Diversity (frequency Or Time) Patents (Class 375/347)
  • Patent number: 9225573
    Abstract: Systems and methods for transmitting and receiving OFDM symbols are provided which enable the otherwise wasted transmission time normally used as a prefix for each OFDM symbol to contain useful information. At the receiver, the received signal is processed to convert received OFDM symbols from a linear convolution with the channel to a cyclic convolution.
    Type: Grant
    Filed: January 25, 2011
    Date of Patent: December 29, 2015
    Assignee: APPLE INC.
    Inventors: Shiquan Wu, Wen Tong, Claude Royer, Peiying Zhu
  • Patent number: 9226297
    Abstract: In one embodiment, a method for network entry in a wireless communication system includes acquiring ranging code configuration information, which represents the corresponding relationship among multiple beam vectors, multiple ranging sequences, and multiple ranging channels, determining an optimal downlink beam vector, and transmitting one of the ranging sequences corresponding to the optimal downlink beam vector to a Base Station (BS) through one of the ranging channels corresponding to the optimal downlink beam vector.
    Type: Grant
    Filed: June 22, 2012
    Date of Patent: December 29, 2015
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Shuangfeng Han
  • Patent number: 9225567
    Abstract: A receiver simultaneously receives a plurality of signals on a plurality of channels, which have been modulated using frequency shift keying (FSK). A calculation range controller detects a Mark frequency and a Space frequency for each channel, determines for each channel a frequency range for Fourier transform calculation of the plurality of receiving signals, based on the detected Mark frequency and the detected Space frequency and indicates the frequency range to a frequency component detector. The frequency component detector performs Fourier transformation on the determined frequency range for each channel and detects, for each channel, frequency components (FFT signals) of the plurality of receiving signals respectively. The channel shifter allocates the FFT signals output from the frequency component detector to data of channel 1 to channel N and outputs the signals to respective demodulators.
    Type: Grant
    Filed: February 16, 2015
    Date of Patent: December 29, 2015
    Assignee: Panasonic Corporation
    Inventor: Masahiko Sagisaka
  • Patent number: 9219627
    Abstract: A circuit, including a receiving path, for converting a first analog radio frequency (RF) input signal to a digital intermediate frequency (IF) input signal, wherein the first analog RF input signal includes a first signal component conforming to a first wireless transmission standard and a second signal component conforming to a second wireless transmission standard; a first digital down converter, for receiving and processing the digital IF input signal to generate a first digital baseband signal corresponding to the first signal component; a second digital down converter, for receiving and processing the digital IF input signal in order to generate a second digital baseband signal corresponding to the second signal component; a first baseband processing module, for processing the first digital baseband signal according to the first wireless transmission standard; and a second baseband processing module, for processing the second digital baseband signal according to the second wireless transmission standard
    Type: Grant
    Filed: March 5, 2014
    Date of Patent: December 22, 2015
    Assignee: MStar Semiconductor, Inc.
    Inventors: Shih-Chieh Yen, Yao-Chi Wang
  • Patent number: 9215702
    Abstract: The present invention provides a method and an apparatus for processing data and a base station. The method includes: receiving first service data sent by a first radio frequency device, where the first service data are received by at least one receiving set of the first radio frequency device; receiving at least one second service data sent by at least one second radio frequency device, where the at least one second service data are respectively received by at least one receiving set corresponding to the at least one second radio frequency device; and transferring the first service data and the at least one second service data to a baseband processing device through a baseband processing device channel corresponding to the first radio frequency device. The solution according to embodiments of the present invention is capable of effectively using channel resources of a baseband processing device.
    Type: Grant
    Filed: January 11, 2013
    Date of Patent: December 15, 2015
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Zhitao Guo, Binlin Jiang, Lichang Wu, Aihua Hu
  • Patent number: 9209885
    Abstract: An exemplary system comprises at least one antenna, first and second signal paths, and an N-plexer. The first antenna may be configured to receive first and second diversity received signals. The first signal path may have a first converter configured to convert the first diversity received signal to first carrier group. The second signal path may have a second converter configured to convert the second diversity received signal to a second carrier group. The N-plexer may be configured to provide the first and second diversity received signals to a first cable in communication with a first modem.
    Type: Grant
    Filed: September 23, 2014
    Date of Patent: December 8, 2015
    Assignee: Aviat U.S., Inc.
    Inventors: Paul A. Kennard, Sergio Licardie
  • Patent number: 9203679
    Abstract: A low latency transmitter and receiver for an OFDM system are disclosed. The low latency transmitter includes an FFT module and a baseband modulator. The FFT module computes IDFT of PSK constellation data symbols or QAM constellation data symbols. The baseband modulator performs complex modulation of the IDFT samples by multiplying these samples with 1 and ?1 alternatively in time domain. The low latency receiver includes a baseband demodulator and another FFT module. The baseband demodulator performs complex demodulation of the received samples of OFDM symbols by multiplying the samples of OFDM symbols with 1 and ?1 alternatively in time domain thereby obtaining baseband demodulated symbols. The FFT module of the receiver computes DFT of samples of the baseband demodulated symbols to obtain samples of the OFDM demodulated symbols.
    Type: Grant
    Filed: May 22, 2013
    Date of Patent: December 1, 2015
    Assignee: INTERRA SYSTEMS, INC.
    Inventor: Nanda Kishore Chavali
  • Patent number: 9203482
    Abstract: To reduce costs in multiple-input multiple-output (MIMO) and other wireless communication systems an arrangement is described whereby adaptive combination is used at user equipment in order to produce two or more directional antenna beams. Improvements in carrier to interference levels result.
    Type: Grant
    Filed: February 27, 2006
    Date of Patent: December 1, 2015
    Assignee: Apple Inc.
    Inventors: Martin Smith, Dawn Power, Sonya Amos, Dean Kitchener
  • Patent number: 9203466
    Abstract: System(s) and method(s) are provided to facilitate generating and processing acquisition pilots in wireless communications. Acquisition pilots that convey timing and frequency synchronization information, wireless system acquisition and system determination information are modulated with pseudorandom sequences. The R bits of information carried by the acquisition pilot that conveys system determination information are augmented with T bits that convey a counter index associated with the system timing of superframes transmitted from an access point. The processing overhead resulting from the addition of the T bits is offset by the advantages afforded to a wireless communication. Salient advantages include: (i) processing gain at a receiver for communication in a specific sector during asynchronous operation, (ii) packet boundary determination through the counter field values, and (iii) initialization of various pseudorandom registers employed for communication.
    Type: Grant
    Filed: October 24, 2007
    Date of Patent: December 1, 2015
    Assignee: QUALCOMM Incorporated
    Inventors: Alexei Gorokhov, Aamod Khandekar, Michael Mao Wang
  • Patent number: 9190715
    Abstract: A system and method for antenna radiation pattern sweeping in wireless networks, e.g., cellular networks, are disclosed. For example, the system comprises a first base station associated with a first antenna assembly for providing a first antenna radiation pattern over a first footprint of a first cell, a second base station associated with a second antenna assembly for providing a second antenna radiation pattern over a second footprint of a second cell, wherein there is an overlap between the first footprint and the second footprint, and a controller for controlling the first base station and the second base station to continuously provide a variation of the first antenna radiation pattern and the second antenna radiation pattern in a co-ordinated manner for maintaining the overlap between the first footprint and the second footprint.
    Type: Grant
    Filed: January 19, 2011
    Date of Patent: November 17, 2015
    Assignee: Quintel Technology Limited
    Inventors: David Edwin Barker, Keith Hal Radousky
  • Patent number: 9178729
    Abstract: A wireless communication apparatus includes a wireless section configured to receive a plurality of signals via a plurality of antennae from a transmitting device having another plurality of antennae; and a demodulation section configured to apply QR decomposition to a channel matrix generated based on the received signals from the wireless section, to extract a plurality of weight coefficients corresponding to a symbol to be demodulated from a unitary matrix Q, to filter the received signals weighted with the weight coefficients, and to separate the filtered received signals based on a submatrix of an upper triangular matrix R.
    Type: Grant
    Filed: August 21, 2013
    Date of Patent: November 3, 2015
    Assignee: FUJITSU LIMITED
    Inventor: Tsuyoshi Hasegawa
  • Patent number: 9166630
    Abstract: An illustrative adaptive radio communications system comprises a cluster of waveform and application processor entities coupled and a plurality of transceivers. The transceivers convert radio frequency (RF) signals into digital in-phase and quadrature (I/Q) data, which is sent to the waveform processor entities via a network fabric. The waveform processor entities perform low-level waveform processing and the application processor entities perform high-level, distributed signal processing. The system and related methods are capable of processing multiple programmable waveforms of varying complexity.
    Type: Grant
    Filed: July 22, 2014
    Date of Patent: October 20, 2015
    Assignee: Raytheon Company
    Inventors: Kenneth V. Miller, Paul R. Work
  • Patent number: 9160438
    Abstract: A digital broadcast receiver receives a digital broadcast signal through a plurality of antennas, orthogonally demodulates the received signals, performs channel estimation by detecting a delay profile from a known signal included in each of the orthogonally demodulated signals, and uses the channel estimation results to equalize data signals included in the orthogonally demodulated signals. The delay profiles are also used to estimate the signal quality of each of the equalized data signals by determining the power of the signal component and the power of the noise component in each delay profile and calculating a signal to noise ratio. Diversity combining is performed by weighting the equalized data signals on a basis of their estimated signal quality.
    Type: Grant
    Filed: July 3, 2014
    Date of Patent: October 13, 2015
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Aki Kaizu, Yukihiro Kadota, Tsutomu Asahina, Daisuke Shimbo
  • Patent number: 9160577
    Abstract: Systems and methods of receiving data in a communication system are disclosed. The methods include equalizing a plurality of samples to suppress intersymbol interference and provide a first set of detected bits based on a first set of reference bits comprising a training sequence on a first iteration. The methods further include suppressing co-channel interference in the plurality of input samples and provide a set of suppressed samples based on a second set of reference bits comprising the first set of detected bits on a second iteration. The methods further include equalizing the set of suppressed samples to suppress intersymbol interference and provide a second set of detected bits based on the second set of reference bits on the second iteration.
    Type: Grant
    Filed: April 30, 2009
    Date of Patent: October 13, 2015
    Assignee: QUALCOMM Incorporated
    Inventors: Divaydeep Sikri, Farrokh Abrishamkar, Nico De Laurentiis
  • Patent number: 9157983
    Abstract: This system and method provides a direction finding system that enables modern RF DF systems to analyze short duration signals in the entire instantaneous bandwidth. By providing a method to process wideband data, the invention drastically improves throughput and probability of intercept (POI). The invention is unique in that it does not require separate narrowband channels for analysis, and can simultaneously calculate azimuth and elevation estimates for every frequency in the bandwidth of an incident signal. It is also well-suited for fixed point, FPGA implementations making it a perfect match for modern state-of-the-art processing systems. The system and method capitalizes on the ability of Fourier Frequency Transform operations to accurately resolve incident wave phase at discrete frequencies. The system then uses the phase information from the individual elements in the array to arrive at an emitter azimuth angle.
    Type: Grant
    Filed: October 17, 2012
    Date of Patent: October 13, 2015
    Assignee: SPECTRANETIX, INC.
    Inventor: Lars Karlsson
  • Patent number: 9154342
    Abstract: The present document discloses an apparatus and method for cancelling in-band interference in a cellular telecommunication system which using multiple-input multiple-output technique. The method includes: receiving a transmitted signal and obtaining an interfering data stream; calculating a value of a credit; deciding whether the credit is above a predefined threshold; regenerating an interference signal by using the interfering data stream if the credit is above the predefined threshold; subtracting the regenerated interference signal from the received transmitted signal to obtain a target signal; and demodulating and decoding the target signal. By using the apparatus and method, the concerned signal can be regenerated even when there is only small number of error bits while all the other bits are correctly decoded. Also, the target stream would be able to know whether the interfering stream can be regenerated or not, before the decoding.
    Type: Grant
    Filed: May 9, 2012
    Date of Patent: October 6, 2015
    Assignee: ZTE Wistron Telecom AB
    Inventors: Aijun Cao, Thorsten Schier, Yonghong Gao
  • Patent number: 9154201
    Abstract: A method of the multiple input multiple output feedback is disclosed. In accordance with an embodiment of the invention, the multiple input multiple output feedback method includes a receiver receiving a reference signal from a base station and calculating a signal to interference and noise ratio from the received reference signal. The method further includes determining a modulation and coding scheme based on the signal to interference and noise ratio and a receiver type.
    Type: Grant
    Filed: August 27, 2014
    Date of Patent: October 6, 2015
    Assignee: Intel Deutschland GmbH
    Inventors: Syed Aon Mujtaba, Xiaowen Wang
  • Patent number: 9143212
    Abstract: Channel state information (CSI) feedback in a wireless communication system is disclosed. User equipment transmits a CSI feedback signal via a Physical Uplink Control CHannel (PUCCH). If the UE is configured in a first feedback mode, the CSI comprises a first report jointly coding a Rank Indicator (RI) and a first precoding matrix indicator (PMI1), and a second report coding Channel Quality Indicator (CQI) and a second precoding matrix indicator (PMI2). If the UE is configured in a second feedback mode, the CSI comprises a first report coding RI, and a second report coding CQI, PMI1 and PMI2. The jointly coded RI and PMI1 employs codebook sub-sampling, and the jointly coding PMI1, PMI2 and CQI employs codebook sub-sampling.
    Type: Grant
    Filed: February 21, 2014
    Date of Patent: September 22, 2015
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventors: Runhua Chen, Eko Onggosanusi, Ralf Bendlin
  • Patent number: 9144012
    Abstract: A multiple-input multiple-output (MIMO) receiver includes a receive path circuitry configured to receive a first signal from a first antenna and a second signal from a second antenna, downconvert the first signal to a first frequency to generate a first intermediate frequency (IF) signal, downconvert the second signal to a second frequency different from the first frequency to generate a second IF signal, and combine the first IF signal and the second IF signal into a common signal.
    Type: Grant
    Filed: September 23, 2010
    Date of Patent: September 22, 2015
    Assignee: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Michael Lee Brobston, Breck Wayne Lovinggood, Vinh Huy Bui
  • Patent number: 9136919
    Abstract: A system for extending coverage of a wireless Internet service by using a mobile communication network is provided. The system includes a wireless access point, a combiner, and a distributor. The combiner is connected to the wireless access point. The combiner includes a filter that isolates a signal band of a wireless Internet signal corresponding to the wireless access point and a signal band of a mobile communication signal corresponding to the mobile communication network. After isolation, the combiner outputs the wireless Internet signal or the mobile communication signal. The distributor is connected to the combiner and at least one antenna. The distributor receives the wireless Internet signal from the combiner and outputs the received wireless Internet signal via the antenna.
    Type: Grant
    Filed: December 7, 2012
    Date of Patent: September 15, 2015
    Assignee: KT CORPORATION
    Inventors: Jung Ho Lee, Young Rae Kim, Yong Bum Kim, Hyang Sig Kim
  • Patent number: 9136950
    Abstract: An exemplary system may comprise a first and second device and a first and second power splitter coupled to a single cable. The first device may be configured to receive a first noise signal of a first polarization, and to adaptively cancel, based on the first noise signal, first noise from the noisy signal associated with an orthogonal polarization. The second device may be configured to receive a second noise signal of a second polarization, and to adaptively cancel second noise from the noisy signal associated with an orthogonal polarization based on the second noise signal. The first power splitter may be configured to receive the first noise signal from the single cable and provide the first noise signal to the first device. The second power splitter may be configured to receive the second noise signal from the single cable and provide the second noise signal to the second device.
    Type: Grant
    Filed: October 21, 2014
    Date of Patent: September 15, 2015
    Assignee: Aviat U.S., Inc.
    Inventor: Emerick Vann
  • Patent number: 9118375
    Abstract: Block-encoded transmissions of a multi-antenna terminal unit are effectively detected in the presence of co-channel interfering transmissions when the base station has a plurality of antennas, and interference cancellation is combined with maximum likelihood decoding. More specifically, the signals received at the base station antennas are combined in a linear combination that relates to the channel coefficients between the various transmitting terminal units and the base antennas. By selecting proper coefficients for the linear combination and choosing probable transmitted signals that minimize a minimum mean squared error function, the signals of the various terminal units are canceled when detecting the signal of a particular unit. In another embodiment of the invention, the basic approach is used to obtain an initial estimate of the signals transmitted by one terminal unit, and the contribution of those signals is removed from the received signals prior to detecting the signals of other terminal units.
    Type: Grant
    Filed: March 8, 2013
    Date of Patent: August 25, 2015
    Assignee: AT&T Intellectual Property II, L.P.
    Inventors: Ayman F. Naguib, Nambirajan Seshadri
  • Patent number: 9118446
    Abstract: A user equipment (UE) and a method are presented. The UE comprises a receiver unit and a processing circuit, and is configured for receiving wireless signals. The processing circuit is arranged for performing pre-detection of the received signals providing an initial estimation of transmitted signals. The processing circuit is also arranged for splitting the transmitted signal into disjoint subgroups, each one covering a subgroup of all layers used for the transmitted signal such that the subgroups together cover all the layers. The processing circuit is also arranged for interference cancellation performed on the subgroups of transmitted signals based on the initial estimation of the transmitted signals. The processing circuit is also arranged for detection of the subgroups of transmitted signals by utilization of an MLD algorithm, wherein the subgroup of layers within each one of the subgroups of transmitted signals is detected simultaneously.
    Type: Grant
    Filed: September 19, 2013
    Date of Patent: August 25, 2015
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Sha Hu, Fredrik Rusek, Gengshi Wu, Shashi Kant, Basuki Endah Priyanto, Jianjun Chen
  • Patent number: 9112551
    Abstract: A node in a wireless communication system comprising an antenna array with at least a first antenna function and a second antenna function. The node further comprises a first radio chain and a second radio chain, where each antenna function is connected to a base band via a corresponding radio chain. Each radio chain comprises an oscillator, a splitter and a multiplexer, each oscillator being arranged to feed a signal with a unique frequency band to the splitter in the same radio chain. The splitter is arranged to divide the signal into at least two signal parts and feed each part to the multiplexer of each radio chain such that each multiplexer in the node receives signal parts from each splitter in the node. The splitter is arranged to weight the division of the signal into the signal parts in dependence of the frequency bands fed by each oscillator.
    Type: Grant
    Filed: November 15, 2010
    Date of Patent: August 18, 2015
    Assignee: TELEFONAKTIEBOLAGET L M ERICSSON (PUBL)
    Inventors: Andreas Nilsson, Patrik Persson, Sven Petersson
  • Patent number: 9113475
    Abstract: A method includes, in a receiver that includes an uncompensated crystal oscillator, receiving signals from a transmitter by activating the receiver periodically at intervals corresponding to a specified wake-up time period. In response to detecting at the receiver that the specified wake-up time period is insufficient for maintaining synchronization between the receiver and the transmitter using the uncompensated crystal oscillator, an actual wake-up time period, smaller than the specified wake-up time period, is selected. The receiver is activated periodically according to the selected actual wake-up time period.
    Type: Grant
    Filed: April 2, 2014
    Date of Patent: August 18, 2015
    Assignee: MARVELL WORLD TRADE LTD.
    Inventor: David Ben-Eli
  • Patent number: 9106472
    Abstract: A method is provided for estimating channel state information in an in-band on-channel radio signal including a plurality of digitally modulated reference subcarriers. The method includes: receiving symbols transmitted on the reference subcarriers; combining the reference subcarrier symbols with a known reference sequence conjugate to produce a plurality of samples; median filtering the samples to produce filtered samples; smoothing the samples for each of the reference subcarriers over the plurality of reference subcarriers to produce a complex channel gain estimate for each of the subcarriers; and using a bias correction function to compensate for estimation bias error in the complex channel gain estimate due to the median filtering. Receivers that implement the method are also provided.
    Type: Grant
    Filed: June 27, 2014
    Date of Patent: August 11, 2015
    Assignee: iBiquity Digital Corporation
    Inventors: Brian W. Kroeger, Paul J. Peyla
  • Patent number: 9094156
    Abstract: A method of transmitting, by a transmitter, information in a wireless communication system, the method includes generating first and second symbols; generating first and second transmit vectors on the basis of an Alamouti code from the first and second symbols; and transmitting the first transmit vector through a first antenna and transmitting the second transmit vector through a second antenna. The first transmit vector consists of a first transmit symbol and a second transmit symbol. The second transmit vector consists of a third transmit symbol and a fourth transmit symbol. The first, second, third, and fourth transmit symbols are transmitted based on first and second resource indexes. The first symbol is a first modulation symbol for first information, and the second symbol is a second modulation symbol for second information.
    Type: Grant
    Filed: February 19, 2015
    Date of Patent: July 28, 2015
    Assignee: LG ELECTRONICS INC.
    Inventors: Seung Hee Han, Moon Il Lee, Yeong Hyeon Kwon, Hyun Soo Ko, Ja Ho Koo, Dong Cheol Kim, Jae Hoon Chung, Sung Ho Moon, Jin Sam Kwak, Min Seok Noh, Hyun Woo Lee
  • Patent number: 9094062
    Abstract: Methods and systems for processing signals in a receiver are disclosed herein and may comprise generating at least one control signal that may be utilized to control a first received signal. A phase of the first received signals may be adjusted via the generated control signal so that the phase of the first received signal may be equivalent to a phase of a second received signal, where the phase of the first signal may be adjusted within a processing path used to process the first received signal. An amplitude of the first received signal may be adjusted via the generated control signal so that the amplitude of the first received signal may be equivalent to an amplitude of a second received signal, where the amplitude of the first signal is adjusted within the processing path used to process the first received signal.
    Type: Grant
    Filed: March 5, 2013
    Date of Patent: July 28, 2015
    Assignee: Broadcom Corporation
    Inventors: Mark Kent, Vinko Erceg, Uri Landau, Pieter Van Rooyen
  • Patent number: 9077494
    Abstract: A processor (110) is disclosed for processing a plurality of Fourier-transformed instances of a symbol, each instance being comprised in one of a plurality of frequency-divided multiplexed subcarriers, said processor being arranged to estimate, for each instance, the channel gain and the inter-carrier interference contribution to said symbol from neighboring subcarriers due to a time-varying channel response of the received signal, and combine the instances into a single representation of said symbol based on the estimated channel gain and the inter-carrier interference contributions. A receiver comprising such a processor and a method for processing such signals are also disclosed.
    Type: Grant
    Filed: March 19, 2010
    Date of Patent: July 7, 2015
    Assignee: NXP, B.V.
    Inventors: Semih Serbetli, Andries Pieter Hekstra
  • Patent number: 9071312
    Abstract: A wireless communication apparatus of the present invention comprises a plurality of branches, a tap output combining section, an adaptive blind processing section and a diversity combining section. Each of the plurality of branches comprises a tap processing section generates a tap output signal and a received signal vector on a basis of a received signal and a tap coefficient in a space diversity method. The tap output combining section calculates by linking the tap output signal as a tap output combination signal. The adaptive blind processing section generates the tap coefficient by an adaptive blind processing on a basis of the tap output combination signal and the received signal vector. The diversity combining section performs a diversity combination of the tap output signals. The adaptive blind processing section uses an evaluation condition so that the tap output combination signal be minimal.
    Type: Grant
    Filed: November 24, 2011
    Date of Patent: June 30, 2015
    Assignee: NEC CORPORATION
    Inventor: Tsuguo Maru
  • Patent number: 9072082
    Abstract: Systems and methods for improved communications using tunneled direct link setup are described herein. The systems and methods relate to discovery, link setup, channel switching, multicasting, link selection, and quality of service implemented in conjunction with tunneled direct link setup.
    Type: Grant
    Filed: July 29, 2011
    Date of Patent: June 30, 2015
    Assignee: QUALCOMM Incorporated
    Inventors: Ashwani Dwivedi, Deepak Jindal Kumar
  • Patent number: 9071318
    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: Grant
    Filed: September 13, 2013
    Date of Patent: June 30, 2015
    Assignee: Intel IP Corporation
    Inventor: Rajarajan Balraj
  • Patent number: 9042491
    Abstract: This disclosure provides systems, methods, and apparatus for receiving paging messages in fast fading scenarios. In one aspect, a method of demodulating a paging message during an assigned time slot by a wireless communications apparatus operating in an idle mode is provided. The method includes determining, in anticipation of the assigned time slot, an expected time position corresponding to a path of a pilot signal having a greater signal strength relative to other pilot signals. The method further includes assigning a first demodulation element to demodulate the pilot signal with reference to the expected time position and assigning a second demodulation element to demodulate the pilot signal with reference to a time offset from the expected time position. Other aspects, embodiments, and features are also claimed and described.
    Type: Grant
    Filed: January 17, 2013
    Date of Patent: May 26, 2015
    Assignee: QUALCOMM Incorporated
    Inventors: Bhaskara V. Batchu, Priyangshu Ghosh
  • Patent number: 9042476
    Abstract: Disclosed are methods and a device for Multi-resolution PMI Feedback. In one implementation, a user equipment finds a rank 1 or rank 2 Precoding Matrix Indicator based on the signal channel matrix and interference covariance matrix, defines an error vector, obtains an orthonormal basis for the projection matrix, finds the (M?1)-dimensional vector from a codebook (e.g., oversampled Discrete Fourier Transform) with the minimum Euclidean distance, and sends a feedback representing to the base station regarding the vector that it found in the codebook.
    Type: Grant
    Filed: September 24, 2013
    Date of Patent: May 26, 2015
    Assignee: Google Technology Holdings LLC
    Inventor: Sandeep H. Krishnamurthy
  • Patent number: 9042497
    Abstract: A system that incorporates the subject disclosure may include, for example, a process that includes adjusting a filter in electrical communication between an input terminal and a demodulator. The filter is applied to an information bearing signal, e.g., to mitigate interference, received at the input terminal, resulting in a filtered signal. An error signal is received, indicative of errors detected within information obtained by demodulation of a modulated carrier of the filtered signal. A modified filter state is determined in response to the error signal and the filter is adjusted according to the modified filter state, e.g., to improve mitigation of the interference. Other embodiments are disclosed.
    Type: Grant
    Filed: August 9, 2013
    Date of Patent: May 26, 2015
    Assignee: ISCO International, LLC
    Inventors: Amr Abdelmonem, Mikhail Galeev, Sean S. Cordone, Howard Wong
  • Publication number: 20150139370
    Abstract: An integrated circuit includes a first port for conducting a first plurality of signals, a second port for conducting a second plurality of signals, a data path coupled between the first port and the second port, a controller, and a processor having an input and an output. In a first mode, the controller causes the data path to conduct at least one signal received on the first port to the second port. In a second mode, the controller controls the processor to output signals to the second port.
    Type: Application
    Filed: November 18, 2013
    Publication date: May 21, 2015
    Applicant: Silicon Laboratories Inc.
    Inventors: Scott Thomas Haban, Wei Han, Younes Djadi, Carroll S. Vance
  • Patent number: 9037103
    Abstract: A method for processing a radio signal includes: receiving a signal on two antennas; demodulating the signal using first and second independent signal paths that are synchronized by symbol number; maximum ratio combining branch metrics from the two receiver paths; and using the combined branch metrics to produce an output, wherein the receiver paths include an arbitration scheme. A receiver that implements the method is also provided.
    Type: Grant
    Filed: June 5, 2014
    Date of Patent: May 19, 2015
    Assignee: iBiquity Digital Corporation
    Inventors: Brian W. Kroeger, Paul J. Peyla, Jeffrey S. Baird
  • Patent number: 9036684
    Abstract: Compressive sampling is used to generate pilot symbols to be transmitted over an array of antennas in a MIMO wireless communications device. A pilot symbol is transmitted over the array of antennas according to a spatially randomized antenna transmission function that randomly changes across the array of antennas. The randomized antenna transmission function may randomly select/deselect antennas and/or randomly change amplitude and/or phase of the pilot symbol transmission. Channel estimates can be constructed at a receiver based on the spatially randomized pilot symbols that were transmitted.
    Type: Grant
    Filed: September 28, 2011
    Date of Patent: May 19, 2015
    Assignee: Telefonaktiebolaget L M Ericsson (publ)
    Inventors: Dennis Hui, Kumar Balachandran, Jung-Fu Cheng, Jiann-Ching Guey
  • 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: 9031146
    Abstract: Power control for devices having multiple transmit antennas are disclosed, including power control methods for Physical Uplink Control Channel (PUCCH) and Sounding Reference Signal (SRS) transmissions for a wireless transmit/receive unit (WTRU). The PUCCH and SRS power control methods include selecting a multiple input multiple output (MIMO) mode and changing the power of the PUCCH or SRS transmission based on the selected MIMO mode. Another power control method estimates an antenna gain imbalance (AGI) for a WTRU having at least two transmit antennas. The AGI is based on measuring a Reference Signal Received Power (RSRP) on each transmit antenna. Each transmit antenna is then scaled by an AGI scaling factor based on the estimated AGI.
    Type: Grant
    Filed: September 30, 2010
    Date of Patent: May 12, 2015
    Assignee: Interdigital Patent Holdings, Inc.
    Inventors: Sung-Hyuk Shin, Janet A. Stern-Berkowitz, Chang-Soo Koo, Mihaela C. Beluri
  • Patent number: 9031117
    Abstract: Techniques for handling fingers with large delay spread through utility optimization are described. A first signal may be received, through a finger of a plurality of fingers in a receiver, at a time that is later than a reference time after a reference signal is received by a reference finger of the plurality of fingers. The reference signal may be included in an on-time group corresponding to a cell. The first signal may be included in a late group corresponding to a virtual cell. The first signal and the reference signal may be compared to one another. Based on the comparing, it may be determined whether to wait for additional signals in the late group or process the signals in the on-time group.
    Type: Grant
    Filed: October 31, 2013
    Date of Patent: May 12, 2015
    Assignee: QUALCOMM Incorporated
    Inventors: Tao Cui, Wei Zhang, Guang Xie
  • Patent number: 9031173
    Abstract: A receiving apparatus for receiving signals in a transmission system transmitted based on a frame structure including signaling data and payload data. The receiving apparatus includes a receiver configured to receive a transmission signal, a frame demapper configured to demap signaling data blocks and payload data patterns from the frames of the frame structure of the received transmission signal, wherein a signaling data block is assumed to include a number of data corresponding to a number of a signaling data pattern, wherein the signaling data patterns are split into n signaling data portions, n being a positive integer, in which n signaling portions are mapped onto n or less frames, and a demodulation decoder is configured to separately demodulate and decode the signaling data blocks and payload data patterns to obtain signaling data and payload data.
    Type: Grant
    Filed: March 12, 2012
    Date of Patent: May 12, 2015
    Assignee: Sony Corporation
    Inventors: Jan Zoellner, Nabil Sven Loghin, Lothar Stadelmeier, Joerg Robert
  • Patent number: 9031145
    Abstract: Systems and methods for detecting data in a multiple input/multiple output signal. The method includes receiving a first signal associated with a first data value and a second signal associated with a second data value. A distance value between the received second signal and each possible second data value is calculated. Coordinates for a hypothetical first signal in light of a first possible second data value are calculated, and the first coordinate value is quantized to a nearest constellation point. A distance value between the received second signal and each possible second data value is calculated using the calculated constellation points. A determination is made of a log-likelihood ratio based on the determined distance values.
    Type: Grant
    Filed: May 30, 2014
    Date of Patent: May 12, 2015
    Assignee: Marvell International Ltd.
    Inventors: Arul Durai Murugan Palanivelu, Leilei Song, Rohit U. Nabar, Jungwon Lee, Sayandev Mukherjee, Hui-Ling Lou
  • Patent number: 9025696
    Abstract: A method for transmitting a sounding reference signal from a user equipment in a MIMO antenna wireless communication system. The method includes receiving sounding reference signal setup information from a base station, the sounding reference signal setup information including an initial cyclic shift value nSRScs and an initial transmissionComb parameter value kTC; setting an interval between cyclic shift values corresponding to each antenna port based on the initial cyclic shift value, to reach a maximum interval; setting a transmissionComb parameter value corresponding to a specific one of the antenna ports to a value different from the initial transmissionComb parameter value if the initial cyclic shift value is a previously set value and the number of antenna ports is 4; and transmitting the sounding reference signal to the base station through each antenna port by using the set cyclic shift value and transmissionComb parameter value.
    Type: Grant
    Filed: November 22, 2013
    Date of Patent: May 5, 2015
    Assignee: LG Electronics Inc.
    Inventors: Minseok Noh, Hyunsoo Ko, Jaehoon Chung, Moon-il Lee
  • Patent number: 9025690
    Abstract: The present invention relates to a receiver in a 2×2 Line of Sight Multiple Input Multiple Output, LoS MIMO, system. The receiver is arranged to estimate a first (?1) and a second (?2) signal on the basis of a first (r1(t)) and a second (r2(t)) signal received from respective first and second transmitters (Tx1,Tx2). Said received signals (r1(t), r2(t) comprises a first and second signal. The receiver comprises a first Phase Locked Loop (11), PLL, and a second PLL (12), which are arranged to respectively determine a first (In1) and second (In2) demodulated signal from the first (r1(t)) and the second (r2(t)) received signals. The receiver further comprises an equalizer (13) which is arranged to estimate the first (?1) and second (?2) signals from the demodulated signals (In1,In2).
    Type: Grant
    Filed: April 1, 2011
    Date of Patent: May 5, 2015
    Assignee: Telefonaktiebolaget L M Ericsson (publ)
    Inventors: Janos Ladvanszky, Gabor Kovacs, Anna Rhodin
  • Patent number: 9025704
    Abstract: Certain aspects of the present disclosure relate to techniques for generating likely demodulation candidates using Vector Candidate Sampling (VCS). VCS is used to generate high likelihood candidates for Multiple Input Multiple Output (MIMO) demodulation that approaches optimal maximum a posteriori (MAP) performance with reasonable complexity. A receive data vector is recorded corresponding to a signal received at a MIMO receiver. A plurality of likely candidates are determined for MIMO demodulation via VCS, based at least on the receive data vector. Determining the likely candidates may include perturbing the receive data vector for each candidate based on a pre-determined perturb vector, and estimating a corresponding transmit data vector based at least on the perturbed receive data vector for the candidate and an estimator matrix, wherein the likely candidate comprises the estimated data vector.
    Type: Grant
    Filed: March 1, 2013
    Date of Patent: May 5, 2015
    Assignee: QUALCOMM Incorporated
    Inventors: James E. Beckman, Alexei Yurievitch Gorokhov
  • Patent number: 9025708
    Abstract: In accordance with an embodiment, there is provided a method comprising receiving, at a receiver, a desired signal and an interfering signal, wherein the interfering signal was transmitted with a modulation unknown to the receiver; identifying a likely modulation corresponding to the modulation with which the interfering signal was transmitted; and decoding the desired signal using a modulation dependent multiple-input multiple output (MIMO) detection, wherein the modulation dependent MIMO detection is based at least in part on the identified likely modulation corresponding to the modulation with which the interfering signal was transmitted, wherein the modulation dependent MIMO detection includes maximum likelihood (ML) detection.
    Type: Grant
    Filed: July 15, 2014
    Date of Patent: May 5, 2015
    Assignee: Marvell International Ltd.
    Inventors: Yakun Sun, Krishna Srikanth Gomadam, Jiwoong Choi, Raphael Cendrillon, Hui-Ling Lou, Yan Zhang
  • Patent number: 9025707
    Abstract: Systems are provided for searching for a codeword from a plurality of codewords in a codebook for use in precoding, for example, as used in a multiple-input multiple-output (MIMO) transmission system. Dimension reduction techniques may be utilized to reduce the complexity and enhance the efficiency of the codebooks search. Null-spaces of an optimal codeword and codewords in a codebook may be computed. Distance values may be computed based on the null=spaces of the codewords. A codeword may be selected from the codebook based on a minimum distance value from the optimal codeword.
    Type: Grant
    Filed: October 11, 2013
    Date of Patent: May 5, 2015
    Assignee: Marvell International Ltd.
    Inventors: Yakun Sun, Jungwon Lee
  • Publication number: 20150117575
    Abstract: A receiver is configured to use a first part of a received signal and a second part of the received signal to determine, respectively, a first estimate and a second estimate of the channel. The first and second parts carry information for decoding the received signal in a first protocol and in a second protocol, respectively. A final estimate of the channel is performed from the first and the second estimates. The final estimate is then used for decoding the data in the received signal according to one of the protocols. A carrier frequency offset from a set of symbols occurring prior to preamble symbols is determined and is corrected for decoding the preamble symbols. The corrected preamble symbols are then used for estimating the channel. In one embodiment, the carrier frequency offset is determined for the multiple antenna packet format used in the 802.11n standard.
    Type: Application
    Filed: May 9, 2014
    Publication date: April 30, 2015
    Applicant: TEXAS INSTRUMENTS INCORPORATED
    Inventors: Raghu Ganesan, Sarma S. Gunturi
  • Patent number: 9020062
    Abstract: Systems and methods are provided for decoding signal vectors in multiple-input multiple-output (MIMO) systems, where the receiver has received one or more signal vectors based on the same transmitted vector. The receiver linearizes each received signal vector using one or more zero-forcing, MMSE, or other suitable linear equalizers. The components of the equalized signal vectors may be combined using maximum-ratio combining to form the components of a combined equalized signal vector. The components of the combined equalized signal vector may then be decoded individually using a linear decoder.
    Type: Grant
    Filed: April 24, 2014
    Date of Patent: April 28, 2015
    Assignee: Marvell World Trade Ltd.
    Inventors: Jungwon Lee, Woong Jun Jang, Hui-Ling Lou