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Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Inventor:
Jin; Hang
Address:
Plano, TX
No. of patents:
82
Patents:


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Patent Number Title Of Patent Date Issued
8280426 Adaptive power balancing and phase adjustment for MIMO-beamformed communication systems October 2, 2012
Techniques are provided for improving performance of a multiple-input multiple-output (MIMO) wireless communication system. At a first wireless communication device (e.g., a base station) having a plurality of antennas, uplink transmissions are received from a second wireless communi
8260361 Method and system for transmitter beamforming September 4, 2012
A system and method are provided for improving the performance of a beamforming antenna array in a wireless communications system. By observing a predetermined times of channel spatial signatures, one or more test spatial signatures are generated based on statistical analysis of the
8254845 Combined beamforming and nulling to combat co-channel interference August 28, 2012
Techniques are provided to improve receive beamforming at a wireless communication device that receives energy in a frequency band at M plurality of antennas, where the received energy includes desired signals and interference signals. The wireless communication device has no knowled
8249538 Offset direct conversion receiver August 21, 2012
An offset direct conversion receiver apparatus and corresponding receiving method are provided. A received wireless signal is directly downconverted and demodulated to a baseband offset frequency that is offset from zero frequency to produce an in-phase (I) baseband offset signal cen
8249509 Dynamic channel estimation based on channel conditions August 21, 2012
A dynamically adaptive channel estimation process is provided for use in a wireless communication device. At a first device, a wireless transmission is received from a second device. The transmission comprises a plurality of successive symbols each of which comprises a plurality of s
8238487 Log-likelihood ratio algorithm for use in reducing co-channel interference in wireless communica August 7, 2012
In one embodiment, an apparatus includes a receiver configured to receive a transmission from a wireless communication device, the transmission associated with resource units, a detector configured to generate log-likelihood ratio data from the received transmission, and a controller
8223735 Multi-carrier code division multiple access beamforming July 17, 2012
Techniques are provided to performing beamforming on a wireless communication link that employs multi-carrier code division multiple access (MC-CDMA) signal formatting techniques. At a first wireless communication device, a waveform is received at each of a plurality of antennas, whe
8218677 Transmitter characterization for digital pre-distortion using offset preamble subcarriers July 10, 2012
Techniques are provided to pre-distort a signal that is transmitted by a transmitter of a wireless communication device, e.g., a device configured for wireless radio frequency communication. The transmitter of the device inherently introduces distortion to the baseband signal to be t
8213527 Channel variation detection of wireless channel for adaptive transmission schemes July 3, 2012
A first wireless communication device recovers data from a transmission received over a wireless channel from a second wireless communication device and processes the received data with each of multiple channel variation compensations to produce corresponding processed received data
8195240 Hybrid time-spatial multiplexing for wireless broadcast messages through antenna radiation beam June 5, 2012
A hybrid time-spatial multiplexing technique is provided for beamforming broadcast messages to mobile stations that may be within a coverage region or cell of a base station. The coverage region is divided into a plurality of segments. The mobile stations are assigned to at least one
8190980 Trellis-based decoder using states of reduced uncertainty May 29, 2012
A method and system are provided for improving the performance of a trellis-based decoder. States with reduced uncertainty (SRUs) are defined for one or more predetermined fields in an encoded message. Metrics are set for the SRUs such that candidate paths through a trellis-based dec
8181076 Method for retransmitting a data sequence according to channel condition in a wireless communica May 15, 2012
Retransmitting a data sequence over a wireless network according to channel conditions proceeds by transmitting a first transmitting signal representing the data using a first set of beamforming weighting vectors generated according to a first channel condition. A request for re-tran
8149942 Method and system for selecting a transmission scheme in a multiple-input-multiple-output wirele April 3, 2012
The present invention discloses a method for selecting a transmission scheme in a multiple-input-multiple-output (MIMO) wireless communications system. The method comprises receiving a downlink request to transmit a data stream to a wireless station, checking the availability of channel
8145272 Pilot-based two-dimensional channel estimation March 27, 2012
Techniques are provided herein to estimate channel information based a received burst that is comprises of consecutive transmissions. Each transmission comprises a plurality of data subcarriers and a plurality of pilot subcarriers on a radio frequency (RF) channel, wherein locations of
8134503 Open-loop beamforming MIMO communications in frequency division duplex systems March 13, 2012
Techniques are provided for wireless communication between a first wireless communication device and a second wireless communication device. At a plurality of antennas of the first wireless communication device, one or more signals transmitted by a second wireless communication device
8130875 Method for estimating channel response in a wireless communications network based on pilot signa March 6, 2012
The present invention discloses a method for estimating a channel response of data subcarriers in a wireless communications network. The method comprises estimating a first plurality of channel responses of pilot subcarriers carrying pilot signals at the time instance using pilot sig
8121211 Adaptive switching techniques for hybrid automatic repeat request systems February 21, 2012
An adaptive transmission selection technique is provided. A retransmission scheme is selected for a multiple-input-multiple-output wireless system. A plurality of communication techniques is provided for when a first device needs to retransmit a signal to a second device. The first d
8116818 Method and system for transmitter beamforming February 14, 2012
A system and method are provided for improving the performance of a beamforming antenna array in a wireless communications system. A predetermined number of spatial signatures are observed for a communications channel between a base station and a mobile terminal during a predetermine
8116698 Generalized MIMO-beamforming weight estimation February 14, 2012
Techniques are provided to enable wireless communication between first and second wireless communication devices each having a plurality of antennas, where the second device sends the transmissions via less than all of its plurality of antennas. Each transmission may comprise a plura
8098212 Method for antenna array partitioning January 17, 2012
A method for partitioning a plurality of antennas in a wireless communication system, in which the antennas are grouped into a first set of partitions and a second set of partitions. One or more signal transmission schemes are performed with the antennas grouped into the first set of
8090042 Channel randomization and time diversity for MIMO system January 3, 2012
A method is provided for creating an artificial a fast fading channel in a MIMO communication system. The method includes encoding a series of source data to generate a first plurality of encoded output signals and multiplying the first plurality of encoded output signals by a plurality
8077809 Link adaptation based on generic CINR measurement according to log-likelihood ratio distribution December 13, 2011
Techniques are provided to compute the carrier to interference-plus-noise ratio (CINR) in a wireless communication system using log-likelihood ratio (LLR) data generated from a received transmission. The LLR data are collected as they are sent from a detector to a forward error correctio
8073489 Method for dynamic uplink sounding region allocation December 6, 2011
The present invention discloses a method for allocating an uplink sounding region dynamically to obtain downlink channel quality information (CQI) about a downlink channel. The method comprises receiving a downlink transmission request and retrieving an identification information fro
8068552 Method and system for achieving spatial diversity of a wireless communications network November 29, 2011
A method and system are provided for achieving spatial diversity of a wireless communications network. The method comprises arranging antennas on a transmitting wireless station into a plurality of antenna subgroups, wherein each of the antenna subgroups forms a virtual antenna, creating
8068445 Scheduling uplink sounding signals November 29, 2011
A method and apparatus are provided for scheduling a transmission of uplink sounding signals for a mobile station (MS). The method comprises receiving a request to send the MS downlink signals associated with a service flow at a first frame, searching a scheduling database for pendin
8059744 Frequency band extrapolation beamforming weight computation for wireless communications November 15, 2011
Techniques are provided to facilitate the computation of beamforming weights used by a first communication device when sending a transmission via a plurality of antennas to a second communication device where knowledge of the behavior of the channel between the first communication de
8050622 Method and system for detecting messages using enhanced distributed signaling November 1, 2011
A method and system are provided for detecting messages using enhanced distributed signaling in a wireless communication network that offers transmission diversity to improve the throughput of participating wireless stations.
8040831 Method and system for control channel beamforming October 18, 2011
A system and method for managing control information in a wireless communications system. The method comprises broadcasting a predetermined number of preambles through beamforming from a base station, detecting, by a subscriber station, a predetermined frame associated with one selec
8032184 Method for generating downlink beamforming weighting vectors October 4, 2011
Techniques are provided for generating downlink beamforming weighting vectors by using channel information about one or more uplink sub-channels in a wireless communications network in the case of frequency mismatch between downlink channels and uplink channels for a specific user. T
8031786 Method and system for improving channel estimation in a communications network October 4, 2011
The present invention discloses a method for improving channel estimation in a communications network. The method comprises estimating first channel characteristics of first sub-carriers carrying pilot signals; obtaining second channel characteristics of second sub-carriers carrying
8005060 Beamforming techniques to improve ranging signal detection August 23, 2011
Ranging code detection techniques are provided. Energy is received at a plurality of antennas of a first wireless communication device and received signals are generated from the received energy. The received energy comprises a ranging transmission from one or more second wireless co
8000418 Method and system for improving robustness of interference nulling for antenna arrays August 16, 2011
A method and system are provided for improving the robustness of interference nulling for antenna arrays in a wireless communication network. The method is comprised of generating a first interference spatial signature from an interference signal matrix received by the antenna array,
7991083 Method and system for detecting preambles in a multi-cell system August 2, 2011
A method and system is provided for detecting preambles in a multi-cell communication system. The method detects preambles reliably even in the presence of interference caused by multiple cells reusing the same frequency in the multi-cell communication system. After receiving a signa
7966043 Method for creating multiple-input-multiple-output channel with beamforming using signals transm June 21, 2011
A method is provided for generating a beamformed multiple-input-multiple-output (MIMO) channel. The method comprises receiving by a first wireless station a first plurality of signals transmitted from a first antenna on a second wireless station, deriving by the first wireless statio
7965783 Method and system for transmitting data streams via a beamformed MIMO channel June 21, 2011
A method and apparatus are provided for transmitting data streams in a wireless multiple-input-multiple-output (MIMO) communications system. The method comprises receiving a plurality of signals by a first mobile station, the plurality of signals being transmitted from antennas on a
7925268 Method for optimizing up-link transmission power for a wireless terminal in a multi-carrier syst April 12, 2011
Techniques are provided herein to optimize up-link transmission power from a wireless terminal to a base transceiver station in a multicarrier system. A pathloss between the wireless terminal and the base transceiver station is determined. A determination is made if the pathloss is less
7924957 Method for creating beamformed multiple-input-multiple-output channels with partial nulling April 12, 2011
The present invention discloses a method for generating beamformed multiple-input-multiple-output (MIMO) channels. The method comprises receiving by a base station (BS) a first plurality of receiving signals transmitted from a first antenna on a mobile station (MS), receiving by the
7889131 Beamformed space time code communication with testing spatial signature generation February 15, 2011
An apparatus, logic and method are provided to improve beamformed space time code (STC) wireless communication. A first device comprising a plurality of antennas receives signals at the plurality of antennas transmitted from a first antenna of a second device. A testing spatial signa
7884763 Orthogonal/partial orthogonal beamforming weight generation for MIMO wireless communication February 8, 2011
Techniques are provided for computing beamforming weight vectors useful for multiple-input multiple-output (MIMO) wireless transmission of multiple signals streams from a first device to a second device. The techniques involve computing a plurality of candidate beamforming weight vec
7876863 Method and system for improving timing position estimation in wireless communications networks January 25, 2011
A method for determining timing positions in a wireless communications system comprises creating a time-domain timing detection window from a preamble of a receiving signal, generating a first vector of correlations between sampling points in the time-domain timing detection window and
7876715 Beamforming multiple-input multiple-output wireless techniques using spatial decomposition for f January 25, 2011
Techniques are provided herein to combine the advantages of beamforming with the advantages of multiple-input multiple output (MIMO) technology in a frequency division duplex (FDD) communication system, even when the uplink and downlink frequency separation exceeds the coherent bandwidth
7861137 System for identifying localized burst errors December 28, 2010
A system for detecting one or more localized burst errors in a receiving message comprised of a plurality of codewords. The system comprises a trellis code decoder for decoding a receiving message with a plurality of codewords and calculating one or more cumulative metrics of a maximum
7839817 Apparatus for detecting uplink ranging codes in a wireless communication system November 23, 2010
An apparatus for detecting uplink ranging codes includes a first transform unit for transforming data received from a mobile station to generate first outputs; a cross-correlation unit for comparing the first outputs with possible ranging codes to generate second outputs; a screening uni
7825856 Low complexity blind beamforming weight estimation November 2, 2010
Techniques are provided to compute beamforming weights at a communication device, e.g., a first communication device, based on transmissions received at a plurality of antennas from another communication device, e.g., a second communication device. A plurality of transmissions are re
7822442 Method and system for partitioning an antenna array and applying multiple-input-multiple-output October 26, 2010
A system and method are provided for configuring an antenna array having a predetermined number of antennas. After providing an antenna correlation matrix for all antennas with regard to a mobile terminal, the antenna array is virtually partitioned into two or more sub-arrays based on th
7817088 Beamforming multiple-input multiple-output hybrid automatic repeat request retransmission October 19, 2010
Techniques are provided for improving hybrid automatic repeat request retransmissions techniques in a beamformed multiple-input multiple-output wireless communication environment. At a first device comprising a first plurality of antennas, a plurality of beamforming weight vectors are
7801239 System and method for improving the robustness of spatial division multiple access via nulling September 21, 2010
The present invention discloses a base transceiver station (BTS) equipped with a plurality of antennas for improving the robustness of spatial division multiple access via nulling. The BTS comprises of a first matrix module receiving a plurality of signals from one or more customer p
7787897 Method for up-link transmit power management in a wireless broadband terminal August 31, 2010
A method is disclosed for optimizing up-link transmit powers of a wireless broadband terminal operating in a predetermined frequency band in a multi-carrier system, the method comprising assigning a transmit signal to one or more sub-carriers of predetermined frequencies, and capping the
7778211 Method for computing a downlink beamforming weighting vector based on up link channel informatio August 17, 2010
Described herein is a method for obtaining a downlink beamforming weighting vector in a wireless communications system based on channel information about an uplink channel. The method comprises obtaining the channel information about the uplink channel by a means selected from the gr
7733949 Wireless communications system with reduced sideband noise and carrier leakage June 8, 2010
A wireless communications system is provided with reduced sideband noise and carrier leakage. In the system, at least one transmitter modulates at least one input signal with a first carrier to generate a modulated output signal, and at least one receiver receives the modulated output
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