Particular Pulse Demodulator Or Detector Patents (Class 375/340)
  • Publication number: 20150063497
    Abstract: In an embodiment, an apparatus includes a first tuner to receive a radio frequency (RF) signal from a first antenna and to process the RF signal to generate a first time-domain quadrature signal, a second tuner to receive the RF signal from a second antenna and to process the RF signal to generate a second time-domain quadrature signal, and a combiner circuit to receive the first and second time-domain quadrature signals.
    Type: Application
    Filed: August 30, 2013
    Publication date: March 5, 2015
    Inventors: Javier Elenes, Dana Taipale
  • Publication number: 20150063501
    Abstract: To improve a quality of a combined signal obtained by maximum ratio combining performed when a transmission signal of OFDM system is diversity-received with a small computation amount or a small circuit size. In a receiving apparatus, a combining unit corrects, when combining a sub-carrier signal of each branch obtained by performing Fourier transform on a reception signal of each branch at a maximum ratio for each sub-carrier, a weighting coefficient of each branch according to a magnitude relation of an intensity of the reception signal of each branch before Fourier transform. Specifically, the combining unit corrects the weighting coefficient of each branch so as to weaken an influence of a transmission path response estimated for a sub-carrier signal of the branch in branches with smaller reception signal intensities.
    Type: Application
    Filed: November 6, 2014
    Publication date: March 5, 2015
    Inventors: Kichung KIM, Hiroki SUGIMOTO
  • Publication number: 20150063502
    Abstract: Data may be transmitted from a RAN node to a wireless terminal using a MIMO antenna array. A plurality of unmapped symbol blocks may be generated. Symbols of a first one of the plurality of unmapped symbol blocks may be mapped to first and second mapped symbol blocks so that the first mapped symbol block includes symbols of the first unmapped symbol block and so that the second mapped symbol block includes symbols of the first unmapped symbol block. The symbols of the first and second mapped symbol blocks may be precoded to provide precoded symbols of respective first and second MIMO precoding layers using a MIMO precoding vector. Each of the precoded symbols of the first and second MIMO precoding layers may be transmitted through the MIMO antenna array to the wireless terminal using a same TFRE. Related devices and terminals are also discussed.
    Type: Application
    Filed: November 6, 2014
    Publication date: March 5, 2015
    Applicant: Telefonaktiebolaget L M Ericsson (publ)
    Inventors: Sairamesh Nammi, Bo GÖRANSSON, Erik Larsson
  • Publication number: 20150063498
    Abstract: Systems and methods are provided for efficient tree-based detection of multi-carrier modulated signals, such as Orthogonal Frequency Division Multiplexing (OFDM) symbols. In an embodiment, a plurality of signals occupying respective tones are received and processed to determine an order, based on a tone quality metric, for the plurality of signals. The plurality of signals are then dispatched to a pool of tree detectors in accordance with the order. In an embodiment, the order ensures that signals occupying higher quality tones, and requiring shorter detection times, are dispatched first to the pool of tree detectors. In another embodiment, a maximum runtime of busy tree detectors of the pool is updated based signal on actual detection times to exploit the time slack of early terminating detectors.
    Type: Application
    Filed: September 4, 2013
    Publication date: March 5, 2015
    Applicant: Broadcom Corporation
    Inventors: Louay JALLOUL, Mohammad Mansour, Sam Alex
  • Publication number: 20150063496
    Abstract: A receiver includes a radio frequency (RF) front end receives a received signal that is modulated via orthogonal frequency division multiplexing (OFDM) and generates a downconverted signal, based on the received signal. An OFDM demodulator generates subcarrier data based on the downconverted signal. The subcarrier data corresponds to a plurality of subcarriers. A subcarrier weighting module generates weighted subcarrier data by applying subcarrier weights to the subcarrier data corresponding to selected ones of the plurality of subcarriers. An OFDM decoder generates decoded OFDM data based on the weighted subcarrier data.
    Type: Application
    Filed: August 30, 2013
    Publication date: March 5, 2015
    Applicant: BROADCOM CORPORATION
    Inventors: Nooshin Doctor Vakilian, Masoud Kahrizi, Alireza Tarighat Mehrabani
  • Publication number: 20150063500
    Abstract: A single receive chain of a MIMO receiver is activated during a low power listen mode. Upon detecting a legacy short training field (L-STF) in a received packet, the single receive chain performs a first frequency estimation, and activates one or more additional receive chains of the MIMO receiver. The MIMO receiver uses maximal ratio combining (MRC) to receive the signal using the first receive chain and the one or more additional activated receive chains, wherein the MRC is based, at least in part, on the first frequency estimation. The MIMO receiver may determine whether the received packet is a high throughput/very high throughput (HT/VHT) packet, and if not, deactivate the one or more additional receive chains. In one alternative, the additional receive chains are not activated until determining that a HT/VHT packet has been received.
    Type: Application
    Filed: October 14, 2014
    Publication date: March 5, 2015
    Inventors: Kai Shi, Paul Husted, Ning Zhang
  • Publication number: 20150063491
    Abstract: A method and an apparatus for transmitting broadcast signals thereof are disclosed. The apparatus for transmitting broadcast signals comprises an encoder for encoding service data corresponding to each of a plurality of transmission unit, wherein the each of a plurality of transmission unit carries at least one service component, a frame builder for building at least one signal frame including the encoded service data, a phase distortion unit for performing a phase distortion on data in the built at least one signal frame, a modulator for modulating data in the built at least one signal frame by an OFDM (Orthogonal Frequency Division Multiplex) scheme and a transmitter for transmitting the broadcast signals including the modulated data.
    Type: Application
    Filed: September 4, 2014
    Publication date: March 5, 2015
    Inventors: Woochan KIM, Jongseob BAEK, Chulkyu MUN, Woosuk KO, Sungryong HONG
  • Patent number: 8971426
    Abstract: The present invention relates to a wireless communication system, and an adaptive multiple antenna transmission method and apparatus in accordance with antenna transmission power are disclosed. A method of performing multiple antenna transmission from a terminal to a base station according to one embodiment of the present invention may include the steps of: determining a reference value for a transmission power of each of a plurality of transmit antennas of the terminal; grouping the plurality of transmit antennas into a first group of transmit antennas and a second group of transmit antennas in accordance with the determined reference value; and transmitting a signal to the base station through at least one of the first group of the transmit antennas and the second group of transmit antennas.
    Type: Grant
    Filed: May 24, 2010
    Date of Patent: March 3, 2015
    Assignee: LG Electronics Inc.
    Inventors: Hyun Soo Ko, Moon Il Lee, Ja Ho Koo, Jae Hoon Chung, Bin Chul Ihm
  • Patent number: 8971456
    Abstract: A receiver for a wireless communication device provides a dual path receiver receiving first and second protocol-agnostic, uncorrelated receive signals simultaneously. The dual path receiver generating first and second offset IF signals from the simultaneously received first and second protocol-agnostic, uncorrelated receive signals. The receiver utilizes at least one converter for converting the first and second offset IF signals into at least one serial synchronous interface (SSI) signal representing the spectrum at IF. At least one processor receives the at least one SSI signal and applies parallel processing paths to demodulate the at least one SSI signal into separate baseband signals. The processor provides interference detection of, and level control for, the first and second offset IF signals.
    Type: Grant
    Filed: December 19, 2011
    Date of Patent: March 3, 2015
    Assignee: Motorola Solutions, Inc.
    Inventors: Ariel L. Galan, Young-Seo Park, Charles H. Carter, Charles R. Ruelke, Darrell Stogner
  • Patent number: 8971458
    Abstract: The present invention relates to space-time or space-frequency coding in cellular systems. The same data is transmitted from different antennas with different coverage areas, corresponding to different cells. The different data streams have different parts of the space-time block codes applied. A mobile terminal can combine the different parts of the space-time block codes in different received signals. This provides better performance than the known techniques for single frequency networks. The invention can also be applied to antennas with different coverage areas from the same site, and different beams formed with antenna arrays.
    Type: Grant
    Filed: February 20, 2014
    Date of Patent: March 3, 2015
    Assignees: Koninklijke Philips N.V., Sharp Corporation
    Inventors: Timothy James Moulsley, David Keith Roberts, Matthew Peter John Baker, Xusheng Wei
  • Patent number: 8971472
    Abstract: A signal processing circuit includes a PLL circuit configured to lock to a frequency contained in an input signal, a signal generating circuit configured to detect a direct-current component of a signal that is obtained by shifting frequencies of the input signal by a displacement equal to the locked frequency, and to generate a signal that has an amplitude responsive to the detected direct-current component and that has the same frequency and phase as a signal component of the locked frequency of the input signal, and a subtraction circuit configured to subtract the signal generated by the signal generating circuit from the input signal.
    Type: Grant
    Filed: November 18, 2013
    Date of Patent: March 3, 2015
    Assignee: Fujitsu Limited
    Inventor: Hideki Furudate
  • Patent number: 8971457
    Abstract: Systems and methods for removing a DC offset from an orthogonal frequency division multiplexed (OFDM) signal transmitted over a plurality of subcarrier frequencies. The system includes a receiver. The system further includes a high pass DC component filter configured to reduce a DC component of the orthogonal frequency division multiplexed signal, the high pass DC component filter shaping noise in the orthogonal frequency division multiplexed signal which results in a non-uniform power spectral density of the noise across the plurality of subcarrier frequencies. The system further includes a noise whitener configured to compensate for the noise shaping by the high pass DC component filter by normalizing the non-uniform power spectral density of the noise across the plurality of subcarrier frequencies.
    Type: Grant
    Filed: October 9, 2012
    Date of Patent: March 3, 2015
    Assignee: Marvell International Ltd.
    Inventors: Rohit U. Nabar, Hongyuan Zhang
  • Patent number: 8971435
    Abstract: Multi-user sparse space codes are proposed as a new transmission scheme for uplink communication over a multi-user multiple-input-multiple-output (MIMO) communication channel.
    Type: Grant
    Filed: July 25, 2012
    Date of Patent: March 3, 2015
    Assignee: BlackBerry Limited
    Inventors: Sagar Dhakal, Amin Mobasher, Steve Hranilovic, Alireza Bayesteh
  • Patent number: 8971396
    Abstract: A method and system are provided for performing Decision Feedback Equalization (DFE) and Decision Feedback Sequence Estimation (DFSE) in high-throughput applications that are not latency critical. In an embodiment, overlapping blocks of samples are used to allow for the parallelization of the computation and the breaking of the critical path. In addition, the overlap of the windows addresses issues associated with performance loss due to what is termed “ramp-up” and “ramp-down” BER loss.
    Type: Grant
    Filed: August 22, 2013
    Date of Patent: March 3, 2015
    Assignee: PMC-Sierra US, Inc.
    Inventors: Stephen Bates, Peter John Waldemar Graumann
  • Patent number: 8971462
    Abstract: A channel quality determining circuit includes a receiving circuit and a determining circuit. The receiving circuit is used for receiving a header of at least one packet transmitted in a signal transmitting channel. The determining circuit is coupled to the receiving circuit, and used for determining if a channel quality of the signal transmitting channel satisfies a predetermined quality standard according to the header of at least one packet.
    Type: Grant
    Filed: September 28, 2011
    Date of Patent: March 3, 2015
    Assignee: Realtek Semiconductor Corp.
    Inventor: Chung-Yao Chang
  • Patent number: 8971468
    Abstract: The methods and apparatus disclosed herein provide an operative system for increasing the resolution of serial DRUs based on interleaved free running oversamplers. In particular, this system uses incoming data to measure and to compensate the skew between two or more free running oversamplers (e.g., SerDes), without the need for any hardware design requirement relating to the precision of the relative skew of the oversamplers.
    Type: Grant
    Filed: October 28, 2013
    Date of Patent: March 3, 2015
    Assignee: Xilinx, Inc.
    Inventor: Paolo Novellini
  • Publication number: 20150055735
    Abstract: A multiple-input multiple output (MIMO) receiver includes circuitry to receive a MIMO transmission through a plurality of antennas over a channel comprising two or more 20 MHz portions of bandwidth. The MIMO transmission comprises a plurality of streams, each transmitted over a corresponding spatial channel and configured for reception by multiple user stations. The MIMO receiver also includes circuitry to simultaneously accumulate signal information within at least two or more of the 20 MHz portions of bandwidth. Each 20 MHz portion comprises a plurality of OFDM subcarriers. The MIMO receiver also includes circuitry to demodulate at least one of the steams using receive beamforming techniques. In this way, multi-user protocol data units can be received.
    Type: Application
    Filed: October 10, 2014
    Publication date: February 26, 2015
    Inventors: Alexander Maltsev, Ali S. Sadri, Sergey E. Sergeyev, Alexander N. Belonozhkin, Vadim Sergeyev
  • Publication number: 20150055728
    Abstract: The present invention relates to a method of transmitting and a method of receiving signals an corresponding apparatus. One aspect of the present invention relates to an efficient L1 signaling method for an efficient transmitter and an efficient receiver using the efficient L1 signaling method for an efficient cable broadcasting.
    Type: Application
    Filed: September 2, 2014
    Publication date: February 26, 2015
    Inventors: Woo Suk KO, Sang Chul MOON
  • Patent number: 8964907
    Abstract: According to an example embodiment, a communications receiver may include a variable gain amplifier (VGA) configured to amplify received signals, a VGA controller configured to control the VGA, a plurality of analog to digital converter (ADC) circuits coupled to an output of the VGA, wherein the plurality of ADC circuits are operational when the communications receiver is configured to process signals of a first communications protocol, and wherein only a subset of the ADC circuits are operational when the communications receiver is configured to process signals of a second communications protocol.
    Type: Grant
    Filed: April 26, 2013
    Date of Patent: February 24, 2015
    Assignee: Broadcom Corporation
    Inventors: Vivek Pundlik Telang, Hong Chen, Vasudevan Parthasarathy, Jun Cao, Afshin Momtaz, Ali Ghiasi, Chung-Jue Chen
  • Patent number: 8964901
    Abstract: Receiver design techniques are provided that are capable of producing relatively efficient, linear radio frequency (RF) receivers. During a design process, components of an analog receiver chain and digital nonlinearity compensation techniques are considered together to achieve reduced power consumption in the receiver.
    Type: Grant
    Filed: July 25, 2013
    Date of Patent: February 24, 2015
    Assignee: Massachusetts Institute of Technology
    Inventors: Helen Kim, Merlin Green, Andrew Bolstad, Daniel D. Santiago, Michael N. Ericson, Karen Gettings, Benjamin A. Miller
  • Patent number: 8964886
    Abstract: A wireless communication system provides a method and device for transmitting a preamble. A transmitter generates a first preamble sequence used for frequency offset estimation and generates a second preamble sequence according to the transmission mode. The transmitter transmits the first and second preamble sequences. With respect to the second preamble sequence, the phase thereof may be shifted into different phase offsets according to the transmission mode.
    Type: Grant
    Filed: February 9, 2011
    Date of Patent: February 24, 2015
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Jung Sun Um, Sung Hyun Hwang, Sang Won Kim, Byung Jang Jeong, Chang Joo Kim
  • Patent number: 8964909
    Abstract: The present invention provides for making code rate adjustments and modulation type adjustments in a pseudonoise (PN) encoded CDMA system. Coding rate adjustments may be made by changing the number of information bits per symbol, or Forward Error Code (FEC) coding rate. A forward error correction (FEC) block size is maintained at a constant amount. Therefore, as the number of information bits per symbol are increased, an integer multiple of bits per epoch is always maintained. The scheme permits for a greater flexibility and selection of effective data rates providing information bit rates ranging from, for example, approximately 50 kilobits per second to over 5 mega bits per second (Mbps) in one preferred embodiment.
    Type: Grant
    Filed: June 11, 2012
    Date of Patent: February 24, 2015
    Assignee: Intel Corporation
    Inventors: John E. Hoffman, George Rodney Nelson, Jr., Daniel I. Riley, Antoine J. Rouphael, James A. Proctor, Jr.
  • Patent number: 8964894
    Abstract: A circuit arrangement (1) is described for compensating an attenuation (Ko, Ka, Ka1, Ka2) occurring in an antenna signal connection (2) between a mobile terminal (3) and an antenna (4) with at least one antenna signal amplifier (5a, 5b) in the antenna signal connection (2) and with a control unit (8) for setting an amplification factor (V) by which the antenna signal routed through an allocated antenna signal amplifier (5a, 5b) is amplified or attenuated. The circuit arrangement (1) has a detection unit (7) for detecting an antenna signal power (P) of the antenna signal in the signal path of the antenna signal connection (2).
    Type: Grant
    Filed: February 17, 2014
    Date of Patent: February 24, 2015
    Assignee: Bury Sp.z.o.o.
    Inventor: Eckhard Bollmann
  • Patent number: 8964906
    Abstract: A digital signal processing (DSP) apparatus is used for processing a plurality of different signals. The DSP apparatus includes a DSP module configured to perform a DSP algorithm on samples of the signals. The DSP apparatus also has a parameter memory that includes a plurality of memory cells. The parameter memory has a signal number input and a parameter output. The parameter output is connected to the DSP module. The parameter memory is configured to output to the parameter output a parameter corresponding to a signal identifier at the signal number input.
    Type: Grant
    Filed: October 5, 2012
    Date of Patent: February 24, 2015
    Assignee: L-3 Communications Corp.
    Inventors: David J. Moore, Teren G. Jameson, Dan M. Griffin
  • Patent number: 8964880
    Abstract: In an embodiment of the invention, a frequency divider in a phase-locked loop (PLL) circuit is provided power from the power supply that provides power to a transmission circuit. The PLL is configured to receive a first direct current (DC) reference voltage, a second DC voltage and a reference clock signal. The PLL is configured to generate a transmission clock signal. A transmission circuit is configured to receive the transmission clock signal, the second DC voltage and a data bus where the data bus includes a plurality of data bits in parallel. The transmission circuit transmits data serially.
    Type: Grant
    Filed: July 11, 2012
    Date of Patent: February 24, 2015
    Assignee: Texas Instruments Incorporated
    Inventors: Vishnu Ravinuthula, Dushmantha Rajapaksha, Hugh Mair
  • Patent number: 8964818
    Abstract: A short reach communication system includes a plurality of communication SERDES that communicate data over a short reach channel medium such as a backplane connection (e.g., PCB trace) between, for example, chips located on a common PCB. A multi-level modulated data signal is generated to transmit/receive data over the short reach channel medium. Multi-level modulated data signals, such as four-level PAM, reduce the data signal rate therefore reducing insertion loss, power, complexity of the circuits and required chip real estate.
    Type: Grant
    Filed: January 11, 2013
    Date of Patent: February 24, 2015
    Assignee: Broadcom Corporation
    Inventors: Lorenzo Longo, Vivek Telang
  • Publication number: 20150049845
    Abstract: A method for decoding differentially modulated received symbols, the differentially modulated received symbols corresponding to a transmission of a differentially modulated version of a codeword out of a set of possible codewords, the received symbols being transferred onto resources of a channel, the resources being equally spaced. A receiver, for each possible codeword: obtains a vector of differentially demodulated symbols by differentially demodulating the differentially modulated received symbols obtained by combining two consecutive differentially modulated received symbols; calculates the product of each differentially demodulated symbol by the conjugate of the element of the codeword having the same rank within the codeword as the differentially demodulated received symbol; calculates the sum of the products; decodes the vector of differentially demodulated symbols by selecting the codeword for which the sum of the products is the maximum.
    Type: Application
    Filed: February 25, 2013
    Publication date: February 19, 2015
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Damien Castelain, Cristina Ciochina
  • Publication number: 20150049837
    Abstract: A method and an apparatus for transmitting broadcast signals thereof are disclosed. The apparatus for transmitting broadcast signals comprises an encoder for encoding service data, a mapper for mapping the encoded service data into a plurality of OFDM (Orthogonal Frequency Division Multiplex) symbols to build at least one signal frame, a frequency interleaver for frequency interleaving data in the at least one signal frame by using a different interleaving-seed which is used for every OFDM symbol pair comprised of two sequential OFDM symbols, a modulator for modulating the frequency interleaved data by an OFDM scheme and a transmitter for transmitting the broadcast signals having the modulated data.
    Type: Application
    Filed: August 14, 2014
    Publication date: February 19, 2015
    Inventors: Jongseob BAEK, Jaehyung KIM, Woosuk KO, Sungryong HONG
  • Publication number: 20150049838
    Abstract: 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.
    Type: Application
    Filed: November 3, 2014
    Publication date: February 19, 2015
    Applicant: Sony Corporation
    Inventors: Samuel Asanbeng ATUNGSIRI, Matthew Paul Athol Taylor, John Nicholas Wilson
  • Publication number: 20150049830
    Abstract: The present invention provides a method for performing channel estimation and detection in a Multiple-Input-Multiple-Output (MIMO) system, including: generating a demodulation reference signal, DM-RS, pattern for an extended cyclic prefix (CP); and estimating and detecting channel performance based on the generated DM-RS signal pattern. The DM-RS pattern supports from rank 1 to rank 8 patterns for 8 layer transmission. A transmitter, a receiver and a system thereof are also provided. The solution of the present invention improves channel estimation accuracy, saves channel estimation implementation and implementation complexity at terminals.
    Type: Application
    Filed: October 22, 2014
    Publication date: February 19, 2015
    Inventors: Yang HU, David ASTELY, Xinghua SONG, Jianfeng WANG
  • Patent number: 8958464
    Abstract: A method of powerline communications (PLC) includes compiling a data frame for physical layer (PHY) by a first communications device at a first communications node on a powerline of a PLC network. The data frame includes a single tone PHY header portion and a data payload portion in a set of tones including at least one tone having a frequency different from a frequency of the single tone. The PHY header portion includes tone mask identification information identifying the set of tones. The first communications device transmits the data frame over the powerline to a second communications device at a second communications node on the powerline. The second communications device receives the data frame, and decodes the data payload using the tone mask identification information in the PHY header portion.
    Type: Grant
    Filed: June 11, 2012
    Date of Patent: February 17, 2015
    Assignee: Texas Instruments Incorporated
    Inventors: Ramanuja Vedantham, Anand G. Dabak, Tarkesh Pande, Il Han Kim, Kumaran Vijayasankar
  • Patent number: 8958505
    Abstract: The present invention is directed to reduction of operation amount of likelihood calculation (LLR calculation) in a communication apparatus for performing communications using an extended mapping in which a plurality of bit sequences are assigned to a single symbol point. A receiving unit receives a signal which is transmitted from a transmitting unit by using the extended mapping. A repetition process unit decodes the received signal from the receiving unit by calculating an LLR of the received signal and performing a repetition process. In this case, the LLR is calculated for every bit using a MAX-LOG approximation and a thus-derived approximation formula is multiplied by weighting factors corresponding to proportions of “0” and “1” in each bit assigned to a symbol point closest to the received signal.
    Type: Grant
    Filed: July 26, 2013
    Date of Patent: February 17, 2015
    Assignee: Hitachi Kokusai Electric Inc.
    Inventors: Satoru Ejima, Takehiko Kobayashi, Keat Beng Toh
  • Patent number: 8958499
    Abstract: Techniques for transmitting data over a communications channel are generally described. A value of a property of an inverse of a channel matrix corresponding to the communications channel may be calculated and compared to a threshold value. If the value of the property a first one of greater than or less than the threshold value, at least one transmit message may be altered using a vector perturbation technique to generate data symbols and the data symbols may be precoded using a channel inversion technique to generate precoded data symbols. If the value of the property is the other of greater than or less than the threshold value, the at least one transmit message may be precoded using a channel inversion technique to generate precoded data symbols.
    Type: Grant
    Filed: July 16, 2010
    Date of Patent: February 17, 2015
    Assignee: The Board of Regents of the University of Texas System
    Inventors: Robert W. Heath, Jr., Takao Inoue
  • Publication number: 20150043682
    Abstract: A method of determining a threshold for symbol detection, includes receiving a most previously input sample value and a result of detecting a most previous symbol, and determining the threshold for the symbol detection of a currently input sample value based on the most previously input sample value and the result of detecting the most previous symbol.
    Type: Application
    Filed: May 19, 2014
    Publication date: February 12, 2015
    Applicant: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Joon Seong KANG, Chang Soon PARK, Young Jun HONG
  • Publication number: 20150043681
    Abstract: A circuit includes: a first circuit stage configured to sample a differential input signal at a first logic state of a sampling clock and regenerate the sampled differential input signal at a second logic state of the sampling clock to output a first regenerated differential signal; a second circuit stage configured to amplify the first regenerated differential signal at the second logic state of the sampling clock to output an amplified differential signal; and a third circuit stage configured to regenerate the amplified differential signal at the first logic state of the sampling clock to output a second regenerated differential signal.
    Type: Application
    Filed: August 6, 2013
    Publication date: February 12, 2015
    Applicant: STMICROELECTRONICS INTERNATIONAL N.V.
    Inventor: Sajal Kumar Mandal
  • Publication number: 20150043683
    Abstract: GI removers b102-nR remove a GI from received signals. FFT units b103-nR apply a time-to-frequency transform to the signals obtained in the GI removers b102-nR. Demapping units b104-nR separate from the obtained frequency-domain signals the received signals of resource elements in which data, a first pilot symbol, and a second pilot symbol were respectively transmitted. Path extractors b105-nR use the first pilot symbol to extract effective paths for estimation. Channel estimators b106-nR compute first CFR estimation values using the second pilot symbol, compute CIR estimation values by using path location information extracted by the path extractors and the first CFR estimation values, and then convert the CIR estimation values into second CFR estimation values.
    Type: Application
    Filed: February 7, 2013
    Publication date: February 12, 2015
    Inventors: Katsuya Kato, Takashi Yoshimoto, Ryota Yamada, Kozue Yokomakura
  • Patent number: 8953719
    Abstract: There is provided a signal detector which includes a correlation emphasis unit configured to generate correlation emphasis signals corresponding to the respective fixed intervals, an autocorrelation matrix generation unit configured to generate an autocorrelation matrix, a noise power estimation unit configured to estimate noise power in the correlation emphasis signals, a noise power matrix generation unit configured to generate, a noise power matrix having noise power components, a noise removal unit configured to remove an influence of noise from the autocorrelation matrix, an eigenvalue calculation unit configured to calculate an eigenvalue of the autocorrelation matrix from which the influence of noise has been removed by the noise removal unit, and a signal judgment unit configured to determine whether a signal transmitted from an external apparatus is included in the received signals.
    Type: Grant
    Filed: January 3, 2013
    Date of Patent: February 10, 2015
    Assignee: Fujitsu Limited
    Inventor: Kazuyuki Ozaki
  • Patent number: 8953657
    Abstract: There are several exemplary ways to more efficiently communicate an out-of-domain seed to a receiver—in a first technique, the seed can be indicated in the header portion or data portion of a packet. For example, the header portion of the packet could contain one or more bit fields that indicate the value of the LFSR seed used for the preamble portion of the packet. The receiver would learn the out-of-domain seed after receiving a first out-of-domain packet and decoding the header portion of that packet. After learning the out-of-domain seed, the receiver could send a packet indicating the value of the out-of-domain seed to the local master. The local master could then transmit the value of the out-of-domain seed in the header portion or data portion of a local MAP frame.
    Type: Grant
    Filed: April 23, 2014
    Date of Patent: February 10, 2015
    Assignee: Aware, Inc.
    Inventors: Marcos C. Tzannes, Joon Bae Kim, Stuart Sandberg
  • Patent number: 8953720
    Abstract: In a method for detecting a packet type of an orthogonal frequency division multiplexing (OFDM) data unit detected in a communication channel, a first estimate and a second estimate of a transmitted symbol are determined for each of at least some of a plurality of OFDM tones in an OFDM symbol of the data unit. A first distance and a second distance are determined between a received symbol and, respectively, the first estimate and the second estimate scaled by a channel response estimate corresponding to the OFDM tone. A first total distance is determined based on a mathematical summation of the first distances over the plurality of OFDM tones. A second total distance is determined based on a mathematical summation of the second distances over the plurality of OFDM tones. The packet type is determined based at least on the first total distance and the second total distance.
    Type: Grant
    Filed: January 22, 2013
    Date of Patent: February 10, 2015
    Assignee: Marvell International Ltd.
    Inventors: Arul Durai Murugan Palanivelu, Sudhir Srinivasa, Hongyuan Zhang, Rohit U. Nabar
  • Patent number: 8953727
    Abstract: An apparatus and a method for detecting signals are provided. The method for detecting signals in a receiving end having a plurality of antenna in wireless communication system includes performing Minimum Mean Square Error (MMSE) estimation for a transmitted symbol vector, determining a covariance matrix for the MMSE estimation, determining a triangular matrix based on the covariance matrix, and determining accumulated metrics for each symbol vector candidate based on the triangular matrix.
    Type: Grant
    Filed: January 9, 2013
    Date of Patent: February 10, 2015
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Bakulin Mihail Germanovich, Rog Andrey Leonidovich, Chernysh Alexander Victorovich, Kreyndelin Vitaliy Borisovich
  • Patent number: 8952838
    Abstract: A time domain switching analog-to-digital converter apparatus and methods of utilizing the same. In one implementation, the converter apparatus comprises a carrier signal source, and at least one reference source. The carrier signal is summed with the input signal and the summed modulated signal is fed to a comparator circuit. The comparator is configured detects crossings of the reference level by the modulated waveform thereby generating trigger events. The time period between consecutive trigger events is used to obtain modulated signal deviation due to the input signal thus enabling input signal measurement. Control of the carrier oscillation amplitude and frequency enables real time adjustment of the converter dynamic range and resolution. The use of additional reference signal levels increases sensor frequency response and accuracy. A dual channel converter apparatus enables estimation and removal of common mode noise, thereby improving signal conversion accuracy.
    Type: Grant
    Filed: August 17, 2012
    Date of Patent: February 10, 2015
    Assignee: Lumedyne Technologies, Inc.
    Inventors: Richard Waters, Brad Chisum, Mark Fralick, John D. Jacobs, Ricardo Dao, David Carbonari, Jacques Leveille
  • Patent number: 8952836
    Abstract: A pipeline analog-to-digital converter is disclosed which includes at least one periodic unit consisting of two adjacent stages that jointly use two capacitor networks of the same structure. Each of the capacitor networks includes two identical capacitors, two switches and four terminals. On/off states of the switches and interconnection configuration of the terminals are controlled by clock signals to switch the periodic unit between four possible connection configurations. During operation of the periodic unit, when the upstream stage is in a sampling phase that involves one of the capacitor networks as well as a reference capacitor, the downstream stage uses the other of the capacitor networks to conduct residue amplification; and on the other hand, when the upstream stage is using one of the capacitor networks for residue amplification, the downstream stage relies also on this capacitor network for sampling, leaving the other of the capacitor networks idle.
    Type: Grant
    Filed: April 16, 2014
    Date of Patent: February 10, 2015
    Assignee: Shanghai Huahong Grace Semiconductor Manufacturing Corporation
    Inventors: Hongwei Zhu, Yuwei Zhao
  • Patent number: 8953718
    Abstract: A receiver assembly for the wireless reception of data that are modulated onto a carrier signal includes an analog receiver, an evaluating device and a control device. The control device controls the receiver by means of sampling pulses such that the receiver is activated during the sampling pulses and is ready to receive transmission signals and is deactivated during the sampling pauses. The evaluating device generates a data bit sequence from the received signals that are supplied by the receiver during the sampling pulses. The control device is further designed to actuate the receiver between phases having differing sampling frequency ranges in dependence on at least one predefined switching criterion.
    Type: Grant
    Filed: July 8, 2011
    Date of Patent: February 10, 2015
    Assignee: Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V.
    Inventors: Frank Oehler, Heinrich Milosiu
  • Publication number: 20150036771
    Abstract: Embodiments of the present invention provide a device and method for communication correction. The device includes a receiving channel and a correction channel, where the receiving channel includes an analogue radio-frequency front end, a demodulator, a first analogue-to-digital converter, and a first channel correction module that are connected sequentially, and the correction channel includes a frequency converter, a second analogue-to-digital converter, and a digital processor that are connected sequentially, where the analogue radio-frequency front end is further connected to the frequency converter, and the digital processor is connected to the first channel correction module. With the technical solutions of the present invention, channel correction is performed on the receiving channel by the correction channel, so as to improve the precision of receiving a radio signal.
    Type: Application
    Filed: October 17, 2014
    Publication date: February 5, 2015
    Applicant: HUAWEI TECHNOLOGIES CO., LTD.
    Inventors: Xingwen LI, Li XIAN, Tingzhao LI, Lihong JIANG
  • Publication number: 20150036770
    Abstract: According to one embodiment, a reception apparatus is configured to receive a radio signal comprising a plurality of modulated subcarriers. The reception apparatus has a demodulator, a subcarrier specification module, and an error correction decoder. The demodulator is configured to demodulate the radio signal to generate the subcarriers. The subcarrier specification module is configured to specify a subcarrier whose frequency overlaps with a spurious frequency among the subcarriers. The error correction decoder is configured to perform error correction, relying more on the subcarriers whose frequencies do not overlap with the spurious frequency than on the subcarrier whose frequency overlaps with the spurious frequency.
    Type: Application
    Filed: February 3, 2014
    Publication date: February 5, 2015
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Koji Horisaki, Toshiyuki Yamagishi
  • Patent number: 8948316
    Abstract: Upstream frequency response measurement and characterization. Signaling is provided between respective communication devices within a communication system. Based upon at least one of these signals, one of the communication devices captures a number of sample sets corresponding thereto at different respective frequencies (e.g., a different respective center frequencies, frequency bands, etc.). Then, spectral analysis is performed with respect to each of the sample sets to generate a respective and corresponding channel response estimate there from. After this number of channel response estimates is determined, they are combined or splice together to generate a full channel response estimate. In implementations including an equalizer, different respective sample sets may correspond to those that have undergone equalization processing and those that have not.
    Type: Grant
    Filed: March 23, 2012
    Date of Patent: February 3, 2015
    Assignee: Broadcom Corporation
    Inventors: Bruce J. Currivan, Thomas J. Kolze, Jonathan S. Min, Victor T. Hou
  • Patent number: 8948317
    Abstract: A receiver apparatus includes a channel estimator (b106) to perform channel estimation. The channel estimator includes an interim channel impulse estimating unit (b106-1) that calculates an interim channel impulse response estimation value, a path extracting unit (b106-3) that extracts a path for use in calculation of a channel impulse response estimation value from among paths forming the interim channel impulse response estimation values, a channel impulse response estimating unit (b106-4) that calculates the channel impulse response estimation value using the path extracted by the path extracting unit, and a frequency response estimating unit (b106-5) that converts the channel impulse response estimation value into a frequency response estimation value by time-frequency transforming the channel impulse response estimation value. In this way, a receiver apparatus capable of performing accurate channel estimation results.
    Type: Grant
    Filed: January 13, 2012
    Date of Patent: February 3, 2015
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Katsuya Kato, Takashi Yoshimoto, Ryota Yamada
  • Patent number: 8948285
    Abstract: A communications system including a transmitter and a receiver. The transmitter transmits a signal with normal data symbols and at least one dual-use data symbol, where the dual-use data symbol has user data and more data protection than the normal data symbols. The receiver receives the transmitted signal and decodes the dual-use data symbol and uses information from decoding of the dual-use data symbol to improve a channel estimate for the normal data symbols.
    Type: Grant
    Filed: February 27, 2013
    Date of Patent: February 3, 2015
    Assignees: GM Global Technology Operations LLC, Carnegie Mellon University
    Inventors: Zheng Li, Fan Bai, Vijayakumar Bhagavatula
  • Patent number: 8948315
    Abstract: A OFDM digital communication receiver having channel estimate and correction means and inter carrier interference cancellation means based on the use of a temporal digital filter comprising a set of digital coefficients. The receiver includes n Look-Up Tables LUT(n), each corresponding to a given set of digital coefficients and an entry pointer.
    Type: Grant
    Filed: October 20, 2009
    Date of Patent: February 3, 2015
    Assignee: STMicroelectronics International N.V.
    Inventor: Christophe Del-Toso
  • Patent number: 8948156
    Abstract: A mobile device coupled to a common system clock receives a signal comprising a primary synchronization sequence (PSS) and a secondary synchronization sequence (SSS) in a radio frame. Sample counts are generated for timed events based on corresponding operating bandwidths. The timed events are detected at modulo sample counts of the generated sample counts according to corresponding operating bandwidths. PSS symbol timing determined via the PSS synchronization is aligned to the generated sample counts based on corresponding operating bandwidth. The generated sample counts are bit-shifted relative to the aligned PSS symbol timing for other timed events based on corresponding operating bandwidths. The one or more timed events are determined via performing modulo counting after the bit-shifting. Timing operations are performed at the determined timed events and the determined one or more timed events are refined, accordingly.
    Type: Grant
    Filed: May 25, 2012
    Date of Patent: February 3, 2015
    Assignee: Broadcom Corporation
    Inventors: Francis Swarts, Mark Kent