of the bandpass filter, corrects the value of the time variation range so that the value of the time variation range becomes the reference value, andwhen the value of the time variation range is less than the reference value, the C/N ratio calculator calculates the C/N ratio by using the average and the value of the time variation range corrected by the time variation range correction section.3. The C/N ratio detection circuit according to claim 1 , whereinthe voltage detector is electrically connected to an output terminal of a bandpass ...

COMMUNICATION DEVICE WITH PHASE/ANGLE TRANSFORMATION AND METHODS FOR USE THEREWITH

A communication device includes antennas to receive a first signal from a remote device, wherein the first signal corresponds to a first operational mode. A baseband processor selects either a first operational mode for transmitting a second signal or a second operational mode for transmitting the second signal. When the second operational mode is selected the baseband processor transforms the phase-related information corresponding to the first operational mode to transformed phase-related information corresponding to the second operational mode. The antennas transmit the second signal to the remote device in accordance with the transformed phase-related information corresponding to the second operational mode.

SIGNAL DETECTION METHOD FOR NON-COHERENT DETECTION IN A CHIRP SPREAD SPECTRUM COMMUNICATION SYSTEM

A system and methods for transmission and non-coherent detection of data signals modulated by a plurality of overlapping chirps in a chirp spread spectrum communication system (CSS). Data signals input to an adaptive overlapping transmitter are modulated by a plurality of overlapping chirps and transmitted over a wireless communication system to a non-coherent receiver. The coherent receiver includes a chirp matched filter which matches the chirps to an internal chirp signal, a delay filter which delays each chirp, a multiplier which multiplies each delayed chirp by a next chirp, an integrator which sums the amplitudes of the chirps and decision circuitry which determines the polarity of each sum and outputs a stream of ones and zeroes representing the data signals. 116-. (canceled)17. A communication signal detection method for a chirp spread spectrum communication system (CSS) , comprising:{'sub': 'b,new', 'receiving an encoded stream of data signals modulated by a plurality of overlapping chirps by a non-coherent receiver at non-coherent FIR chirp matched filter, the encoded stream having a data rate, T, wherein the encoded stream of data signals is generated with a differential phase shift keying (DPSK) convertor;'}{'sub': 'b,old', 'generating an internal chirp signal by a non-coherent finite impulse response (FIR) chirp matched filter, the internal chirp signal having an FT product equal to a sweep frequency (F) multiplied by the inverse of the data rate of the chirp spread spectrum communication system, T;'}matching the encoded stream to the internal chirp signal and generating a stream of first chirp matched signals;delaying each first chirp matched signal by a FIR delay filter and generating a second chirp matched signal which is phase shifted from the first chirp matched signal;multiplying the second chirp matched signal by the first chirp matched signal and generating a stream of multiplied chirp matched signals each having a main lobe;integrating a ...

Systems And Methods For Electronically Scanned Array Antennas

An array of antennas includes transmitter and receiver circuits. The transmitter includes a digital-to-analog converter (DAC), splitter and filter circuits, mixer circuits, and antennas. The DAC circuit converts a digital signal into an analog signal. The splitter and filter circuits separate frequencies of the analog signal into split signals. The mixer circuits multiply frequencies from the split signals by different frequencies of carrier signals to generate modulated signals that are converted by the antennas into radio frequency (RF) signals. The receiver includes antennas, mixer circuits, a summing circuit, and an analog-to-digital converter (ADC). The antennas in the receiver receive RF signals that are converted into electrical signals. The mixer circuits multiply frequencies from the electrical signals with different frequencies of carrier signals. The outputs of the mixer circuits are summed by the summing circuit to generate a summed signal that is converted to digital by the ADC. 1. An electronically scanned array antenna system comprising a receiver circuit , wherein the receiver circuit comprises:first antennas that generate first received signals indicative of frequencies of first radio frequency signals received by the first antennas;first mixer circuits that multiply frequencies from the first received signals by frequencies of carrier signals to generate first demodulated signals, wherein each of the carrier signals has a unique frequency relative to the other ones of the carrier signals;a first summing circuit that sums frequencies from each of the first demodulated signals to generate a first summed signal; anda first analog-to-digital converter circuit that converts the first summed signal into a first digital signal having frequencies that are generated based on each of the first received signals generated by the first antennas.2. The electronically scanned array antenna system of claim 1 , wherein the receiver circuit further comprises: ...

METHOD OF SIGNAL GENERATION AND SIGNAL GENERATING DEVICE

A transmission method simultaneously transmitting a first modulated signal and a second modulated signal at a common frequency performs precoding on both signals using a fixed precoding matrix and regularly changes the phase of at least one of the signals, thereby improving received data signal quality for a reception device. 1. A signal generation method comprising:phase-changing baseband signals with respective phase changing patterns to generate respective phase-changed signals, each of the phase changing patterns being different from each other; andinverse-fast-Fourier-transforming the phase-changed signals to respective OFDM transmission signals, whereineach phase changing pattern has N candidates for an amount of change in a phase, N being an integer greater than two,each candidate is periodically selected from the N candidates based on subcarriers of the OFDM transmission signal, a phase of the baseband signal being changed by the each candidate.2. A signal generation apparatus comprising:phase change circuit configured to phase-change baseband signals with respective phase changing patterns to generate respective phase-changed signals, each of the phase changing patterns being different from each other; andinverse fast Fourier transform circuit configured to inverse-fast-Fourier-transform the phase-changed signals to respective OFDM transmission signals, whereineach phase changing pattern has N candidates for an amount of change in a phase, N being an integer greater than two,each candidate is periodically selected from the N candidates based on subcarriers of the OFDM transmission signal, a phase of the baseband signal being changed by the each candidate. This application is a continuation of U.S. application Ser. No. 16/239,145, filed Jan. 3, 2019, which is a continuation of U.S. application Ser. No. 15/987,016, filed May 23, 2018, now U.S. Pat. No. 10,225,123, which is a continuation of application Ser. No. 15/496,406, filed Apr. 25, 2017, now U.S. Pat. ...

M-ary Differential Chaos Shift Keying Method Based On Chaotic Shape-forming filter

The present disclosure discloses an M-ary DCSK method based on chaotic shape-forming filtering. The method includes the following steps: at S1, parameters of a communication system are set; at S2, HP information and LP information to be sent in each time slot are prepared; at S3, the information to be sent is modulated; at S4, a chaotic carrier is generated through a chaotic shape-forming filter; at S5, a transmitted signal is prepared; at S6, down-carrier frequency and matched filter is performed to a received signal; at S7, the sampling of a maximum SNR point is performed to an output signal of a matched filter; at S8, the decision of high priority information bits is resumed; and at S9, the decision of low priority information bits is resumed. 2. The M-ary DCSK method based on chaotic shape-forming filter as claimed in claim 1 , wherein an operation at Step 2 comprises:{'sub': l', '1', '2', 'l', 'N', {'sub2': 's'}, '1', '2', 'N', {'sub2': 's'}], 'sup': HP', 'HP', 'HP', 'HP', 'LP', 'LP', 'LP', 'LP, 'preparing HP information B=(b,b, . . . , b) and LP information B=(b,b, . . . ,b) to be sent in each transmission time slot, wherein a value of each information bit to be sent is 1 or 0.'}5. The M-ary DCSK method based on chaotic shape-forming filter as claimed in claim 4 , wherein an operation at Step 5 comprises: {'br': None, 'i': T=u', 't', 'f', 't, 'sub': 'c', '()·sin(2π);'}, 'performing digital up-carrier processing to the chaotic carrier signal u(t) to obtain a channel transmission signal T(t), and an expression of the T(t) is{'sub': 'c', 'wherein fis a digital up-carrier frequency.'} The present disclosure claims priority of Chinese Patent Application No. 201910655934.1, filed to China Patent Office on Jul. 19, 2019. Contents of the present disclosure are hereby incorporated by reference in entirety of the Chinese Patent Application.The present disclosure relates to the technical field of Chaotic Spread Spectrum (CSS) Communication, and in particular to an M-ary ...

INFORMATION TRANSMISSION METHOD AND DEVICE

An information transmission method and a device are provided. The information transmission method includes: receiving, by a terminal device, downlink control information sent by a network device, the downlink control information including a resource allocation field, the resource allocation field being used to indicate allocated resource block(s) or a subcarrier resource. The method further includes determining, by the terminal device, an allocated resource based on the downlink control information, and sending information on the allocated resource. According to the method and the device provided in embodiments of this application, a coverage capability of a network is improved, and the method and the device may be applied to the internet of things, for example, MTC, IoT, LTE-M, and M2M. 2. The method according to claim 1 , wherein the terminal device is at a coverage enhancement level 0 or a coverage enhancement level 1 claim 1 , or in a coverage enhancement mode A;wherein the downlink control information further comprises a first field, a size of the first field being 2 bits, and the first field has three bit states respectively indicating three different quantities of resource units,', 'the first field has one bit state indicating that the resource allocation field is used to indicate the one or more allocated resource blocks, or', 'the first field indicates a quantity of resource units and the resource allocation field indicates the subcarrier resource allocation., 'wherein at least one of3. The method according to claim 2 , wherein a bit state 00 of the first field or a bit state 11 of the first field indicates that the resource allocation field is used to indicate the one or more allocated resource blocks.4. The method according to claim 1 , wherein K=5 claim 1 , M=5 claim 1 , L=5 claim 1 , and the subcarrier resource indicated by the resource allocation field is three subcarriers or six subcarriers;wherein K=3, M=5, L=5, and the subcarrier resource indicated ...

Position determination of a mobile station using modified wi-fi signals

Position determination for a mobile station is achieved through the modification of certain Wi-Fi access point and station signals, that are radiated by a certain master (i.e., guiding) base station, combined with slave (i.e., guided) stations having known coordinates, and processing the signals received from these base stations at the mobile station to determine the desired position.

APPARATUS FOR TRANSMITTING BROADCAST SIGNALS, APPARATUS FOR RECEIVING BROADCAST SIGNALS, METHOD FOR TRANSMITTING BROADCAST SIGNALS AND METHOD FOR RECEIVING BROADCAST SIGNALS

The present invention provides a method of transmitting broadcast signals. The method includes, formatting input streams into Data Pipe, DP, data; Low-Density Parity-Check, LDPC, encoding the DP data according to a code rate; bit interleaving the LDPC encoded DP data; mapping the bit interleaved DP data onto constellations according to one of QAM (Quadrature Amplitude Modulation), NUQ (Non-Uniform QAM) or NUC (Non-Uniform Constellation); Multi-Input Multi-Output, MIMO, encoding the mapped DP data by using a MIMO encoding matrix having a MIMO encoding parameter; building at least one signal frame by mapping the MIMO encoded DP data; and modulating data in the built signal frame by an Orthogonal Frequency Division Multiplexing, OFDM, method and transmitting the broadcast signals having the modulated data. 116-. (canceled)17. A method of transmitting broadcast signals , the method including: encoding service data according to coding rates;mapping the encoded service data onto symbols in Non-Uniform Constellation (NUC);Multi-Input Multi-Output (MIMO) encoding the mapped symbols by using a MIMO encoding matrix having a MIMO encoding parameter, wherein value of the MIMO encoding parameter is variable based on types of the NUC and the coding rates;time interleaving the MIMO encoded service data;building at least one signal frame including the time interleaved service data;frequency interleaving data in the built at least one signal frame;modulating the frequency interleaved data by Orthogonal Frequency Division Multiplexing (OFDM) scheme; andtransmitting the broadcast signals having the modulated data.18. The method of claim 17 ,wherein one of the types of the NUC is NUC-16, and the coding rates is one of 10/15 or 11/15.19. The method of claim 17 ,wherein the MIMO encoding includes rotating the symbols, and applying complex phase rotation to one of the rotated symbols.20. The method of claim 17 , wherein the mapping the encoded service data further includes:mapping the ...

APPARATUS FOR ORTHOGONAL 16-QPSK MODULATED TRANSMISSION

An apparatus, method and article of manufacture comprise a transceiver coupled to a phased array of antenna elements that are configured into pluralities of antenna elements to generate N modes of orthogonal radio waves where N is equal to or greater than 2. The coupling is via a plurality of 16-quadrature phase shift key (16-QPSK) modulators, each which is coupled to a respective one of the pluralities of antenna elements to modulate data onto a respective one of the N modes of orthogonal radio waves, to cause each of the N modes to operate as an independent data channel. For the case of N=2 modes, two 16-QPSK modulators generate independent 16 -QPSK constellations, one for the first of the two modes and one for the second of the two modes, such that two 16-QPSK constellations are independent of each other, are orthogonal, and are on the same frequency. 1. An apparatus comprising:a phased array of antenna elements configured into pluralities of antenna elements, the pluralities of antenna elements configured to generate N modes of orthogonal angular orbital momentum (OAM) radio waves where N is equal to or greater than 2; and wherein each of the N modes of orthogonal (OAM) radio waves operates as an independent data channel, and', 'wherein the apparatus is configured to transmit the modulated orthogonal (OAM) radio waves, each on a respective one of the pluralities of antenna elements., 'a plurality of quadrature phase shift key (QPSK) modulators, each of the plurality of QPSK modulators configured to receive data bits as input and coupled to a respective one of the pluralities of antenna elements to modulate QPSK symbols onto a respective one of the N modes of orthogonal OAM radio waves,'}2. The apparatus of wherein N=2 and a first of the QPSK modulators provides a first QPSK constellation for a first mode and a second of the QPSK modulators provides a second QPSK constellation for a second mode claim 1 , and wherein the first QPSK constellation and the second ...

TRANSMITTER AND PARITY PERMUTATION METHOD THEREOF

A transmitter is provided. The transmitter includes: a Low Density Parity Check (LDPC) encoder configured to encode input bits to generate parity bits; a parity permutator configured to perform parity permutation by interleaving the parity bits and group-wise interleaving a plurality of bit groups including the interleaved parity bits; and a puncturer configured to select some of the parity bits in the group-wise interleaved bit groups, and puncture the selected parity bits, wherein the parity permutator group-wise interleaves the bit groups such that some of the bit groups are positioned at predetermined positions, respectively, and a remainder of the bit groups are positioned without an order within the group-wise interleaved bit groups so that the puncturer selects parity bits included in the some of the bit groups positioned at the predetermined positions sequentially and selects parity bits included in the remainder of the bit groups without an order. 2. The receiving method of claim 1 , wherein the transmitting apparatus encodes 6480 information bits according to the code rate of 6/15 to generate 9720 parity bits.3. The receiving apparatus of claim 1 , wherein the plurality of groups comprise 45 groups including 0to 44groups.5. The transmitting method of claim 4 , wherein the encoding comprises encoding 6480 information bits based on the code rate of 6/15 to generate 9720 parity bits. This application is a continuation of U.S. application Ser. No. 16/390,393, filed on Apr. 22, 2019, which is a continuation of U.S. application Ser. No. 15/058,318, filed on Mar. 2, 2016, which claims priority from Korean Patent Application No. 10-2015-0137185, filed on Sep. 27, 2015, and U.S. Provisional Application No. 62/127,056, filed on Mar. 2, 2015, the disclosures of which are incorporated herein in by reference in their entireties.Apparatuses and methods consistent with the exemplary embodiments of the inventive concept relate to a transmitter and a parity permutation ...

POWER AND RESOURCE EFFICIENT UPLINK DMRS SEQUENCES FOR IFDMA

A method of transmitting demodulation reference signals (DMRS) over one, three or five resource blocks (RBs) with Interleaved Frequency Division Multiple Access (IFDMA) from a wireless device to a wireless network node in a wireless network wherein Single Carrier Frequency Division Multiple Access (SC-OFDMA) is deployed in uplink, is provided. At least one of: a set of base sequences including thirty quadrature phase shifting keying, QPSK, sequences of length 6, 18 or 30 is determined, a demodulation reference signal sequence is derived from the determined set of base sequences, the demodulation reference signal sequence is multiplexed, and the multiplexed demodulation reference signal sequence is transmitted, by the wireless device, to the wireless network node. 2. (canceled)3. (canceled)4. The method of claim 1 , wherein the multiplexing is performed in a time domain claim 1 , the DMRS being transmitted in different SC-FDMA symbols.629-. (canceled)31. (canceled)32. (canceled)33. The wireless device of claim 30 , wherein the multiplexing is performed in a time domain claim 30 , the DMRS being transmitted in different SC-FDMA symbols.3436-. (canceled)38. (canceled)39. (canceled)40. The wireless device of claim 37 , wherein the deriving of the demodulation reference signal sequence from the set of base sequences includes decimating the set of base sequences comprises applying a cyclic shift to the base sequences and an orthogonal cover code. This disclosure relates to wireless communications, and in particular to a method and wireless device for using a reference signal sequence at a predetermined power level.In 3GPP Long Term Evolution (LTE) systems, data transmissions in both downlink. i.e. from a network node or base station such as an eNodeB (eNB) to a wireless device such as a User Equipment (UE) and uplink. i.e., from a wireless device or UE to a network node or base station or eNB, are organized into radio frames of 10 ms, each radio frame consisting of ten ...

Pll circuit, calibration method, and wireless communication apparatus

In the stop state of a VCO and an injection locked frequency divider, an ILFD controller sets the control parameter of an injection locked frequency divider on the basis of the frequencies of a reference signal and the frequency-divided signal measured according to the control parameter of the injection locked frequency divider. While the injection locked frequency divider is operated and in the stop state of the VCO, the ILFD controller sets the control parameter of the injection locked frequency divider on the basis of the frequencies of the reference signal and the frequency-divided signal measured according to the control parameter of the injection locked frequency divider.

Phase-Optimized Constant Envelope Transmission (POCET) Method, Apparatus And System

An apparatus and method for generating a composite signal includes electronics configured to modulate a carrier utilizing a finite set of composite signal phases to generate a composite signal, the finite set of composite signal phases being determined through an optimization process that minimizes a constant envelope for the phase modulated carrier, subject to constraints on desired signal power levels of the signals to be combined and either zero or one or more relative phase relationships between the signals. The apparatus and method can be extended to generating an optimized composite signal of different frequencies. 1. An apparatus for generating a constant envelope composite signal , comprising:a modulator configured to phase modulate a carrier signal utilizing a finite set of composite signal phases to combine three or more component signals, each having two or more phases, in order to generate and maintain the constant envelope composite signal; andcomputation circuitry configured to determine the finite set of composite signal phases through an optimization process that minimizes the power of the composite signal, subject to a plurality of intra-signal constraints for the component signals, said optimization process includes optimization of an objective function of the power of the composite signal.2. The apparatus for generating a composite signal of claim 1 , wherein the optimization process is further subject to one or more inter-signal constraints between the component signals.3. (canceled)4. The apparatus for generating the composite signal of claim 2 , wherein the inter-signal constraints are selected to minimize interference between signals that overlap in spectrum.5. The apparatus for generating the composite signal of claim 1 , wherein the component signals are M-ary digital modulations.6. The apparatus for generating the composite signal claim 5 , wherein the optimization process is further subject to one or more inter-signal constraints between ...

TECHNIQUES FOR INDICATING A FRAME FORMAT FOR TRANSMISSIONS USING UNLICENSED RADIO FREQUENCY SPECTRUM BANDS

The present disclosure, for example, relates to one or more techniques for indicating a frame format for transmissions using unlicensed radio frequency spectrum bands. A UE may receive, from a base station, a frame format indicator associated with a transmission opportunity for transmissions in an unlicensed radio frequency spectrum band. The UE may determine a time-division duplexing (TDD) configuration for the transmission opportunity based at least in part on the frame format indicator. 1. A method for wireless communication , comprising:receiving, from a base station, a frame format indicator associated with a transmission opportunity for transmissions in an unlicensed radio frequency spectrum band; anddetermining a time-division duplexing (TDD) configuration for the transmission opportunity based at least in part on the frame format indicator.2. The method of claim 1 , wherein the frame format indicator comprises a codeword associated with the TDD configuration.3. The method of claim 2 , further comprising:receiving the frame format indicator in a bit stream, wherein the length of the bit stream is determined by a number of cyclical extensions of the codeword.4. The method of claim 1 , wherein the frame format indicator is carried by at least one enhanced resource element group (eREG) of a resource block (RB).5. The method of claim 1 , wherein the frame format indicator is multiplexed with a second frame format indicator from a second base station.6. The method of claim 1 , further comprising:receiving the frame format indicator in a orthogonal frequency division multiplexing (OFDM) symbol before a downlink subframe of the transmission opportunity.7. The method of claim 1 , further comprising:receiving the frame format indicator before a first subframe of the transmission opportunity.8. The method of claim 1 , further comprising:receiving the frame format indicator during a middle portion of the transmission opportunity.9. The method of claim 1 , further ...

DISTRIBUTED ANTENNA SYSTEM FOR MIMO SIGNALS

A distributed antenna system (DAS) includes a master unit; a plurality of remote units communicatively coupled with the master unit and distributed to provide coverage within a service area, each of the remote units remotely located from the master unit and other remote units; a coupler element coupled to receive a plurality of MIMO signals, the MIMO signals including first and second MIMO signals, the coupler element configured to: introduce a phase shift in a first portion of the first MIMO signal to generate a first phase shifted portion of the first MIMO signal; combine the first phase shifted portion with a second portion of the second MIMO signal to generate a combined MIMO signal; and present the combined MIMO signal at a first output port of the coupler element; at least one antenna coupled with each remote unit and configured to receive the combined MIMO signal for transmission. 1. A distributed antenna system comprising:at least one master unit;a plurality of remote units communicatively coupled with the at least one master unit and distributed to provide coverage within a service area, each of the plurality of remote units remotely located from the at least one master unit and other remote units of the plurality of remote units; introduce a phase shift in a first portion of the first MIMO signal to generate a first phase shifted portion of the first MIMO signal;', 'combine the first phase shifted portion with a second portion of the second MIMO signal to generate a combined MIMO signal; and', 'present the combined MIMO signal at a first output port of the coupler element;, 'a coupler element coupled to receive a plurality of multiple-input and multiple-output (MIMO) signals, the plurality of MIMO signals including at least a first MIMO signal and a second MIMO signal, the coupler element configured toat least one antenna coupled with each of the plurality of remote units and configured to receive the combined MIMO signal for transmission.2. The ...

REFERENCE SIGNAL SENDING METHOD, REFERENCE SIGNAL RECEIVING METHOD, AND APPARATUS

Embodiments of the present invention provide a reference signal sending method, a reference signal receiving method, and an apparatus. A reference signal sending method includes: obtaining a reference signal sequence, where the reference signal sequence includes multiple bits and exclusive OR of every two bits separated by one bit in the multiple bits is 1; performing Gaussian Minimum Shift Keying GMSK modulation on the reference signal sequence; and sending a modulated reference signal sequence. In the embodiments of the present invention, a reference signal sequence is designed as a sequence in which exclusive OR of every two bits separated by one bit is 1, GMSK modulation is performed on the reference signal sequence, and the same reference signal sequence is used to perform channel estimation during GMSK demodulation. Compared with a case in which a pseudo random sequence is used as a pilot symbol, channel estimation accuracy is improved. 1. A reference signal sending method comprising:obtaining a reference signal sequence, wherein the reference signal sequence comprises multiple bits and exclusive OR of every two bits separated by one bit in the multiple bits is 1;performing Gaussian Minimum Shift Keying (GMSK) modulation on the reference signal sequence; andsending a modulated reference signal sequence.2. The method according to claim 1 , wherein the reference signal sequence is at least one of the following sequences: a first reference signal sequence claim 1 , a second reference signal sequence claim 1 , a third reference signal sequence claim 1 , or a fourth reference signal sequence claim 1 , whereinthe first reference signal sequence is a periodic sequence of a sequence 0, 0, 1, 1, the second reference signal sequence is a periodic sequence of a sequence 0, 1, 1, 0, the third reference signal sequence is a periodic sequence of a sequence 1, 0, 0, 1, and the fourth reference signal sequence is a periodic sequence of a sequence 1, 1, 0, 0.3. The method ...

Multi-level coded modulation for non-coherent communication

Disclosed are techniques related to wireless communication system in which multi-level encoded modulation (MLCM) is applied to non-coherent communication. In the proposed techniques, a small fraction of differential phase rotations or bits participating in differential symbol coding are protected with strong codes while other complementary differential phase rotations or bits are protected with weaker codes. Compared to conventional non-coherent communication techniques in which a uniform protection is applied to any fraction of differential phase rotation or any bit of a differential symbol, the proposed MLCM approach enables more spectrally efficient scheme.