Having Multi-receiver Or Interference Cancellation Patents (Class 375/144)
  • Patent number: 10404298
    Abstract: Indication of an amount of processing performed in detection and removal of ingress noise may be provided. A frequency domain representation of a narrowband region of a digital input signal may be received. The received frequency domain representation of the narrowband region may be compared with a predetermined threshold. Results from the comparison of the received frequency domain representation of the narrowband region with the predetermined threshold may be aggregated. Based on the aggregated results, an indication of an amount of processing performed by an ingress exciser in removing the ingress noise may be provided.
    Type: Grant
    Filed: October 11, 2017
    Date of Patent: September 3, 2019
    Assignee: Cisco Technology, Inc.
    Inventors: Richard Meller, Glendon L. Akins, III, Denis Downey, James An, Koen Van Renterghem
  • Patent number: 10389424
    Abstract: A method for adapting a beam shape of a beam in a wireless communication system having multiple nodes is disclosed. Each node is provided with an antenna system configured to provide radio coverage in a cell by a cell specific beam. The method comprises: calculating a transmit weight vector for each user to be served by a given cell based on information of spatial channel characteristics for the user to be served by the given cell and long term interference characteristics estimated based on aggregated information of spatial channel characteristics for users that the given cell should avoid interfering with and that are served by other cells; performing phase normalization of the calculated transmit weight vectors; and aggregating all transmit weight vectors to establish a common transmit weight vector used to form the beam shape for the cell specific beam.
    Type: Grant
    Filed: February 4, 2016
    Date of Patent: August 20, 2019
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Niklas Jaldén, Henrik Asplund, David Astely, Martin Johansson
  • Patent number: 10342003
    Abstract: To enable low latency uplink to be used in a more preferable mode can be provided. A device includes: a communication unit configured to perform radio communication; and a control unit configured to perform control such that control information is transmitted from the communication unit to a terminal, the control information indicating that a communication scheme in which data non-orthogonally multiplexed for a plurality of layers is demodulated through cancellation of interference between the layers and in which the data is transmitted from the terminal to a base station through a predetermined uplink resource, is available.
    Type: Grant
    Filed: February 23, 2016
    Date of Patent: July 2, 2019
    Assignee: SONY CORPORATION
    Inventor: Atsushi Yoshizawa
  • Patent number: 10313174
    Abstract: The present disclosure provides a method for interference cancellation which includes: calculating a mean value and a variance value of a received signal to obtain statistics information of the received signal; calculating an estimating log-likelihood ratio using the statistics information of the received signal; calculating a decoding log-likelihood ratios of the received signal using the estimating log-likelihood ratio of the received signal, and performing calculations to update the statistics information of the received signal; repeating the above steps for a pre-determined number of times, performing hard decisions on the decoding log-likelihood ratios of the received signal, and outputting data bits obtained from the hard decision. The present disclosure also provides an apparatus, an auxiliary method, a base station and a terminal device for interference cancellation.
    Type: Grant
    Filed: January 25, 2016
    Date of Patent: June 4, 2019
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Dalin Zhu, Bin Yu, Pengfei Sun
  • Patent number: 10263660
    Abstract: Disclosed are methods and apparatus used in wireless communications. The methods and apparatus establish a codebook for use in sparse code multiple access (SCMA) encoded communications, in particular. The SCMA codebook is configured to set the codebook for at least one layer (i.e., a user) to include a constellation of points having a first grouping of constellation points located at first radial distance from an origin in a complex plane and a second grouping of constellation points located at a second radial distance from the origin. This codebook arrangement provides increased gains at receivers by optimizing the constellation shape to improve the distance between constellation points (i.e., SCMA codebook performance), and in particular more robust performance when encountering amplitude and phase misalignment in uplink (UL) multiple access.
    Type: Grant
    Filed: May 5, 2017
    Date of Patent: April 16, 2019
    Assignee: QUALCOMM Incorporated
    Inventors: Haitong Sun, Naga Bhushan, Tingfang Ji
  • Patent number: 10264554
    Abstract: Disclosed are a method and a device for allocating wireless resources in bandwidths of different sizes in a wireless LAN. The method for allocating wireless resources in bandwidths of different sizes in a wireless LAN may comprise steps in which: an AP determines a first resource unit to be allocated to an STA in a first bandwidth; and the AP schedules the first resource unit for the STA, wherein the allocation starting position of the first resource unit allocated in the first bandwidth is configured the same as the allocation starting position of a second resource unit allocated in a second bandwidth, and the allocation starting position of a first guard tone adjacent to the first resource unit may be configured differently from the allocation starting position of a second guard tone adjacent to the second resource unit on the basis of tone shifting.
    Type: Grant
    Filed: October 15, 2015
    Date of Patent: April 16, 2019
    Assignee: LG ELECTRONICS INC.
    Inventors: Jinsoo Choi, Hangyu Cho, Wookbong Lee
  • Patent number: 10250423
    Abstract: A modem apparatus is configured to provide wireless network access in accordance with an Orthogonal Frequency Division Multiplexing communications scheme. The apparatus comprises a hardware subsystem comprising baseband processing components (302) and Radio Frequency processing components (304). The baseband processing components (302) comprise a first converter component (314) arranged to convert between time and frequency domains in accordance with the Orthogonal Frequency Division Multiplexing communications scheme, and a second converter component (316) arranged to convert between parallel and serial data formats, the second converter (316) being operably coupled to the first converter (314). The Radio Frequency processing components (304) comprise a cyclic prefix processing component (318) responsive to control information.
    Type: Grant
    Filed: June 11, 2015
    Date of Patent: April 2, 2019
    Assignee: u-blox AG
    Inventors: Peter Mutitika Kibutu, Norman John Beamish
  • Patent number: 10211951
    Abstract: Embodiments of the present invention provide a decoding method and apparatus. The method includes: receiving K user signals by using N subcarriers, where one user signal is carried on at least two subcarriers of the N subcarriers, one subcarrier carries at least two user signals of the K user signals, and 2?N<K; determining, from the N subcarriers, at least two target subcarriers that carry a target user signal, and performing initialization calculation on the target subcarriers, to obtain initialization calculation results; and determining, in a logarithm domain, a probability of each codeword in a codebook of the target user signal according to the initialization calculation results, to decode the target user signal. According to this method, decoding can be performed in the logarithm domain with low complexity.
    Type: Grant
    Filed: December 29, 2016
    Date of Patent: February 19, 2019
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Gaoning He, Shunqing Zhang, Yan Chen
  • Patent number: 10211952
    Abstract: A method for receiving a signal by integer forcing in a wireless communication system is provided. The method includes receiving one or more signals through a plurality of antennas, filtering the received one or more signals using a forcing matrix, generating codewords by remapping the filtered one or more signals, acquiring a summed codeword by performing a modulo operation on the codewords, decoding the summed codeword, and acquiring original codewords by performing an inversion operation on the decoded summed codeword.
    Type: Grant
    Filed: May 11, 2017
    Date of Patent: February 19, 2019
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Min Jang, Sung-Ho Chae, Cheol Jeong
  • Patent number: 10200231
    Abstract: A communication system in which probabilistic signal shaping and FEC coding are jointly applied using a partial amplitude-shaping scheme, under which bit-words representing binary labels of the transmitted amplitudes may have (i) a fixed number of amplitude most-significant bits (MSBs) generated using a shaping code and (ii) a fixed number of amplitude least-significant bits (LSBs) generated using an FEC code, e.g., without the shaping code being applied thereto. In various embodiments, the transmitted constellation symbols can carry, as sign bits, some original information bits and/or the parity bits generated by FEC-encoding some combination of the MSBs, the LSBs, and said some original information bits. Some embodiments are compatible with convolutional FEC codes, such as the trellis-coded modulation. Some embodiments can be used in communication systems relying on discrete multi-tone modulation, such as the systems providing DSL access over subscriber lines.
    Type: Grant
    Filed: March 22, 2018
    Date of Patent: February 5, 2019
    Assignee: Nokia Technologies Oy
    Inventors: Yannick Lefevre, Joon Ho Cho
  • Patent number: 10097246
    Abstract: A control method for a communication network that has a transmitter with an array of transmit antennas and that has at least one receiver communicating with the transmitter. The receiver performs a channel measurement for a receive antenna of the receiver using a signal transmitted from the transmitter to the receiver. The receiver further determines channel coefficients for each of an array of transmit antennas at the transmitter from an output of the channel measurement, and then applies a linear, reversible and orthogonal transform to the channel coefficients, thus ascertaining channel component coefficients indicative of the individual weight of respective channel components in a transform domain. The receiver then selects one or more channel components in the transform domain and communicates to the transmitter a control signal indicative of one or more preferred channel components or a magnitude of one or more channel component coefficients, or both, in quantized form.
    Type: Grant
    Filed: December 15, 2015
    Date of Patent: October 9, 2018
    Assignee: Koninklijke Philips N.V.
    Inventors: Filippo Tosato, Timothy James Moulsley
  • Patent number: 10020967
    Abstract: A method includes receiving an n-level Pulse Amplitude Modulated (PAM-n) signal at a receiver from a transmitter via a channel. The method also includes determining one or more sampling times of the PAM-n signal. The method further includes determining one or more slicing levels of the PAM-n signal. The method also includes extracting and decomposing jitter in the PAM-n signal for each slicing level of the PAM-n signal to determine one or more jitter components. The method further includes extracting and decomposing noise in the PAM-n signal for each data level of the PAM-n signal to determine one or more noise components. The method also includes adjusting the receiver, the transmitter, the channel, or any combination thereof, based on the one or more jitter components, the one or more noise components, or both.
    Type: Grant
    Filed: February 27, 2017
    Date of Patent: July 10, 2018
    Assignee: Intel Corporation
    Inventors: Mike Peng Li, Hsinho Wu, Masashi Shimanouchi
  • Patent number: 9954719
    Abstract: Embodiments relate to a data transmission method. A relay node receives information that is about an SCMA codebook used by the relay node and that is sent by a destination node. The relay node receives two or more source signals sent by two or more source nodes. The relay node performs network coding on the received two or more source signals. The relay node performs SCMA codebook mapping on a signal obtained after the network coding, so as to obtain at least two modulation symbols. The relay node sends to the destination node, the at least two modulation symbols obtained after the SCMA mapping.
    Type: Grant
    Filed: June 29, 2017
    Date of Patent: April 24, 2018
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Lei Lu, Dai Shi, Wenting Guo
  • Patent number: 9831963
    Abstract: A MIMO communication method of performing MIMO communication between a base station having a plurality of antennas and each of a plurality of terminals covered by the base station using uplink data slots and downlink data slots that are alternately placed on a time axis. The method includes, in the base station, despreading a received signal that is transmitted from each of the plurality of terminals demodulating the transmission data transmitted from a respective terminal on the basis of the value of the estimated channel; decoding a received signal included in the uplink data slots, estimating a current channel between each of all antennas of the base station and the respective terminal; and comparing the stored value of the estimated channel with a value of the estimated current channel and updating the stored value of the estimated channel to the value of the estimated current channel.
    Type: Grant
    Filed: May 18, 2015
    Date of Patent: November 28, 2017
    Assignees: Sony Corporation, Sony Mobile Communications Inc.
    Inventors: Shigeo Kusunoki, Erik Bengtsson, Ying Zhinong
  • Patent number: 9813092
    Abstract: A signal processing method and apparatus are disclosed. The signal processing method includes: receiving, by a first signal processing apparatus, a mixed signal; acquiring, by the first signal processing apparatus, an energy strength ratio of the mixed signal, where the energy strength ratio includes a ratio of energy strength of a signal sent by a first signal source and received by the first signal processing apparatus to energy strength of a signal sent by a second signal source and received by the first signal processing apparatus; and if the energy strength ratio is less than a first preset threshold, using, by the first signal processing apparatus, the signal sent by the second signal source in the mixed signal as an interference signal and separating the interference signal, and determining that a mixed signal obtained after the separation processing is the desired signal sent by the first signal source.
    Type: Grant
    Filed: September 9, 2016
    Date of Patent: November 7, 2017
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Meng Cai, Kun Li, Hongli Jiang, Yu Liu
  • Patent number: 9798013
    Abstract: Method of detecting interference in a satellite radio-navigation signal, characterized in that it comprises the following steps: determining a first temporal position for which the correlation between the said signal and a local spreading code, offset by the said position, is maximum; determining a plurality of measurements of correlation between the said signal and a local spreading code offset by a plurality of secondary temporal positions, the said plurality of secondary temporal positions and the said first temporal position being regularly spaced; determining, for a plurality of correlation measurement pairs formed by two measurements at two consecutive temporal positions, the phase difference between the two correlation measurements of the said pair; calculating an item of information representative of the standard deviation of the said phase difference; and comparing the said item of information with a detection threshold configured at least as a function of the ratio of the powers of the signal and
    Type: Grant
    Filed: October 28, 2014
    Date of Patent: October 24, 2017
    Assignee: Thales
    Inventors: Marc Revol, David Pietin
  • Patent number: 9788033
    Abstract: In one embodiment, a consumer device is assigned, at a broadcast headend to one of at least two groups of consumer devices, the two groups including a first group of consumer devices which is required to play content of a second type in order to view content of a first type and a second group of consumer devices which is not required to play content of the second type in order to view content of the first type. A video broadcast stream is sent from the broadcast headend to the consumer device, the video broadcast stream comprising content of the first type sent associated with a first packet ID (PID) and content of the second type sent associated with a second PID, wherein the first PID and the second PID are processed at the consumer device at the same time.
    Type: Grant
    Filed: June 29, 2016
    Date of Patent: October 10, 2017
    Assignee: Cisco Technology, Inc.
    Inventors: Harel Cain, Michal Devir, Yaron Sella
  • Patent number: 9774405
    Abstract: A system for frequency-isolated self-interference cancellation includes a transmit coupler, that samples an RF transmit signal to create a sampled RF transmit signal having a first RF carrier frequency, an RF self-interference canceller that transforms the sampled RF transmit signal to an RF self-interference cancellation signal, a receive coupler, that combines the RF self-interference cancellation signal with an RF receive signal to form a reduced-interference receive signal, and a frequency shifter.
    Type: Grant
    Filed: July 29, 2015
    Date of Patent: September 26, 2017
    Assignee: Kumu Networks, Inc.
    Inventors: Dinesh Bharadia, Jeffrey Mehlman, Wilhelm Steffen Hahn
  • Patent number: 9755869
    Abstract: A system and method use tunnelizing for analyzing frequency spectrum. The method may include the steps of under sampling an input signal to take samples in one or more tunnels each with a tunnel bandwidth that is equal to or less than a total analysis bandwidth of the input signal; detecting one or more cyclostationary features of the input signal based on the samples; and determining one or more signal types of the one or more cyclostationary features based on the one or more cyclostationary features.
    Type: Grant
    Filed: November 18, 2014
    Date of Patent: September 5, 2017
    Assignee: BAE Systems Information and Electronic Systems Integration Inc.
    Inventors: Michael P. Anthony, Jack Chuang, Apurva N. Mody, Chad M. Spooner
  • Patent number: 9596669
    Abstract: A semiconductor device comprising interface logic for transmitting data bursts across an interface. The interface logic is arranged to transmit bursts of data across the interface such that the start of a burst of data is substantially aligned with a symbol interval (SI) boundary. The interface logic is further arranged to apply an offset to the SI boundary at the start of the burst of data.
    Type: Grant
    Filed: February 4, 2014
    Date of Patent: March 14, 2017
    Assignee: NXP USA, INC.
    Inventors: Paul Kelleher, Michael O'Brien, Conor O'Keeffe
  • Patent number: 9559871
    Abstract: A method and an apparatus for using a plurality of antennas to equalize a composite propagation channel of a wideband wireless communication is provided. The method comprises adjusting a corresponding weight associated with at least two of the plurality of antennas to obtain a channel response from the plurality of antennas over a composite propagation channel. The method further comprises equalizing the channel response of the composite propagation channel over a given bandwidth based on the corresponding weights for the wireless communication over a wideband frequency range. By adjusting a complex weight associated with each of the set of transmit antennas, a wireless communication system may obtain a channel response from the plurality of antennas over the composite propagation channel.
    Type: Grant
    Filed: January 10, 2006
    Date of Patent: January 31, 2017
    Assignee: Alcatel-Lucent USA Inc.
    Inventor: Dennis Raymond Morgan
  • Patent number: 9438377
    Abstract: A two-reference-point-pair determining unit 101 determines two reference point pairs by selecting two transmission symbol points with their LLR computation target bit being 0 and two transmission symbol points with their LLR computation target bit being 1. An LLR computation unit 113 assigns weights to the two LLRs calculated for the two reference point pairs, respectively, followed by adding them, and further adds to the addition result a correction term that may be zero sometimes, thus computing LLR for the two reference point pairs.
    Type: Grant
    Filed: October 5, 2012
    Date of Patent: September 6, 2016
    Assignee: Mitsubishi Electric Corporation
    Inventors: Kenya Sugihara, Wataru Matsumoto
  • Patent number: 9432080
    Abstract: For each channel of a plurality of channels of a Vector transmission system, a sequence of cross-coupling test signals representing a sequence of complex numbers may be transmitted or received. And for each channel of the plurality of channels a sequence of the real part of the sequence of complex numbers is different to a sequence of the imaginary part of the sequence of complex numbers.
    Type: Grant
    Filed: December 12, 2008
    Date of Patent: August 30, 2016
    Assignee: Lantiq Deutschland GmbH
    Inventor: Heinrich Schenk
  • Patent number: 9432103
    Abstract: A cellular communication system comprises a Multiple-In Multiple-Out, MIMO, transmitter and receiver. The MIMO transmitter comprises a message generator for generating MIMO messages comprising selected training sequences and transceivers transmitting the messages on a plurality of antennas. The training sequences are selected by a midamble selector from a set of training sequences in response to an associated antenna on which the message is to be transmitted. The set of training sequences is associated with the cell of the MIMO transmitter and comprises disjoint subsets of training sequences for each of the plurality of antennas. The receiver comprises a transmit antenna detector which determines which antenna of the MIMO transmitter the message is transmitted from in response to the training sequence of the received message.
    Type: Grant
    Filed: August 28, 2014
    Date of Patent: August 30, 2016
    Assignee: SONY CORPORATION
    Inventors: Peter B. Darwood, Vishakan Ponnampalam, Alan Edward Jones
  • Patent number: 9391655
    Abstract: A digital filter for narrowband interference rejection, including modules of narrowband interference rejection connected in series, each of which includes the following elements connected in series: a block of successive vector rotation based on the CORDIC vector rotation algorithm for integers, a block of reduction of the length of the rotated vector to maintain the same number of bits for digital signal representation, a block of high-pass filters for orthogonal components of the reduced vector in order to remove the interference from zero frequency region. The filter can be implemented without multiplication.
    Type: Grant
    Filed: January 12, 2016
    Date of Patent: July 12, 2016
    Assignee: Topcon Positioning Systems, Inc.
    Inventors: Andrey V. Veitsel, Victor A. Prasolov, Dmitry D. Murzinov
  • Patent number: 9374140
    Abstract: A method of selecting antenna segments for transmission and/or reception in a MIMO wireless transmission system using sectorized directional antennas, includes the steps of selecting, from an initial set of ranked link antenna patterns, a link antenna pattern having the best average rank, at predetermined time intervals, successively selecting a subset of link antenna patterns having average ranks within a predetermined distance to the best average rank, determining an average link performance of the link antenna patterns selected in the preceding step, determining an average rank of the link antenna patterns, for which the average link performance has been determined in the preceding step, selecting the link antenna pattern having the best average rank, and repeating the process at the next predetermined time interval.
    Type: Grant
    Filed: March 12, 2013
    Date of Patent: June 21, 2016
    Assignee: Thomson Licensing
    Inventors: Theodoros Salonidis, Tae Hyun Kim, Henrik Lundgren
  • Patent number: 9350414
    Abstract: A digital filter for narrowband interference rejection, including modules of narrowband interference rejection connected in series, each of which includes the following elements connected in series: a block of successive vector rotation based on the CORDIC vector rotation algorithm for integers, a block of reduction of the length of the rotated vector to maintain the same number of bits for digital signal representation, a block of high-pass filters for orthogonal components of the reduced vector in order to remove the interference from zero frequency region. The filter can be implemented without multiplication.
    Type: Grant
    Filed: October 28, 2013
    Date of Patent: May 24, 2016
    Assignee: Topcon Positioning Systems, Inc.
    Inventors: Andrey V. Veitsel, Victor A. Prasolov, Dmitry D. Murzinov
  • Patent number: 9331716
    Abstract: The present inventions are related to systems and methods for data processing, and more particularly to systems and methods for data encoding.
    Type: Grant
    Filed: August 27, 2014
    Date of Patent: May 3, 2016
    Assignee: Avago Technologies General IP (Singapore) Pte. Ltd.
    Inventors: Pavel A. Panteleev, Elyar E. Gasanov, Andre P. Sokolov, Yuri Shutkin, Dmitriy V. Alekseev
  • Patent number: 9307420
    Abstract: A method for noise rise estimation in a wireless communication system comprises measuring (210) of received total wideband power of an antenna a plurality of times. An estimate of a noise floor measure is computed (212) based on at least a number of the measured received total wideband powers of the antenna. Interference whitening of a received signal is performed (214) per user for a multitude of users. A useful signal power per user after the interference whitening, preferably Frequency Domain Equalization, is determined (216). A noise rise measure per user is calculated (220), based at least on the useful signal power per user and the noise floor measure. The calculation in turn comprises compensation of the noise rise measure per user for the effects of the interference whitening. An arrangement for noise rise estimation is adapted for such a method. A radio base station comprises such an arrangement.
    Type: Grant
    Filed: October 1, 2010
    Date of Patent: April 5, 2016
    Assignee: TELEFONAKTIEBOLAGET L M ERICSSON
    Inventors: Torbjörn Wigren, Henrik Egnell, Ari Kangas
  • Patent number: 9294163
    Abstract: An apparatus and a method for selecting a beam in a wireless communication system capable of forming a plurality of antenna beams are provided. The method for transmitting signals includes transmitting a training signal by using a plurality of first beams and a plurality of second beams, and transmitting at least one of user control information and data by using at least one fourth beam among a plurality of third beams.
    Type: Grant
    Filed: August 21, 2012
    Date of Patent: March 22, 2016
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Yung-Soo Kim
  • Patent number: 9246646
    Abstract: Method and apparatus for transmitting pilot on multiple antennas are disclosed. A wireless transmit/receive unit (WTRU) may transmit a primary dedicated physical control channel (DPCCH) and at least one secondary DPCCH via multiple antennas using different channelization codes. The first eight pilot symbols of the secondary DPCCH may be same as pilot symbols of length eight of the primary DPCCH. The secondary DPCCH may include a same number of pilot bits as the primary DPCCH in a normal mode and in a compressed mode, respectively. The transmit power of the secondary DPCCH may be adjusted based on a ratio of a number of pilot symbols in the primary DPCCH and the secondary DPCCH. When a required transmit power exceeds a maximum allowed transmit power of the WTRU, power scaling may be applied equally to the primary DPCCH and the secondary DPCCH.
    Type: Grant
    Filed: September 30, 2011
    Date of Patent: January 26, 2016
    Assignee: InterDigital Patent Holdings, Inc.
    Inventors: Benoit Pelletier, Lujing Cai, Hong Zhang, Fengjun Xi, Joseph S. Levy
  • Patent number: 9240917
    Abstract: Different data communication architectures deliver a wide variety of content, including audio and video content, to consumers. The architectures may utilize orbital angular momentum to deliver more bandwidth across multiple channels than any single communication channel can carry. In some implementations, the communication architectures distribute data across multiple orbital angular momentum channels in a bonded channel group.
    Type: Grant
    Filed: June 30, 2015
    Date of Patent: January 19, 2016
    Assignee: Broadcom Corporation
    Inventors: Xuemin Chen, Bradley Donald Blanche, Gordon Yong Li
  • Patent number: 9237449
    Abstract: 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.
    Type: Grant
    Filed: December 21, 2009
    Date of Patent: January 12, 2016
    Assignee: THOMSON LICENSING
    Inventors: Wen Gao, Hou-Shin Chen
  • Patent number: 9231683
    Abstract: The present invention relates to a control method for a communication network that has a transmitter with an array of transmit antennas and that has at least one receiver communicating with the transmitter. The receiver performs a channel measurement for a receive antenna of the receiver using a signal transmitted from the transmitter to the receiver. The receiver further determines channel coefficients for each of an array of transmit antennas at the transmitter from an output of the channel measurement, and then applies a linear, reversible and orthogonal transform to the channel coefficients, thus ascertaining channel component coefficients indicative of the individual weight of respective channel components in a transform domain. The receiver then selects one or more channel components in the transform domain and communicates to the transmitter a control signal indicative of one or more preferred channel components or a magnitude of one or more channel component coefficients, or both, in quantized form.
    Type: Grant
    Filed: August 20, 2007
    Date of Patent: January 5, 2016
    Assignee: Koninklijke Philips N.V.
    Inventors: Filippo Tosato, Timothy James Moulsley
  • Patent number: 9231836
    Abstract: A system and method for estimating a channel in wireless communication systems using Orthogonal Frequency Division Multiplexing (OFDM). From the received OFDM symbols, Maximum Likelihood (ML) estimate of the channel frequency response is obtained at the pilot locations. A hypothesis test is performed on the ML estimates and the outcome of the hypothesis test is used to decide a shrinkage target. Biased estimation methods are used to shrink the ML estimates towards the shrinkage target to obtain better estimates of the channel frequency response at the pilot locations and these estimates are interpolated using a Filter to get a set of complete estimates of the channel over the resource block. The Filter is an Empirical Weiner Filter or a robust 2D-MMSE filter and the biased estimation is done using either a James-Stein (JS) estimator or a shrinkage estimator or an empirical Bayes estimator.
    Type: Grant
    Filed: June 11, 2010
    Date of Patent: January 5, 2016
    Assignee: Centre of Excellence in Wireless Technology
    Inventors: Sheetal Kalyani, Lakshminarayanan Raghavendran, Krishnamurthi Giridhar
  • Patent number: 9219536
    Abstract: In a radio communication system, a plurality of transmission antennas and a plurality of reception antennas are arranged such that a channel matrix having channel responses between the plurality of transmission antennas and the plurality of reception antennas as elements is a circulant matrix.
    Type: Grant
    Filed: July 29, 2014
    Date of Patent: December 22, 2015
    Assignee: FUJITSU LIMITED
    Inventors: Liang Zhou, Yoji Ohashi
  • Patent number: 9204317
    Abstract: Some embodiments provide a method in a wireless device for reporting channel state information, CSI, for a CSI process. The CSI process corresponds to a reference signal resource and an interference measurement resource. According to the method, the wireless device obtains an adjustment value associated with the CSI process. The wireless device estimates an effective channel based on one or more reference signals received in the reference signal resource, and applies the adjustment value to the estimated effective channel, thereby obtaining an adjusted effective channel. Furthermore, the wireless device determines channel state information based on the adjusted effective channel, and on interference estimated based on the interference measurement resource. Finally, the channel state information is transmitted to a network node.
    Type: Grant
    Filed: May 11, 2012
    Date of Patent: December 1, 2015
    Assignee: TELEFONAKTIEBOLAGET L M ERICSSON (PUBL)
    Inventors: David Hammarwall, Svante Bergman
  • Patent number: 9203465
    Abstract: The invention relates to a method of acquiring a GPS signal, spread by a Gold sequence obtained as the sum of a first M-sequence and a second M-sequence, this second M-sequence being characteristic of a satellite among a plurality of satellites in the GPS system. The acquisition method comprises a sampling step starting from a given time (410), a multiplication step for the sequence of samples obtained with the first M-sequence (420) and an iterative decoding step for the decoded values (430) making it possible to estimate the content of the second shift register of the second M-sequence at said given time. If the content thus estimated is identical to the initial content of the second register for an identified satellite (443), the receiver is synchronized with this satellite at said given time (490).
    Type: Grant
    Filed: February 20, 2014
    Date of Patent: December 1, 2015
    Assignee: Commissariat à l'énergie atomique et aux énergies alternatives
    Inventors: Mathieu Bouvier Des Noes, Valentin Savin
  • Patent number: 9100110
    Abstract: Disclosed is non-linear interference cancellation (NLIC) on a victim receiver in a communication system in which there is self-jamming interference from multiple aggressor transmitters. The victim receiver may implement cascaded NLIC operations using multiple interference signals in succession to remove the multiple interference signals from the Rx signal and to cancel or mitigate the self-jamming interference. The reconstruction and removal of the interference signals may be ordered based on the expected level of interference from the interference signals on the desired Rx signal. The victim receiver may first perform NLIC operation using the Tx signal from the transmitter aggressor estimated to generate the strongest interference signal to remove the strongest interference signal from the Rx signal first.
    Type: Grant
    Filed: August 29, 2013
    Date of Patent: August 4, 2015
    Assignee: QUALCOMM Incorporated
    Inventors: Jibing Wang, Roberto Rimini
  • Patent number: 9036682
    Abstract: A method for mitigating a multi-path-induced error in a global navigation satellite system comprises, for a respective measurement epoch, obtaining respective representations of a composite signal including a plurality of value-pairs of the composite signal. The method further comprises, with respect to the measurement epoch: obtaining a plurality of coefficients for a set of linear equations based on the plurality of value-pairs of the composite signal; iteratively obtaining solutions for the set of linear equations, thereby solving for a code tracking timing offset, a time delay of a multi-path signal of the composite signal relative to its direct-path signal, and orthogonal representations of the multi-path signal; determining a phase error between the composite signal and the direct-path signal, due to the time delay, in accordance with the orthogonal representations of the multi-path signal; and correcting for the code tracking timing offset and the phase error.
    Type: Grant
    Filed: March 6, 2014
    Date of Patent: May 19, 2015
    Assignee: DEERE & COMPANY
    Inventors: Richard G. Keegan, Ronald R. Hatch
  • Patent number: 9031599
    Abstract: A method of operating base station includes determining a first transmit power of a user equipment (UE), which includes determining a serving base station receive power, determining a path loss of the UE to the base station, determining a downlink signal to noise and interference ratio (SNIR) at the UE, and forming the first UE transmit power. Forming the first UE transmit power comprises summing the serving base station receive power, the path loss of the UE to the base station and the downlink SNIR. The method further includes instructing the UE to transmit at the first UE transmit power.
    Type: Grant
    Filed: December 8, 2009
    Date of Patent: May 12, 2015
    Assignee: Futurewei Technologies, Inc.
    Inventors: Gamini Senarath, Israfil Bahceci, Peiying Zhu, Aaron Callard
  • Patent number: 9030342
    Abstract: An integrated circuit includes a component calculator configured to compute at least one component value of a highly programmable analog-to-digital converter (ADC) from at least one application parameter, and a mapping module configured to map the component value to a corresponding register setting of the ADC based on at least one process parameter, wherein the integrated circuit produces digital control signals capable of programming the ADC. In a specific embodiment, the component calculator uses an algebraic function of a normalized representation of the application parameter to approximately evaluate at least one normalized ADC coefficient. The component value is further calculated by denormalizing the normalized ADC coefficient. In another specific embodiment, the component calculator uses an algebraic function of the application parameter to calculate the component value.
    Type: Grant
    Filed: July 18, 2013
    Date of Patent: May 12, 2015
    Assignee: Analog Devices Global
    Inventors: Kevin Cao-Van Lam, Richard E. Schreier, Donald W. Paterson
  • Patent number: 9025638
    Abstract: A receiver circuit provides improved noise estimation processing by at least partially removing receiver frequency error bias. An initial noise estimate is compensated using an error term based on the observed receiver frequency error, and the resulting compensated noise estimate can be used to improve other signal processing in the receiver. For example, the receiver may use compensated noise estimates to generate signal quality estimates, e.g., Signal-to-Interference (SIR) estimates, having improved accuracy. Additionally, or alternatively, the receiver may use the compensated noise estimates to generate RAKE combining weights having improved noise suppression characteristics. In an exemplary embodiment, the initial noise estimate is a noise correlation matrix generated from a received reference signal, e.g., pilot symbols, and the error term is an error matrix directly generated using he observed receiver frequency error and channel estimates taken from the reference signal.
    Type: Grant
    Filed: November 18, 2004
    Date of Patent: May 5, 2015
    Assignee: Telefonaktiebolaget L M Ericsson (publ)
    Inventor: Anders Wallén
  • Patent number: 9020082
    Abstract: A method includes, by a detector, receiving from a low frequency equalizer a data signal and an error signal, matching a tail portion of the data signal to a tail portion of an extended filter-pattern, and, based upon the error signal at a given location of the data signal and upon the imbalance, producing an output signal indicating whether a long-term residual intersymbol interference of the data signal in the error signal has a positive sign or a negative sign. The tail portion of the extended filter-pattern includes an imbalance between a count of each of the possible values and an unfixed sequence. The data signal includes data points with one of at least two possible values.
    Type: Grant
    Filed: September 4, 2012
    Date of Patent: April 28, 2015
    Assignee: Fujitsu Limited
    Inventor: Yasuo Hidaka
  • 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: 9008207
    Abstract: A system and methods for estimating a noise power level in an uplink signal for a virtual MIMO system is disclosed. The system comprises a demodulation reference signal (DMRS) module configured to obtain a DMRS receive symbol from the uplink signal and determine a DMRS sequence for a first UE in the virtual MIMO system. An autocorrelation module is configured to calculate an average autocorrelation value for the subcarriers in the uplink signal. A cross-correlation module is configured to calculate first and second cross-correlation values of the uplink signal RZ(l) for values of l selected such that the sum of the received power from the first UE and the second UE can be accurately estimated. A noise power level module is configured to determine the noise power level for the uplink signal using the average autocorrelation value and the first and second cross correlation values.
    Type: Grant
    Filed: October 11, 2010
    Date of Patent: April 14, 2015
    Assignee: Intel Corporation
    Inventors: Peng Cheng, Changlong Xu, Xuebin Yang, Feng Zhou, Yang Gao
  • Patent number: 9008246
    Abstract: The present technique relates to a transmission device, a transmission method, a reception device, a reception method, a program, and a communication system which can realize a system capable of promptly addressing a newly-generated disturbance wave. A broadcasting device of the present disclosure includes: a reception unit which receives reception interference information notified from the reception device; a setting unit which sets a frequency of a notch to be provided in a transmission signal on the basis of the reception interference information that has been received; a modulation unit which provides the notch in accordance with the set frequency of the notch while at the same time generates a modulated signal by modulating information to be transmitted; and a send-out unit which sends out the modulated signal as the transmission signal.
    Type: Grant
    Filed: March 29, 2012
    Date of Patent: April 14, 2015
    Assignee: Sony Corporation
    Inventors: Hiroo Takahashi, Takahiro Okada
  • Patent number: 9001867
    Abstract: A method, an apparatus, and a computer program product for wireless communication are provided. The apparatus receives an intended signal from a first wireless device operating in a full-duplex mode, receives an interfering signal from a second wireless device communicating with the first wireless device, and reduces an interference of the received intended signal caused by the interfering signal by projecting a matrix of the received intended signal onto a space associated with the interfering signal.
    Type: Grant
    Filed: February 13, 2013
    Date of Patent: April 7, 2015
    Assignee: QUALCOMM Incorporated
    Inventors: Hua Wang, Achaleshwar Sahai, Zrinka Puljiz, Shailesh Patil, Pablo Alejandro Anigstein, Junyi Li
  • Patent number: 9002282
    Abstract: A coexistence system including a first transceiver module in a first network device, generating a first request signal that requests transmission or reception for the first transceiver module, and operating according to a first wireless communication standard. An interface, based on the first request signal, generates a first priority signal, which indicates a first priority level of first data signals. A second transceiver module is in the first network device and generates a second request and priority signals. The second transceiver module operates according to a second wireless communication standard. The second request signal requests transmission or reception for the first transceiver module. The second priority signal indicates a second priority level of second data signals. An arbitration module (i) based on the first and second priority levels, arbitrates the first and second request signals, and (ii) based thereon, selectively connects antennas to the first and second transceiver modules.
    Type: Grant
    Filed: December 14, 2012
    Date of Patent: April 7, 2015
    Assignee: Marvell International Ltd.
    Inventors: Josselin de la Broise, Li-Fu Jeng, Deepak Jain, Rajesh Juluri
  • Patent number: 9001910
    Abstract: Systems and methods for computing a decoder noise power estimate are provided. A pilot signal transmitted through a fading channel from a wireless transmission source is received. Signal power of the received pilot signal, channel noise power, and channel estimation error are computed. The decoder noise power estimate is determined based on the computed signal power, channel noise power, and channel estimation error.
    Type: Grant
    Filed: April 11, 2014
    Date of Patent: April 7, 2015
    Assignee: Marvell International Ltd.
    Inventors: Jiwoong Choi, Yakun Sun, Jungwon Lee, Jianyi Huang