Automatic Patents (Class 375/230)
  • Patent number: 10461890
    Abstract: The present disclosure relates to a pre-5th-Generation (5G) or 5G communication system for supporting higher data rates Beyond 4th-Generation (4G) communication systems such as Long Term Evolution (LTE). A method for operating a receiver in a wireless communication system may include: receiving a signal from a transmitter; performing Integer Forcing (IF) equalization on the received signal; determining a log LikeLihood Ratio (LLR) value of each bit by using a posteriori probability of each bit for the signal determined based on an equalization matrix and a likelihood value for the signal; and decoding the signal by using the LLR value.
    Type: Grant
    Filed: February 7, 2018
    Date of Patent: October 29, 2019
    Assignees: Samsung Electronics Co., Ltd., Postech Academy-Industry Foundation
    Inventors: Seok-Ki Ahn, Kyeongcheol Yang, Daeyeol Yang, Sunghye Cho
  • Patent number: 10447428
    Abstract: A transmitting apparatus is provided. The transmitting apparatus includes: an encoder configured to generate a low-density parity check (LDPC) codeword by LDPC encoding based on a parity check matrix; an interleaver configured to interleave the LDPC codeword; and a modulator configured to map the interleaved LDPC codeword onto a modulation symbol, wherein the modulator is further configured to map a bit included in a predetermined bit group from among a plurality of bit groups constituting the LDPC codeword onto a predetermined bit of the modulation symbol.
    Type: Grant
    Filed: May 19, 2015
    Date of Patent: October 15, 2019
    Assignee: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Se-ho Myung, Hong-sil Jeong, Kyung-joong Kim
  • Patent number: 10432229
    Abstract: A bit interleaver, a bit-interleaved coded modulation (BICM) device and a bit interleaving method are disclosed herein. The bit interleaver includes a first memory, a processor, and a second memory. The first memory stores a low-density parity check (LDPC) codeword having a length of 16200 and a code rate of 2/15. The processor generates an interleaved codeword by interleaving the LDPC codeword on a bit group basis. The size of the bit group corresponds to a parallel factor of the LDPC codeword. The second memory provides the interleaved codeword to a modulator for 16-symbol mapping.
    Type: Grant
    Filed: September 5, 2018
    Date of Patent: October 1, 2019
    Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Sung-Ik Park, Sun-Hyoung Kwon, Bo-Mi Lim, Jae-Young Lee, Heung-Mook Kim, Nam-Ho Hur
  • Patent number: 10432255
    Abstract: A transmission device of the present disclosure includes: a driver unit that transmits a data signal with use of a first voltage state, a second voltage state, and a third voltage state interposed between the first voltage state and the second voltage state, and is configured to make a voltage in the third voltage state changeable; and a controller that changes the voltage in the third voltage state to cause the driver unit to perform emphasis.
    Type: Grant
    Filed: January 12, 2017
    Date of Patent: October 1, 2019
    Assignee: Sony Corporation
    Inventor: Hiroaki Hayashi
  • Patent number: 10419031
    Abstract: A bit interleaver, a bit-interleaved coded modulation (BICM) device and a bit interleaving method are disclosed herein. The bit interleaver includes a first memory, a processor, and a second memory. The first memory stores a low-density parity check (LDPC) codeword having a length of 64800 and a code rate of 7/15. The processor generates an interleaved codeword by interleaving the LDPC codeword on a bit group basis. The size of the bit group corresponds to a parallel factor of the LDPC codeword. The second memory provides the interleaved codeword to a modulator for quadrature phase shift keying (QPSK) modulation.
    Type: Grant
    Filed: January 9, 2017
    Date of Patent: September 17, 2019
    Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Sung-Ik Park, Sun-Hyoung Kwon, Jae-Young Lee, Heung-Mook Kim, Nam-Ho Hur
  • Patent number: 10393781
    Abstract: The present invention relates to a system for impedance generation comprising impedance generation means arranged for receiving an input clock signal and for generating at least one parameter at a frequency derived from the input clock signal, impedance tuning means arranged for receiving the at least one parameter, for synthesizing an impedance based on the received at least one parameter and for outputting the synthesized impedance to a device under test.
    Type: Grant
    Filed: July 29, 2014
    Date of Patent: August 27, 2019
    Assignee: National Instruments Ireland Resources Limited
    Inventor: Marc Vanden Bossche
  • Patent number: 10340954
    Abstract: A transmitting apparatus is provided. The transmitting apparatus includes: an encoder configured to generate a Low Density Parity Check (LDPC) codeword by LDPC encoding based on a parity check matrix; an interleaver configured to interleave the LDPC codeword; and a modulator configured to map the interleaved LDPC codeword onto a plurality of modulation symbols, wherein the modulator is configured to map bits included in a predetermined bit group from among a plurality of bit groups constituting the LDPC codeword onto a predetermined bit of each of the modulation symbols.
    Type: Grant
    Filed: May 19, 2015
    Date of Patent: July 2, 2019
    Assignee: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Hong-sil Jeong, Kyung-joong Kim, Se-ho Myung
  • Patent number: 10164804
    Abstract: Devices and methods for adjusting operation of a receiver that includes a continuous time linear equalizer, a decision feedback equalizer, and a feed forward equalizer. Operation of the receiver may be controlled by determining whether the receiver is operating in operation region using frequency responses of the feed forward equalizer at a first frequency and a second frequency and using the frequency responses of the decision feedback equalizer at the first frequency and the second frequency. If the operation is outside the frequency, a parameter of the continuous time linear equalizer is adjusted based on the frequency responses of the feed forward equalizer and the decision feedback equalizer.
    Type: Grant
    Filed: June 21, 2017
    Date of Patent: December 25, 2018
    Assignee: INTEL CORPORATION
    Inventors: Yu Liao, Wenyi Jin, Jihong Ren
  • Patent number: 9807675
    Abstract: The invention relates to a method for synchronizing a mobile station to a base station, comprising in the base station a act of generating an information about a frequency of a channel which is used to transmit data about the identity of the base station and a act of transmitting the information from the base station to the mobile station.
    Type: Grant
    Filed: August 9, 2011
    Date of Patent: October 31, 2017
    Assignee: Lantiq Deutschland GmbH
    Inventors: Elias Bjarnason, Stefan Eder
  • Patent number: 9749156
    Abstract: An apparatus and a method for generating statistical signals having a characteristic similar to an input signal of a receiving apparatus to determine an optimized filter coefficient through an adaptive equalization algorithm are provided. The apparatus includes a channel estimator, a statistical signal generator, and an adaptive algorithm processor. The channel estimator estimates a channel of a reception signal. The statistical signal generator generates a plurality of signals having the same characteristic as that of a reception signal using a channel determined through a channel estimation process. The adaptive algorithm processor performs an adaptive equalization algorithm using the plurality of generated signals to determine an optimized filter coefficient.
    Type: Grant
    Filed: June 19, 2009
    Date of Patent: August 29, 2017
    Assignee: Samsung Electronics Co., Ltd
    Inventors: Seong-Wook Song, Se-Jin Kong, Hun-Kee Kim
  • Patent number: 9705529
    Abstract: A bit interleaver, a bit-interleaved coded modulation (BICM) device and a bit interleaving method are disclosed herein. The bit interleaver includes a first memory, a processor, and a second memory. The first memory stores a low-density parity check (LDPC) codeword having a length of 16200 and a code rate of 3/15. The processor generates an interleaved codeword by interleaving the LDPC codeword on a bit group basis. The size of the bit group corresponds to a parallel factor of the LDPC codeword. The second memory provides the interleaved codeword to a modulator for 256-symbol mapping.
    Type: Grant
    Filed: May 22, 2015
    Date of Patent: July 11, 2017
    Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Sung-Ik Park, Sun-Hyoung Kwon, Bo-Mi Lim, Jae-Young Lee, Heung-Mook Kim, Nam-Ho Hur
  • Patent number: 9698826
    Abstract: A bit interleaver, a bit-interleaved coded modulation (BICM) device and a bit interleaving method are disclosed herein. The bit interleaver includes a first memory, a processor, and a second memory. The first memory stores a low-density parity check (LDPC) codeword having a length of 16200 and a code rate of 4/15. The processor generates an interleaved codeword by interleaving the LDPC codeword on a bit group basis. The size of the bit group corresponds to a parallel factor of the LDPC codeword. The second memory provides the interleaved codeword to a modulator for 256-symbol mapping.
    Type: Grant
    Filed: May 21, 2015
    Date of Patent: July 4, 2017
    Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Sung-Ik Park, Sun-Hyoung Kwon, Bo-Mi Lim, Jae-Young Lee, Heung-Mook Kim, Nam-Ho Hur
  • Patent number: 9698829
    Abstract: A bit interleaver, a bit-interleaved coded modulation (BICM) device and a bit interleaving method are disclosed herein. The bit interleaver includes a first memory, a processor, and a second memory. The first memory stores a low-density parity check (LDPC) codeword having a length of 16200 and a code rate of 2/15. The processor generates an interleaved codeword by interleaving the LDPC codeword on a bit group basis. The size of the bit group corresponds to a parallel factor of the LDPC codeword. The second memory provides the interleaved codeword to a modulator for 16-symbol mapping.
    Type: Grant
    Filed: May 20, 2015
    Date of Patent: July 4, 2017
    Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Sung-Ik Park, Sun-Hyoung Kwon, Bo-Mi Lim, Jae-Young Lee, Heung-Mook Kim, Nam-Ho Hur
  • Patent number: 9660850
    Abstract: A method and an apparatus for transmitting broadcast signals thereof are disclosed. The apparatus for transmitting broadcast signals comprises an encoder for encoding service data, a mapper for mapping the encoded service data into a plurality of OFDM (Orthogonal Frequency Division Multiplex) symbols to build at least one signal frame, a frequency interleaver for frequency interleaving data in the at least one signal frame by using a different interleaving-seed which is used for every OFDM symbol pair comprised of two sequential OFDM symbols, a modulator for modulating the frequency interleaved data by an OFDM scheme and a transmitter for transmitting the broadcast signals having the modulated data.
    Type: Grant
    Filed: August 14, 2014
    Date of Patent: May 23, 2017
    Assignee: LG ELECTRONICS INC.
    Inventors: Jongseob Baek, Jaehyung Kim, Woosuk Ko, Sungryong Hong, Woochan Kim
  • Patent number: 9614644
    Abstract: A transmitting apparatus is provided. The transmitting apparatus includes: an encoder configured to perform a low-density parity check (LDPC) encoding on input bits using a parity check matrix to generate an LDPC codeword comprising information word bits and parity bits; an interleaver configured to interleave the LDPC codeword; and a modulator configured to map the interleaved LDPC codeword onto a modulation symbol, wherein the modulator is further configured to map a bit included in a predetermined bit group from among a plurality of bit groups constituting the LDPC codeword onto a predetermined bit of the modulation symbol.
    Type: Grant
    Filed: April 15, 2016
    Date of Patent: April 4, 2017
    Assignee: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Hong-sil Jeong, Kyung-joong Kim, Se-ho Myung, Daniel Ansorregui Lobete, Belkacem Mouhouche
  • Patent number: 9602245
    Abstract: A transmitting apparatus is provided. The transmitting apparatus includes: an encoder configured to perform a low-density parity check (LDPC) encoding on input bits using a parity check matrix to generate an LDPC codeword comprising information word bits and parity bits; an interleaver configured to interleave the LDPC codeword; and a modulator configured to map the interleaved LDPC codeword onto a modulation symbol, wherein the modulator is further configured to map a bit included in a predetermined bit group from among a plurality of bit groups constituting the LDPC codeword onto a predetermined bit of the modulation symbol.
    Type: Grant
    Filed: May 19, 2015
    Date of Patent: March 21, 2017
    Assignee: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Hong-sil Jeong, Kyung-joong Kim, Se-ho Myung, Daniel Ansorregui Lobete, Belkacem Mouhouche
  • Patent number: 9577678
    Abstract: A bit interleaver, a bit-interleaved coded modulation (BICM) device and a bit interleaving method are disclosed herein. The bit interleaver includes a first memory, a processor, and a second memory. The first memory stores a low-density parity check (LDPC) codeword having a length of 64800 and a code rate of 7/15. The processor generates an interleaved codeword by interleaving the LDPC codeword on a bit group basis. The size of the bit group corresponds to a parallel factor of the LDPC codeword. The second memory provides the interleaved codeword to a modulator for quadrature phase shift keying (QPSK) modulation.
    Type: Grant
    Filed: January 27, 2015
    Date of Patent: February 21, 2017
    Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Sung-Ik Park, Sun-Hyoung Kwon, Jae-Young Lee, Heung-Mook Kim, Nam-Ho Hur
  • Patent number: 9577861
    Abstract: The present invention provides a method for transmitting a broadcast signal. The method for transmitting the broadcast signal according to the present invention may comprise the steps of: formatting input streams into multiple data pipes (DPs); encoding data of the multiple DPs according to a code rate for each DP; generating at least one signal frame by mapping the encoded data of the multiple DPs; and modulating data of the generated signal frame in an orthogonal frequency division multiplexing (OFDM) scheme, and transmitting the broadcast signal including data of the modulated signal frame.
    Type: Grant
    Filed: May 9, 2014
    Date of Patent: February 21, 2017
    Assignee: LG ELECTRONICS INC.
    Inventors: Jongseob Baek, Byounggill Kim, Woochan Kim, Jaehyung Kim, Woosuk Ko, Sungryong Hong, Chulkyu Moon, Jinyong Choi, Jaeho Hwang, Kookyeon Kwak, Byeongkook Jeong
  • Patent number: 9444437
    Abstract: A 1/n-rate decision feedback equalizer (DFE) and method include a plurality of branches. Each branch includes a separate summer circuit configured to add a respective feedback signal to a received input and a latch configured to receive an output of the summer circuit to provide different partial bit sequences based on a clock signal. A feedback circuit includes a multiplexer configured to multiplex the different partial bit sequences of each branch to assemble a full rate bit sequence and a filter configured to provide cancellation of intersymbol interference (ISI) from the received input.
    Type: Grant
    Filed: March 27, 2015
    Date of Patent: September 13, 2016
    Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: John F. Bulzacchelli, Byungsub Kim
  • Patent number: 9439058
    Abstract: Embodiments of the claimed subject matter provide a method for supporting network monitoring of user equipment events. Some embodiments of the method include receiving, at a home subscriber server (HSS) in a public land mobile network (PLMN), a request to monitor one or more events associated with one or more users. The request is used to configure, activate, or deactivate delivery of reports from one or more entities in the PLMN to a monitor collection entity in response to the event(s). Some embodiments of the method also include configuring one or more profiles in the HSS associated with the user(s) based on the request and providing the request to monitor the event(s) associated with the user(s) to one or more serving nodes for user equipment associated with the user(s).
    Type: Grant
    Filed: March 12, 2015
    Date of Patent: September 6, 2016
    Assignee: Alcatel Lucent
    Inventors: Deborah L Barclay, Bruno Landais, Laurent Thiebaut
  • Patent number: 9264082
    Abstract: A system and method for optimally combining multi-path signals is presented. A first signal is received that traveled a first path from a transmitter to a receiving location and a second signal is received that traveled a different second path from the transmitter to the same receiving location. The paths are different so that the first and second signals contain the same signal data but the first signal has a first distortion that is different than a second distortion in the second signal. According to an objective function, the method adaptively generates a first weight value and a second weight value. The first and second weight values are applied to the respective first and second signals to produce respective first and second weighted signals. The first and second weighted signals are linearly combined producing a combined signal with a combined signal degradation.
    Type: Grant
    Filed: June 11, 2013
    Date of Patent: February 16, 2016
    Assignee: BAE Systems Information and Electronic Systems Integration Inc.
    Inventor: Gary R. Lomp
  • Patent number: 9253006
    Abstract: A method and an apparatus for transmitting broadcast signals thereof are disclosed. The apparatus for transmitting broadcast signals comprises an encoder for encoding service data, a mapper for mapping the encoded service data into a plurality of OFDM (Orthogonal Frequency Division Multiplex) symbols to build at least one signal frame, a frequency interleaver for frequency interleaving data in the at least one signal frame by using a different interleaving-seed which is used for every OFDM symbol pair comprised of two sequential OFDM symbols, a modulator for modulating the frequency interleaved data by an OFDM scheme and a transmitter for transmitting the broadcast signals having the modulated data.
    Type: Grant
    Filed: August 14, 2014
    Date of Patent: February 2, 2016
    Assignee: LG ELECTRONICS INC.
    Inventors: Jongseob Baek, Jaehyung Kim, Woosuk Ko, Sungryong Hong
  • Patent number: 9250327
    Abstract: An adaptive method by which Differential GNSS corrections may be compressed. Each measurement datum to be transmitted to a rover for satellite navigation purposes is decomposed into two parts, namely, an anchor value and a delta value, and in some instances an added third part termed a nonce value is used. Encoding parameters such as the number of bits assigned to each part of the measurement datum, the order of the models used to convey positional data, and scaling constants in the models, are adjusted adaptively based on changing data and/or transmission medium characteristics. Adaptive compression also allows for anomalous conditions such as out-of-range data values to be handled gracefully.
    Type: Grant
    Filed: March 5, 2013
    Date of Patent: February 2, 2016
    Assignee: SubCarrier Systems Corporation
    Inventors: David Charles Kelley, Gregory John Berchin
  • Patent number: 9246635
    Abstract: A method and an apparatus for transmitting broadcast signals thereof are disclosed. The apparatus for transmitting broadcast signals comprises an encoder for encoding service data, a mapper for mapping the encoded service data into a plurality of OFDM (Orthogonal Frequency Division Multiplex) symbols to build at least one signal frame, a frequency interleaver for frequency interleaving data in the at least one signal frame by using a different interleaving-seed which is used for every OFDM symbol pair comprised of two sequential OFDM symbols, a modulator for modulating the frequency interleaved data by an OFDM scheme and a transmitter for transmitting the broadcast signals having the modulated data, wherein the different interleaving-seed is generated based on a cyclic shifting value and wherein an interleaving seed is variable based on an FFT size of the modulating.
    Type: Grant
    Filed: November 11, 2014
    Date of Patent: January 26, 2016
    Assignee: LG ELECTRONICS INC.
    Inventors: Jongseob Baek, Jongwoong Shin, Jaehyung Kim, Woosuk Ko, Sungryong Hong
  • Patent number: 9203503
    Abstract: A signal repeating system includes at least one input antenna that receives input signals, at least one output antenna that radiates output signals, and a signal path between the input and output antennas. The signal path includes circuitry for conditioning the input signals with down conversion circuitry that converts input signals to lower frequency signals and analog-to-digital conversion circuitry that converts the input signals to digital signals. A suppression circuit suppresses feedback and interference in the repeated output signals with a digital signal processor configured for receiving samples of the input signals, samples of the output signals, and samples of an interference reference signal and an adaptive filter under the control of the digital signal processor for generating echo cancellation signals and interference cancellation signals.
    Type: Grant
    Filed: January 6, 2014
    Date of Patent: December 1, 2015
    Assignee: Andrew Wireless Systems GmbH
    Inventor: Thomas Kummetz
  • Patent number: 9178626
    Abstract: A signal processing method is disclosed. The method includes identifying a preferred loss profile for a plurality of signal transmission channels and generating a filter transfer function corresponding to each of the plurality of signal transmission channels, where each filter transfer function is configured to produce a filtered signal with a loss profile approximately equal to the preferred loss profile. The method further includes generating a plurality of filtered signals by filtering a plurality of signals using the filter transfer function corresponding to each of the plurality of signal transmission channels. and transmitting the plurality of filtered signals to a plurality of receivers via the plurality of signal transmission channels.
    Type: Grant
    Filed: March 14, 2013
    Date of Patent: November 3, 2015
    Assignee: Dell Products L.P.
    Inventors: Bhyrav M. Mutnury, Douglas E. Wallace
  • Patent number: 9166768
    Abstract: In order to reduce deterioration of reception performance even further in a case of simultaneously performing transmission and reception, a transmitting circuit (20), which forms a radio transceiver (1), outputs a transmission signal (110) to be wirelessly transmitted through an antenna (10). A duplexer (30) conducts the transmission signal (110) to the antenna (10), and outputs, as differential signals (102p and 102n), a reception signal wirelessly received through the antenna (10) to a receiving circuit (40). The receiving circuit (40) regulates phases of the differential signals (102p and 102n) based on a first characteristic of the reception signal under a condition that the transmission signal (110) is not output, and a second characteristic of the reception signal under a condition that the transmission signal (110) is output.
    Type: Grant
    Filed: September 7, 2011
    Date of Patent: October 20, 2015
    Assignee: NEC CORPORATION
    Inventor: Yoshiaki Ando
  • Patent number: 9137745
    Abstract: A system, method and computer product for a mobile station to locate a femto cell, the method comprising: (a) storing in a database information to locate at least one femto cell; (b) receiving, from at least one macro cell, location information of the UE; (c) searching within the database to determine if the UE is in a general proximity of at least one femto cell; (d) if so, accessing the femto cell using the database information corresponding to the femto cell.
    Type: Grant
    Filed: October 9, 2008
    Date of Patent: September 15, 2015
    Assignee: QUALCOMM Incorporated
    Inventor: Aleksandar M. Gogic
  • Patent number: 9106339
    Abstract: Embodiments of the present invention provide a coefficient determining apparatus, equalizer, receiver and transmitter. The coefficient determining apparatus comprises: a synchronizer configured to find a position of a training sequence from signals containing the training sequence received by a transmitter; and a first processor configured to set an initial tap coefficient of an equalizer according to the received signals and the training sequence; wherein in each polarization state, the training sequence comprises n pairs of training symbols, in the n pairs of training symbols, the training symbols of the same pair being identical, the training symbols of the different pair being different, a cyclic prefix and a cyclic postfix being respectively inserted before and after each pair of training symbols, and n being an integer greater than 1.
    Type: Grant
    Filed: September 13, 2013
    Date of Patent: August 11, 2015
    Assignee: FUJITSU LIMITED
    Inventors: Meng Yan, Zhenning Tao, Lei Li
  • Patent number: 9094043
    Abstract: A data processing device and a data processing method capable of improving resistance to errors. Code bits of an LDPC code with a code length N of 16200 bits is written to, for example, eight storage units. When the code bits are stored in the storage units, a process of changing the storage start position of the code bits for each storage unit is performed as a sorting process of sorting the bits of the LDPC code such that a plurality of code bits corresponding to 1s in an arbitrary row of the parity check matrix of the LDPC code are not included in a single symbol which is read from the storage units. The present technology can be applied to, for example, the transmission of the LDPC code.
    Type: Grant
    Filed: February 1, 2012
    Date of Patent: July 28, 2015
    Assignee: SONY CORPORATION
    Inventors: Yuji Shinohara, Makiko Yamamoto, Takashi Yokokawa
  • Patent number: 9042434
    Abstract: Method and filter for filtering a signal, in which the signal is applied to a delay line having a plurality of taps. Respective weighting coefficients of a windowing function are applied to outputs from the plurality of taps to thereby generate a plurality of weighted outputs. The method comprises repeatedly selecting, for output, whichever of the weighted outputs has the highest value.
    Type: Grant
    Filed: April 4, 2012
    Date of Patent: May 26, 2015
    Assignee: Intel Corporation
    Inventor: Christopher Brian Smart
  • Patent number: 9042501
    Abstract: A receiving circuit, use, and method for receiving an encoded and modulated radio signal is provided. The circuit comprise a demodulator and a digital filter connected downstream of the demodulator for moving averaging. The filter has at least two FIFO registers and subtractors. Whereby for subtracting an output value of the FIFO register from an input value of the FIFO register a subtractor is connected to each FIFO register. Wherein the filter has a weighting unit, which is connected downstream of each FIFO register, and wherein the filter has an integrator, which is connected downstream of the subtractors for integration.
    Type: Grant
    Filed: November 14, 2013
    Date of Patent: May 26, 2015
    Assignee: Atmel Corporation
    Inventor: Ulrich Grosskinsky
  • Patent number: 9042436
    Abstract: An apparatus is disclosed to compensate for non-linear effects resulting from the transmitter, the receiver, and/or the communication channel in a communication system. A receiver of the communication system contains an image cancellation module that compensates for images generated during the modulation and/or demodulation process. The image cancellation module includes a fine carrier correction loop to correct for frequency offsets between the transmitter and receiver. The image cancellation module includes a coarse acquisition mode and a decision directed mode. The decision directed mode allows for a larger signal-to-noise ratio for the receiver when compared against the coarse acquisition mode.
    Type: Grant
    Filed: March 26, 2013
    Date of Patent: May 26, 2015
    Assignee: Broadcom Corporation
    Inventors: Bruce J. Currivan, Loke Tan, Thomas Kolze, Hanli Zou, Lin He
  • Publication number: 20150139293
    Abstract: A receiving device is provided to coordinate transmissions from a first transmitting device and from a second transmitting device of a plurality of transmitting devices to the receiving device in a communication network.
    Type: Application
    Filed: September 30, 2014
    Publication date: May 21, 2015
    Inventors: Kenneth L. Stanwood, David Gell, Murat Karsi
  • Publication number: 20150139289
    Abstract: A receiver includes a fixed delay unit configured to delay a first clock signal received from a clock channel by a predetermined time and output a second clock signal; a first delay unit configured to delay the first clock signal in response to a first control signal; a first data sampler configured to sample a data signal received from a data channel in response to an output signal of the first delay unit and output a first data signal; a second delay unit configured to delay the first data signal in response to a second control signal and output a second data signal; a second data sampler configured to sample the second data signal in response to the second clock signal; and a delay controller configured to output the first control signal and the second control signal.
    Type: Application
    Filed: September 26, 2014
    Publication date: May 21, 2015
    Inventors: Han-Kyu CHI, Taek-Sang SONG, Seok-Min YE, Gi-Moon HONG, Woo-Rham BAE, Min-Seong CHU, Deog-Kyoon JEONG, Su-Hwan KIM
  • Patent number: 9031123
    Abstract: A receiver performs interference mitigation under blind or semi-blind conditions using diversity present in the signal of interest or in the interferer. A first path interference mitigation procedure extracts training information from received signals, performs interference mitigation on the training information and estimates the channel. The second path interference mitigation procedure uses data extracted from the received signal and the channel estimate to perform interference mitigation. Each interference mitigation process can take the form of a lossy compression followed by decompression.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: May 12, 2015
    Assignee: Acorn Technologies, Inc.
    Inventor: Fernando Lopez de Victoria
  • Patent number: 9031124
    Abstract: A method of generating a hypothesis and estimating a CFO includes receiving a signal including a set of radio frames, dividing each received radio frame of the set into a set of received sub-sequences, dividing, each of reference radio frames from a reference signal stored in the receiver into a set of reference sub-sequences, correlating the set of received sub-sequences with the set of reference sub-sequences to obtain a set of correlation values, generating, a first value set and a second value set of hypothesis based on the correlation values, generating a first and a second hypothesis based on the first value and the second value set, and averaging the first and the second hypothesis to obtain an averaged hypothesis, performing a DFT on the averaged hypothesis to obtain a DFT sequence, determining a peak position of the DFT sequence, and estimating the CFO based on the peak position.
    Type: Grant
    Filed: February 21, 2014
    Date of Patent: May 12, 2015
    Inventors: Shrinivas Bhat, Niranjan Mylarappa Gowda
  • Patent number: 9025651
    Abstract: Methods, systems, and devices are described for equalizing data from an optical signal. Samples are filtered with at least one filter to compensate for polarization mode dispersion in an optical path. The filtered samples may be used to determine errors based on a difference between a radius of a recovered symbol and a target radius. A parameter may be assigned to one or more of the errors and properties of the at least one filter may be updated based on the assigned parameters. The parameter may be assigned from a small set of parameters based on at least one threshold value. Outputs generated from the filtered samples may also be assigned a parameter from a different set of parameters. The parameter assigned to the output may be used to update the particular set of taps of the at least one filter from which the output was generated.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: May 5, 2015
    Assignee: ViaSat, Inc.
    Inventors: Sameep Dave, Fan Mo
  • Patent number: 9020020
    Abstract: Disclosed are various embodiments for a symbol level Krylov method equalizer implemented in a wireless communications device. An HSDPA or WCDMA signal is input to the wireless communications device. A conjugate gradient method is applied to symbol-level samples of the signal until a termination condition is met. The termination condition may comprise having zero residual error, residual error below a threshold, or a specified number of iterations. Additionally, a preconditioning matrix may be applied to the inputs of the conjugate gradient method.
    Type: Grant
    Filed: November 19, 2012
    Date of Patent: April 28, 2015
    Assignee: Broadcom Corporation
    Inventor: Chun-Hsuan Kuo
  • Patent number: 9020021
    Abstract: An apparatus for encoding data signals includes a transmitter configured to encode and transmit a data signal over a communication channel, the transmitter including a precoder; a signal shaper configured to adjust the data signal by applying an equalization setting to the data signal, the equalization setting including an amplitude and offset and transmit the adjusted data signal to the precoder; and a processing unit. The processing unit is configured to perform: receiving channel coefficients associated with the communication channel; for each of a plurality of amplitude settings and a plurality of offset settings, calculating whether a modulo amplitude level would occur at a receiver using a modulo operation; selecting the equalization setting from the plurality of amplitude settings and the plurality of offset settings based on the calculation; and transmitting a control signal specifying the equalization setting to the signal shaper.
    Type: Grant
    Filed: July 29, 2013
    Date of Patent: April 28, 2015
    Assignee: International Business Machines Corporation
    Inventors: Marcel A. Kossel, Daihyun Lim, Pradeep Thiagarajan
  • Patent number: 9020024
    Abstract: A rate-adaptive equalizer automatically initializes its tap coefficients to values. During an initialization process, a linear search algorithm is performed that sweeps the tap coefficients through different combinations of tap coefficients while assessing information about an eye associated with an input signal received over a communications channel. When the eye information indicates that the eye is open, the current tap coefficients are selected as the initial tap coefficients to be used at the beginning of the main adaptation algorithm.
    Type: Grant
    Filed: October 31, 2013
    Date of Patent: April 28, 2015
    Assignee: Avego Technologies General IP (Singapore) Pte. Ltd.
    Inventors: Faouzi Chaahoub, Georgios Asmanis, Sriramkumar Sundararaman, Samir Aboulhouda
  • Patent number: 9020023
    Abstract: The present technique relates to a reception device and a reception method which can improve equalization performance. An equalization processing unit has a time domain equalization unit which equalizes a received signal in a time domain and a frequency domain equalization unit which is provided in parallel to the time domain equalization unit and which equalizes the received signal in a frequency domain, and performs control of switching between the time domain equalization unit and the frequency domain equalization unit. The present technique can be applied to, for example, equalize a signal of data transmitted by way of single carrier transmission or data transmitted by way of multicarrier transmission.
    Type: Grant
    Filed: May 15, 2012
    Date of Patent: April 28, 2015
    Assignee: Sony Corporation
    Inventors: Katsumi Takaoka, Naoki Yoshimochi, Hidetoshi Kawauchi, Ryo Hasegawa, Hirofumi Maruyama
  • Patent number: 9014254
    Abstract: Testing a Decision Feedback Equalizer (‘DFE’), the DFE including a summing amplifier operatively coupled to a plurality of latches and an input signal line for receiving a data signal, including: preventing a differential data signal from being received by the summing amplifier; and iteratively for each tap to be tested: setting a tap coefficient for each tap to zero; setting an output of the plurality of latches to a predetermined value; setting a tap coefficient for the tap to be tested to a full scale value; and determining whether a resultant output signal from the DFE matches a predetermined expected output signal.
    Type: Grant
    Filed: June 19, 2013
    Date of Patent: April 21, 2015
    Assignee: International Business Machines Corporation
    Inventors: Eugene R. Atwood, Matthew B. Baecher, Minhan Chen, Hayden C. Cranford, Jr., William R. Kelly, Todd M. Rasmus
  • Patent number: 8995519
    Abstract: Generating updated coefficients for an adaptive equalizer involves generating phase tracking information using asynchronous detection strategy (ADS) based on resolved data, and equalized signals, and estimating a phase corrected error based on the equalized signals, the phase tracking information and the resolved data. An inhibit signal is generated to inhibit updating of the equalization coefficients, the inhibit signal representing a likelihood of the phase corrected error being accurate, determined according to the phase corrected error, and the equalized signals. The equalization coefficients for the equalizer are adapted based on the received signals, and on the phase corrected error, and the adapting is inhibited according to the inhibit signal. Compared to conventional ADS, the new combination with the inhibit signal can enable improved convergence of coefficient adaptation. This is particularly useful for coherent receivers for optical systems.
    Type: Grant
    Filed: October 15, 2010
    Date of Patent: March 31, 2015
    Assignee: Telefonaktiebolaget L M Ericsson (Publ)
    Inventors: Tommaso Foggi, Giulio Colavolpe
  • Patent number: 8989729
    Abstract: Embodiments of the claimed subject matter provide a method for supporting network monitoring of user equipment events. Some embodiments of the method include receiving, at a home subscriber server (HSS) in a public land mobile network (PLMN), a request to monitor one or more events associated with one or more users. The request is used to configure, activate, or deactivate delivery of reports from one or more entities in the PLMN to a monitor collection entity in response to the event(s). Some embodiments of the method also include configuring one or more profiles in the HSS associated with the user(s) based on the request and providing the request to monitor the event(s) associated with the user(s) to one or more serving nodes for user equipment associated with the user(s).
    Type: Grant
    Filed: November 9, 2012
    Date of Patent: March 24, 2015
    Assignee: Alcatel Lucent
    Inventors: Deborah L. Barclay, Bruno Landais, Laurent Thiebaut
  • Patent number: 8989253
    Abstract: A technique for a reconditioning equalizer filter for non-constant envelope signals is described. The input to a transmitter chain is modified by a reconditioning equalizer filter, prior to being applied to the transmitter. The reconditioning equalizer filter modifies and smoothens the amplitude of the signal. The modified and smoothened signal has its peaks reduced which results in lower Crest Factor. The input to the reconditioning equalizer filter could be a baseband, intermediate frequency (IF) or radio frequency (RF) signal. When the signal is an IF or RF signal, it needs to be down-converted to baseband before being applied to the reconditioning equalizer filter. The reconditioning equalizer filter could be performed in a digital or analog domain.
    Type: Grant
    Filed: June 17, 2014
    Date of Patent: March 24, 2015
    Assignee: Altera Corporation
    Inventor: Kiomars Anvari
  • Publication number: 20150078428
    Abstract: A method includes providing a plurality of sets of equalizer taps, wherein each set is coupled to a respective one of a plurality of antenna ports; assigning a first plurality of equalizer taps of the sets of equalizer taps to a first subset; determining a first covariance measure associated with the first plurality of equalizer taps of the first subset based on a first correlation criterion; assigning a second plurality of equalizer taps of the sets of equalizer taps to a second subset; and determining a second covariance measure associated with the second plurality of equalizer taps of the second subset based on a second correlation criterion.
    Type: Application
    Filed: September 13, 2013
    Publication date: March 19, 2015
    Applicant: Intel IP Corporation
    Inventor: Rajarajan BALRAJ
  • Patent number: 8982939
    Abstract: Described herein is an apparatus, method and system corresponding to relate to a low power digital phase interpolator (PI). The apparatus comprises: a digital mixer unit to generate phase signals from a series of input signals, the phase signals having phases which are digitally controlled; a poly-phase filter, coupled to the digital mixer unit, to generate a filtered signal by reducing phase error in the phase signals; and an output buffer, coupled to the poly-phase filter, to generate an output signal by buffering the filtered signal. The low power digital PI consumes less power compared to traditional current-mode PIs operating on the same power supply levels because the digital PI is independent of any bias circuit which are needed for current mode PIs.
    Type: Grant
    Filed: December 21, 2011
    Date of Patent: March 17, 2015
    Assignee: Intel Corporation
    Inventor: Hongjiang Song
  • Patent number: 8976854
    Abstract: A reconfigurable P-way parallel N-tap feed forward equalizer includes an adaptive filter configured to generate a series of coefficients (taps) and an input register for storing input symbols. A variable cursor position defined by a parameter corresponding to a position in the input register selects a set of pre-cursor and post-cursor taps for dynamic ISI correction of a like set of pre-cursor and post-cursor symbols. Multiplier banks generate partial result symbols by applying the taps to the set of input symbols, and a set of combiners or adder banks generate equalized output symbols from the partial result symbols. Two multiplexers adjust input symbols and coefficients according to the parameter, and a controller allows selection of an optimal parameter, and thus an optimal variable cursor position. The coefficient corresponding to the parameter may additionally be preset to save storage space.
    Type: Grant
    Filed: February 28, 2014
    Date of Patent: March 10, 2015
    Assignee: LSI Corporation
    Inventors: Adam B. Healey, Tomasz Prokop, Volodymyr Shvydun, Chaitanya Palusa
  • Publication number: 20150062732
    Abstract: Systems and method relating generally to data processing, and more particularly to systems and methods for tone reduction in relation to data transmission.
    Type: Application
    Filed: September 12, 2013
    Publication date: March 5, 2015
    Applicant: LSI Corporation
    Inventors: Nayak Ratnakar Aravind, Bruce A. Wilson, Lu Pan, Haitao Xia