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Небесная энциклопедия

Космические корабли и станции, автоматические КА и методы их проектирования, бортовые комплексы управления, системы и средства жизнеобеспечения, особенности технологии производства ракетно-космических систем

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Мониторинг СМИ

Мониторинг СМИ и социальных сетей. Сканирование интернета, новостных сайтов, специализированных контентных площадок на базе мессенджеров. Гибкие настройки фильтров и первоначальных источников.

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Форма поиска

Поддерживает ввод нескольких поисковых фраз (по одной на строку). При поиске обеспечивает поддержку морфологии русского и английского языка
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Применить Всего найдено 10410. Отображено 100.
05-01-2012 дата публикации

Apparatus for power wireless transfer between two devices and simultaneous data transfer

Номер: US20120001593A1
Автор: Mario Di Guardo
Принадлежит: STMICROELECTRONICS SRL

A system for the wireless transfer of power includes a first device connected to a power supply source and provided with a first resonant circuit at a first frequency, a second device comprising at least one battery, provided with a second resonant circuit at said first frequency, arranged at a distance smaller than the wavelength associated with said first frequency and not provided with wires for the electrical connection with said first device. The first device is adapted to transfer a first signal representing the power to be sent to the second device for charging said at least one battery and comprises means adapted to modulate the frequency of said first signal for transferring data from the first device to the second device simultaneously with the power transfer. The second device comprises means adapted to demodulate the received signal, corresponding to the first signal sent from the first device, to obtain the transmitted data.

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Номер записи: 1
18-01-2017 дата публикации

Устройство для приёма частотно-манипулированных сигналов

Номер: RU0000168110U1
Автор: Владимир Сергеевич Савватеев, Леонид Феодосиевич Головаха, Сергей Евгеньевич Янчиков
Принадлежит: Акционерное общество "Концерн воздушно-космической обороны "Алмаз - Антей"

Полезная модель относится к технике связи. Устройство для приема частотно–манипулированных сигналов содержит полосовой фильтр и канал обработки синфазной составляющей принимаемого сигнала, включающий первый и второй сумматоры, причем к первым входам первого и второго сумматоров подключены соответственно первая и вторая линии задержки. При этом входы первой и второй линий задержки и вторые входы первого и второго сумматоров соединены и являются входом канала обработки синфазной составляющей принимаемого сигнала, выходы первого и второго сумматоров соединены с входами соответственно первого и второго двухполупериодных выпрямителей. При этом выход вычитающего блока соединен со входом фильтра низких частот, причем выход фильтра низких частот является выходом канала обработки синфазной составляющей принимаемого сигнала. В устройство введены дополнительная линия задержки, которая соединена входом с выходом первого амплитудного ограничителя, а выходом со входом канала обработки синфазной составляющей принимаемого сигнала, выходной сумматор, который соединен первым входом с выходом канала обработки синфазной составляющей сигнала, а выходом с входом решающего блока, преобразователь Гильберта, соединенный входом с выходом полосового фильтра, второй амплитудный ограничитель, который соединен входом с выходом преобразователя Гильберта, и канал обработки квадратурной составляющей принимаемого сигнала, аналогичный каналу обработки синфазной составляющей принимаемого сигнала.Техническим результатом полезной модели является повышение помехоустойчивости устройства.1 ил. РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) (13) 168 110 U1 (51) МПК H04L 27/14 (2006.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ (12) ФОРМУЛА ПОЛЕЗНОЙ МОДЕЛИ К ПАТЕНТУ РОССИЙСКОЙ ФЕДЕРАЦИИ (21)(22) Заявка: 2016110394, 22.03.2016 (24) Дата начала отсчета срока действия патента: 22.03.2016 (73) Патентообладатель(и): Акционерное общество "Концерн воздушно-космической обороны "Алмаз Антей" (RU) 18.01.2017 Приоритет(ы ...

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Номер записи: 2
02-02-2012 дата публикации

System and method for joint voice and data transmission

Номер: US20120027006A1
Автор: Ali Haldun Taner, Ayman Ahmed Abdel-Samad, Christopher Harris Snow, Dinesh Kumar Arora, Nazih Almalki
Принадлежит: Research in Motion Ltd

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.

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Номер записи: 3
02-02-2012 дата публикации

Demodulation circuit, digital microwave system and demodulation method

Номер: US20120027129A1
Автор: Guixue Zhao, Tianxiang Wang
Принадлежит: Huawei Technologies Co Ltd

A demodulation circuit, a digital microwave system including the demodulation circuit, and a signal demodulation method are provided. The demodulation circuit includes a first circuit, a second circuit, a third circuit, and a fourth circuit connected in turn. The fourth circuit includes a pulse counting unit and a data decision unit connected in turn. The signal demodulation method includes: performing bandpass filtering on input signals; increasing gains of the bandpass filtered signals; extracting pulse signals are extracted from the gain-increased signals; counting the extracted pulse signals; filtering the pulse signals having counting values falling outside of a predetermined range, and outputting the filtered pulse signals.

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Номер записи: 4
02-02-2012 дата публикации

Gfsk receiver architecture and methodology

Номер: US20120027132A1
Автор: Robert E. Rouquette
Принадлежит: Sensus USA Inc

A Gaussian Frequency Shift Key (GFSK) receiver includes a receiver front end to receive a GFSK-modulated signal and convert the received GFSK-modulated signal to a baseband frequency modulated signal, a channel filter to reduce channel interference which is adjacent to a desired channel of the baseband frequency modulated signal, a demodulator to demodulate the channel filtered baseband modulated signal and to recover a sequence of symbols, a digital filter to reduce inter-symbol interference (ISI) from the sequence of symbols, a slicer to produce symbol decisions based on the filtered sequence of symbols, and a symbol-to-bit mapper to map the symbol decisions to data bits.

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Номер записи: 5
29-03-2012 дата публикации

Harmonic transmission of data

Номер: US20120076212A1
Автор: Robert Zeppetelle, Stanley E. McHann, Jr.
Принадлежит: Hunt Tech LLC

Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for communicating using harmonic tones. In one aspect, a method includes receiving harmonic tones that represent data being reported by a node that generated the harmonic tones; selecting data that are represented by each of the harmonic tones; and providing the data that are represented by the harmonic tones.

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Номер записи: 6
05-04-2012 дата публикации

System and Method for Phase Detection

Номер: US20120082247A1
Автор: Claudio G. Rey, Jeffrey D. Ganger
Принадлежит: Individual

A method may include performing a logical exclusive OR and a logical inverse exclusive or on an input reference signal and an output signal to generate an XOR signal and an XNOR signal, respectively. The method may also include generating a switch control signal indicative of whether a first phase of the input reference signal leads or lags a second phase of the output signal. The method may additionally include: (i) transmitting the XOR signal to an output of a switch if the first phase leads the second phase; and (ii) transmitting the XNOR signal to the output of the switch if the first phase lags the second phase. The method may further include generating a phase detector output signal indicative of a phase difference between the second phase based on a signal present on the output of the switch.

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Номер записи: 7
24-05-2012 дата публикации

Digital signal processing circuit for generating output signal according to non-overlapping clock signals and input bit streams and related wireless communication transmitters

Номер: US20120128092A1
Автор: Jie-Wei Lai, Yang-Chuan Chen
Принадлежит: MediaTek Inc

A digital signal processing circuit includes a combining stage and an output stage. The combining stage is arranged to receive a plurality of non-overlapping clock signals having a same frequency but different phases, receive a plurality of first input bit streams, and generate a first output bit stream by combining the first input bit streams according to the non-overlapping clock signals. The output stage is arranged to generate an output according to the first output bit stream. A digital signal processing method includes: receiving a plurality of non-overlapping clock signals having a same frequency but different phases; receiving a plurality of first input bit streams; generating a first output bit stream by combining the first input bit streams according to the non-overlapping clock signals; and generating an output according to the first output bit stream.

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Номер записи: 8
24-05-2012 дата публикации

Modulation method and device implementing a differential modulation, corresponding demodulation method and device, signal and computer software products

Номер: US20120131411A1
Автор: Ghaya Rekaya-Ben Othman, Sami Mumtaz, Yves Jaouen
Принадлежит: Telecom ParisTech

A method and apparatus are provided for modulating a binary source sequence including of a plurality of source words to generate modulated symbols. The method implements error-correction encoding of the plurality of source words, implementing one or more encoding modules, each implementing a separate error-correction code to generate a plurality of code words, the source words being encoded in series. The code words are interlaced to generate an interlaced sequence. The interlaced sequence is differentially modulated to generate modulated symbols. Each code word is broken down into at least one group with a number of bits equal to the base-2 logarithm of a number of states of a modulation implemented by the step of differentially modulating. The interlacing step distributes the groups such that two adjacent groups in the interlaced sequence belong to separate code words.

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Номер записи: 9
07-06-2012 дата публикации

Radio communication apparatus and radio communication method

Номер: US20120140687A1
Автор: Daichi Imamura, Seigo Nakao
Принадлежит: Panasonic Corp

Provided is a radio communication device which can make Acknowledgement (ACK) reception quality and Negative Acknowledgement (NACK) reception quality to be equal to each other. The device includes: a scrambling unit ( 214 ) which multiplies a response signal after modulated, by a scrambling code “1” or “e −j(π/2) ” so as to rotate a constellation for each of response signals on a cyclic shift axis; a spread unit ( 215 ) which performs a primary spread of the response signal by using a Zero Auto Correlation (ZAC) sequence set by a control unit ( 209 ); and a spread unit ( 218 ) which performs a secondary spread of the response signal after subjected to the primary spread, by using a block-wise spread code sequence set by the control unit ( 209 ).

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Номер записи: 10
19-07-2012 дата публикации

Cognitive multi-user ofdma

Номер: US20120182875A1
Автор: Amer A. Hassan, Christian Huitema
Принадлежит: Microsoft Corp

A computing device operating according to a frequency division multiplexed protocol in which communication occurs over a signal formed from a plurality of sub-channels selected from anywhere in a frequency spectrum. A computing device may select sub-channels cognitively by using information about sub-channels previously deemed suitable or unsuitable by that computing device or other computing devices. A described technique for determining sub-channel suitability includes analyzing radio frequency energy in the sub-channel to detect signals generated by another computing device or high noise levels. Information may also be used to cognitively select sub-channels to be analyzed, such as by first selecting for analysis previously-used sub-channels.

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Номер записи: 11
02-08-2012 дата публикации

Charging and Communication System for a Battery-Powered Microstimulator

Номер: US20120197352A1
Автор: Kenneth A. McGiboney, Rafael Carbunaru, Robert D. Ozawa
Принадлежит: Boston Scientific Neuromodulation Corp

A system and method are provided for both recharging and communicating with a stimulator having a rechargeable battery, which stimulator is implanted deeply in the body, in particular where the stimulator is a microstimulator, the system includes a base station and an external device, for instance a chair pad. The chair pad may contain an antenna/charging coil and a booster coil. The antenna/charging coil can be used for charging the rechargeable battery and also for communicating with the stimulator using frequency shift keying and on-off keying. The booster coil can be used to recharge a battery depleted to zero volts. The base station connected to the chair pad may be used to power the antenna/charging coil and the booster coil.

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Номер записи: 12
16-08-2012 дата публикации

Signaling to application lack of requested bandwidth

Номер: US20120207233A1
Автор: Amer A. Hassan, Christian Huitema, D. Gabriel Frost, Deyun Wu, Thomas W. Kuehnel
Принадлежит: Microsoft Corp

A system for signaling an application when a requested data rate and Quality of Service cannot be achieved using OFDM wireless data transmission, and the application proceeds by either renegotiating QoS and data rate, or waiting until they requested rate and QoS are met.

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Номер записи: 13
23-08-2012 дата публикации

Fsk demodulator

Номер: US20120212290A1
Автор: Takamitsu Hafuka
Принадлежит: Lapis Semiconductor Co Ltd

An FSK demodulator and a method for detecting an inflection point extract a greater amount of effective inflection points of a frequency detection signal while reducing erroneous detection of the inflection points. The inflection point detector includes an inflection point extraction part to extract the inflection point corresponding to variation of a sample value of an amplitude value of the frequency detection signal, an amplitude determination part to determine if a size between peak values of sample values in front and rear of the inflection point exists in a first predetermined range, a preamble determination part to determine if a difference between initial and final sample values of at least one of a symbol having the extracted inflection point and a right before symbol exists in a second predetermined range, and an AND operation part to determine a normal inflection point.

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Номер записи: 14
06-09-2012 дата публикации

Generalized frequency modulation

Номер: US20120224658A1
Автор: Rajendra Kumar
Принадлежит: Aerospace Corp

A receiver may comprise a complex mixer for converting the modulated signal to a complex modulated signal comprising a first in-phase component and a first quadrature component. The receiver may further comprise a digital demodulator. The digital demodulator may comprise at least one processor circuit programmed for applying a phase differencer for generating an output function in terms of a phase difference of the complex modulated signal. Applying the phase differencer may comprise converting the first in-phase component to a function of a phase difference of the first in-phase component expressed in digital time, and converting the first quadrature component to a function of the phase difference of the first quadrature component expressed in digital time. The at least one processor circuit of the digital demodulator may also be programmed for applying a four quadrant inverse tangent to the output function to generate the information signal.

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Номер записи: 15
20-09-2012 дата публикации

Apparatus and method for frequency shifting of a wireless signal and systems using frequency shifting

Номер: US20120236906A1
Автор: Ami Hazani, Yehuda Binder
Принадлежит: Ami Hazani, Yehuda Binder

Coverage for a wireless network is improved using a frequency shifting scheme. A wireless signal in a frequency band is shifted to another band, and carried in the shifted band to another location where the signal is shifted back to the original frequency band. The frequency shifting may utilize frequency shifting schemes such as mixer/filter and heterodyne. The wireless signal can be frequency shifted by converting it to other representing signals (such as I/Q components) and forming the frequency-shifted signal from the representations. The transmission medium may use dedicated wiring or existing service wiring in a residence or building, including LAN, telephone, AC power and CATV wiring. The system may be enclosed as a stand-alone unit, housed in integrated form as part of a service outlet or as a snap-on/plug-in module.

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Номер записи: 16
20-09-2012 дата публикации

Autocorrelation-based spectrum sensing for fm signals

Номер: US20120238227A1
Автор: Hou-Shin Chen, WEN Gao
Принадлежит: Individual

A method and system for detection of available a white space channel in an area of licensed transmitters includes a detector which utilizes the autocorrelation analysis of a channel in an frequency modulated (FM) band. Calculation of the autocorrelation excludes an initial set of correlation delay values such that large values of autocorrelation are removed. The remaining autocorrelation based on higher correlation delay values exposes the sinusoidal nature of an FM transmitter operating in the selected channel. White space becomes available to a user if no transmitter is detected using the autocorrelation detection method.

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Номер записи: 17
11-10-2012 дата публикации

Transmission and reception apparatus and method

Номер: US20120257688A1
Автор: Akihiko Matsuoka, Masayuki Orihashi, Yutaka Murakami
Принадлежит: Panasonic Corp

A transmission apparatus includes a plurality of orthogonal frequency division multiplexing (OFDM) modulation signal generators, which generate a first OFDM modulation signal and a second OFDM modulation signal. The transmission apparatus also includes a transmitter that transmits the first OFDM modulation signal from a first antenna and the second OFDM modulation signal from a second antenna, in an identical frequency band. A reception apparatus is provided, which includes a plurality of antennas that receive a plurality of OFDM modulation signals; a plurality of OFDM demodulators that transform the plurality of OFDM modulation signals to a plurality of reception signals using Fourier transform; an estimator that outputs a distortion estimation signal using one or more symbols for demodulation included in the plurality of reception signals; and a demodulator that compensates for distortion of the reception signals using the distortion estimation signal and demodulates a data symbol included in the reception signals.

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Номер записи: 18
29-11-2012 дата публикации

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

Номер: US20120300793A1
Автор: Chang Ho Yun, Jong Won Park, Sea Moon Kim, Seung Geun Kim, Sung Hoon Byun, Yong Kon Lim
Принадлежит: Korea Ocean Research and Development Institute (KORDI)

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.

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Номер записи: 19
29-11-2012 дата публикации

Radio transmitter system and method

Номер: US20120300870A1
Автор: Daniel L. Dickey
Принадлежит: Continental Electronics Corp

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.

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Номер записи: 20
13-12-2012 дата публикации

System and method for chirp-based transmission

Номер: US20120314730A1
Автор: John W. Mccorkle, Timothy R. Miller
Принадлежит: APPLIED SIGNALS INTELLIGENCE Inc

An electromagnetic transmission system is provided, comprising: M chirp generators, each operating at a first frequency, each of the M chirp generators being configured to generate an i th digital chirp portion comprising (1/M) th of a digital chirp signal having a set ramp rate; a parallel-in serial-out register configured to receive the M digital chip portions in parallel at the first frequency, and configured to output the M digital chip portions in series as the digital chirp signal at a second frequency; and a digital-to-analog converter operating at the second frequency and configured to convert the digital chirp signal into an analog chirp signal, wherein i is an index that goes from 1 to M, and wherein the second frequency is M times the first frequency.

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Номер записи: 21
13-12-2012 дата публикации

Transmitter and method for transmitting data block in wireless communication system

Номер: US20120314801A1
Автор: Jong Ee OH, Min Ho CHEONG, Sok Kyu Lee
Принадлежит: Electronics and Telecommunications Research Institute ETRI

Provided are a transmitter and a method for transmitting a data block in a wireless communication system. The method comprises the following steps: deciding the number of bits (s) and encoders (NES) to allocate to one axis of a signal constellation; encoding an information bit based on the s and the NES and generating a coded block; parsing the coded block based on the s and the NES and generating a plurality of frequency sub-blocks; and transmitting the plurality of frequency sub-blocks to a receiver.

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Номер записи: 22
13-12-2012 дата публикации

Transmitter and method for transmitting data block in wireless communication system

Номер: US20120314802A1
Автор: Jong Ee OH, Min Ho CHEONG, Sok Kyu Lee
Принадлежит: Electronics and Telecommunications Research Institute ETRI

Provided are a transmitter and a method for transmitting a data block in a wireless communication system. The method comprises the following steps: encoding an information bit and generating a block coded with an NCBPSS bit; generating two sub-blocks by parsing the coded block; and transmitting the two sub-blocks to the transmitter. By preventing the bits that are contiguous to the encoding block from having continuous identical reliabilities on a signal constellation, the deterioration of the decoding performance of the transmitter can be prevented.

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Номер записи: 23
20-12-2012 дата публикации

Method and device for transmitting uplink control information in wireless communication system

Номер: US20120320951A1
Автор: Han Gyu Cho, Jae Hoon Chung, Ji Woong Jang, Seung Hee Han, Seung Hyun Kang, Yeong Hyeon Kwon
Принадлежит: LG ELECTRONICS INC

Disclosed are a method and a device for transmitting uplink control information (UCI) by a terminal in a wireless communication system. The UCI transmission method comprises the steps of: generating an encoding information bit stream by performing channel coding for a UCI bit stream; generating complex modulation symbols by performing modulation for the generated encoding information bit stream; spreading the complex modulation symbols in block-wise on the basis of an orthogonal sequence; and transmitting the spread complex modulation symbols to a base station. The encoding information bit stream is generated by a channel coding for circularly repeating the UCI bit stream.

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Номер записи: 24
03-01-2013 дата публикации

Systems and methods for improved digital rf transport in distributed antenna systems

Номер: US20130003714A1
Автор: Dean Zavadsky, Jeffrey J. Cannon, Philip M. Wala
Принадлежит: ADC Telecommunications Inc

Systems and methods for improved digital RF transport in a DAS are provided. In one embodiment, a transceiver comprises: a receive path circuit including an RF reception interface coupled to an ADC, the ADC receiving a down-converted analog RF spectrum from the RF reception interface and producing a digitized RF spectrum at an input sampling rate; a logic device receiving the digitized RF spectrum and producing a first set of baseband data samples at a first sampling rate, corresponding to a first spectral region of the analog RF spectrum and a second set of baseband data samples at a second sampling rate, corresponding to a second spectral region of the analog RF spectrum. The logic device maps the first set and second sets of baseband data samples to a respective first set and second set of timeslots of a serial data stream transport frame.

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Номер записи: 25
21-03-2013 дата публикации

Polarization-Independent LCOS Device

Номер: US20130070326A1
Автор: Baxter Glenn Wayne, Frisken Steven James, Wu Qihong
Принадлежит: FINISAR CORPORATION

Described herein is an optical phase modulator () including a liquid crystal element (), disposed between a pair of opposing electrodes () and (). The electrodes () are electrically driven for supplying an electric potential V across the liquid crystal element () to drive the liquid crystals within element () in a predetermined configuration. Electrode () includes a grid of individually drivable pixel regions (), at least some of which include a sub-wavelength grating structure that provides an anisotropic refractive index profile in orthogonal lateral dimensions, thereby creating an effective material form birefringence. Light incident through liquid crystal element () and onto electrode () is reflected and experiences a relative phase difference of 180° between its constituent orthogonal polarization components, thereby rotating each polarization component into the orthogonal orientation upon reflection. 1. An optical phase modulator including:a liquid crystal element; anda pair of opposing electrodes disposed around said liquid crystal element for supplying an electric potential across said liquid crystal element to drive liquid crystals in a predetermined configuration;wherein a first said electrode includes a plurality of individually addressable pixels and at least a subset of said addressable pixels include an anisotropic material profile in orthogonal lateral dimensions such that incident light transmitted through said liquid crystal element and onto said first electrode is reflected and experiences a relative phase difference between its constituent orthogonal polarization components.2. An optical phase modulator according to wherein at least some of said addressable pixels including an anisotropic material profile are configured to introduce claim 1 , to said incident light claim 1 , a relative phase difference of substantially 180° claim 1 , thereby reflecting each polarization component in an orthogonal orientation.3. An optical phase modulator according ...

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Номер записи: 26
21-03-2013 дата публикации

FREQUENCY OFFSET ESTIMATION APPARATUS, FREQUENCY OFFSET ESTIMATION METHOD, AND RECEPTION METHOD

Номер: US20130070874A1
Автор: Ishihara Koichi, Kobayashi Takayuki, Kudo Riichi, Matsui Munehiro, Miyamoto Yutaka, Mizoguchi Masato, Nakagawa Tadao, Sano Akihide, Takatori Yasushi, Yamazaki Etsushi, Yoshida Eiji
Принадлежит: Nippon Telegraph and Telephone Corporation

Provided is a frequency offset estimation apparatus that appropriately estimates and compensates for a frequency offset of a received signal when estimating the frequency offset which is the difference between a carrier frequency of the received signal and the frequency of an output signal of a local oscillator. The frequency offset estimation apparatus converts the received signal sampled in advance with a predetermined sampling frequency into a frequency spectrum having N frequency components, limits a frequency band of negative frequency components from 1 to N/2 of the frequency spectrum and a frequency band of positive frequency components from N/2+1 to N of the frequency spectrum, calculates the sum of the squares of the positive frequency components of the frequency spectrum that have been subjected to frequency band limitation and the sum of the squares of the negative frequency components of the frequency spectrum that have been subjected to frequency band limitation to calculate power of the positive frequency components and power of the negative frequency components, and cyclically shifts all frequency components of the frequency spectrum in a frequency domain until the absolute value of a power difference between the power of the positive frequency components and the power of the negative frequency components is less than or equal to a predetermined threshold value, and estimates the frequency offset based on a shift amount until the absolute value is less than or equal to the threshold value. 1. A frequency offset estimation apparatus which estimates a frequency offset which is the difference between a carrier frequency of a received signal and the frequency of an output signal of a local oscillator , the apparatus comprising:a frequency domain conversion unit that converts the received signal sampled in advance with a predetermined sampling frequency into a frequency domain, and outputs a frequency spectrum having N frequency components to which numbers ...

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Номер записи: 27
04-04-2013 дата публикации

Method And System For Communicating Via A Spatial Multilink Repeater

Номер: US20130083828A1
Автор: Rofougaran Ahmadreza, Rofougaran Maryam
Принадлежит: BROADCOM CORPORATION

Aspects of a method and system for communicating via a spatial multilink repeater are provided. In this regard, a received signal may be frequency shifted to generate a plurality of repeated signals, wherein each repeated signal may be shifted by a different frequency with respect to the received signal. Each repeated signal may comprise one or more signal components and a phase and/or amplitude of each of the components may be controlled to control a directivity of the repeated signals. Each of the repeated signals may be generated by quadrature down-converting said received signal by mixing the received signal with a first LO signal pair, up-converting the down-converted signal by mixing it with a second LO signal pair, and adding or subtracting an in-phase portion and a quadrature-phase portion of the up-converted signal. 1. A method for signal processing , the method comprising:frequency shifting a received signal by a different amount to generate each of a plurality of repeated signals, wherein each of said plurality of repeated signals comprises one or more signal components; andcontrolling a phase and/or amplitude of each of said one or more signal components to control a directivity of each of said repeated signals.220-. (canceled) This patent application makes reference to:U.S. patent application Ser. No. 12/057,780, filed on Mar. 28, 2008; U.S. patent application Ser. No. 12/058,077, filed on Mar. 28, 2008; U.S. patent application Ser. No. ______ (Attorney Docket No. 19146US01) filed on even date herewith; and U.S. patent application Ser. No. ______ (Attorney Docket No. 19148US01) filed on even date herewith.Each of the above stated applications is hereby incorporated herein by reference in its entirety.Certain embodiments of the invention relate to signal processing. More specifically, certain embodiments of the invention relate to a method and system for communicating via a spatial multilink repeater.As the number of wireless devices and wireless ...

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Номер записи: 28
25-04-2013 дата публикации

Sub-Band Power Scaling Reporting and Sub-Band Transmit Power Estimation

Номер: US20130101055A1
Автор: Anand Dabak, Il Han Kim, Kumaran Vijayasankar, Ramanuja Venantham, Tarkesh Pande
Принадлежит: Texas Instruments Inc

Systems and methods for routing protocols for power line communications (PLC) are described. In some embodiments, a method performed by a PLC device, such as a PLC meter, may include selecting one or more transmit sub-bands on which to transmit frames, where the transmit sub-bands comprise groups of six carrier frequencies. The PLC device then generates a frame comprising a tone map that indicates which transmit sub-bands are used to carry data for the frame. The tone map using two bits per transmit sub-band to indicate a status of each transmit sub-band. The PLC device then transmits the frame on the selected transmit sub-bands using OFDM. A resolution bit and a mode bit may be used to provide additional information about the transmit sub-bands, such as an amount of power adjustment that has been applied to carrier frequencies and whether dummy bits are transmitted on unused carrier frequencies.

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Номер записи: 29
02-05-2013 дата публикации

Electronic device, method and system for half duplex data transmission

Номер: US20130107762A1
Автор: Andreas Hagl, Herbert Meier, Jim Childers
Принадлежит: TEXAS INSTRUMENTS DEUTSCHLAND GMBH, Texas Instruments Inc

An electronic device and method for half duplex data transmission in a long range keyless entry and go system, and more specifically to an RFID transponder, a corresponding read/write (R/W) unit and methods for operating the RFID transponder and the R/W-unit. There is a first coil, a second coil and a third coil, being arranged as a three-dimensional antenna, a first capacitor, a second capacitor and a third capacitor couplable in parallel to the first coil, the second coil and the third coil, respectively, for selectively forming a first, a second and a third parallel-resonant circuit for receiving radio signals, a series-resonant circuit for transmitting radio signals and a control stage configured to either use one of the first, second or third parallel-resonant circuits for receiving radio signals or the series-resonant circuit for transmitting signals.

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Номер записи: 30
02-05-2013 дата публикации

FREQUENCY SHIFT KEYING MODULATION AND DEMODULATION

Номер: US20130107919A1
Автор: Burns Kenneth, Malecek Kenneth
Принадлежит:

A communications adaptor comprises a receiver circuit, which can comprise a signal input configured to receive a frequency shift keyed (FSK) signal; a delay circuit in communication with the signal input and including a delayed signal output; a multiplier circuit in communication with the signal input and the delayed signal output, and the multiplier circuit can be configured to produce a serial bit steam from at least the signal input and the delayed signal output, the serial bit stream corresponds to one or more bits encoded with frequency shift keying in the FSK signal; and a signal output configured to output the serial bit stream. The communications adaptor also can comprise a transmitter circuit and a processor in communication with the receiver circuit and the transmitter circuit. 1. A communications adaptor , comprising: a signal input configured to receive a frequency shift keyed (FSK) signal;', 'a delay circuit in communication with the signal input and including a delayed signal output;', 'a multiplier circuit in communication with the signal input and the delayed signal output, the multiplier circuit configured to produce a serial bit steam from at least the signal input and the delayed signal output, the serial bit stream corresponds to one or more bits encoded with frequency shift keying in the FSK signal; and', 'a signal output configured to output the serial bit stream;, 'a receiver circuit, comprisinga transmitter circuit; and,a processor in communication with the receiver circuit and the transmitter circuit.2. The communications adaptor of claim 1 , wherein the delay circuit comprises a shift register.3. The communications adaptor of claim 2 , wherein the shift registers further comprises:a first receiver-transmitter configured to capture, in serial, a set of signal transitions of the FSK signal and output a byte-oriented data;a memory configured to receive the byte-oriented data from the first receiver/transmitter and output the byte-oriented data ...

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Номер записи: 31
09-05-2013 дата публикации

Physical Layer Frame Format Design for Wideband Wireless Communications Systems

Номер: US20130114764A1
Автор: Lou Hui-Ling, Nabar Rohit U., Palanivelu Arul Durai Murugan, Wu Songping, Zhang Hongyuan
Принадлежит: MARVELL WORLD TRADE LTD.

Systems and methods are provided for processing a payload portion of a received signal in a single carrier mode or a multiple carrier mode using a wireless channel receiver based on a portion of the received signal, where a signaling portion of the received signal is a single carrier signal. A single carrier signaling portion is received, and whether the payload portion of the signal is a single carrier signal or a multiple carrier signal is detected from the received single carrier signaling portion. The payload portion of the received signal is demodulated in a single carrier mode if the detecting determines that the payload portion of the received signal is a single carrier signal, and the payload portion of the received signal is demodulated in a multiple carrier mode if the detecting determines that the payload portion of the received signal is a multiple carrier signal. Data from the demodulated payload portion of the received signal is stored in a computer-readable memory. 1. (canceled)2. A processor-implemented method comprising:receiving a signal that includes a preamble and a payload portion, the preamble being a single carrier signal, and the payload portion being a single carrier signal or a multiple carrier signal; the payload portion is a single carrier signal if a first cover sequence is included in the preamble, and', 'the payload portion is a multiple carrier signal if a second cover sequence is included in the preamble;, 'determining from the preamble whether the payload portion is a single carrier signal or a multiple carrier signal, wherein'}in response to the payload portion being a single carrier signal, demodulating the payload portion in a single carrier mode;in response to the payload portion being a multiple carrier signal, demodulating the payload portion in a multiple carrier mode; andstoring data from the demodulated payload portion in a computer-readable memory.3. The processor-implemented method of claim 2 , wherein determining from ...

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Номер записи: 32
13-06-2013 дата публикации

Circuit and method for removing frequency offset, and communication apparatus

Номер: US20130148762A1
Автор: Koutaro Mizuno
Принадлежит: Lapis Semiconductor Co Ltd

A circuit and a method for removing a frequency offset and a communication apparatus including the circuit, capable of removing the frequency offset by tracking rapidly and accurately in a payload section. A sequence of sample levels is obtained by sampling a frequency level of the baseband signal at every 0.5 symbol interval. Absolute values of differences between the frequency levels adjacent to each other at every 1 symbol are calculated as first difference absolute values. Absolute values of differences between the frequency levels adjacent to each other at every 1 symbol are calculated as second difference absolute values. When the first difference absolute values are greater than a predetermined first determination value or the second difference absolute values are less than a predetermined second determination value, the average value calculated is set as the frequency offset.

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Номер записи: 33
20-06-2013 дата публикации

Circuits and Methods for a Combined Phase Detector

Номер: US20130156076A1
Автор: Hsu Chunwei, Kinget Peter R., Tripurari Karthik, YU Shih-An
Принадлежит:

Circuits and methods for a combined phase detector are provided. In some embodiments, circuits for a combined phase detector are provided, the circuits comprising: a tri-state phase frequency detector and charge pump that receives a reference signal and a first input signal, and that produces a first output signal; and a sub-sampling phase detector that receives the reference signal and a second input signal, and that outputs a second output signal, wherein the first output signal and the second output signal are coupled together. 1. A circuit for a combined phase detector , comprising:a tri-state phase frequency detector and charge pump that receives a reference signal and a first input signal, and that produces a first output signal; anda sub-sampling phase detector that receives the reference signal and a second input signal, and that outputs a second output signal,wherein the first output signal and the second output signal are coupled together.2. The circuit of claim 1 , further comprising a loop filter coupled to the first output signal and to the second output signal.3. The circuit of claim 2 , further comprising a voltage controlled oscillator coupled to the loop filter.4. The circuit of claim 3 , wherein the second input signal is based on an output of the voltage controlled oscillator.5. The circuit of claim 1 , further comprising a divider that divides the second input signal to provide the first input signal.6. The circuit of claim 1 , wherein the tri-state phase frequency detector and charge pump and the sub-sampling phase detector are configured so that a maximum current of the second output signal is smaller than three times a charge pump current of the tri-state phase frequency detector and charge pump divided by the value of four times the ratio of the frequency of the second input signal and the frequency of the reference signal.7. A circuit for a combined phase detector claim 1 , comprising:means for providing a tri-state phase frequency detector ...

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Номер записи: 34
20-06-2013 дата публикации

SYMBOL ERROR DETECTION FOR BLUETOOTH BASIC DATA RATE PACKETS

Номер: US20130156132A1
Автор: Ozgur Soner
Принадлежит: QUALCOMM INCORPORATED

A symbol error detector can be configured to detect symbol errors of GFSK modulated portions of a Bluetooth packet without relying solely on a CRC error detection mechanism. The symbol error detector can operate on frequency error signals that are a difference between a frequency associated with a current symbol and predetermined frequency outputs from a bank of filters matched to a frequency response of the Bluetooth receiver for predefined combinations of three consecutive symbols (i.e., an estimated previously decoded symbol, an estimated current symbol, and an estimated subsequent symbol). The frequency error signals can be compared against a threshold and against each other to determine a potential unreliability in decoding the current symbol and to determine whether to generate a symbol error notification. The frequency error signals being within a threshold of each other can indicate potential unreliability in decoding the current symbol. 1. A method comprising:determining, at a receiver of a wireless network device, a frequency associated with a first symbol of a received signal;generating, at each of a plurality of filters matched to a frequency response of the receiver for a corresponding each of a plurality of predefined symbol combinations, a frequency output associated with each of the plurality of predefined symbol combinations;determining a frequency error, associated with each of the plurality of predefined symbol combinations, that indicates a difference between the frequency output associated with each of the plurality of predefined symbol combinations and the frequency associated with the first symbol of the received signal;determining that a first predefined symbol combination of the plurality of predefined symbol combinations is associated with a smallest frequency error of the frequency errors associated with the plurality of predefined symbol combinations; anddecoding the first symbol of the received signal based, at least in part, on the ...

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Номер записи: 35
27-06-2013 дата публикации

Control system methods and apparatus for inductive communication across an isolation barrier

Номер: US20130163688A1
Автор: James G. Calvin
Принадлежит: Invensys Systems Inc

Improved control apparatus and methods transfer information between devices, such as controllers and field devices, utilizing a modulator that generates a pulse width modulated (PWM) signal containing information to be transferred by a first of the devices, e.g., the controller, to the second device. A transformer or other inductive device transfers the PWM signal across the isolation barrier, where it is demodulated to analog form for application to the second device, e.g., the field device. Information transferred from the second device to the first device can be transferred in an amplitude modulated (AM) signal that utilizes, as its carrier, a fixed duty cycle output of the modulator that generates the PWM signal.

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Номер записи: 36
04-07-2013 дата публикации

Streamlined apparatus and methods for rfid communication

Номер: US20130169416A1
Автор: Afshin Rezayee
Принадлежит: Individual

Methods and devices for receiving a data signal transmitted via load modulation, by detecting current supplied in an amplifier feeding the antenna of the device which transmits the carrier signal.

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Номер записи: 37
04-07-2013 дата публикации

Interpolation of Filter Coefficients

Номер: US20130170582A1
Автор: Jens Rosendahl, Mika Salmi, Ville Ruuska
Принадлежит: St Ericsson SA

The frequency response of a digital filter, such as a pre-emphasis filter in a signal transmitter having a phase-locked loop, is adjusted using interpolation of the filter coefficients, enabling sets of filter coefficients to be pre-computed or generated as needed in the transmitter. The phase error behavior of the digital filter can be significantly improved.

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Номер записи: 38
18-07-2013 дата публикации

WIRELESS COMMUNICATION DEVICE AND CONTROL METHOD FOR WIRELESS COMMUNICATION DEVICE

Номер: US20130183918A1
Автор: KISHIGAMI Kazushige, MAEDA Mitsunori, MANPO Mitsuhiko, TAKAYAMA Naohito, TANII Takashi
Принадлежит: FUJITSU LIMITED

An antenna receives an RF signal and an RF signal at different frequency bands. An oscillator outputs a local oscillator signal at a frequency f. An oscillator outputs a local oscillator signal at a frequency f. A modulator modulates the frequency based on the local oscillator signal at the frequency f and the local oscillator signal at the frequency f, and generates a plurality of local oscillator signals at different frequencies. A frequency converter mixes the plurality of local oscillator signals, at different frequencies, generated by the modulator, with the RF signal and the RF signal, and generates baseband signals of the RF signal and the RF signal. A signal processor performs a predetermined process for the baseband signals generated by the frequency converter. 1. A wireless communication device comprising:a signal receiver that receives a plurality of signals at different frequencies;a first oscillator that outputs a first local oscillator signal;a second oscillator that outputs a second local oscillator signal at a frequency different from a frequency of the first local oscillator signal;a modulator that generates a plurality of oscillator signals at different frequencies by performing frequency modulation based on the first local oscillator signal and the second local oscillator signal;a frequency converter that mixes the plurality of local oscillator signals at the different frequencies with the plurality of signals received by the signal receiver; anda signal processor that performs a predetermined process for the signals which are generated by the mixing of the frequency converter.2. The wireless communication device according to claim 1 , wherein:the signal receiver receives two signals at different frequencies; andthe modulator generates two local oscillator signals at different frequencies.3. The wireless communication device according to claim 2 , whereinthe first local oscillator signal has an intermediate frequency between the two signals at the ...

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Номер записи: 39
25-07-2013 дата публикации

Frequency shift compensation, such as for use in a wireless meter reading environment

Номер: US20130188746A1
Автор: Barry Cahill-O'Brien, Mark K. Cornwall
Принадлежит: Itron Inc

Methods and apparatus for computing the carrier frequency of a transmitter using frequency modulated digital data to compensate for frequency shifting of the transmitter and the receiver local oscillators and for bandwidth adjustment of the receiver's filter. In particular, methods and apparatus are disclosed for binary systems transmitting “1” and “0” data using decoded or undecoded received signals.

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Номер записи: 40
08-08-2013 дата публикации

Co-channel communication methods, systems, & devices

Номер: US20130201898A1
Автор: Hassan Rafique, Zhi-Zhong Yu
Принадлежит: Qualcomm Inc

Co-channel communications methods, systems, and devices are provided. Embodiments can be utilized to allow multiple users on one time slot (MUROS). For example, a method for wireless communication by a first remote station can comprise receiving a first co-channel signal that has a first amplitude and a second co-channel signal that has a second amplitude, wherein a difference between the first amplitude and the second amplitude is less than a threshold; selecting one of the first co-channel signal and the second co-channel signal; and demodulating the selected co-channel signal. Other aspects, embodiments, and features are also claimed and described.

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Номер записи: 41
29-08-2013 дата публикации

Efficient control signaling over shared communication channels with wide dynamic range

Номер: US20130223320A1
Автор: Arthur Senyue Loh, Donald Wesley Becker, John Hai O'neill, Nirmalkumar Velayudhan, Veena Padmanabhan
Принадлежит: Viasat Inc

Embodiments provide methods, apparatuses, and systems for efficient control signaling over shared communication channels with wide dynamic range. Some embodiments includes a gateway configured to encode and to transmit multiple physical layer headers, including a first physical layer header and a second physical layer header. The first physical layer header may span a first length and represent a first modcode; the second physical layer header may span a second length and represent a second modcode. The second length may be longer than the first length. Embodiments may include multiple terminals in wireless communication with the gateway via satellite, including a first terminal configured to decode the first physical layer header and to determine the first modcode. Embodiments may include a second terminal configured to decode the second physical layer header and determine the second modcode.

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Номер записи: 42
10-10-2013 дата публикации

Systems and methods for transmitting pilot tones

Номер: US20130266086A1
Автор: Didier Johannes Richard Van Nee, Hemanth Sampath, Lin Yang, Sameer Vermani, Tao Tian
Принадлежит: Qualcomm Inc

Systems and methods for using travelling pilots for channel estimation are described herein. In one aspect, wireless communications apparatus is described that comprises a processor configured to divide a plurality of tones on which pilot signals are to be transmitted among a plurality of symbols, wherein each symbol includes less than all of the plurality of tones and the plurality of symbols includes at least a subset of the plurality of tones. The wireless communication apparatus further comprises a transmitter configured to transmit, during a given symbol, pilot signals on the tones included in the given symbol, wherein the tones over which the pilot signals are transmitted are changed from symbol to symbol.

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Номер записи: 43
17-10-2013 дата публикации

Wireless Device Transmission Power

Номер: US20130272231A1
Автор: Esmael Hejazi Dinan
Принадлежит: Individual

A wireless device transmits a first packet in subframe n of a first cell of a first cell group and transmits a second packet in subframe n+1 of a second cell of a second cell group overlapping in time with the transmission of the first packet. The wireless device reduces a subframe transmission power of at least one of the first packet and the second packet if a power parameter is more than an allowable transmission power. A calculation for the power parameter considers transmission power of the first packet and the second packet according to a pre-configured rule.

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Номер записи: 44
17-10-2013 дата публикации

Apparatus and method of transmitting hierarchically modulated signal

Номер: US20130272451A1
Автор: Hyoung Soo Lim, Tae Jin JUNG
Принадлежит: Electronics and Telecommunications Research Institute ETRI

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.

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Номер записи: 45
31-10-2013 дата публикации

Signal select in underground line location

Номер: US20130287125A1
Автор: George MAINESCU, Ion DRACEA, John Mark Royle, Razvan Gabriel STEFANOIU, Stephen John Petherick
Принадлежит: Vivax Metrotech

A transmitter and receiver for performing a signal select algorithm are provided. A transmitter for providing a signal on a line to be located includes at least one direct digital synthesizer, the direct digital synthesizer producing two component frequencies in response to an input square wave signal; and a feedback loop providing the input square wave.

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Номер записи: 46
07-11-2013 дата публикации

Method and apparatus for transmitting and receiving signals

Номер: US20130294220A1
Автор: Heung Mook Kim, Jong Soo Lim, Namho Hur, Sun Hyoung Kwon
Принадлежит: Electronics and Telecommunications Research Institute ETRI

A transmission apparatus couples a first phase modulation signal for first input data and a second phase modulation signal for second input data according to a first coupling method and transmits the coupled signal, and a reception apparatus receives the coupled signal. The reception apparatus derives a signal in which a first phase modulation signal and a second phase modulation signal are coupled according to a second coupling method from a received signal and separates the first phase modulation signal and the second phase modulation signal from the received signal based on the received signal and the derived signal. Furthermore, the reception apparatus obtains the first input data by demodulating the first phase modulation signal and obtains the second input data by demodulating the second phase modulation signal.

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Номер записи: 47
14-11-2013 дата публикации

FREQUENCY MODULATOR HAVING DIGITALLY-CONTROLLED OSCILLATOR ARRANGED FOR RECEIVING MODULATION TUNING WORD AND PHASE-LOCKED LOOP TUNING WORD AND/OR RECEIVING FRACTIONAL TUNING WORD OBTAINED THROUGH ASYNCHRONOUS SAMPLING AND INTEGER TUNING WORD

Номер: US20130301754A1
Автор: Staszewski Robert Bogdan, Wang Chi-Hsueh
Принадлежит:

A frequency modulator includes a digitally-controlled oscillator (DCO) arranged for producing a frequency deviation in response to a modulation tuning word and a phase-locked loop (PLL) tuning word. In addition, another frequency modulator includes a DCO and a DCO interface circuit. The DCO is arranged for producing a frequency deviation in response to an integer tuning word and a fractional tuning word. The DCO interface circuit is arranged for generating the integer tuning word and the fractional tuning word to the DCO, wherein the fractional tuning word is obtained through asynchronous sampling of a fixed-point tuning word. 1. A frequency modulator comprising:a digitally-controlled oscillator (DCO), arranged for producing a frequency deviation in response to a modulation tuning word and a phase-locked loop (PLL) tuning word.2. The frequency modulator of claim 1 , wherein at least one of said modulation tuning word and said PLL tuning word comprises an integer part and a fractional part claim 1 , and said fractional part is obtained through asynchronous sampling.3. The frequency modulator of claim 1 , wherein samples of said modulating tuning word and said PLL tuning word are asynchronous.4. The frequency modulator of claim 1 , wherein said modulating tuning word is distinct from said PLL tuning word at an interface of said DCO.5. The frequency modulator of claim 1 , wherein sampling rate of said modulating tuning word is different from sampling rate of said PLL tuning word.6. The frequency modulator of claim 5 , wherein ratio of said sampling rate of said modulating tuning word and said sampling rate of said PLL tuning word is not an integer.7. The frequency modulator of claim 1 , wherein sampling rate of said modulating tuning word is dependent on said frequency deviation.8. The frequency modulator of claim 7 , wherein sampling rate of said PLL tuning word is independent from said frequency deviation.9. The frequency modulator of claim 1 , wherein said DCO has a ...

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Номер записи: 48
12-12-2013 дата публикации

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

Номер: US20130329827A1
Автор: Kazuyuki Sakoda, Ryo Sawai, Shinichi Kuroda, Yuichi Morioka
Принадлежит: Sony Corp

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.

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Номер записи: 49
12-12-2013 дата публикации

Simultaneous transmission of clock and bidirectional data over a communication channel

Номер: US20130329828A1
Автор: Baegin Sung, Chandlee B. Harrell, Hanwoong SOHN, Inyeol Lee, Shinje TAHK, Sun Woo Baek
Принадлежит: Silicon Image Inc

Embodiments of the invention are generally directed to simultaneous transmission of clock and bidirectional data over a communication channel. An embodiment of a transmitting device includes a modulator to generate a modulated signal including a clock signal and a data signal, the clock signal being modulated by a first signal edge of the modulated signal and the data signal being modulated by a position of a second signal edge of the modulated signal; a driver to drive the modulated signal on a communication channel; an echo canceller to subtract reflected signals on the communication channel; and a data recovery module to recover a signal received on the communication channel, the received signal being encoded by Return-to-Zero (RZ) encoding, the signal being received simultaneously with driving the modulated signal on the communication channel.

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Номер записи: 50
19-12-2013 дата публикации

APPARATUS AND METHOD FOR PERFORMING PROPERRIZING FREQUENCY SHIFT(P-FRESH) VECTORIZING

Номер: US20130336425A1
Автор: Cho Joonho, Han Byungwook, Kim Byounghoon, Lee Daewon, YEO Jeongho
Принадлежит:

To achieve these and other advantages and in accordance with the purpose of the present invention, as embodied and broadly described herein, there is provided a method for performing properizing frequency shift (p-FRESH) vectorizing, the method comprising: converting a scalar-valued input signal of length L into a 2L-by-1 vector-valued output signal including complex conjugate signal of the input signal; modulating the input signal and the complex conjugate signal each with L different carriers; and bandpass filtering the modulated signal to form the output signal, wherein the output signal is band-limited to a half-Nyquist zone (F). 1. A method for performing properizing frequency shift (p-FRESH) vectorizing , the method comprising:converting a scalar-valued input signal of length L into a 2L-by-1 vector-valued output signal including complex conjugate signal of the input signal;modulating the input signal and the complex conjugate signal each with L different carriers; andbandpass filtering the modulated signal to form the output signal.2. The method of claim 1 , wherein the output signal is band-limited to a half-Nyquist zone (F).5. The method of claim 3 , wherein the input signal has zero-mean claim 3 , and the output signal is proper-complex zero-mean vector-WSS process when the reference rate has integer values of the cycle period of the input signal.6. The method of claim 3 , wherein the output signal is jointly WSS claim 3 , and an auto-correlation function of the output signal has second-order property of the input signal.9. The apparatus of claim 7 , wherein the input signal has zero-mean claim 7 , and the output signal is proper-complex zero-mean vector-WSS process when the reference rate has integer values of the cycle period of the input signal.10. The apparatus of claim 7 , wherein the output signal is jointly WSS claim 7 , and an auto-correlation function of the output signal has second-order property of the input signal. The present disclosure ...

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Номер записи: 51
09-01-2014 дата публикации

METHOD AND APPARATUS FOR IMPLEMENTING SPACE FREQUENCY BLOCK CODING IN AN ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING WIRELESS COMMUNICATION SYSTEM

Номер: US20140010323A1
Автор: Bultan Aykut, Huang Yuejin, Koo Chang-Soo, Kwak Jaeyoung, Olesen Robert Lind, Ozluturk Fatih, Pasad Kalpendu R., Zeira Elad
Принадлежит: INTERDIGITAL TECHNOLOGY CORPORATION

The present invention is related to a method and apparatus for implementing space frequency block coding (SFBC) in an orthogonal frequency division multiplexing (OFDM) wireless communication system. The present invention is applicable to both a closed loop mode and an open loop mode. In the closed loop mode, power loading and eigen-beamforming are performed based on channel state information (CSI). A channel coded data stream is multiplexed into two or more data streams. Power loading is performed based on the CSI on each of the multiplexed data streams. SFBC encoding is performed on the data streams for each of the paired subcarriers. Then, eigen-beamforming is performed based on the CSI to distribute eigenbeams to multiple transmit antennas. The power loading may be performed on two or more SFBC encoding blocks or on each eigenmodes. Additionally, the power loading may be performed across subcarriers or subcarrier groups for weak eigenmodes. 1. A base station comprising:circuitry configured to receive information including at least one channel quality indicator and at least one indication of a precoding matrix from a wireless transmit/receive unit (WTRU); wherein each channel quality indicator indicates modulation and coding information;wherein the circuitry is further configured based on the received information to process first data using a first modulation and coding and to process second data using a second modulation and coding; andwherein the circuitry is further configured to substantially simultaneously transmit the first data and the second data using OFDM spatial multiplexing over a plurality of antennas to the WTRU.2. The base station of wherein the first modulation and coding and the second modulation and coding are different.3. The base station of wherein the received information includes a plurality of channel quality indicators; wherein each of the plurality of channel quality indicators corresponds to a group of subcarriers.4. The base station of ...

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Номер записи: 52
16-01-2014 дата публикации

LOW PHASE-NOISE INDIRECT FREQUENCY SYNTHESIZER

Номер: US20140016727A1
Автор: Simon Herve
Принадлежит: THALES

A low phase noise frequency synthesizer, comprising, arranged in series, a first mixer receiving a reference signal at a reference frequency F, a loop filter and a voltage-controlled oscillator delivering a microwave signal at a second frequency Fslaved to a multiple of reference frequency F, further comprises: means of multiplication of the frequency Fof said microwave signal by a factor N strictly greater than 1, means of correction of the frequency N.Fof the output signal of the multiplication means configured to restore frequency N.Fto an interval [F, F] where output frequency Fwould vary if multiplication factor N=1, means of division of the frequency Fof the output signal of the correction means by a factor equal to the expected ratio between frequency Fand reference frequency F, the frequency division means being connected at output to the second input of the first mixer. 1. A frequency synthesizer with low phase noise , containing , arranged in series , a first mixer receiving at its first input a reference signal at a reference frequency F , a loop filter and a voltage-controlled oscillator delivering at output a microwave signal at a second frequency Fslaved to a multiple of said reference frequency F , characterized in that it also comprises the frequency synthesizer further comprising:{'sub': 'O', 'means of multiplication of the frequency Fof said microwave signal by a factor N strictly greater than 1,'}{'sub': O', 'O', 'Omin', 'Omax', 'O, 'means of correction of the frequency N.Fof the output signal of said multiplication means configured to restore this frequency N.Fto an interval [F, F] in which said output frequency Fwould vary if said multiplication factor N was equal to 1,'}{'sub': j', 'j', 'r, 'means of division of the frequency Fof the output signal of said correction means by a factor equal to the expected ratio between said frequency Fand the reference frequency F,'}said frequency division means being connected at output to the second input of ...

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Номер записи: 53
16-01-2014 дата публикации

Physical broadcast channel (pbch) transmission for reliable detection of antenna configuration

Номер: US20140018012A1
Автор: Farooq Khan, Jianzhong Zhang, Joonyoung Cho, Juho Lee, Zhouyue Pi
Принадлежит: SAMSUNG ELECTRONICS CO LTD

Reliable detection of the configuration of transmit antennas includes obtaining a data for transmission, encoding the data, and modulating the data. During the modulating of the data, the data may be configured in such a way as to convey the configuration of the antennas through the modulation of the data. An antenna configuration is obtained by obtaining a representation of the antenna configuration, and masking the data with an error correcting code, where the mask corresponds to the antenna configuration.

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Номер записи: 54
23-01-2014 дата публикации

RECEIVING APPARATUS AND METHOD IN SMART UTILITY NETWORK COMMUNICATION SYSTEM

Номер: US20140023164A1
Автор: CHOI Sangsung, KIM Byoung Hak, KIM Jaehwan, OH Mi Kyung, SHIN cheol-ho
Принадлежит: Electronics and Telecommunications Research Institute

A receiving apparatus receives an FSK signal, converts the FSK signal into a phasor including amplitude and phase, estimates and compensates for a CFO (carrier frequency offset) from the converted phasor, and recovers a data bit from the converted phasor. 1. A method of receiving signals by an FSK (frequency shift keying) receiver , the method comprising:receiving an FSK signal;converting the FSK signal into a phasor including amplitude and phase; andrecovering a data bit from the phasor.2. The method of claim 1 , further comprising receiving an FSK signal claim 1 , converting the FSK signal into a phasor claim 1 , and recovering a data bit from the phasor.3. The method of claim 2 , further comprising claim 2 , prior to the recovering claim 2 , compensating for a CFO (carrier frequency offset).4. The method of claim 3 , wherein the predetermined parts comprise a preamble part.5. The method of claim 3 , wherein the predetermined parts comprise an SFD (start of frame delimiter) part.6. The method of claim 1 , whereinthe FSK signal comprises a preamble part and a payload part, andat least one of the preamble and payload parts comprises a silence part.7. The method of claim 6 , wherein the recovering comprises eliminating an interference signal from the FSK signal by using a phasor converted from the silence part.8. The method of claim 6 , wherein the silence part of the preamble part is inserted after a preamble signal.9. The method of claim 6 , wherein the silence part of the payload part is inserted at regular intervals.10. The method of claim 1 , wherein the converting comprises calculating the phasor by multiplying the FSK signal by a complex conjugate of the FSK signal obtained by delaying the FSK signal by a predetermined phase difference.11. The method of claim 1 , wherein the converting comprises calculating the phasor based on a difference between the FSK signal and a signal obtained by delaying the FSK signal by a phase difference.12. The method of claim 1 , ...

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Номер записи: 55
30-01-2014 дата публикации

Low-if transceiver architecture

Номер: US20140029682A1
Автор: Gareth Pryce Weale, Mohammad-Reza Nezhad-Ahmadi
Принадлежит: Semiconductor Components Industries LLC

A transceiver, receiver, and transmitter are provided. The transceiver may also include a programmable matching block configured to implement impedance-matching between an antenna and the receiver and/or between the antenna and the transmitter. The programmable matching block may implement the impedance-matching through a shared matching circuit block. The programmable matching block may include at least one of a programmable inductor and a programmable capacitor.

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Номер записи: 56
30-01-2014 дата публикации

LOCAL OSCILLATION GENERATOR AND ASSOCIATED COMMUNICATION SYSTEM AND METHOD FOR LOCAL OSCILLATION GENERATION

Номер: US20140029690A1
Автор: Chang Keng-Meng, Wang Yao-Chi
Принадлежит:

A local oscillation generator includes an oscillation circuit, a frequency multiplication circuit, a mixer, and a frequency divider. The oscillation circuit provides a fundamental oscillation signal. The frequency multiplication circuit provides a first oscillation signal according to the fundamental oscillation signal. The mixer provides a mixed oscillation signal according to mixing of the fundamental oscillation signal and the first oscillation signal. The frequency divider frequency divides the mixed oscillation signal so that the local oscillation generator accordingly provides a local oscillation signal. 1. A local oscillation generator , applied to a communication system , for providing a local oscillation signal , the local oscillation generator comprising:an oscillation circuit, configured to provide a fundamental oscillation signal associated with a fundamental frequency;a frequency multiplication circuit, coupled to the oscillation circuit, for providing a first oscillation signal according to the fundamental oscillation signal;a mixer, coupled to the oscillation circuit and the frequency multiplication circuit, for providing a mixed oscillation signal according to the fundamental oscillation signal and the first oscillation signal; anda frequency divider, coupled to the mixer, for frequency dividing the mixed oscillation signal to provide a frequency divided signal.2. The local oscillation generator according to claim 1 , wherein the frequency divided signal is associated with the local oscillation signal claim 1 , and the fundamental frequency is a non-integral multiple of a frequency of the local oscillation signal.3. The local oscillation generator according to claim 2 , wherein the oscillation circuit and the frequency multiplication circuit are integrated in an oscillator claim 2 , the fundamental oscillation signal is provided by differential nodes of the oscillator claim 2 , and the first oscillation signal is provided by a common mode node of the ...

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Номер записи: 57
30-01-2014 дата публикации

RECEIVER CIRCUIT AND FILTERING METHOD USED THEREIN

Номер: US20140029707A1
Автор: Kitsunezuka Masaki
Принадлежит: NEC Corporation

A receiver circuit includes a first mixer that performs frequency conversion on a first signal of containing a first frequency entered from outside to output the resulting frequency-converted first signal, and a first selector that selects one out of an output signal of the first mixer and a second signal containing a second frequency entered from outside. A filter removes a pre-set frequency band of the signal selected by the first selector, and a second selector that selects between outputting the signal removed of the frequency band to outside and outputting the signal to a subsequent side circuit. A second mixer performs frequency conversion of the signal output from the second selector to output the resulting frequency-converted signal. The second mixer is the subsequent side circuit. The second frequency has a carrier frequency of a radio signal. 116.-. (canceled)17. A receiver circuit , comprising:a first mixer that performs frequency conversion on a first signal containing a first frequency, entered from outside, to output a resulting frequency-converted first signal;a first selector that selects one out of the signal output from the first mixer and a second signal containing a second frequency, entered from outside;a filter that removes a pre-set frequency band of the signal selected by the first selector;a second selector that selects between outputting the signal removed of the frequency band to outside and outputting the signal concerned to a subsequent side circuit; anda second mixer that performs frequency conversion on the signal selected by the second selector to output the resulting frequency-converted signal; the second mixer being the subsequent side circuit;wherein the second frequency is equal to a carrier frequency of a radio signal.18. The receiver circuit according to claim 17 , wherein claim 17 , the filter operates as an input side and as an output side claim 17 , respectively claim 17 , for the first selector and the second selector.19. ...

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Номер записи: 58
13-03-2014 дата публикации

TRANSMITTER

Номер: US20140072077A1
Автор: CHENG San Jeow, Gao Yuan, HENG Chun Huat
Принадлежит:

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, ...

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Номер записи: 59
13-03-2014 дата публикации

DATA PROCESSING APPARATUS AND METHOD FOR USE IN AN INTERLEAVER SUITABLE FOR MULTIPLE OPERATING MODES

Номер: US20140072081A1
Автор: Atungsiri Samuel Asanbeng, Taylor Matthew Paul Athol, Wilson John Nicholas
Принадлежит: SONY CORPORATION

A data processing apparatus maps input symbols to be communicated onto a predetermined number of sub-carrier signals of an Orthogonal Frequency Division Multiplexed (OFDM) symbol. The data processor includes an interleaver memory which reads-in the predetermined number of data symbols for mapping onto the OFDM sub-carrier signals. The interleaver memory reads-out the data symbols on to the OFDM sub-carriers to effect the mapping, the read-out being in a different order than the read-in, the order being determined from a set of addresses, with the effect that the data symbols are interleaved on to the sub-carrier signals. The set of addresses are generated from an address generator which comprises a linear feedback shift register and a permutation circuit. 1. (canceled)2. A receiver for receiving symbols by mapping the symbols received from a predetermined number of sub-carrier signals of an Orthogonal Frequency Division Multiplexed (OFDM) symbol into an output symbol stream , the data processing apparatus comprising:a de-interleaver configured to read-into a memory the predetermined number of data symbols from the OFDM sub-carrier signals, the predetermined number of OFDM sub-carriers symbols being dependent on an OFDM operating mode and to read-out of the memory the data symbols into the output symbol stream to effect the mapping, the read-out being in a different order than the read-in, the order being determined from a set of addresses, with the effect that the data symbols are de-interleaved from the OFDM sub-carrier signals,an address generator configured to generate the set of addresses, the addresses being generated for the received data symbols to indicate the OFDM sub-carrier signals from which the received data symbols are to be mapped into the output symbol stream, the address generator comprisinga linear feedback shift register including a predetermined number of register stages and being configured to generate a pseudo-random bit sequence in accordance ...

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Номер записи: 60
27-03-2014 дата публикации

SYSTEM AND METHOD FOR DUAL CHIRP MODULATION

Номер: US20140086280A1
Автор: HUANG Ruei-Ran
Принадлежит: PRINCETON TECHNOLOGY CORPORATION

A system for dual chirp modulation includes a transmission unit, a receiving unit, and a transmission channel. A modulation module of the transmission unit is configured to receive binary data and modulate the binary data by a first dual chirp sequence and a second dual chirp sequence for generating an output signal. Then the output signal is converted from digital form to analog form by a digital to analog converter. A transmission channel is configured to receive the output signal converted to analog form, wherein the output signal converted to analog folio passes the transmission channel for generating a received signal. An analog to digital converter converts the received signal from analog form to digital form and a demodulation module demodulates the received signal with digital form, by the first dual chirp sequence and the second dial chirp sequence, for recovering the binary data. 1. A dual chirp modulation system , comprising: a modulation module, configured to receive binary data and modulate the binary data by a first chirp sequence and a second chirp sequence for generating an output signal; and', 'a digital to analog converter, converting the output signal from digital form to analog form;, 'a transmission unit, comprisinga transmission channel, receiving the output signal converted to analog form, wherein the output signal converted to analog form passes the transmission channel to generate a receipt signal; and an analog to digital converter, configured to convert the received signal from analog form to digital form; and', 'a demodulation module, configured to demodulate the receipt signal, which is converted to digital form, by the first chirp sequence and the second chirp sequence, for recovering the binary data., 'a receiving unit, comprising2. The system of claim 1 , wherein the first chirp sequence is indicative that the binary data is 0 and a second chirp sequence is indicative that the binary data is 1.3. The system of claim 1 , wherein the ...

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Номер записи: 61
01-01-2015 дата публикации

COMMUNICATION METHODS BETWEEN A TANKER AIRCRAFT AND A RECEIVER AIRCRAFT IN AN IN-FLIGHT REFUELING OPERATION

Номер: US20150003556A1
Автор: FERNANDEZ GARCíA Javier, GIMÉNEZ ABAD Luis Fernando
Принадлежит:

The invention provides transmission methods of messages between a tanker aircraft and receiver aircraft that facilitate air refueling operations using a boom device in, particularly, radio silence environments. In the case of data messages, the method comprises steps for transmitting a message from the aircraft that emits the message to the target aircraft as an analog signal via the electro-magnetic connection which is used for contact detection and disconnection and audio communications between the tanker aircraft and the receiver aircraft in radio silence environments. In the case of audio and data messages it is transmitted a signal resulting from mixing analog signals corresponding to both messages in a way that allows their separation at the target aircraft. 1111315111913151917181113. Method of transmitting a message between a tanker aircraft () and a receiver aircraft () during an in-flight refueling operation performed by means of a boom device () deployable from the tanker aircraft () and connectable to a receptacle () of the receiver aircraft () , the boom device () and the receptacle () comprising coils ( , ) which allow establishing an electro-magnetic connection between the two aircraft ( , ) when they are connected for performing a refueling operation , characterized in that the message is a data message and in that the method comprises the following steps:{'b': 24', '94', '29', '99, 'a) providing in the aircraft that emits the message a digital data frame (, ) containing the data message and a control signal (, ) for its sending;'}{'b': 24', '94', '25', '95', '26', '96, 'b) converting in the aircraft that emits the message the digital data frame (, ) into a digital data signal (, ) and transforming this signal into an analog data signal (, ) conditioned to a suitable voltage level for its transmission to the target aircraft of the message;'}c) transmitting the signal obtained in the previous step to the target aircraft via said electro-magnetic ...

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Номер записи: 62
01-01-2015 дата публикации

CIRCUIT AND METHOD FOR REMOVING FREQUENCY OFFSET, AND COMMUNICATION APPARATUS

Номер: US20150003568A1
Автор: MIZUNO Koutaro
Принадлежит: LAPIS SEMICONDUCTOR CO., LTD

A circuit and a method for removing a frequency offset and a communication apparatus including the circuit, capable of removing the frequency offset by tracking rapidly and accurately in a payload section. A sequence of sample levels is obtained by sampling a frequency level of the baseband signal at every 0.5 symbol interval. Absolute values of differences between the frequency levels adjacent to each other at every 1 symbol are calculated as first difference absolute values. Absolute values of differences between the frequency levels adjacent to each other at every 1 symbol are calculated as second difference absolute values. When the first difference absolute values are greater than a predetermined first determination value or the second difference absolute values are less than a predetermined second determination value, the average value calculated is set as the frequency offset. 1. A circuit for removing a frequency offset of a baseband signal , the circuit comprising:a sampling circuit which samples a frequency level of the baseband signal at every first interval to obtain a sequence of sample levels;a first difference absolute value calculating part which calculates first absolute values of differences between the frequency levels adjacent to each other at every second interval having two times length of the first interval based on an arbitrary first frequency level of the sample levels as a plurality of first difference absolute values;a second difference absolute value calculating part which calculates second absolute values of differences between the frequency levels adjacent to each other at every interval of the second interval based on a second frequency level of the sample levels after the first interval from the first frequency level as a plurality of second difference absolute values;an average calculating part which calculates an average value based on the sequence of the sample levels; anda frequency offset holding part which includes a non- ...

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Номер записи: 63
03-01-2019 дата публикации

RANGING APPARATUS AND METHOD

Номер: US20190004155A1
Автор: Casamassima Filippo, Eber Wolfgang, Spiess Bernhard
Принадлежит:

The disclosure relates to a range-classifying-module for a radio receiver, the range-classifying-module configured to: receive a signal representative of a chirp from a transmitter, determine the presence of one or more pulses in the received signal; and classify the receiver as either proximal to or distal from the transmitter based on: one or more characteristics of the one or more pulses; in addition to a time-of-arrival of the one or more pulses. 1. A range-classifying-module for a radio receiver , the range-classifying-module configured to:receive a signal representative of a chirp from a transmitter;determine the presence of one or more pulses in the received signal; and 'one or more characteristics of the one or more pulses; in addition to a time-of-arrival of the one or more pulses.', 'classify the receiver as either proximal to or distal from the transmitter based on2. The range-classifying-module of claim 1 , wherein the one or more characteristics of the one or more pulses are dependent on a channel characteristic of a channel between the transmitter and the receiver.1. The range-classifying-module of claim 1 , wherein the one or more characteristics of the one or more pulses are independent of a time-of-arrival of the one or more pulses.2. The range-classifying-module of claim 1 , wherein the receiver is classified as either proximal to or distal from the transmitter based on the one or more characteristics being indicative of the transmitter being either inside or outside of a vehicle.5. The range-classifying-module of claim 1 , wherein the one or more characteristics comprise a separation between pulses in at least a portion of the signal.6. The range-classifying-module of claim 1 , wherein the one or more characteristics comprise an energy claim 1 , intensity or amplitude of at least a portion of the signal.7. The range-classifying-module of claim 1 , wherein the one or more characteristics comprise the number of pulses in at least a portion of the ...

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Номер записи: 64
13-01-2022 дата публикации

PHASE PREDICTION DEMODULATOR CIRCUITS AND RELATED METHOD

Номер: US20220014403A1
Автор: Snedeker Michael Douglas, Yoshioka Masahiro
Принадлежит:

An example apparatus includes: an input adapted to receive a signal modulated with data, counter circuitry coupled to the input and operable to determine a first count value in response to a first period between a first rising edge of the signal and a second rising edge of the signal, the first rising edge indicative of a start bit of the data, and determine a second count value based on a second period between a first falling edge of the signal and a second falling edge of the signal, data capture clock circuitry coupled to the counter circuitry and operable to generate a data capture clock based on the first count value in response to the second count value satisfying a threshold, and demodulator circuitry coupled to the counter circuitry and the data capture clock circuitry, the demodulator circuitry operable to generate a demodulated signal based on the data capture clock. 1. An apparatus comprising:an input adapted to receive a signal modulated with data; determine a first count value in response to a first period between a first rising edge of the signal and a second rising edge of the signal, the first rising edge indicative of a start bit of the data; and', 'determine a second count value based on a second period between a first falling edge of the signal and a second falling edge of the signal;, 'counter circuitry coupled to the input and operable todata capture clock circuitry coupled to the counter circuitry and operable to generate a data capture clock based on the first count value in response to the second count value satisfying a threshold; anddemodulator circuitry coupled to the counter circuitry and the data capture clock circuitry, the demodulator circuitry operable to generate a demodulated signal based on the data capture clock.2. The apparatus of claim 1 , wherein the data capture clock circuitry is to generate the data capture clock based on an adjustment of a phase of the data capture clock from a first phase to a second phase claim 1 , the ...

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Номер записи: 65
05-01-2017 дата публикации

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

Номер: US20170005752A1
Автор: Akihiko Matsuoka, Katsuaki Abe, Masayuki Orihashi, Yutaka Murakami
Принадлежит: Panasonic Intellectual Property Corp of America

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.

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Номер записи: 66
07-01-2016 дата публикации

MOBILE COMMUNICATIONS SYSTEM

Номер: US20160006588A1
Автор: Nodar Paul, Stephens Peter
Принадлежит: SEPURA PLC

A modulation scheme for use in a digital mobile radio communications system. The modulation scheme uses a four slot time-division multiple access scheme with 12.5 kHz channels. Each 12.5 kHz channel contains plural sub-carriers and each sub-carrier is modulated with a modulation scheme that encodes at least 4 bits per symbol. The modulation scheme can be used in a standalone mobile radio communications system, or in a hybrid mobile radio communications system that also uses standard TETRA modulation schemes. 1. A method of operating a digital mobile radio communications system , comprising:using a four slot time-division multiple access scheme in 12.5 kHz channels, with each 12.5 kHz channel containing plural sub-carriers and each sub-carrier being modulated with a modulation scheme that encodes at least 4 bits per symbol, for transmissions in the system.2. (canceled)3. The method of claim 1 , further comprising:using the TETRA π/4 DQPSK modulation scheme for transmissions in the system; anddynamically switching between the 12.5 kHz four slot time-division multiple access scheme and the TETRA π/4 DQPSK modulation scheme for transmissions in the system.4. (canceled)5. The method of claim 3 , further comprising:using the 12.5 kHz four slot time-division multiple access scheme for receiving transmissions and using the TETRA π/4 DQPSK modulation scheme for sending transmissions in the system; orusing the 12.5 kHz four slot time-division multiple access scheme for sending transmissions and using the TETRA π/4 DQPSK modulation scheme for receiving transmissions in the system.6. (canceled)7. (canceled)8. The method of claim 1 , further comprising using four sub-carriers and 34 symbols per sub-carrier in each 12.5 kHz channel.9. The method of claim 1 , wherein the modulation scheme encodes 4 bits per symbol.10. (canceled)11. (canceled)12. The method of claim 1 , further comprising:using a fixed constant modulation level for the 12.5 kHz four slot time-division multiple ...

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Номер записи: 67
04-01-2018 дата публикации

Group addressed transmission techniques for directional wireless networks

Номер: US20180006753A1
Автор: Carlos Cordeiro, Solomon Trainin
Принадлежит: Intel Corp

Group-addressed transmission techniques for directional wireless networks are described. In one embodiment, for example, an apparatus may comprise logic to generate a frame sequence for transmission to an addressee group of a group-addressed fragmented medium access control service data unit (MSDU), the frame sequence to comprise a source identification frame followed by a series of fragment frames comprising fragments of the group-addressed fragmented MSDU, the logic to encapsulate the frame sequence in packets of a first packet sequence for transmission in a first direction and encapsulate the frame sequence in packets of a second packet sequence for transmission in a second direction, the transmission of the second packet sequence in the second direction to be initiated following completion of the transmission of the first packet sequence in the first direction. Other embodiments are described and claimed.

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Номер записи: 68
04-01-2018 дата публикации

Short PUCCH in Uplink sPUCCH

Номер: US20180006769A1
Автор: Andersson Mattias, Määttänen Helka-Liina, Parkvall Stefan, Synnergren Per, Wager Stefan, Zhang Hanzhi
Принадлежит:

In one aspect, a wireless device receives a first data transmission from a base station in a first subframe interval and transmits HARQ feedback and/or CSI to the base station in a subsequent subframe interval, within a duration that is less than a maximum transmission duration that is possible within the subsequent subframe interval. In another aspect, a base station transmits a first data transmission to a wireless device in a first subframe interval and receives HARQ feedback and/or CSI from the wireless device in a subsequent subframe interval, within a duration that is less than a maximum transmission duration that is possible within the subsequent subframe interval. 141-. (canceled)42. A method , in a first wireless device , the method comprising:receiving a first data transmission from a second wireless device in a first subframe interval, wherein the first data transmission is received within a duration that is less than a maximum data transmission duration that is possible within the first subframe interval; andtransmitting hybrid automatic repeat request (HARQ) feedback and/or channel state information (CSI) to the second wireless device in a subsequent subframe interval that consists of a plurality of transmission symbols, wherein the transmission of the HARQ feedback and/or CSI occupies either exactly one of two slots in the subsequent subframe interval or fewer than all the transmission symbols in the one of the two slots.43. The method of claim 42 , wherein each slot consists of 7 Orthogonal Frequency-Division Multiplexing (OFDM) symbols and/or has a duration of 0.5 milliseconds.44. The method of claim 42 , wherein transmitting the HARQ feedback and/or CSI comprises:converting one or two bits of HARQ data to a complex-valued number;spreading the complex-valued number over twelve subcarriers using a cyclically-shifted length-12 sequence, to form an array of twelve complex numbers;spreading the array of twelve complex numbers to four single carrier ...

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Номер записи: 69
04-01-2018 дата публикации

Frequency Modulation Receiver and Frequency Modulation Receiving Method

Номер: US20180006800A1
Автор: Kuan-Chou LEE, Tai-Lai Tung, Yu-Che Su
Принадлежит: MStar Semiconductor Inc Taiwan

A frequency modulation receiver includes a frequency modulation demodulation circuit that generates a first signal, and a phase locked loop (PLL) circuit coupled to the frequency modulation demodulation circuit to receive the first signal. The PLL circuit includes: a voltage-controlled oscillator (VCO), generating an oscillation output signal according to a filtered output signal; a phase detector, coupled to the VCO, generating a phase signal according to the oscillation output signal and the first signal; and a proportional-integral-derivative (PID) filter, coupled to the VCO and the phase detector, receiving the phase signal and generating the filtered output signal to the VCO.

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Номер записи: 70
04-01-2018 дата публикации

Drift Robust Non-Coherent Demodulation Scheme

Номер: US20180006853A1
Автор: Avner Yuval
Принадлежит:

This document describes techniques for performing non-coherent demodulation of a differentially modulated signal in a drift robust manner. A differentially modulated signal, including a plurality of symbols, may be received. Non-coherent demodulation of the differentially modulated signal may be performed. The non-coherent demodulation may include performing noise prediction using a high-pass filtered estimated error signal associated with the differentially modulated signal. In some embodiments, frequency offset estimation to reduce frequency offset of the differentially modulated signal may also be performed as part of the non-coherent demodulation. 1. A wireless device , comprising:an antenna;a radio operatively coupled to the antenna; anda processing element operatively coupled to the radio; wirelessly receive a differentially modulated signal comprising a plurality of symbols; and', 'demodulate the differentially modulated signal,, 'wherein the wireless device is configured towherein the wireless device comprises a noise prediction loop configured to reduce noise characteristics of the differentially modulated signal, wherein the noise prediction loop performs noise prediction for a next symbol of the differentially modulated signal based at least in part on a high-pass filtered error signal associated with a current symbol of the differentially modulated signal and modifies the next symbol based at least in part on a result of the noise prediction, wherein the noise prediction is based at least in part upon a difference between an ideal angular domain result and an angular domain result of subtraction of a previous symbol from the current symbol.2. The wireless device of claim 1 ,wherein the wireless device further comprises a frequency offset estimation loop configured to reduce a constant frequency offset and/or a frequency offset drift of the differentially modulated signal.3. The wireless device of claim 2 ,wherein the frequency offset estimation loop ...

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Номер записи: 71
04-01-2018 дата публикации

LONG RANGE BLUETOOTH LOW ENERGY SYNCHRONIZATION SYSTEM

Номер: US20180006854A1
Автор: Zhang Yuwei
Принадлежит:

A synchronizer can include a symbol estimator, an inner-pattern de-mapper, a timing tracker, and a correlator. The symbol estimator can be configured to estimate one or more symbols of a received signal based on a phase signal. The inner-pattern de-mapper can be configured to de-map the one or more symbols to generate an inner-pattern de-mapped symbol estimation. The timing tracker can be configured to accumulate the inner-pattern de-mapped symbol estimation and to determine a peak position based on the accumulated inner-pattern de-mapped symbol estimation. The correlator can be configured to correlate the accumulated inner-pattern de-mapped symbol estimation based on a reference signal. The correlation of the accumulated inner-pattern de-mapped symbol estimation can be independent of a signal over sampling rate (OSR). The synchronizer can be adapted in a long range Bluetooth low energy (BLE) receiver. 1. A synchronizer adapted in a receiver , the synchronizer comprising:a symbol estimator configured to accumulate values of a phase signal based on an over sampling rate (OSR) to estimate one or more symbols of a received signal;an inner-pattern de-mapper configured to de-map the estimated one or more symbols to accumulate OSR samples of the estimated one or more symbols to generate inner-pattern de-mapped symbol estimations;a timing tracker configured to accumulate the inner-pattern de-mapped symbol estimations and to determine a peak position based on the accumulated inner-pattern de-mapped symbol estimations; and select an accumulated inner-pattern de-mapped symbol estimation from the accumulated inner-pattern de-mapped symbol estimations based on the peak position; and', 'correlate the selected accumulated inner-pattern de-mapped symbol estimation with a reference signal., 'a correlator configured to2. The synchronizer of claim 1 , wherein the correlation of the selected accumulated inner-pattern de-mapped symbol estimation is independent of the OSR.3. The ...

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Номер записи: 72
07-01-2021 дата публикации

METHOD OF TRANSMITTING SECURITY INFORMATION OF SINGLE-BIT ADC WIRETAP CHANNEL

Номер: US20210006601A1
Автор: LEE Jemin, Lee Si-Hyeon, Nam Seunghyun
Принадлежит:

Provided is a method of transmitting security information of a single-bit analog-to-digital converter (ADC) wiretap channel. In the method of transmitting the security information of the single-bit ADC channel, a transmitting terminal adds additive noise to a transmission signal and transmits the transmission signal, and a receiving terminal and a wiretap terminal which each include a single-bit ADC receive the transmission signal, wherein received information is processed so as not to be determined by the wiretap terminal. When intensity of additive noise of the receiving terminal is less than that of additive noise of the wiretap terminal, a binary phase-shift keying (BPSK) distribution is used, and when the intensity of the additive noise of the receiving terminal is greater than that of the additive noise of the wiretap terminal, a codebook is designed using an asymmetric BPSK distribution in which both of two message points have a positive value. 1. A method of transmitting security information of a single-bit analog-to-digital converter (ADC) channel , in which a transmitting terminal adds additive noise to a transmission signal and transmits the transmission signal and a receiving terminal and a wiretap terminal which each include a single-bit ADC receive the transmission signal , wherein received information is processed so as not to be determined by the wiretap terminal ,when intensity of additive noise of the receiving terminal is less than that of additive noise of the wiretap terminal, a binary phase-shift keying (BPSK) distribution is used, andwhen the intensity of the additive noise of the receiving terminal is greater than that of the additive noise of the wiretap terminal, a codebook is designed using an asymmetric BPSK distribution in which both of two message points have a positive value.4. The method of claim 3 , wherein in order to maximize a difference between amounts of pieces of information of the receiving terminal and the wiretap terminal ...

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Номер записи: 73
03-01-2019 дата публикации

INTERLEAVING AND MAPPING METHOD AND DEINTERLEAVING AND DEMAPPING METHOD FOR LDPC CODEWORD

Номер: US20190007066A1
Автор: Guan Yunfeng, Guo Xufeng, He Dazhi, Shi Yijun, Xu Yin, ZHANG Wenjun
Принадлежит:

An interleaving and mapping method and a deinterleaving and demapping method for an LDPC codeword are provided. The interleaving and mapping method comprises: performing first bit interleaving on a parity bits part of the LDPC codeword to obtain interleaved parity bits; splicing an information bit part of the codeword and the interleaved parity bits into a codeword after the first bit interleaving; dividing the codeword after the first bit interleaving into multiple consecutive bit subblocks in a predetermined length, and changing the order of the bit subblocks according to a corresponding permutation order (bit-swapping pattern) to form a codeword after second bit interleaving; dividing the codeword after the second bit interleaving into two parts, and writing the two parts into storage space in a column order respectively and reading the two parts from the storage space in a row order respectively to obtain a codeword after third bit interleaving. 1. A transmitter , comprising:an interleaver performing a first bit interleaving on parity bits in an LDPC codeword to obtain interleaved parity bits, wherein the parity bits contain a first parity bits part and a second parity bits part, and the first bit interleaving is performed on the first parity bits part and the second parity bits part respectively;the interleaver splicing the information bits part in the LDPC codeword and the interleaved parity bits into an LDPC codeword having undergone the first bit interleaving;the interleaver dividing the LDPC codeword having undergone the first bit interleaving into multiple consecutive bit subblocks in a predetermined length, and changing the order of the bit subblocks according to a corresponding bit interleaving pattern to form an LDPC codeword having undergone second bit interleaving; andthe interleaver dividing the LDPC codeword having undergone the second bit interleaving into two parts, writing the first part into a storage space in order and reading the first part ...

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Номер записи: 74
03-01-2019 дата публикации

INTERLEAVING AND MAPPING METHOD AND DEINTERLEAVING AND DEMAPPING METHOD FOR LDPC CODEWORD

Номер: US20190007067A1
Автор: Guan Yunfeng, Guo Xufeng, He Dazhi, Shi Yijun, Xu Yin, ZHANG Wenjun
Принадлежит:

An interleaving and mapping method and a deinterleaving and demapping method for an LDPC codeword are provided. The interleaving and mapping method comprises: performing first bit interleaving on a parity bits part of the LDPC codeword to obtain interleaved parity bits; splicing an information bit part of the codeword and the interleaved parity bits into a codeword after the first bit interleaving; dividing the codeword after the first bit interleaving into multiple consecutive bit subblocks in a predetermined length, and changing the order of the bit subblocks according to a corresponding permutation order (bit-swapping pattern) to form a codeword after second bit interleaving; dividing the codeword after the second bit interleaving into two parts, and writing the two parts into storage space in a column order respectively and reading the two parts from the storage space in a row order respectively to obtain a codeword after third bit interleaving. 1. A transmitter , comprising:a constellation mapper performing, according to a corresponding constellation diagram, constellation mapping on an LDPC codeword which is bit interleaved according to a bit interleaving pattern,wherein for LDPC codewords with different code lengths, code rates and LDPC code matrices tables, such that the capacity of bit interleaved coding and modulation is maximized, matched constellation diagrams and bit interleaving patterns are designed by means of theoretical analysis and optimization.2. The transmitter of claim 1 , whereinthe constellation diagram is distributed non-uniformly in a two-dimensional manner in a single quadrant, and distributed symmetrically in four quadrants.4. The transmitter of claim 3 , whereinthe constellation diagram is applicable to 16-QAM non-uniform constellation mapping,the constellation diagram is applicable to an LDPC codeword with a code length of 16200 bits or 64800 bits, andthe constellation diagram is applicable to an LDPC codeword with a code rate of 4/15 ...

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Номер записи: 75
03-01-2019 дата публикации

METHOD AND APPARATUS FOR TRANSCEIVING DATA IN A MIMO SYSTEM

Номер: US20190007111A1
Автор: Cheong Min Ho, CHOI Jee Yon, KIM Yun Joo, LEE IL-GU, Lee Jae Seung, Lee Sok-Kyu, OH Jong Ee, Park Jae Woo
Принадлежит:

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 ...

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Номер записи: 76
02-01-2020 дата публикации

METHOD AND SENSOR FOR DETECTING THE PRESENCE OF CO-CHANNEL JAMMING

Номер: US20200007248A1
Автор: LIN Chao
Принадлежит:

A method for detecting co-channel interference in a frequency-modulated multiplexed radio signal, the method including verifying that the multiplexed radio signal has a symmetric passband; detecting and counting a plurality of positive noise peaks and a plurality of negative noise peaks in the multiplexed radio signal during a predetermined measurement duration; calculating a rate of positive or negative noise peaks among the plurality of peaks; and determining a score characteristic of a probability that co-channel interference exists in the multiplexed radio signal on the basis of the rate of positive or negative noise peaks. 1. A method for detecting co-channel interference in a frequency-modulated multiplexed radio signal , said method comprising:verifying that said multiplexed radio signal has a symmetric passband;detecting and counting a plurality of positive noise peaks and a plurality of negative noise peaks in said multiplexed radio signal during a predetermined measurement duration;calculating a rate of positive or negative noise peaks among said plurality of peaks; anddetermining a score characteristic of a probability that co-channel interference exists in said multiplexed radio signal on the basis of said rate of positive or negative noise peaks.2. The method as claimed in claim 1 , wherein a positive or negative noise peak is taken into account only if said multiplexed radio signal has a symmetric passband.3. The method as claimed in claim 1 , comprising a prior step of comparing the signal-to-noise ratio of the multiplexed radio signal with a predetermined threshold claim 1 , a positive or negative noise peak being taken into account only if said signal-to-noise ratio in said multiplexed radio signal is greater than said predetermined threshold claim 1 , said predetermined threshold preferably being equal to 20 dB.4. The method as claimed in claim 1 , wherein said predetermined measurement time is equal to 128 ms claim 1 , plus or minus 10 ms.6. The ...

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Номер записи: 77
02-01-2020 дата публикации

TRANSMISSION APPARATUS AND METHOD, AND RECEPTION APPARATUS AND METHOD

Номер: US20200007266A1
Автор: IIDA Sachio, Kobayashi Seiji
Принадлежит:

Signal transmission with symbol correction is disclosed. In one example, processing includes selection of one of known data and unknown data for each of symbols, as transmission data, while selecting a symbol of the known data for a reception side at one or both of timings of immediately before and immediately after selection of a symbol of unknown data for the reception side, modulation of each of the symbols of the selected transmission data, and transmission of a transmission signal obtained. Moreover, processing includes: reception of a transmission signal transmitted from a transmission side; and correction of a symbol of unknown data included in the received transmission signal on the basis of a symbol of known data included in the received transmission signal. 1. A transmission apparatus comprising:a selection unit that selects one of knows data and unknown data for each of symbols, as transmission data, while selecting a symbol of the known data for a reception side at one or both of timings of immediately before and immediately after selection of a symbol of the unknown data for the reception side;a modulation unit that modulates each of the symbols of the transmission data, selected by the selection unit; anda transmission unit that transmits a transmission signal obtained by modulation of each of the symbols of the transmission data performed by the modulation unit.2. The transmission apparatus according to claim 1 ,wherein the known data is a synchronization pattern for synchronization.3The transmission apparatus according to claim 1 ,wherein the modulation unit applies Gaussian filtered minimum shift keying (GMSK) modulation to each of symbols of the transmission data.4. The transmission apparatus according to claim 3 ,wherein the modulation unit further applies chirp modulation on the transmission data.5. The transmission apparatus according to claim 1 ,wherein the transmission. unit transmits the transmission signal a plurality of times.6. The ...

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Номер записи: 78
03-01-2019 дата публикации

Temperature-Stable FBAR Transmitter

Номер: US20190007245A1
Автор: Sankaragomathi Kannan Aryaperumal, Schauer Justin, Wiser Robert Francis, Yeager Daniel
Принадлежит:

The present disclosure relates to a method that includes calculating a first frequency drift associated with an oscillator at a current temperature; based on the calculation, generating a first signal indicative of temperature compensation data; generating a second signal indicative of packet data and a modulation scheme; using the first signal, the second signal, and a first predetermined signal to generate a first tuning signal; and using the first tuning signal to tune a first capacitor array coupled to the oscillator and a second tuning signal to tune a second capacitor array coupled to the oscillator such that (i) the oscillator generates a modulated RF signal indicative of the packet data and (ii) the modulated RF signal has a second frequency drift that is less than a threshold. 1. A method comprising:calculating a frequency drift associated with an oscillator at a current temperature;based on the calculation, generating a first signal indicative of temperature compensation data;generating a second signal indicative of packet data and a modulation scheme;using the first signal and the second signal to generate a tuning signal; andusing the tuning signal to tune a capacitor array coupled to the oscillator such that (i) the oscillator generates a modulated RF signal indicative of the packet data and (ii) the modulated RF signal has a second frequency drift that is less than a threshold.2. The method of claim 1 , wherein the oscillator is a Pierce oscillator comprising a thin-film bulk acoustic resonator (FBAR).3. The method of claim 1 , wherein the modulation scheme is Gaussian Frequency Shift Keying (GFSK).4. The method of claim 1 , wherein the frequency drift is calculated based on the current temperature claim 1 , a turnover temperature claim 1 , and a gain coefficient.5. The method of claim 4 , wherein generating the second signal indicative of the packet data and the modulation scheme comprises:generating a serialized data stream based on the packet data; ...

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Номер записи: 79
20-01-2022 дата публикации

RESTRICTED EUCLIDEAN MODULATION

Номер: US20220021568A1
Автор: Bowen Patrick, Kundtz Nathan
Принадлежит:

A method and apparatus for using Euclidean modulation in an antenna are disclosed. In one embodiment, a method for controlling an antenna comprises mapping a desired modulation to achievable modulation states, mapping modulation values associated with the achievable modulation states to one or more control parameters, and controlling radio frequency (RF) radiating antenna elements using the one or more control parameters to perform beam forming. 120-. (canceled)21. A method for controlling an antenna having a plurality of antenna elements , the method comprising:determining modulation states for the plurality of antenna elements based on desired modulation states and achievable modulation states that are based on distances from one or more of the desired modulation states, the achievable modulation states being mapped to voltages applied to the antenna elements;mapping modulation values associated with achievable modulation states to one or more control parameters; andcontrolling radio frequency (RF) radiating antenna elements using the one or more control parameters to perform beam forming.22. The method of wherein the distances are Euclidean distances.23. The method of wherein each achievable modulation state corresponds to voltages applied to the antenna elements of the antenna to induce magnetic dipole moments.24. The method of wherein the one or more control parameters comprise a voltage to be applied to each of the RF radiating antenna elements.25. The method of wherein the RF radiating antenna elements comprise tunable elements in a metasurface.26. The method of further comprising mapping a desired modulation to achievable modulation states comprises approximating a set of required polarizabilities.27. The method of wherein mapping the desired modulation to achievable modulation states comprises selecting points out of achievable polarizabilities that approximate required polarizabilities of the desired modulation.28. The method of further comprising ...

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Номер записи: 80
20-01-2022 дата публикации

DATA COMPRESSION METHOD AND APPARATUS

Номер: US20220021570A1
Автор: Hu Yuanzhou, WANG Fan
Принадлежит: Huawei Technologies CO.,Ltd.

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 ...

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Номер записи: 81
08-01-2015 дата публикации

METHODS AND ARRANGEMENTS FOR COMMUNICATIONS IN LOW POWER WIRELESS NETWORKS

Номер: US20150010098A1
Автор: Kenney Thomas J., Perahia Eldad
Принадлежит:

Embodiments may comprise an orthogonal frequency division multiplexing (OFDM) system operating in the 1 GHz and lower frequency bands. In many embodiments, the physical layer logic may implement orthogonal frequency division multiplexing symbols encoded with 32 sub-carriers such as twenty data sub-carriers, four pilot sub-carriers, seven guard sub-carriers, and one direct current (DC) sub-carrier. Many embodiments may transform the orthogonal frequency division multiplexing symbols between frequency and time domains with a 32-point, fast Fourier transform or inverse fast Fourier transform. Some embodiments may up-convert and transmit a communication signal with the orthogonal frequency division multiplexing symbols at one megahertz. Further embodiments may receive and detect communications signal with the orthogonal frequency division multiplexing symbols at one megahertz. 1. A method comprising:modulating, by a transmitter, data streams based upon a modulation and coding scheme;mapping, by the transmitter, data of the data streams on transmit chains as the orthogonal frequency division multiplexing symbols encoded with sub-carriers comprising twenty data sub-carriers, four pilot sub-carriers, seven guard sub-carriers, and one direct current (DC) sub-carrier; andtransforming, by the transmitter, the sub-carriers with the orthogonal frequency division multiplexing symbols from a frequency domain into a time domain to create a communication signal.2. The method of claim 1 , further comprising up-converting the communication signal to a one megahertz channel.3. (canceled)4. The method of claim 1 , further comprising generating claim 1 , by the transmitter claim 1 , a number of data streams by interleaving five columns and four times a number of coded bits per single carrier (4*N) rows of the data.5. The method of claim 1 , further comprising generating claim 1 , by the transmitter claim 1 , a number of data streams by interleaving four columns and five times a number ...

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Номер записи: 82
10-01-2019 дата публикации

REDUCING NOISE IN A CAPACITIVE SENSOR

Номер: US20190011291A1
Автор: Agarwal Gaurav, ARUMUGAM Vikrant, GABORIAU Johann G., JAIN Nishant, Parupalli Vamsikrishna, YOU Zhong
Принадлежит: Cirrus Logic International Semiconductor Ltd.

A method for measuring a capacitive sensor output may include applying an excitation signal to a capacitor of the capacitive sensor which causes generation of a modulated signal from a baseband signal, wherein the excitation signal is of a carrier frequency which is higher than frequency content of the baseband signal, demodulating the modulated signal to generate an output signal representative of a capacitance of the capacitor wherein the demodulating is based, at least in part, on the excitation signal, determining whether noise in the modulated signal is caused by interference at approximately the carrier frequency, and in response to determining noise in the modulated signal is caused by interference at approximately the carrier frequency, modifying the carrier frequency to another frequency to reduce noise caused in the modulated signal by the interference. 1. A method for measuring a capacitive sensor output , comprising:applying an excitation signal to a capacitor of the capacitive sensor which causes generation of a modulated signal from a baseband signal, wherein the excitation signal is of a carrier frequency which is higher than frequency content of the baseband signal;demodulating the modulated signal to generate an output signal representative of a capacitance of the capacitor wherein the demodulating is based, at least in part, on the excitation signal;determining whether noise in the modulated signal is caused by interference at approximately the carrier frequency; andin response to determining noise in the modulated signal is caused by interference at approximately the carrier frequency, modifying the carrier frequency to another frequency to reduce noise caused in the modulated signal by the interference.2. The method of claim 1 , wherein the modulated signal is a digital signal and wherein demodulating the modulated signal comprises demodulating the modulated signal in a digital domain.3. The method of claim 1 , wherein the modulated signal is an ...

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Номер записи: 83
14-01-2016 дата публикации

Methods and Systems for Down-Converting a Signal Using a Complementary Transistor Structure

Номер: US20160013755A1
Автор: BULTMAN Michael J., COOK Robert W., JR. Charley D., LOOKE Richard C., MOSES, SORRELLS David F.
Принадлежит: PARKERVISION, INC.

Methods, systems, and apparatuses for down-converting an electromagnetic (EM) signal by aliasing the EM signal is described herein. Briefly stated, such methods, systems, and apparatuses operate by receiving an EM signal and an aliasing signal having an aliasing rate. The EM signal is aliased according to the aliasing signal to down-convert the EM signal. The term aliasing, as used herein, refers to both down-converting an EM signal by under-sampling the EM signal at an aliasing rate, and down-converting an EM signal by transferring energy from the EM signal at the aliasing rate. In an embodiment, the EM signal is down-converted to an intermediate frequency (IF) signal. In another embodiment, the EM signal is down-converted to a demodulated baseband information signal. In another embodiment, the EM signal is a frequency modulated (FM) signal, which is down-converted to a non-FM signal, such as a phase modulated (PM) signal or an amplitude modulated (AM) signal. 1. (canceled)2. A method for down-converting a carrier signal to a baseband signal , the method comprising:receiving the carrier signal, the carrier signaled modulated by at least one of an amplitude variation, a phase variation or a combination thereof;controlling a switching device with a control signal comprised of a plurality of aperture periods, the carrier signal input to the switching device and the control signal controlling the switching device so that the switching device is opened and closed at an aliasing rate based on the plurality of aperture periods;sampling energy in the modulated carrier signal by generating a plurality of energy samples obtained by transferring a portion of energy from the modulated carrier signal to a storage capacitor each time the switching device is closed by the control signal;discharging at the storage capacitor, when the switching device is open, some but not all of the energy transferred to the storage capacitor, a remaining portion of the energy that is not ...

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Номер записи: 84
11-01-2018 дата публикации

DOWNLINK SIGNALING IN A HIGH EFFICIENCY WIRELESS LOCAL AREA NETWORK (WLAN)

Номер: US20180013527A1
Автор: Chu Liwen, JIANG Jinjing, Sun Yakun, Wang Lei, Zhang Hongyuan
Принадлежит:

A method for generating a physical layer (PHY) data unit includes generating a first signal field to include multiple copies of first signal field content, wherein the first signal field content spans one sub-band of a plurality of sub-bands of the PHY data unit, and wherein the multiple copies collectively span the plurality of sub-bands of the PHY data unit; generating a second signal field to include multiple copies of second signal field content, wherein the second signal field content spans multiple ones of the plurality of sub-bands of the PHY data unit, and wherein the multiple copies of the second signal field collectively span the plurality of sub-bands of the PHY data unit; generating a preamble of the PHY data unit to include at least the first signal field and the second signal field; generating the PHY data unit to include at least the preamble. 1. A method for generating a physical layer (PHY) data unit for transmission via a communication channel , the method comprising:generating, by a first communication device, a first signal field to include multiple copies of first signal field content, wherein the first signal field content includes an identifier of a wireless network in which the PHY data unit is being transmitted, wherein the first signal field content spans one sub-band of a plurality of sub-bands of the PHY data unit, and wherein the multiple copies collectively span the plurality of sub-bands of the PHY data unit; the common block includes a frequency resource unit allocation field having a length that varies depending on a bandwidth of the PHY data unit, the frequency resource unit allocation field indicating i) widths and locations of frequency resource units in a data portion of the PHY data unit, and ii) a respective number of users allocated to each frequency resource unit, and', 'each of at least some user blocks corresponds to a respective frequency resource unit, includes an identifier of a second communication device to which the ...

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Номер записи: 85
14-01-2016 дата публикации

Method and apparatus for allocating a control channel resource of a relay node in a backhaul subframe

Номер: US20160013912A1
Автор: Hyoung Ju Ji, Joon Young Cho
Принадлежит: SAMSUNG ELECTRONICS CO LTD

A method and apparatus for configuring a control channel between a first transceiver and a second transceiver in a communication system are provided. The method includes generating, by the first transceiver, a signaling message including information for the control channel; transmitting, by the first transceiver, the signaling message including information for the control channel to the second transceiver; generating, by the first transceiver, the control channel based on the information for the control channel; and transmitting, by the first transceiver, the generated control channel to the second transceiver, wherein the information for the control channel includes resource allocation information, and information related to whether interleaving applied and a type of reference signal.

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Номер записи: 86
14-01-2016 дата публикации

RADIO TRANSMISSION METHOD AND ADAPTED RADIO TRANSMITTER

Номер: US20160013960A1
Автор: FILHOL Didier, Martin Eric
Принадлежит: TELECOM DESIGN

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 ...

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Номер записи: 87
10-01-2019 дата публикации

Multi-dimensional signal encoding

Номер: US20190013990A1
Автор: Harvey C. Woodsum, Richard C. Gerdes
Принадлежит: TM IP Holdings LLC

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.

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Номер записи: 88
11-01-2018 дата публикации

Cell Timing in a Wireless Device and Base Station

Номер: US20180014263A1
Автор: Dinan Esmael Hejazi
Принадлежит:

Methods and apparatuses are described for wireless communications. Cells may be grouped into a plurality of cell groups. A time adjustment may be determined and applied to uplink transmission timing of a cell group. A transmission timing difference between a first cell group and a second cell group may be determined. If the transmission timing difference exceeding a threshold, one or more devices may stop transmitting uplink signals via one or more secondary cells and/or may stop applying the timing adjustment for a cell group. 1. A method comprising: uplink transmission timing associated with the first cell group is based on a first cell of the first cell group; and', 'uplink transmission timing associated with the second cell group is based on a second cell of the second cell group;, 'receiving, by a wireless device, at least one control message comprising configuration parameters of a plurality of cells grouped into a plurality of cell groups comprising a first cell group and a second cell group, whereintransmitting, by the wireless device and via one or more secondary cells of the plurality of cells, uplink signals;determining a timing adjustment for at least one cell group of the plurality of cell groups;determining a transmission timing difference between the first cell group and the second cell group;responsive to the transmission timing difference not exceeding a threshold, applying the timing adjustment to the uplink signals of the at least one cell group; and stopping transmitting, via the one or more secondary cells, the uplink signals; or', 'continuing transmitting, via the one or more secondary cells, the uplink signals, without applying the timing adjustment to the uplink signals of the at least one cell group., 'responsive to the transmission timing difference exceeding the threshold2. The method of claim 1 , further comprising stopping transmitting claim 1 , via the one or more secondary cells claim 1 , the uplink signals.3. The method of claim 1 , ...

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Номер записи: 89
14-01-2016 дата публикации

Communication support for low capability devices

Номер: US20160014740A1
Автор: Aris Papasakellariou, Hyoung-Ju JI, Young-Bum Kim
Принадлежит: SAMSUNG ELECTRONICS CO LTD

Methods and apparatuses for transmitting and receiving signaling, by a User Equipment (UE) with reduced processing capabilities, to conserve power are provided. A method for transmitting from a network a Physical Downlink Shared CHannel (PDSCH) to a first User Equipment (UE) from a first class of UEs or to a second UE from a second class of UEs, includes transmitting a PDSCH to the first UE using a first bandwidth unit; and transmitting a PDSCH to the second UE using a second bandwidth unit, wherein the second bandwidth unit is smaller than the first bandwidth unit.

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Номер записи: 90
14-01-2021 дата публикации

SIGNAL GENERATION METHOD, TRANSMISSION DEVICE, RECEPTION METHOD, AND RECEPTION DEVICE

Номер: US20210013938A1
Автор: Kimura Tomohiro, MURAKAMI Yutaka, Ouchi Mikihiro
Принадлежит:

A signal generation method is used in a transmission device that transmits a plurality of transmission signals from a plurality of antennas at the same frequency and at the same time, in the case where larger power change is performed on a first transmission signal than on a second transmission signal during generation process of the first transmission signal and the second transmission signal, the first transmission signal and the second transmission signal are mapped before the power change such that a minimum Euclidian distance between possible signal points for the first signal is longer than a minimum Euclidian distance between possible signal points for the second signal. 1. A transmission method used in a transmission system that includes a first transmission station and a second transmission station , the transmission method comprising:performing, by the first transmission station, first phase changing on signals included in a first orthogonal frequency-division multiplexing (OFDM) frame according to a first phase changing pattern or a second phase changing pattern;performing, by the second transmission station, second phase changing on signals included in a second OFDM frame according to a third phase changing pattern or a fourth phase changing pattern, the second OFDM frame being identical to the first OFDM frame;converting, by the first transmission station, a first control information modulated signals to generate a first preamble, and converting, by the first transmission station, the first OFDM frame to generate a first OFDM signal, the first control information modulated signals being generated from control information;converting, by the second transmission station, a second control information modulated signals to generate a second preamble, and converting, by the second transmission station, the second OFDM frame to generate a second OFDM signal, the second control information modulated signals being identical to the first control information ...

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Номер записи: 91
14-01-2021 дата публикации

DATA PROCESSING FOR AUTOMATIC MODULATION CLASSIFICATION OF WIRELESS SIGNALS

Номер: US20210014092A1
Автор: BLAIR Ballard J., CHANDNA Bindu, EGNOR Dianne E., MARCOUX Caitlyn N.
Принадлежит: The Mitre Corporation

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. ...

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Номер записи: 92
09-01-2020 дата публикации

APPARATUS, SYSTEM AND METHOD OF COMMUNICATING ACCORDING TO A TRANSMIT SPACE-FREQUENCY DIVERSITY SCHEME

Номер: US20200014439A1
Автор: Cordeiro Carlos, Genossar Michael, Lomayev Artyom, Maltsev Alexander
Принадлежит: Intel Corporation

For example, a wireless station may be configured to modulate a plurality of data bit sequences into a plurality of data blocks according to a dual carrier modulation, to map the plurality of data blocks to a plurality of spatial streams according to a space-time diversity scheme, and to transmit a MIMO transmission based on the plurality of spatial streams. 1. (canceled)2. An apparatus comprising:memory circuitry; and modulate encoded data bits into a plurality of data blocks according to a Dual Carrier Modulation (DCM), a data block of the plurality of data blocks comprising a plurality of pairs of complex constellation points;', 'map the plurality of data blocks to a first stream and a second stream,', 'wherein a first pair of complex constellation points in a first data block of the plurality of data blocks is mapped to two first pairs of encoded points over two first pairs of data subcarriers, one pair of the two first pairs of encoded points comprises the first pair of complex constellation points, another pair of the two first pairs of encoded points comprises a complex conjugate of the first pair of complex constellation points, one pair of the two first pairs of data subcarriers comprises a k-th subcarrier and a P(k)-th subcarrier in a first OFDM symbol in the first stream, another pair of the two first pairs of data subcarriers comprises a k-th subcarrier and a P(k)-th subcarrier in a second OFDM symbol in the second stream, wherein P(k) is a predefined function of k,', 'and wherein a second pair of complex constellation points in a second data block of the plurality of data blocks is mapped to two second pairs of encoded points over two second pairs of data subcarriers, one pair of the two second pairs of encoded points comprises the second pair of complex constellation points, another pair of the two second pairs of encoded points comprises a sign-inversed complex conjugate of the second pair of complex constellation points, one pair of the two second ...

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Номер записи: 93
09-01-2020 дата публикации

REFERENCE SIGNAL SEQUENCE IDENTIFICATION IN WIRELESS COMMUNICATIONS

Номер: US20200014569A1
Автор: Chen Wanshi, Gaal Peter, Huang Yi, Wang Xiao Feng
Принадлежит:

Methods, systems, and devices for wireless communications are described in which a base station may provide an indication of a reference signal to be used in demodulation of a π/2 BPSK modulation scheme for communications between a UE and the base station. The base station may indicate whether a first type of reference signal or a second type of reference signal is to be transmitted. The second type of reference signal may be a π/2 BPSK DMRS that has a reference signal sequence that has a lower PAPR. The second type of reference signal sequence may be a power deboosted version of the first reference signal sequence. The indication from the base station of the type of reference signal may be provided via RRC signaling, such as a cell-specific RRC transmission or a UE-specific RRC transmission. 1. A method for wireless communication at a user equipment (UE) , comprising:establishing a connection with a base station that uses a π/2 binary phase shift keying (BPSK) modulation scheme for at least a portion of wireless communications with the base station;receiving, from the base station, an indication of a type of reference signal sequence to be included within transmissions that use the π/2 BPSK modulation scheme;generating a reference signal based at least in part on the indication of the type of reference signal sequence; andtransmitting the reference signal within communications that use the π/2 BPSK modulation scheme.2. The method of claim 1 , wherein the indication of the type of reference signal sequence indicates a first type of reference signal sequence or a second type of reference signal sequence.3. The method of claim 2 , wherein the second type of reference signal sequence has a lower peak to average power ratio (PAPR) than the first type of reference signal sequence.4. The method of claim 2 , wherein the second type of reference signal sequence is a power deboosted version of the first type of reference signal sequence.5. The method of claim 2 , wherein:the ...

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Номер записи: 94
21-01-2016 дата публикации

Wireless communication device, electronic apparatus, and moving object

Номер: US20160020789A1
Автор: Hisahiro Ito
Принадлежит: Seiko Epson Corp

A wireless communication circuit includes a vibration piece, and a semiconductor device that is connected to the vibration piece in order to integrate the vibration piece and a wireless communication IC into one package and thus to produce a wireless communication device by which a high-precision oscillation frequency is obtained. The semiconductor device includes an oscillation circuit of the vibration piece, and a wireless communication circuit that has an amplifier which amplifies a wireless signal that is generated by an oscillation signal from the oscillation circuit. The vibration piece and the semiconductor device are accommodated in one package. An excitation electrode of the vibration piece is arranged in the package in such a manner that the excitation electrode is not superimposed on the amplifier when the semiconductor device is viewed from above.

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Номер записи: 95
21-01-2016 дата публикации

CIRCUIT DEVICE, TRANSMISSION MODULE, ELECTRONIC APPARATUS, AND MOVING OBJECT

Номер: US20160020927A1
Автор: Shiozaki Nobutaka
Принадлежит:

To provide different paths for communication of a serial signal required for high-speed communication and communication of transmission data that may be handled in low-speed communication, a circuit device includes a serial interface that receives a serial signal transmitted from a controller at a first communication speed, a transmission data input terminal that receives transmission data transmitted from the controller at a second communication speed slower than the first communication speed, and a transmission circuit that outputs a transmission signal corresponding to the transmission data based on the serial signal and the transmission data.

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Номер записи: 96
21-01-2016 дата публикации

Signal concentrator device

Номер: US20160020932A1
Автор: Ludovic Champion, Nicolas Sornin
Принадлежит: Semtech Corp

A gateway device having a baseband processor for processing a plurality signals carrying a digital information modulated in the form of chirp signal, the chirp signals being either base chirps, for which the frequency changes from an initial instant to a final instant according to a predetermined base chirp function or modulated chirps, whose instantaneous frequencies vary according to one of a plurality of a functions that differ from said base chirp function, characterized in that the gateway device is arranged for simultaneously demodulating a plurality of signals having received at a same frequency and exhibiting different bitrates.

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Номер записи: 97
03-02-2022 дата публикации

TRANSMISSION DEVICE AND TRANSMISSION METHOD

Номер: US20220038326A1
Автор: Kimura Tomohiro, Motozuka Hiroyuki, MURAKAMI Yutaka, Ouchi Mikihiro
Принадлежит:

A transmission device includes: a weighting synthesizer that generates a first precoded signal and a second preceded signal; a first pilot inserter that inserts a pilot signal into the first precoded signal; a phase changer that applies a phase change of i×Δλ to the second precoded signal, where i is a symbol number and an integer that is greater than or equal to 0; an inserter that inserts a pilot signal into the phase-changed second precoded signal; and a phase changer that applies a phase change to the phase-changed and pilot-signal-inserted second precoded signal. Δλ satisfies π/2 radians<Δλ<π radians or π radians<Δλ<3π/2 radians. 12-. (canceled)3. A transmission method comprising:receiving, from a communication apparatus, first control information indicating whether a Discrete Fourier Transform-spread-Orthogonal Frequency Division Multiplexing (DFT-s-OFDM) transmission scheme or an OFDM transmission scheme is to be performed;selecting a precoding matrix from among matrices and precoding modulated symbols with the precoding matrix selected if the first control information indicates that the DFT-s-OFDM is to be performed, the precoding matrices including a first matrix according to which phase shift is performed on at least one symbol of the modulated symbols; andtransmitting the modulated symbols to the communication apparatus according to the first control information.4. The transmission method according to claim 3 , further comprising:selecting a modulation scheme from among modulation schemes, the modulation schemes including a π/2-shift Binary Phase-Shift Keying (BPSK) scheme; andmodulating encoded information to generate the modulated symbols according to the modulation scheme selected.5. A transmission device comprising:a receiver configured to receive, from a communication apparatus, first control information indicating whether a Discrete Fourier Transform-spread-Orthogonal Frequency Division Multiplexing (DFT-s-OFDM) transmission scheme or an OFDM ...

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Номер записи: 98
18-01-2018 дата публикации

ASYNCHRONOUS WIRELESS SENSING

Номер: US20180019862A1
Автор: Kliewer Joerg, Tang Wei
Принадлежит:

Low-complexity asynchronous wireless sensing and communication architecture is disclosed for low power wireless sensors. Schemes are based on asynchronous digital communications and Ultra-Wideband impulse radios. In asynchronous radio, combination of frequency-shift-keying (FSK) and on-off-keying (OOK) to remove clock synchronization is applied. Improved asynchronous non-coherent transmitters and receivers achieve both low power and low complexity while seamlessly combined with asynchronous level-crossing modulation. Both uncoded and coded asynchronous communication may be utilized. Coded asynchronous communication may use error correction. Forward error correction schemes for asynchronous sensor communication are utilized where dominant errors consist of pulse deletions and insertions, and where instantaneous encoding takes place. Forward error correction is also accomplished where a continuous-time sparse waveform signal is asynchronously sampled and communicated over a noisy channel via Q-ary frequency-shift keying. Concatenated code employs outer systematic convolutional codes and inner embedded marker codes that preserve timing information and protect against symbol insertions and deletions. 1. A method of asynchronous wireless sensing , comprising:utilizing a forward error correction scheme for asynchronous sensor communication, wherein dominant errors consist of pulse deletions and insertions, and encoding is instantaneous;combining a systematic convolutional code, an embedded marker code, and a power-efficient frequency shift keying (FSK) modulation at a sensor node;obtaining decoding via a maximum a-posteriori (MAP) decoder for the marker code to achieve synchronization for an insertion and deletion channel; and then MAP decoding for the convolutional code;wherein, effective data rate and energy efficiency are improved and bit-error-rate (BER) and electromagnetic noise emissions are reduced.2. The method of claim 1 , further includes utilizing both a ...

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Номер записи: 99
18-01-2018 дата публикации

DEVICE AND METHOD FOR TRANSMITTING DATA

Номер: US20180019907A1
Автор: Lankl Berthold
Принадлежит: Universitaet der Bundeswehr Muenchen

A method for transmitting data, wherein along a transmission path: (i) a modulated carrier signal is generated based on the data to be transmitted, the carrier signal having a carrier frequency within a given transmission channel, which is comprised of a number of frequencies, and (ii) the modulated carrier signal is amplified to a transmission signal, wherein along a compensation path: (i) the modulated carrier signal is filtered, whereby the frequency components within the transmission channel are removed, and at least one of a phase, an amplitude, and/or a delay of the filtered signal is modified thereby generating a compensation signal, and wherein the compensation signal is subtracted from the transmission signal thereby generating a compensated transmission signal, and wherein the compensated transmission signal is transmitted. Also a respective data transmission device is disclosed. 1. A method for transmitting data ,generating, along a transmission path based on the data to be transmitted, a modulated carrier signal with a constant envelope waveform, the carrier signal having a carrier frequency within a given transmission channel, which is comprised of a number of frequencies;amplifying the modulated carrier signal to a transmission signal;filtering, along a compensation path, the modulated carrier signal, wherein frequency components within the transmission channel are removed, and at least one of a phase, an amplitude, or a delay of the filtered signal is modified thereby generating a compensation signal;subtracting the compensation signal from the transmission signal, thereby generating a compensated transmission signal, wherein the compensated transmission signal is transmitted; andcomparing, along a feedback path, the compensated transmission signal with the compensation signal or with the filtered signal, and at least one of the phase, the amplitude, or the delay of the compensation signal is adapted based on the comparison result.2. The method ...

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Номер записи: 100