Matched-filter-type Receiver Patents (Class 375/152)
  • Patent number: 11785600
    Abstract: When a plurality of terminals share the same resources in a wireless communication system, and when control information such as acknowledgement/negative acknowledgement (ACK/NAK) information or scheduling information is transmitted, a method of efficiently performing code division multiplexing (CDM) is required to distinguish the plurality of terminals. In particular, it is necessary to develop a method by which a code sequence of CDM can be selected and used according to each cell condition. Provided is a method of forming a signal in a wireless communication system in which a plurality of terminals commonly share frequency and time resources. The method includes the operations of receiving condition information in a cell; selecting one of a plurality of time domain orthogonal sequences having different lengths, according to the condition information; and allocating the selected time domain orthogonal sequence to a control signal symbol block.
    Type: Grant
    Filed: February 6, 2021
    Date of Patent: October 10, 2023
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Young-Jo Ko, Hyeong-Geun Park, Il-Gyu Kim, Kapseok Chang, Hyoseok Yi, Young-Hoon Kim, Seung-Chan Bang
  • Patent number: 11563619
    Abstract: An operating method for an electronic device and a signal processor included in the electronic device are provided. The operating method for an electronic device comprises a descrambling a synchronization signal received from a cell, acquiring a time domain average signal on the descrambled synchronization signal, executing a differential correlation on the time domain average signal by a predetermined reference, and measuring a power of the synchronization signal provided from the cell, using the differential.
    Type: Grant
    Filed: January 22, 2020
    Date of Patent: January 24, 2023
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Hae Chul Lee
  • Patent number: 11522576
    Abstract: A method for estimating a time of arrival of a signal transmitted over a wireless channel, includes receiving the signal by a receiving device; correlating the received signal with a filtered code sequence to create a correlation output, identifying in the correlation output, an observation window associated with a main lobe in the correlation output; and processing the observation window to determine a time of arrival of a first path component in the received signal. The filtered code sequence is formed by incorporating a time of arrival matched filter (TOA-MF) inside predetermined shaped code sequence. The TOA-MF is matched to the predetermined shaped code sequence and is based upon a power delay profile of the wireless channel. The predetermined shaped code sequence is a convolution of a predetermined shaping sequence and a predetermined code sequence.
    Type: Grant
    Filed: November 19, 2020
    Date of Patent: December 6, 2022
    Assignee: Nestwave SAS
    Inventor: Rabih Chrabieh
  • Patent number: 11516221
    Abstract: A device implementing a system for responding to a voice request includes a processor configured to receive a voice request, the device being associated with a user account, and determine, based on the voice request, a confidence score that the voice request corresponds to a voice profile associated with the user account. The processor is further configured to select, based at least in part on a content of the voice request and the confidence score, a request domain from among plural request domains for responding to the voice request, and provide for a response to the voice request based on the selected request domain.
    Type: Grant
    Filed: May 18, 2020
    Date of Patent: November 29, 2022
    Assignee: Apple Inc.
    Inventor: Thomas Alsina
  • Patent number: 11474185
    Abstract: A directional receiver system may include a receiver, a plurality of receive antenna elements, and a circuit. The receiver may include an input port and an output. The plurality of receive antenna elements may be fixedly configured into a known geometric relationship to each other, and each of the receive antenna elements may be connected to the input port of the receiver. The circuit may be coupled to the output of the receiver, configured to determine time differences at which signals from a source are incident upon the antenna elements, and configured to determine an angular orientation of the source to the receive antenna elements based on the time differences.
    Type: Grant
    Filed: July 24, 2020
    Date of Patent: October 18, 2022
    Inventor: Gregory Dean Gibbons
  • Patent number: 11101932
    Abstract: A method of transmitting a block of data from a transmitter entity to a receiver entity in a wireless telecommunication system. The method includes: establishing a plurality of different redundancy versions for the block of data; transmitting the plurality of different redundancy versions for the block of data in a first sequence order in a first time period; and transmitting the plurality of different redundancy versions for the block of data in a second sequence order in a second time period, wherein the second sequence order is different form the first sequence order.
    Type: Grant
    Filed: November 7, 2016
    Date of Patent: August 24, 2021
    Assignee: SONY CORPORATION
    Inventors: Martin Warwick Beale, Shin Horng Wong
  • Patent number: 10623222
    Abstract: Techniques related to a data processing engine for an integrated circuit (IC) are described. In an example, a method is provided for vectorized peak detection. The method includes dividing a set of data samples of a data signal, corresponding to a peak detection window (PDW), into a plurality of subsets of data samples each comprising a number of data samples. The method includes performing vector operations on each of the plurality of subsets of data samples. The method includes determining a running index of a sample with a maximum amplitude over the PDW based on the vector operations.
    Type: Grant
    Filed: August 30, 2018
    Date of Patent: April 14, 2020
    Assignee: XILINX, INC.
    Inventors: Kaushik Barman, Parag Dighe, Baris Ozgul, Sneha Bhalchandra Date
  • Patent number: 10466345
    Abstract: An interface circuit in an electronic device may receive samples of wireless signals in a time interval, where the wireless signals are associated with the second electronic device. Then, the interface circuit may generate, based at least in part on the samples, pseudospectra corresponding to eigenfilters associated with eigenvectors of a signal spectrum, where the pseudospectra correspond to a set of times of arrival of the samples. Moreover, for a given peak in the pseudospectra, the interface circuit may determine an associated number of additional peaks within a temporal bin that includes the given peak, where the given peak is associated with one of the set of times of arrival. Next, the interface circuit may select a subset of the peaks having a top-N numbers of additional peaks, where N is an integer. Furthermore, the interface circuit may select lower time of arrival for the subset of the peaks.
    Type: Grant
    Filed: March 6, 2018
    Date of Patent: November 5, 2019
    Assignee: Apple Inc.
    Inventor: Konstantinos Sarrigeorgidis
  • Patent number: 10356788
    Abstract: Higher rates of data communication may be utilized for downlink than for uplink. However, the decoding complexity of Sparse Code Multiple Access (SCMA) may become prohibitive for very high rates, resulting from, for example, a large number of layers, for very large constellations, or a combination of the two. Methods and transmitters are provided herein for transmitting that has been generated to reduce complexity at the receiver and methods and receivers are provided herein for receiving and decoding a received signal with reduced complexity. The reduced complexity in part is provided by the ability to maintain real and imaginary parts of a transmitted signal independent from one another.
    Type: Grant
    Filed: November 30, 2016
    Date of Patent: July 16, 2019
    Assignee: HUAWEI TECHNOLOGIES CO., LTD.
    Inventors: Mahmoud Taherzadeh Boroujeni, Alireza Bayesteh
  • Patent number: 10305526
    Abstract: In order to improve accuracy in estimating a transmission line that includes a delay path having a long delay time, the present invention provides a wireless reception device that includes a transmission estimation unit including: a delay profile generation unit that estimates a transmission line from a reference signal portion by using a known reference signal replica, and that calculates a delay profile from a transmission line estimation result; a path detection unit that detects a position of a sample, which is included in the delay profile, as a path position; a delay profile division unit that divides the delay profile based on the path position; and a transmission line calculation unit that calculates a transmission line per path by carrying out averaging to the delay profile per path in the frequency domain, and that combines transmission line calculation results per path.
    Type: Grant
    Filed: January 11, 2018
    Date of Patent: May 28, 2019
    Assignee: NEC CORPORATION
    Inventor: Shota Kubo
  • Patent number: 10004052
    Abstract: Disclosed is an apparatus and method for estimating a Doppler shift for underwater communication. The apparatus includes: a multipath delay profile determiner for detecting a correlation of a known signal 1 and a received packet signal and time (T1o) at a point having maximum energy of the correlation, and detecting a multipath delay profile at the time (T1o); a correlation calculator for calculating a correlation between a correlation of a known signal 2 and the received packet signal, and the multipath delay profile; a maximum value detector for detecting time (T2o) at a point having maximum energy of the correlation calculated by the correlation calculator; and a Doppler shift estimator for determining a Doppler shift using a difference between the time (T1o) and the time (T2o) at points having respective maximum energy.
    Type: Grant
    Filed: December 28, 2015
    Date of Patent: June 19, 2018
    Assignee: KOREA INSTITUTE OF OCEAN SCIENCE AND TECHNOLOGY
    Inventors: Seung-Guen Kim, Yong-Kon Lim, Sea-Moon Kim, Jong-Won Park, Changho Yun
  • Patent number: 9847853
    Abstract: Automatic Repeat Request (ARQ) protocol is used in many modern telecommunication systems for improved link level reliability. Hybrid ARQ (HARQ) protocol takes advantage of the retransmissions in ARQ to enable the receiver to decode the currently received data by combining it with all the previously received transmissions that were not successfully decoded. Each successive retransmission improves the probability of correctly decoding the data. To support HARQ, the receiver is required to store the previously received unsuccessful transmissions for combining with future retransmissions. The storage of the previously received unsuccessful transmissions can be very large depending on type of the HARQ protocol used. A method and apparatus are disclosed that enable reduced memory storage requirements while maintaining the HARQ performance requirements. The reduced memory requirements result in reduced cost, reduced power consumption and lowered cost.
    Type: Grant
    Filed: January 28, 2016
    Date of Patent: December 19, 2017
    Assignee: MBIT WIRELESS, INC.
    Inventor: Bhaskar Patel
  • Patent number: 9654254
    Abstract: A method and a device for reducing a bit error rate in a Code Division Multiple Access (CDMA) communication system are described, wherein this method includes: a sample sequence Iin of an in-phase component signal I, and a sample sequence Qin of a quadrature component signal Q are obtained, and the signals are sent by a signal sending end; the obtained sample sequence Iin and the sample sequence Qin are divided into different groups according to a sample number Ns of a chip, a sum-average operation is performed on a signal in each group, and a corresponding signal group is determined, wherein, the signal group determined by performing the sum-average operation on the sample sequence Iin is WI, the signal group determined by performing the sum-average operation on the sample sequence Qin is WQ; and a signal in the signal group WI and the signal group WQ is grouped to determine a signal belonging to the same chip in the sample sequence which experiences the sum-average operation, and the determined signal is ou
    Type: Grant
    Filed: July 12, 2013
    Date of Patent: May 16, 2017
    Assignee: ZTE CORPORATION
    Inventor: Zhongping Chen
  • Patent number: 9560420
    Abstract: The present invention is an integrated cable modem tuner. In one embodiment, the upstream path and the downstream path are integrated on a common semiconductor substrate. The down-stream path can include a TV tuner and digital receiver portion that is integrated on a common semiconductor substrate with the power amplifier of the upstream path. In another embodiment, the TV tuner is implemented on a first semiconductor substrate and the digital receiver portion and the power amplifier are configured on a second semiconductor substrate. However, the two substrates are mounted on a common carrier so that the cable modem appears to be a single chip configuration to the user.
    Type: Grant
    Filed: November 4, 2013
    Date of Patent: January 31, 2017
    Assignee: Broadcom Corporation
    Inventors: Donald G. McMullin, Lawrence M. Burns, Leonard Dauphinee, Ramon A. Gomez, Loke Tan
  • Patent number: 9454512
    Abstract: A method of generating a correlation function, a method of tracking a signal, and a signal tracking apparatus are provided. The method of generating a correlation function involves receiving a CBOC(6,1,1/11) signal, interpreting a subcarrier pulse period of the CBOC(6,1,1/11) signal as a subcarrier pulse period of BOCsin(6,1), combining partial correlation functions constituting an autocorrelation function of CBOC(6,1,1/11) to generate a correlation function, and weighted-combining the correlation function to generate an unambiguous correlation function.
    Type: Grant
    Filed: May 15, 2014
    Date of Patent: September 27, 2016
    Assignee: RESEARCH & BUSINESS FOUNDATION SUNGKYUNKWAN UNIVERSITY
    Inventors: Keunhong Chae, Seokho Yoon
  • Patent number: 9351319
    Abstract: 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.
    Type: Grant
    Filed: August 19, 2014
    Date of Patent: May 24, 2016
    Assignee: SONY CORPORATION
    Inventors: Yuichi Morioka, Kazuyuki Sakoda, Shinichi Kuroda, Ryo Sawai
  • Patent number: 9270308
    Abstract: The present invention provides an adaptive radio-interference cancelling device and method, a receiver, and a wireless full duplex communication system.
    Type: Grant
    Filed: July 2, 2015
    Date of Patent: February 23, 2016
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Teyan Chen, Yinggang Du, Sheng Liu
  • Patent number: 9258149
    Abstract: A scheme for determining which of a set of taps that can potentially be used to measure a channel impulse response should be used to estimate the channel impulse response.
    Type: Grant
    Filed: September 9, 2005
    Date of Patent: February 9, 2016
    Assignees: MStar Semiconductor, Inc., MStar Software R&D (Shenzhen) Ltd., MStar France SAS, MStar Semiconductor, Inc.
    Inventors: James Chapman, Jason Taylor, Cyril Valadon
  • Patent number: 9244156
    Abstract: A system and method for detecting unknown signals that may be radar pulses is presented. The method includes conjugate multiplying a first signal with a second signal to produce a first multiplied signal and conjugate multiplying the second signal with a third signal to produce a second multiplied signal. The first and second signals are orthogonal and the second and third signals are orthogonal. The radar pulse is contained in all three signals but each signal has noise components. The first multiplied signal is integrated to produce a first integrated signal and the second multiplied signal is integrated to produce a second integrated signal. The first and second integrated signals are summed to produce a summed signal. A location of a peak power of the summed signal is then detected. A TOA of the of the radar pulse is then detected based on the location of the peak power.
    Type: Grant
    Filed: May 29, 2013
    Date of Patent: January 26, 2016
    Assignee: BAE Systems Information and Electronic Systems Integration Inc.
    Inventor: Arthur J. Tardif
  • Patent number: 9148811
    Abstract: Apparatus and method for recognizing Global System for Mobile communication (GSM) signals are provided. The solution comprises obtaining position and timing information from a satellite positioning system; tuning to a frequency channel with GSM transmission; collecting a group of I/Q samples for the length of 12 GSM frames; performing peak detection using at least two peak detectors over the group of samples wherein the found peak values are the locations of synchronization bursts (SCH). For the found peaks, the timing information, carrier-to-noise ratio, in phase and quadrature values are determined. A group of I/Q samples for the length of 12 or 51 GSM frames are collected. From the found SCH, base station identification code BSIC, frame number and Broadcast Control Channel (BCCH) training sequence are determined. BCCHs corresponding to all SCH are decoded; and transmitting base stations identified.
    Type: Grant
    Filed: December 18, 2012
    Date of Patent: September 29, 2015
    Assignee: Anite Finland OY
    Inventor: Steven Thompson
  • Patent number: 9031118
    Abstract: In one embodiment, a correlator of a global positioning system receiver in a global positioning system receives a sample satellite signal. The correlator includes a signal comparator configured to receive the sample signal, a first normalized estimate signal, and a second normalized estimate signal. The signal comparator generates a first accumulated output and a second accumulated output. The first accumulated output represents the integration of a correlation of the sample signal and the first normalized estimate signal. The second accumulated output represents the integration of a correlation of the sample signal and the second normalized estimate signal. Using time-multiplexing, the high speed of a digital signal processing core is leveraged to perform calculations of the signal comparator and threshold comparator in real time.
    Type: Grant
    Filed: May 20, 2013
    Date of Patent: May 12, 2015
    Assignee: Avidyne Corporation
    Inventors: Angelo Joseph, David McCoy
  • Patent number: 9014236
    Abstract: A method for performing joint detection includes adjusting a ranking order of codes in a matched filtering result, and a ranking order of column vectors in a system submatrix according to the power. The joint detection is performed using an adjusted matched filtering result and an adjusted system submatrix, and acquires demodulated signals corresponding to the codes. The codes that have high power will be demodulated first. This ensures accuracy of demodulation, inhibits erroneous propagation effect, and improves accuracy of the joint detection.
    Type: Grant
    Filed: September 28, 2011
    Date of Patent: April 21, 2015
    Assignee: Telefonaktiebolaget L M Ericsson (publ)
    Inventors: Zhixun Tang, Xie Li, Liping Zhang
  • Patent number: 9008195
    Abstract: A technique detects the presence of a packet identification sequence in a received sequence of samples received over a communications network. The packet identification sequence, when present and properly detected in a received packet, is used to determine a particular type of the received packet from a plurality of packet types that may be received over the communications network. The technique for detecting the packet identification sequence includes detecting a null sequence in the received packet and a predetermined identification sequence in the packet. Detection of the predetermined sequence uses energy estimates for corresponding windows of received samples.
    Type: Grant
    Filed: January 9, 2012
    Date of Patent: April 14, 2015
    Assignee: ViXS Systems, Inc.
    Inventors: Cheng-Chou Lan, Cimarron Mittelsteadt
  • Patent number: 9001938
    Abstract: A method of detecting a received signal, includes determining correlation between a received signal in a predetermined signal interval and training symbols, and determining a median absolute deviation (MAD) of the received signal in a predetermined reference interval. The method further includes detecting a presence of the received signal based on the correlation and the MAD.
    Type: Grant
    Filed: August 1, 2013
    Date of Patent: April 7, 2015
    Assignees: Samsung Electronics Co., Ltd., Industry-Academic Cooperation Foundation, Yonsei University
    Inventors: Jong Han Kim, Un Sun Cho, Young Jun Hong, Joon Seong Kang, Jae Seok Kim, Chang Soon Park
  • Patent number: 8995578
    Abstract: A receiver apparatus includes a propagation channel estimating unit that estimates a propagation channel. The propagation channel estimating unit includes a path detector unit that repeatedly performs a process of detecting paths in the order of increase in a propagation channel goodness of fit. The receiver apparatus that estimates a propagation channel at a high accuracy level with a small amount of calculation operation involved is thus provided.
    Type: Grant
    Filed: August 10, 2011
    Date of Patent: March 31, 2015
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Katsuya Kato, Takashi Yoshimoto, Ryota Yamada
  • Patent number: 8948321
    Abstract: A receiver may be operable to receive an inter-symbol correlated (ISC) signal, and generate a plurality of soft decisions as to information carried in the ISC signal. The soft decisions may be generated using a reduced-state sequence estimation (RSSE) process. The RSSE process may be such that the number of symbol survivors retained after each iteration of the RSSE process is less than the maximum likelihood state space. The plurality of soft decisions may comprise a plurality of log likelihood ratios (LLRs). Each of the plurality of LLRs may correspond to a respective one of a plurality of subwords of a forward error correction (FEC) codeword.
    Type: Grant
    Filed: February 24, 2014
    Date of Patent: February 3, 2015
    Assignee: MagnaCom Ltd.
    Inventors: Amir Eliaz, Ilan Reuven
  • Patent number: 8938032
    Abstract: A system for implementing an orthogonal frequency division multiplexing scheme and providing an improved range extension. The system includes a transmitter for transmitting data to a receiver. The transmitter includes a symbol mapper for generating a symbol for each of a plurality of subcarriers and a spreading module for spreading out the symbol on each of the plurality of subcarriers by using a direct sequence spread spectrum. The symbol on each of the plurality of subcarriers is spread by multiplying the symbol by predefined length sequences. The receiver includes a de-spreader module for de-spreading the symbols on each of the plurality of subcarriers. The de-spreader module includes a simple correlator receiver for obtaining maximum detection. The correlator produces an output sequence of a same length as an input sequence and the de-spreader module uses a point of maximum correlation on the output sequence to obtain a recovered symbol.
    Type: Grant
    Filed: January 21, 2013
    Date of Patent: January 20, 2015
    Assignee: Broadcom Corporation
    Inventor: Jason A. Trachewsky
  • Patent number: 8934519
    Abstract: Methods and apparatus are disclosed for receiving a diversity transmitted signal using a Rake or G-Rake receiver in a radio system. Signals are diversity transmitted in a first and second symbol period by two or more antennas. One or more receive antennas receive the diverse transmit signals. Weights are generated to account for the correlation between the channels over which the diverse transmit signals are transmitted in the first and second symbol period and are used to weight the received signals. The weighted signals are then fed to a mutual receiver.
    Type: Grant
    Filed: December 14, 2007
    Date of Patent: January 13, 2015
    Assignee: Telefonaktiebolaget LM Ericsson (Publ)
    Inventors: Qingyu Miao, Hai Wang
  • Patent number: 8934522
    Abstract: An integrated circuit for facilitating spread spectrum reception of data having a data bit period includes an hypothesis search circuit (120, 210, 220) operable to correlate a pseudorandom code with a signal input based on a received signal to produce correlation results, and a processor circuit (320) operable to coherently integrate the correlation results over plural sample windows (PreD1, PreD2) staggered relative to each other in the coherent integration interval and to non-coherently combine the coherently integrated results corresponding to the plural sample windows (PreD1, PreD2) to produce a received signal output, whereby enhancing performance. Other circuits, receivers and processes are also disclosed.
    Type: Grant
    Filed: May 25, 2012
    Date of Patent: January 13, 2015
    Assignee: Texas Instruments Incorporated
    Inventors: Sunil Chomal, Karthik Ramasubramanian, Jawaharlal Tangudu, Hemanth Mullur
  • Patent number: 8917756
    Abstract: A wireless communication system. The system comprises transmitter circuitry (BST1), the transmitter circuitry comprising encoder circuitry (50) for transmitting a plurality of frames (FR). Each of the plurality of frames comprises a primary synchronization code (PCS) and a second synchronization code (SSC). The encoder circuitry comprises of circuitry (501) for providing the primary synchronization code in response to a first sequence (32). The encoder circuitry further comprises circuitry (502) for providing the secondary synchronization code in response to a second sequence (54) and a third sequence (56). The second sequence is selected from a plurality of sequences. Each of the plurality of sequences is orthogonal with respect to all other sequences. The third sequence is a subset of bits from the first sequence.
    Type: Grant
    Filed: February 23, 2012
    Date of Patent: December 23, 2014
    Assignee: Texas Instruments Incorporated
    Inventors: Anand G. Dabak, Sundararajan Sriram, Srinath Hosur
  • Patent number: 8913100
    Abstract: A mobile device, and a method and computer program product for displaying a streaming video image at the mobile device during a packet based video call via a channel established over a wireless communication network, the method includes receiving a speed indication of the mobile device and sending said indication to a communication client application; and responsive to receiving said indication, the communication client application is configured to limit the amount of information in the streaming video image that is supplied for display on a display of the mobile device during the video call when the speed of the mobile device is greater than, or equal to, a first predetermined speed threshold.
    Type: Grant
    Filed: December 30, 2011
    Date of Patent: December 16, 2014
    Assignee: Skype
    Inventor: Sten Tamkivi
  • Patent number: 8908745
    Abstract: The present invention provides a transmission system, including: a transmitter including a transmitter filter; a receiver including a receiver filter; and a communicative coupling between the transmitter and the receiver; wherein the transmitter filter and the receiver filter are matched for noise reduction, and wherein the combined responses of the transmitter filter and the receiver filter satisfy the Nyquist criteria. Optionally, the transmitter filter includes a pulse shaping quasi digital finite impulse response filter. Optionally, the receiver filter includes an inductor-capacitor ladder based filter.
    Type: Grant
    Filed: January 18, 2011
    Date of Patent: December 9, 2014
    Assignee: Ciena Corporation
    Inventors: Vladimir Pelekhaty, Michael Y. Frankel, Michael J. Wingrove
  • Patent number: 8891696
    Abstract: A wireless sensor with fast correlator to detect a known pattern. The wireless sensor with fast correlator comprises a wireless receiver with bank of detectors and bank of correlators, a receive signal strength measurement circuit, and a control processor with timing counter. The fast correlator comprises of a shift register, an array of ENXOs gates, an array of AND gates and Delays and a final AND gate. The control processor utilizes the received information, received signal strength and timing information to estimate and calculate various environmental parameters which can be used to activate different devices.
    Type: Grant
    Filed: January 25, 2013
    Date of Patent: November 18, 2014
    Assignee: Kiomars Anvari
    Inventor: Kiomars Anvari
  • Patent number: 8891591
    Abstract: A receiver circuit includes an estimation unit configured to estimate a noise power of a transmission channel, a calculation unit configured to calculate a decision variable based on the noise power, and a decision unit configured to make a ternary decision based on the decision variable.
    Type: Grant
    Filed: June 27, 2011
    Date of Patent: November 18, 2014
    Assignee: Intel Mobile Communications GmbH
    Inventors: Rajarajan Balraj, Thorsten Clevorn, Herbert Dawid
  • Patent number: 8879679
    Abstract: A method and system provide frequency offset compensation in a wireless communication device. A frequency offset compensation module (FOCM) correlates a received reference signal with sub-replica reference sequences to obtain a vector of matched filter output values associated with a time offset identified by a correlation time index value. The FOCM determines a correlation score vector using a combined energy associated with matched filter output values. The FOCM then determines a first phase difference based on matched filter output values corresponding to adjacent sub-replica sequences. The FOCM computes a second phase difference by linearly combining a selected first phase difference and at least one neighbor first phase difference having a second correlation time index value that differs from a first correlation time index value of the selected first phase difference. The FOCM uses the second phase difference to provide compensation for a frequency offset associated with received signals.
    Type: Grant
    Filed: August 27, 2012
    Date of Patent: November 4, 2014
    Assignee: Motorola Mobility LLC
    Inventor: Chris T. Quanbeck
  • Patent number: 8879675
    Abstract: A synchronization system for initial setup of phases of local oscillators in a wireless receiver of a communication system characterized by transmission of data packets having a predetermined preamble consisting of M identical sections of L symbols followed by a single section of the same kind, multiplied by ?1, and wherein the wireless receiver is operative to perform decimation in an RF demodulator. The synchronization system includes a twofold correlator, an accumulator, a multiplier, a threshold comparator, a carrier phase former and a clock phase former, and operates at a decimated symbols frequency, and performs not only preamble detection, but also symbols clock phase detection together with carrier phase detection, while enabling the theoretically possible noise immunity.
    Type: Grant
    Filed: May 21, 2014
    Date of Patent: November 4, 2014
    Assignee: Guzik Technical Enterprises
    Inventors: Anatoli B. Stein, Semen P. Velfbeyn
  • Patent number: 8873651
    Abstract: An OFDM generation apparatus and methods for generating OFDM transmission signals from OFDM symbols, each including a plurality of OFDM subcarriers, for transmission in a multi-carrier data transmission system, is provided. The provided apparatus and method may use a selected mixing frequency for mixing complex time-domain samples of OFDM symbols from a baseband frequency up to a passband frequency to obtain OFDM transmission signals, wherein the mixing frequency is selected such that common phase rotations of the OFDM subcarriers of OFDM symbols with respect to adjacent OFDM symbols of the OFDM transmission signals are avoided or compensated after the mixing. Additional apparatuses and methods for avoidance or compensation of such common phase rotations are also provided.
    Type: Grant
    Filed: January 12, 2011
    Date of Patent: October 28, 2014
    Assignee: Sony Corporation
    Inventors: Nabil Muhammad, Lothar Stadelmeier, Joerg Robert
  • Patent number: 8848671
    Abstract: A mobile device that operates in a wireless communication network is disclosed. The mobile device includes a transceiver that uses a first wireless communication technology, which can be Long Term Evolution (LTE) technology. The mobile device also includes a modem that coupled to the transceiver through a standard interface and uses a second wireless communication technology, which can be CDMA. The modem processes the received signal from the transceiver and processes a transmit signal for the transceiver. A first receiver first processing circuit has a matching filter to compensate for and resampling the received signal from the receiver so that that the received signal from the transceiver is compatible with the modem. A transmitter processing has a filter for resampling and adjusting a processed transmit signal for the transmitter.
    Type: Grant
    Filed: August 9, 2011
    Date of Patent: September 30, 2014
    Assignee: Motorola Mobility LLC
    Inventors: Dale G. Schwent, Gregory W. Chance, Armin W. Klomsdorf
  • Publication number: 20140269851
    Abstract: Systems, devices, and methods to improve signal detection of a receiver in communication systems, including receiving a signal having one or more distorted versions of a predetermined waveform as well as processing the received signal with a plurality of eigenfilters generated from eigenvectors of a covariance matrix of the predetermined waveform. Further a correlation output is generated by further processing the received signal with at least one matched filter formed from an eigenfiltered version of the predetermined waveform and identifying at least one peak in the correlator output. The peak may be used to improve performance of the receiver.
    Type: Application
    Filed: March 15, 2013
    Publication date: September 18, 2014
    Applicant: MOTOROLA SOLUTIONS, INC.
    Inventors: YADUNANDANA N. RAO, RaviTeja Chinta, Daniel A. Tealdi
  • Patent number: 8837557
    Abstract: Techniques for use in sampling a signal of a receiver are described. In a sampling determination mode, a signal is sampled at a first sampling period for producing a sample set for each phase of the sampled signal. For each sample set, a correlation process is performed for producing a correlation result. One of the phases associated with an optimal correlation result is identified from the correlation results. In a communication mode, a received signal is sampled at a second sampling period at the phase associated with the optimal correlation result, for recovering user or signaling information from the received signal. The second sampling period is less than the first sampling period.
    Type: Grant
    Filed: December 10, 2012
    Date of Patent: September 16, 2014
    Assignee: BlackBerry Limited
    Inventor: Xin Jin
  • Patent number: 8836557
    Abstract: A method for signal processing includes accepting an analog signal, which consists of a sequence of pulses confined to a finite time interval. The analog signal is sampled at a sampling rate that is lower than a Nyquist rate of the analog signal and with samples taken at sample times that are independent of respective pulse shapes of the pulses and respective time positions of the pulses in the time interval. The sampled analog signal is processed.
    Type: Grant
    Filed: October 5, 2011
    Date of Patent: September 16, 2014
    Assignee: Technion Research & Development Foundation Ltd.
    Inventors: Yonina Eldar, Ewa Matusiak
  • Patent number: 8837558
    Abstract: Systems, devices, and methods to improve signal detection of a receiver in communication systems, including receiving a signal having one or more distorted versions of a predetermined waveform as well as processing the received signal with a plurality of eigenfilters generated from eigenvectors of a covariance matrix of the predetermined waveform. Further a correlation output is generated by further processing the received signal with at least one matched filter formed from an eigenfiltered version of the predetermined waveform and identifying at least one peak in the correlator output. The peak may be used to improve performance of the receiver.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: September 16, 2014
    Assignee: Motorola Solutions, Inc.
    Inventors: Yadunandana N. Rao, RaviTeja Chinta, Daniel A. Tealdi
  • Publication number: 20140241403
    Abstract: A method for performing joint detection includes adjusting a ranking order of codes in a matched filtering result, and a ranking order of column vectors in a system submatrix according to the power. The joint detection is performed using an adjusted matched filtering result and an adjusted system submatrix, and acquires demodulated signals corresponding to the codes. The codes that have high power will be demodulated first. This ensures accuracy of demodulation, inhibits erroneous propagation effect, and improves accuracy of the joint detection.
    Type: Application
    Filed: September 28, 2011
    Publication date: August 28, 2014
    Applicant: ERICSSON MODEMS SA
    Inventors: Zhixun Tang, Xie Li, Liping Zhang
  • Patent number: 8811454
    Abstract: Provided are a method for dynamically acquiring a PN synchronization of a blink signal in a reader according to a channel state when a tag transmits a direct sequence spread spectrum (DSSS) blink signal having a predetermined period and the reader receives the blink signal in a 2.4 GHz RTLS system which complies with an ISO/IEC24730-2 standard, and a method for synchronizing a frame using a preamble.
    Type: Grant
    Filed: June 26, 2012
    Date of Patent: August 19, 2014
    Assignee: LSIS Co., Ltd.
    Inventor: Jae Wook Kim
  • Patent number: 8811453
    Abstract: An intermediate symbol buffer (ISB) configuration and method is provided such that the ISB memory comprises 15 portions, one for each HSDPA spreading code. Symbols associated with a spreading code are written to the memory portion associated with the same spreading code. When a covariance calculation is performed to obtain a more accurate channel estimate, only the symbols associated with spreading codes determined to be needed for the covariance calculation are written to the ISB by a buffer block and red from the ISB by a correlation core. The symbols associated with spreading codes that are not necessary for a covariance calculation may be masked from being written or read from the ISB. In some embodiments each memory portion is an individual memory block. In other embodiments a plurality of memory blocks may contain a plurality of memory portions, one memory partition designated, at least temporarily, for each spreading code.
    Type: Grant
    Filed: September 22, 2011
    Date of Patent: August 19, 2014
    Assignee: Ericsson Modems SA
    Inventors: Ricky Nas, Cornelis Van Berkel, Jean-Paul Smeets
  • Patent number: 8804790
    Abstract: A method for communicating comprises generating at least one generalized Golay code from a concatenation of constituent Golay codes, and spreading at least a portion of a data stream with the at least one generalized Golay code. Generalized Golay codes comprise pseudo-complementary sequences having code lengths that differ from Golay complementary sequences and are characterized by low autocorrelation sidelobes relative to the autocorrelation peak.
    Type: Grant
    Filed: April 26, 2009
    Date of Patent: August 12, 2014
    Assignee: Adeptence, LLC
    Inventor: Ismail Lakkis
  • Patent number: 8798125
    Abstract: The present invention includes a method of determining a phase estimate for an input signal having pilot symbols. The method includes receiving a plurality of pilot symbols, and then multiplying two or more pilot symbol slots by corresponding correlator coefficients to correct a phase estimate of the input signal.
    Type: Grant
    Filed: August 5, 2013
    Date of Patent: August 5, 2014
    Assignee: Broadcom Corporation
    Inventors: Tommy Yu, Amy Gayle Hundhausen
  • Patent number: 8798117
    Abstract: Methods and apparatus for efficiently implementing a rake receiver which allows for rake receiver elements, e.g., fingers, to be dynamically assigned to antenna elements are described. In at least some embodiments multiple antennas are used. Rake elements are allocated to antennas in a dynamic manner with sets of weights also being assigned dynamically, e.g., based on channel estimates. Rake finger assignment to antenna's is made, in some embodiments, to maximize signal recovery taking into consideration the channel conditions detected by each antenna for the various delays that may be supported. Through the dynamic assignment of rake finger's to antenna's, a single rake finger may be coupled to different antennas at different times allowing for more efficient use as compared to systems where rake fingers are dedicated on a fixed basis to an individual antenna.
    Type: Grant
    Filed: August 28, 2009
    Date of Patent: August 5, 2014
    Assignee: Spidercloud Wireless Inc
    Inventors: Colin Campbell, Oliver Charlesworth
  • Patent number: 8787838
    Abstract: The suitability of a fixed or current mobile operating location for the receiver (19) in a data memory (13, 15) for picking up the consumption data (12) transmitted by a data radio channel in a wireless local data capture system (11) from consumption points (14) to a data memory (13, 15) can easily and reliably be qualitatively assessed in situ or for the purpose of remote diagnosis by virtue of a channel scan being initiated and the memory receiver (17) performing an RSSI measurement, which is preferably presented as a histogram (20) against current channel use. This renders permanent sources of interference and link budget problems in the data radio (particularly UHF) channel and also temporary sources of interference and collision problems in this channel identifiable and thereby avoids costly receiver location changes, without use of radio-specific specialist personnel, after a site has previously been selected for the receiver installation only empirically but inexpediently.
    Type: Grant
    Filed: June 9, 2011
    Date of Patent: July 22, 2014
    Assignee: Diehl Metering Systems GmbH
    Inventors: Thomas Kauppert, Klaus Gottschalk, Thomas Uhlmann
  • Patent number: 8767892
    Abstract: A synchronization system for initial setup of phases of local oscillators in a wireless receiver of a communication system characterized by transmission of data packets having a predetermined preamble consisting of M identical sections of L symbols followed by a single section of the same kind, multiplied by ?1, and wherein the wireless receiver is operative to perform decimation in an RF demodulator. The synchronization system includes a twofold correlator, an accumulator, a multipler, a threshold comparator, a carrier phase former and a clock phase former, and operates at a decimated symbols frequency, and performs not only preamble detection, but also symbols clock phase detection together with carrier phase detection, while enabling the theoretically possible noise immunity.
    Type: Grant
    Filed: June 5, 2013
    Date of Patent: July 1, 2014
    Assignee: Guzik Technical Enterprises
    Inventors: Anatoli B. Stein, Semen Volfbeyn