Diversity (frequency Or Time) Patents (Class 375/347)
  • Patent number: 9020081
    Abstract: A diversity control method and a wireless communication apparatus which are capable of saving time and electricity consumed for diversity control if an approximation pattern approximating to a synchronization pattern appears in a reception signal during acquisition of the reception strength of every antenna by selecting any one of a plurality of antennas as a receiving antenna in every selection cycle, detection operation of a synchronization signal is continued regardless of the above described selection cycle.
    Type: Grant
    Filed: June 21, 2013
    Date of Patent: April 28, 2015
    Assignee: Lapis Semiconductor Co., Ltd.
    Inventor: Takeshi Ichikawa
  • Patent number: 9020051
    Abstract: A base station does not transmit any reference signal (RS) for channel measurement in a subframe in which transmission of an RS collides with transmission of a synchronization signal or a broadcast signal or in a resource block including the synchronization signal or the broadcast signal in the subframe. A user equipment assumes that any RS for channel measurement is not transmitted in a subframe or in a resource block when transmission of an RS collides with transmission of a synchronization signal or a broadcast signal in the subframe or in the resource block.
    Type: Grant
    Filed: March 25, 2011
    Date of Patent: April 28, 2015
    Assignee: LG Electronics Inc.
    Inventors: Moon Il Lee, Jae Hoon Chung, Hyun Soo Ko, Seung Hee Han
  • Patent number: 9020061
    Abstract: A method implemented in a base station used in a wireless communications system is disclosed. The method comprises having a codebook including a plurality of precoding matrices, precoding data with one of the plurality of precoding matrices, and transmitting, to a user equipment, the precoded data, wherein each precoding matrix W satisfies W=W(1)W(2), where first matrix W(1) is chosen from first codebook (1), and second matrix W(2) is chosen from a second codebook. Other apparatuses, systems, and methods also are disclosed.
    Type: Grant
    Filed: March 6, 2014
    Date of Patent: April 28, 2015
    Assignee: NEC Laboratories America, Inc.
    Inventors: Narayan Prasad, Guosen Yue, Mohammad Khojastepour, Sampath Rangarajan
  • Patent number: 9020145
    Abstract: A digital subscriber line access multiplexer (DSLAM) configured to couple to a first subscriber line and a second subscriber line, wherein the DSLAM comprises at least one transmitter configured to transmit a first signal onto the first subscriber line in a first time slot, transmit a second signal onto the second subscriber line in the first time slot, wherein the first and second signals are linearly related and are intended for a first customer premise equipment (CPE), transmit a third signal onto the second subscriber line in a second time slot, and transmit a fourth signal onto the first subscriber line in the second time slot, wherein the third and fourth signals are linearly related and are intended for a second CPE.
    Type: Grant
    Filed: December 18, 2012
    Date of Patent: April 28, 2015
    Assignee: Futurewei Technologies, Inc.
    Inventors: Haixiang Liang, Dong Wei
  • Patent number: 9019849
    Abstract: A system and method to perform Full Duplex (FD) Space Division Duplex (SDD) communication using a Self-Interference Cancelling (SIC) precoder that applies different antenna phase shifts and amplitude scales to the transmitted signals to force them to be in the null space of the selected receive antennas. Thus, a wireless communication unit can place nulls at each of its receive antennas digitally at baseband for one or more frequency bands. The SIC precoder may be computed based on the self-interference channel from the transmit chain(s) to the receive chain(s). Different SIC precoders may be adaptively selected and stored digitally for different frequency bands. Subsequent single or multi-user precoder can be applied in concatenation with the SIC precoder to transmit signals to one or more users while receiving signals from one or more users simultaneously over the same frequency band.
    Type: Grant
    Filed: November 7, 2011
    Date of Patent: April 28, 2015
    Assignee: Telefonaktiebolaget L M Ericsson (publ)
    Inventors: Dennis Hui, Jiann-Ching Guey
  • Publication number: 20150110229
    Abstract: An electronic device including a first transceiver configured to process a first carrier, a second transceiver configured to process a second carrier, a switch, a baseband processor configured to process a first baseband signal and a second baseband signal, which are processed respectively by the first transceiver and the second transceiver, an antenna connected through the switch in association with some of a plurality of reception paths with respect to the first carrier, and a reception path configured to provide the second transceiver with the first carrier received via the antenna connected through the switch to the second transceiver.
    Type: Application
    Filed: October 22, 2014
    Publication date: April 23, 2015
    Inventor: Young-Ju KIM
  • Publication number: 20150110230
    Abstract: Systems and methods are described using a Hermetic Transform, as well as related transforms, for applications such as directional reception and/or transmit of signals using phased-array devices and systems. The systems and methods an include identifying a direction of arrival for a mobile communicating device. The systems and methods also include the use of a noise conditioning matrix.
    Type: Application
    Filed: December 31, 2014
    Publication date: April 23, 2015
    Inventor: Harvey C. WOODSUM
  • Patent number: 9014287
    Abstract: A precoding scheme to accommodate user equipment (UEs) having higher Doppler speeds. In such transmission schemes, a different precoding matrix is applied to each orthogonal frequency division multiplex (OFDM) symbol in the transmission stream. Additionally, a downlink control message format is defined to handle assignment of multiple different transmission schemes using the same message format. The downlink control message format includes a control element in one of the message fields along with a set of parameters specifically applicable to the assigned transmission scheme. Based on the value of this control element, the UE sets the specific transmission scheme and determines a set of interpretation rules uniquely associated with that transmission scheme. Using the interpretation rules, the UE is able to read the set of parameters as applied to the selected transmission scheme.
    Type: Grant
    Filed: August 19, 2011
    Date of Patent: April 21, 2015
    Assignee: QUALCOMM Incorporated
    Inventors: Xiliang Luo, Peter Gaal, Hao Xu, Tao Luo, Kapil Bhattad, Juan Montojo, Wanshi Chen
  • Patent number: 9014311
    Abstract: Systems, methods, apparatuses, and computer program products for an interleaved multi-beam acquisition waveform providing concurrent beam selection, automatic gain control (AGC) and automatic frequency correction (AFC) are provided. The access point (AP) may send an acquisition waveform on multiple beams, then return and retransmit an AFC on the multiple beams thus interleaving beam switching with the acquisition and frequency correction waveforms. AGC correction can be deferred until the end, relying on the fact that the transmitter may be detected at close range using a one of the multi-beams that is attenuated.
    Type: Grant
    Filed: October 15, 2013
    Date of Patent: April 21, 2015
    Assignee: Nokia Solutions and Networks Oy
    Inventors: Mark Cudak, Timothy Thomas, Thomas Kovarik
  • Patent number: 9014317
    Abstract: A method for frequency performing offset estimation and channel estimation includes performing frequency offset estimation on the received data, and obtaining a frequency offset estimation result when interference signals in received data are not obtained, After the interference signals in the received data are obtained, the method includes performing frequency offset estimation on the received data according to the interference signals, and obtaining a frequency offset estimation result. Channel estimation is performed on the received data according to the frequency offset estimation result, and a channel estimation result is obtained. Interference signals are obtained according to the frequency offset estimation result and the channel estimation result, where the interference signals are used as parameters of the frequency offset estimation.
    Type: Grant
    Filed: March 25, 2014
    Date of Patent: April 21, 2015
    Assignee: Huawei Technologies Co., Ltd.
    Inventor: Meng Cai
  • Patent number: 9014316
    Abstract: A communications method uses simultaneously at least two receivers to reduce a need for data retransmissions. When using multiple receivers it is enough that at least one of the receivers outputs a correct bit set which are preferably checked by Cyclic Redundancy Check (CRC). The method comprises the following to be performed in a radio modem: a) receiving the same sample of a signal in a first receiver and in a second receiver; and in response to the same sample b) obtaining a first bit set from the first receiver and a second bit set from the second receiver; and c) determining whether the first bit set or the second bit set is a correct bit set. A retransmission request is sent only when the first and second bit sets are erroneous. This reduces latencies in the transmission. One can change receivers depending on the radio frequency (RF) circumstances.
    Type: Grant
    Filed: May 9, 2013
    Date of Patent: April 21, 2015
    Assignee: Broadcom Corporation
    Inventors: Arto Ilmari Houtari, Risto Juhani Paatelma
  • Patent number: 9008247
    Abstract: A communication circuit and a communication device are provided. The communication circuit includes first, second, and third RF transceivers, first and second baseband transceivers, and first and second modem circuits. The first and second RF transceivers are configured to down-convert first and second RF signals for MIMO. The third RF transceiver is configured to down-convert a third RF signal for a second telecommunication technology. The first baseband transceiver is configured to digitize the down-converted first RF signal to output a first baseband signal. The second baseband transceiver is configured to digitize one of the down-converted second or third RF signals according to a selection signal to output a second baseband signal. The first modem circuit is configured to digitally process the first and second baseband signals using the MIMO technology. The second modem circuit is configured to digitally process the second baseband signal using the second telecommunication technology.
    Type: Grant
    Filed: June 7, 2013
    Date of Patent: April 14, 2015
    Assignee: MediaTek Inc.
    Inventors: Wei-Cheng Tang, Juiyuan Tsai, Pao-Cheng Chiu
  • Patent number: 9008234
    Abstract: A method for transmitting and receiving a signal and an apparatus for transmitting and receiving a signal are disclosed. The method includes receiving the signal from a first frequency band in a signal frame including at least one frequency band, demodulating the received signal by an orthogonal frequency division multiplexing (OFDM) method and parsing the signal frame, acquiring a symbol stream of a service stream from the at least one frequency band included in the parsed signal frame, demapping symbols included in the symbol stream and outputting the demapped symbols to sub streams, multiplexing the output sub streams and outputting one bit stream, and deinterleaving and error-correction-decoding the output bit stream.
    Type: Grant
    Filed: September 29, 2008
    Date of Patent: April 14, 2015
    Assignee: LG Electronics Inc.
    Inventors: Woo Suk Ko, Sang Chul Moon
  • Patent number: 9008162
    Abstract: An exemplary system comprises at least one antenna, first and second signal paths, and an N-plexer. The antenna may be configured to receive first and second diversity receive signals. The antenna is further configured to transmit first and second diversity transmit signals. The first signal path may have a frequency converter configured to downconvert the first diversity receive signal to an intermediate frequency and to upconvert the first diversity transmit signal to a radio frequency. The second signal path may have a frequency converter configured to downconvert the second diversity receive signal to an intermediate frequency and to upconvert the second diversity transmit signal to the radio frequency. The N-plexer may be configured to provide the first and second diversity receive signals to a cable and to provide from the cable the first and second diversity transmit signals to the first signal path and the second signal path, respectively.
    Type: Grant
    Filed: October 17, 2012
    Date of Patent: April 14, 2015
    Assignee: Aviat U.S., Inc.
    Inventor: Paul A. Kennard
  • Patent number: 9008249
    Abstract: Techniques are provided which may be implemented using various methods and/or apparatuses in a device comprising a receiver to scan a spectral band of a received signal comprising a desired signal contribution to determine whether signal data associated with at least a sub-band of the spectral band further comprises at least one undesired signal contribution. In response to determining that the signal data comprises at least one undesired signal contribution, the mobile station may initiate at least one notch filter to affect the undesired signal contribution in subsequent signal data associated with the received signal.
    Type: Grant
    Filed: February 10, 2012
    Date of Patent: April 14, 2015
    Assignee: QUALCOMM Incorporated
    Inventors: Jie Wu, Emilija M. Simic, Timothy Paul Pals, Duong A. Hoang
  • Patent number: 9008237
    Abstract: A method for symbol detection includes assigning a received symbol to at least one particular candidate symbol of a set of candidate symbols of a finite candidate symbol alphabet based on a metric between the received symbol and the at least one particular candidate symbol, the metric comprising contributions with respect to channel-based information and contributions with respect to a priori information.
    Type: Grant
    Filed: June 27, 2013
    Date of Patent: April 14, 2015
    Assignee: Intel IP Corporation
    Inventors: Franz Eder, Tobias Kurpjuhn, Ernst Martin Witte
  • Patent number: 9008240
    Abstract: This invention is related to a low-complexity MIMO detector in a wireless communication system with near optimal performance. An initial symbol estimation is performed for a received symbol vector. The soft information of the received symbol vector can be more accurately calculated using every candidate symbol vector of a combined set of candidate symbol vectors, wherein the combined set is generated based on the initial estimation. By combining aspects of both the linear detection and the ML detection, the complexity of the proposed detector becomes orders of magnitude lower than that of a ML detector, but the performance is very close to that of an ML detector.
    Type: Grant
    Filed: December 31, 2013
    Date of Patent: April 14, 2015
    Assignee: Cambridge Silicon Radio Limited
    Inventors: Hong Wan, Fei Tong, Erik Lindskog
  • Patent number: 9008222
    Abstract: A station in a wireless communication system includes a processor circuitry configured to form at least a first plurality of data streams and a second plurality of data streams, and a digital precoder configured to receive the first plurality of data streams and the second plurality of data streams. The wireless station can further include a plurality of radio frequency (RF) beamforming chains connected to the digital precoder and configured to form at least one RF envelope, wherein the digital precoder is configured to steer a plurality of digital beams within the at least one RF beam envelope, the digital beams forming a plurality of spatially distinct paths for the first plurality of data streams and a plurality of spatially distinct paths for the second plurality of data streams, and a plurality of antennas operably connected to the RF beamforming chains.
    Type: Grant
    Filed: August 12, 2013
    Date of Patent: April 14, 2015
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Richard Stirling-Gallacher, Kaushik Morapakkam Josiam, Sridhar Rajagopal, Young-Han Nam
  • Patent number: 9008199
    Abstract: A MIMO transmitter including an interleaving system for parsing encoded bits to a plurality of spatial streams and a plurality of interleavers to interleave bits for spatial streams such that at least a first spatial stream uses a first stream interleaver that interleaves with a pattern distinct from a second stream interleaver interleaving for a second spatial stream.
    Type: Grant
    Filed: June 26, 2009
    Date of Patent: April 14, 2015
    Assignee: QUALCOMM Incorporated
    Inventor: D. J. Richard van Nee
  • Patent number: 9008205
    Abstract: A multi-input, multi-output pre-filter improves operation of a multi-input receiver by shortening the effective memory of the channel with a set of FIR filters. The coefficients of these FIR filters can be fashioned to provide a variety of controls by the designer, for example, the value of the effective memory.
    Type: Grant
    Filed: September 15, 2005
    Date of Patent: April 14, 2015
    Assignee: AT&T Intellectual Property II, L.P.
    Inventor: Naofal Al-Dhahir
  • Patent number: 9008209
    Abstract: The present invention relates to a method including signalling by a receive node at least one first transmission rank r to a transmit node, where 1?r ?R, wherein R is a maximum available rank for a transmission, and at least one predefined precoding matrix corresponds to the first transmission rank r, determining by the transmit node a second transmission rank r? for transmitting data from the transmit node to the receive node, where 1?r? ?R, defining at least two subsets of precoding matrices for at least one of the at least one first transmission rank r, selecting one of the at least two subsets of precoding matrices in accordance with a channel quality estimate for a radio channel, and signalling the selected one subset of precoding matrices, wherein the selected one subset of precoding matrices is associated with said the at least one predefined precoding matrix.
    Type: Grant
    Filed: September 30, 2013
    Date of Patent: April 14, 2015
    Assignee: Huawei Techonlogies Co., Ltd.
    Inventors: Jianghua Liu, Anahid Robert Safavi
  • Publication number: 20150098532
    Abstract: A method, an apparatus, and a computer program product for wireless communication are provided. The apparatus determines whether a timing offset between a PCC and an SCC possibly exceeds a threshold. In addition, the apparatus switches an amplifier gain utilizing one of a first set of gain states or a second set of gain states based on the determination that the timing offset possibly exceeds the threshold. The first set of gain states includes a first number of gain states, and the second set of gain states includes a second number of gain states less than the first number of gain states.
    Type: Application
    Filed: September 26, 2014
    Publication date: April 9, 2015
    Inventors: Jae Ho RYU, Tingfang JI, Valentin Alexandru GHEORGHIU
  • Patent number: 9001946
    Abstract: Provided are a method of receiving downlink data and a machine type communication (MTC) device using the same. The MTC device according to the present invention which has a plurality of antennas includes a reception signal processing module that receives a downlink reference signal for each antenna from a base station, estimates reception signal quality with respect to the downlink reference signal for each antenna, and selects the antenna to receive a downlink signal in accordance with the reception signal quality with respect to each antenna.
    Type: Grant
    Filed: May 29, 2013
    Date of Patent: April 7, 2015
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Jun Hwan Lee, Hee Sang Chung, Il Gyu Kim, Seung Chan Bang
  • Patent number: 9001909
    Abstract: A receiving station receives an orthogonal frequency division multiplexing (OFDM) symbol via a shared medium, the OFDM symbol comprising a first set of frequency components modulated with preamble information and a second set of frequency components modulated with information. The receiving station processes sampled values of the received OFDM symbol based on channel characteristics estimated from the first set of frequency components to decode information encoded on a first subset of the second set of frequency components. The receiving station processes sampled values from the first symbol based on channel characteristics estimated from the first set of frequency components and the first subset of the second set of frequency components to decode information encoded on a second subset of the second set of frequency components.
    Type: Grant
    Filed: September 26, 2013
    Date of Patent: April 7, 2015
    Assignee: QUALCOMM Incorporated
    Inventors: Lawrence Winston Yonge, III, Hassan Kaywan Afkhami, Arun Avudainayagam
  • Patent number: 9001945
    Abstract: In one embodiment, a method for performing antenna diversity combining for digitally broadcast radio signals includes generating a first signal quality metric for a first signal obtained from an incoming digitally broadcast radio signal received in a first signal path, and similarly generating a second signal quality metric for a second signal obtained from the radio signal received in a second signal path. Then the first and second signals from these paths can be coherently combined based on the signal quality metrics to obtain a combined frequency domain symbol. In some embodiments, this combined frequency domain symbol may be remodulated to a time domain symbol. Also in some embodiments N tuners can be daisy chained to generate a final output that is either a frequency domain symbol of combined sub-carriers, soft bits to a forward error correction (FEC) decoder, or a remodulated time domain symbol. As a further possibility, each of the N tuners can use a different local oscillator (LO) frequency.
    Type: Grant
    Filed: June 16, 2011
    Date of Patent: April 7, 2015
    Assignee: Silicon Laboratories Inc.
    Inventors: Javier Elenes, Lokesh Duraiappah
  • Publication number: 20150092897
    Abstract: A method and apparatus for achieving China Mobile Multimedia Broadcasting (CMMB) diversity reception are disclosed. The method includes: acquiring respective Analogue-to-Digital Converter (ADC) data of two antennas; respectively conducting a synchronization and Fast Fourier Transform (FFT) operation on the ADC data of the two antennas, acquiring delay information about the two antennas, and according to an operation result, selecting a signal to noise ratio (SNR) configuration parameter; according to the delay information, conducting delay compensation on the operated data; and according to the selected SNR configuration parameter, merging the data of the two antennas on which the delay compensation is conducted, and outputting the data.
    Type: Application
    Filed: July 13, 2012
    Publication date: April 2, 2015
    Inventors: Zhi Huang, Li Chen, Shangyuan Wang
  • Patent number: 8995551
    Abstract: An apparatus and method for generating a codebook in a wireless communication system are disclosed. The codebook generation apparatus includes a processor for generating a covariance matrix of a channel between the transmitting end and a receiving end, using a unitary matrix including a first vector corresponding to at least one quantized dominant singular singular vector of the channel and a second vector corresponding to at least one basis vector of a null space of the first vector, and transforming a predefined first codebook by applying the covariance matrix of the channel to the first codebook.
    Type: Grant
    Filed: March 22, 2011
    Date of Patent: March 31, 2015
    Assignee: LG Electronics Inc.
    Inventors: Hyung Tae Kim, Han Byul Seo, Byoung Hoon Kim, Ki Jun Kim
  • Patent number: 8995557
    Abstract: The present disclosure provides a method of generating codebook in a wireless communication system with multiple antenna arrays, as well as a wireless communication system, base station and terminal using the codebook for communication. The method comprises steps of: providing a basic codebook which contains multiple pre-coding matrices; and assigning phase offsets to certain pre-coding matrices in the basic codebook to form a codebook with phase offset. The feedback overhead from a client to a base station side is reduced and a good precision of feedback for multi-antenna array is kept by applying the method of generating codebook and using the generated codebook in the wireless communication system, base station and terminal.
    Type: Grant
    Filed: June 26, 2014
    Date of Patent: March 31, 2015
    Assignee: Panasonic Intellectual Property Corporation of America
    Inventors: Hui Tong, Masayuki Hoshino, Ming Xu, Seigo Nakao, Daichi Imamura
  • Patent number: 8995587
    Abstract: A method for processing a preamble of a data unit transmitted via a communication channel includes receiving a signal via a plurality of antennas, applying a plurality of distinct steering vectors to the received signal to generate a plurality of respective outputs, and using the plurality of outputs to perform at least one of carrier sensing and symbol timing synchronization associated with the preamble.
    Type: Grant
    Filed: May 13, 2013
    Date of Patent: March 31, 2015
    Assignee: Marvell International Ltd.
    Inventors: Hongyuan Zhang, Sudhir Srinivasa, Rohit U. Nabar
  • Patent number: 8995549
    Abstract: A method and apparatus are provided for transmitting a source signal including a plurality of binary sequences to NR receiving antennas, where NR is no lower than 2. The method implements, for at least one first binary sequence of the source signal, pre-filtering for focusing a signal to be transmitted on at least one of the reception antennas, referred to as the target antenna. The target antenna and the associated focus pre-filtering step are selected according to a value of the first binary sequence intended for being considered as received. The method also includes transmitting the pre-filtered signal.
    Type: Grant
    Filed: December 14, 2010
    Date of Patent: March 31, 2015
    Assignee: Orange
    Inventors: Rodolphe Legouable, Dinh Thuy Phan Huy, Isabelle Siaud
  • Patent number: 8995554
    Abstract: A method and apparatus of reducing interference in space frequency block coding (SFBC) communication are disclosed. SFBC encoding is performed on at least one pair of symbols. The symbols are assigned to subcarriers in accordance with a frequency assignment pattern assigned to a cell. Different frequency assignment patterns are assigned to neighboring cells. Cells in the network may be divided into a plurality of groups and a different frequency assignment pattern may be assigned to each group of cells. The frequency assignment pattern may be defined such that subcarriers mapped to a pair of symbols in one cell are interlaced to subcarriers mapped to a pair of symbols in a neighbor cell. Alternatively, the frequency assignment pattern may be defined such that subcarriers mapped to a pair of symbols in one cell are shifted in a neighbor cell.
    Type: Grant
    Filed: January 31, 2014
    Date of Patent: March 31, 2015
    Assignee: InterDigital Technology Corporation
    Inventors: Afshin Haghighat, Yingxue Li
  • Patent number: 8995590
    Abstract: An apparatus including a configurable demodulation architecture which includes a control module and a demodulation engine. The control module includes a set of one or more control fields. The demodulation engine includes a spatial whitening module, a Minimum Mean Square Estimation (MMSE) module, at least a first Maximal Ratio Combining (MRC) module, and at least one multiplexer. Further, the multiplexer is coupled to the instruction module and controlled based on the control fields to select at least one of the MMSE module or MRC module.
    Type: Grant
    Filed: March 20, 2009
    Date of Patent: March 31, 2015
    Assignee: Qualcomm Incorporated
    Inventors: Raghu N. Challa, Hemanth Sampath, Gwendolyn D. Barriac
  • Patent number: 8995591
    Abstract: A wireless communication device configured for receiving multiple signals is described. The wireless communication device includes a single-chip carrier aggregation receiver architecture. The single-chip carrier aggregation receiver architecture includes a first antenna, a second antenna, a third antenna, a fourth antenna and a transceiver chip. The transceiver chip includes multiple carrier aggregation receivers. The single-chip carrier aggregation receiver architecture reuses at least one of the carrier aggregation receivers for secondary diversity.
    Type: Grant
    Filed: March 14, 2013
    Date of Patent: March 31, 2015
    Assignee: QUALCOMM, Incorporated
    Inventors: Prasad Srinivasa Siva Gudem, Liang Zhao, Jin-Su Ko, Hong Sun Kim
  • Patent number: 8989302
    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: March 24, 2015
    Assignee: LG Electronics Inc.
    Inventors: Minseok Noh, Hyunsoo Ko, Jaehoon Chung, Moon-il Lee
  • Patent number: 8989077
    Abstract: A base station including a communication unit for communicating with a mobile terminal via a relay link between the base station and a relay device and an access link between the relay device and the mobile terminal, and a selection unit for selecting an allocation pattern of an uplink of the relay link, a downlink of the relay link, an uplink of the access link, and a downlink of the access link to frequency-time blocks from a plurality of allocation patterns that are different in delay occurring between the base station and the mobile terminal.
    Type: Grant
    Filed: June 10, 2010
    Date of Patent: March 24, 2015
    Assignee: Sony Corporation
    Inventor: Hiroaki Takano
  • Patent number: 8989314
    Abstract: A computer-readable medium stores instructions causing one or more processors to demodulate a received signal including a plurality of user signals. Respective user data in each of at least some of the plurality of user signals is encoded with a respective finite state machine encoder having a respective number of states Si, wherein i=1, 2, . . . , N, N being the number of users, and wherein at least a first user signal and a second user signal are encoded independently of each other. The instructions cause the processor(s) to calculate distances between transmit symbols in the received signal and an expected joint symbol value, and jointly decode, with a finite state machine decoder, user data in the demodulated received signal, including at least first user data corresponding to the first user signal, based on the calculated distances. The finite state machine decoder has S1*S2* . . . *SN states.
    Type: Grant
    Filed: March 17, 2014
    Date of Patent: March 24, 2015
    Assignee: Marvell International Ltd.
    Inventors: Jungwon Lee, Jihwan P. Choi
  • Patent number: 8989294
    Abstract: A multiple-input multiple-output (MIMO) system can transmit on multiple antennas simultaneously and receive on multiple antennas simultaneously. Unfortunately, because a legacy 802.11a/g device is not able to decode multiple data streams, such a legacy device may “stomp” on a MIMO packet by transmitting before the transmission of the MIMO packet is complete. Therefore, MIMO systems and methods are provided herein to allow legacy devices to decode the length of a MIMO packet and to restrain from transmitting during that period. These MIMO systems and methods are optimized for efficient transmission of MIMO packets.
    Type: Grant
    Filed: February 27, 2013
    Date of Patent: March 24, 2015
    Assignee: QUALCOMM Incorporated
    Inventors: Qinfang Sun, Won-Joon Choi, Jeffrey M. Gilbert, Ardavan Maleki Tehrani
  • Patent number: 8989817
    Abstract: Method and apparatus related to implementing and/or utilizing different polarization antennas with different corresponding average transmit power levels are described. Inter-cell interference is mitigated by having different cells with different power relationships between polarizations antennas. For example, a first base station transmits at a high average power level on its vertical polarization antenna and transmits at a low average power level on its horizontal polarization antenna. Concurrently, a second base station, which is adjacent to the first base station, transmits at a low average power level on its vertical polarization antenna and transmits at a high average power level on its horizontal polarization antenna. In some hexagonal deployment schemes a base station has at most two adjacent base stations using the same power level to antenna polarization direction relationship as it is using.
    Type: Grant
    Filed: March 6, 2008
    Date of Patent: March 24, 2015
    Assignee: QUALCOMM Incorporated
    Inventors: Xinzhou Wu, Vikram Reddy Anreddy, Junyi Li, Rajiv Laroia
  • Patent number: 8989309
    Abstract: The method includes providing a stream of data to be transmitted, and processing the data by means of channel coding with a time-varying code rate, thereby generating a stream of channel coded data. The method further includes forming succeeding transmission time intervals and distributing the channel coded data on the transmission time intervals, and adjusting a transmission power of the signal to be transmitted by timely positioning a transmission power slope between two succeeding transmission time intervals so that the transmission power slope is contained completely within one transmission time interval of the two transmission time intervals, wherein the one transmission time interval comprises a lower nominal code rate or a lower nominal transmission power than the other one of the two transmission time intervals.
    Type: Grant
    Filed: March 18, 2014
    Date of Patent: March 24, 2015
    Assignee: Intel Mobile Communications GmbH
    Inventor: Tobias Scholand
  • Publication number: 20150078497
    Abstract: Certain aspects of the present disclosure provide methods and apparatus for generating local oscillator (LO) signals for multiple receive chains. One example circuit for generating first and second signals generally includes a first voltage controlled oscillator (VCO) configured to output the first signal at a first frequency and associated with a first receive chain for receiving a first carrier of an aggregated resource; and a second VCO configured to output the second signal at a second frequency and associated with a second receive chain for receiving a second carrier of the aggregated resource. The second frequency is different than the first frequency. In this manner, pulling or coupling between the two VCOs may be avoided, even if the two VCOs are implemented on the same radio frequency integrated circuit (RFIC).
    Type: Application
    Filed: April 30, 2014
    Publication date: March 19, 2015
    Applicant: QUALCOMM Incorporated
    Inventors: Gang ZHANG, Frederic BOSSU
  • Patent number: 8982978
    Abstract: The present invention relates to a method for transmitting a signal from a transmitter to a receiver through N number of transmitting antennas (where N?2), comprising: selecting a first and a second matrix from a first and a second codebook related to a first and a second precoding matrix indicator (PMI), respectively, and determining a precoding matrix on the basis of the first and second matrix; performing precoding by using the determined precoding matrix for L number of layers (where 1?L?N) to which a signal to be transmitted to the receiver is mapped; and transmitting the precoded signal to the receiver through the N number of transmitting antennas. Here, the first codebook includes one or more diagonal matrices having an N×N size, non-zero elements in the diagonal matrix has a predetermined phase value, and the second codebook includes one or more matrices having an N×L size.
    Type: Grant
    Filed: August 23, 2011
    Date of Patent: March 17, 2015
    Assignee: LG Electronics Inc.
    Inventors: Hyunsoo Ko, Jaehoon Chung, Moonil Lee
  • Patent number: 8982981
    Abstract: A method of data transmission includes determining the number of layers, generating mapping symbols by mapping modulation symbols for a first codeword and modulation symbols for a second codeword to each layer, and transmitting the mapping symbols through a plurality of antennas. At least one of the first codeword and the second codeword is mapped to at least 3 layers and the number of layers is larger than 3.
    Type: Grant
    Filed: November 11, 2013
    Date of Patent: March 17, 2015
    Assignee: LG Electronics Inc.
    Inventors: Jae Hoon Chung, Hyun Soo Ko, Seung Hee Han, Moon Il Lee
  • Patent number: 8982936
    Abstract: A system employing vector signal generator (VSG) and vector signal analyzer (VSA) modules or cards that are configured to test multiple devices under test simultaneously. Each VSG is configured to generate multiple RF test signals and send them to multiple devices under test simultaneously. Similarly, each VSA is configured with multiple signal receiving modules connected to a single controller or memory. Each signal receiving module receives an RF signal from a device under test, converts it to a baseband digital signal, and transmits this digital signal to the VSA's memory. A single RF testing system can employ multiple such VSGs and VSAs, each capable of evaluating multiple devices under test. Each VSG/VSA can further be tuned for operation in discrete or defined frequency bands, which are narrower than those for conventional RF testers, and which can correspond to various wireless standards.
    Type: Grant
    Filed: April 10, 2012
    Date of Patent: March 17, 2015
    Assignee: Insight Scientific International (Shanghai) Ltd.
    Inventors: Michael Shih Chiang Yang, Lin Guo
  • Patent number: 8983002
    Abstract: Systems and methods for establishing transmission format parameters between communication devices are provided. In some aspects, a method includes identifying, by a first base station, a first communication session with a first user equipment. A master set of transmission format parameters is shared between the first base station and the first user equipment. The method also includes assigning a first subset of the master set of transmission format parameters to the first communication session. The first subset is specifically assigned to the first communication session and specifies which of the master set of transmission format parameters is allocated for use in the first communication session. The method also includes transmitting an indicator of the first subset to the first user equipment.
    Type: Grant
    Filed: March 14, 2013
    Date of Patent: March 17, 2015
    Assignee: Broadcom Corporation
    Inventors: Krishna Srikanth Gomadam, Djordje Tujkovic
  • Patent number: 8983011
    Abstract: In one aspect, a method for mitigating an effect of an interfering radio signal at a multiple antenna receiver includes forming an estimate of a relationship of the interfering signal among signals received from the multiple antennas. In general, the interfering signal does not share the same communication technology as a desired signal. The signals received from the multiple antennas filtered and combined according to the estimate of the relationship of the interfering channels to reduce an effect of the interfering signal. Desired data present in the desired signal represented in the filtered and combined signals is decoded and the estimate of the relationship of the interfering signals is updated according to the decoding of the desired signal.
    Type: Grant
    Filed: July 31, 2012
    Date of Patent: March 17, 2015
    Assignees: Massachusetts Institute of Technology, Carnegie Mellon University
    Inventors: Shyamnath Gollakota, Fadel Adib, Dina Katabi, Srinivasan Seshan
  • Patent number: 8976643
    Abstract: A wireless communication method for a transmission apparatus that transmits an OFDM (orthogonal frequency division multiplexing) signal using a communication band, which comprises a plurality of subcarrier groups each including a plurality of subcarriers. The method includes specifying which subcarrier group and how many subcarriers are to be used to transmit the OFDM signal, determining a configuration of a transmission frame, generating the OFDM signal by mapping data symbols according to the determined configuration of the transmission frame, and transmitting the generated OFDM signal.
    Type: Grant
    Filed: February 28, 2013
    Date of Patent: March 10, 2015
    Assignee: Panasonic Intellectual Property Corporation of America
    Inventors: Yutaka Murakami, Shinichiro Takabayashi, Masayuki Orihashi, Akihiko Matsuoka
  • Patent number: 8976845
    Abstract: A network element for a wireless communication system is locatable to couple at least one base station to an antenna array comprising a plurality of antenna elements. The network element comprises a plurality of independent transceiver circuits coupled to at least one of a plurality of respective antenna elements of the antenna array; and logic arranged to apply at least one complex digital signal to at least one transceiver signal path of a transceiver circuit of the plurality of independent transceiver circuits. A feedback path is arranged to provide feedback of the at least one complex digital signal such that it is capable of facilitating determination of latency mismatch error response between at least two transceiver signal paths. Adjustment means comprises delay logic arranged to receive a complex digital signal and provide a modified representation of the received complex digital signal in response to the latency mismatch error response of the at least two transceiver signal path.
    Type: Grant
    Filed: February 10, 2010
    Date of Patent: March 10, 2015
    Assignee: Socowave Technologies, Ltd.
    Inventors: Conor O'Keeffe, Michael William O'Brien
  • Patent number: 8976836
    Abstract: A sounding reference signal transmission method which is efficient in an uplink wireless telecommunications system using a multiple antenna technique and sounding reference signal hopping. A terminal using the multiple antenna technique is equipped with a plurality of antennas, and a base station receives the sounding reference signal transmitted from these antennas and estimates the uplink channel state of each antenna. Moreover, the sounding reference signal performs frequency hopping so that the base station determines the channel condition for the entire bandwidth to which data is transmitted in the uplink system. The sounding reference signal is transmitted through an antenna pattern in which the sounding reference signal can be transmitted through the entire data transmission bandwidth of the uplink system for each antenna of the terminal without additional overhead in this environment.
    Type: Grant
    Filed: December 19, 2012
    Date of Patent: March 10, 2015
    Assignee: Samsung Electronics Co., Ltd
    Inventors: Sang Min Ro, Joon Young Cho, Ju Ho Lee, Yingyang Li, Jin Kyu Han
  • Patent number: 8976888
    Abstract: The present invention discloses a method for uplink multi-user cooperation communication, including a first, and a second source node and a target node. When transmitting a signal to the target node, the first source node also transmits the signal to the second source node, the second source node changing to a relay node of the first source node and forwarding the signal to the target node; the target node obtains its reception Signal Noise Ratio (SNR) by using a maximal ratio combining mode according to the signal directly transmitted from the first source node and the signal forwarded from the second source node, sets a precoding policy according to the reception SNR, and selects the optimal precoding as a precoding vector which is used when the first source node transmits a signal to the target node.
    Type: Grant
    Filed: June 30, 2011
    Date of Patent: March 10, 2015
    Inventors: Kan Zheng, Hang Long, Fangxiang Wang
  • Patent number: 8976850
    Abstract: Provided is a channel state information (CSI) sharing method and apparatus in a Multiple User Multiple Input Multiple Output (MU-MIMO) environment. Each node may use network-coding to reduce overhead necessary for sharing CSI between all nodes in the MU-MIMO environment. A transmitter may dynamically select, based on the CSI between receivers, a path used for transmitting data to each receiver and a receiver to be used as a relay based on the global CSI. A decoding performance may be improved based on the CSI between the transmitter and the receivers.
    Type: Grant
    Filed: December 30, 2010
    Date of Patent: March 10, 2015
    Assignees: Samsung Electronics Co., Ltd., Purdue Research Foundation
    Inventors: Bruno Clerckx, Jun Il Choi, Taejoon Kim, Obadamilola Aluko, David J. Love