Patents by Inventor Jinyun Zhang

Jinyun Zhang has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20090213778
    Abstract: A hop-by-hop and multi-hop approach for fragmentation and packing are provided for a wireless multi-hop relay network. The fragmentation and packing operate at ingress, intermediate, and egress stations of a tunnel connecting a base station (BS) with an access relay station (RS). A format of the associated relay fragmentation and packing subheader are specified. In addition, a tunnel data includes numbered blocks to ensure correct packet sequencing for proper packet construction and reassembly for fragmentation and packing in the multi-hop relay network.
    Type: Application
    Filed: September 3, 2008
    Publication date: August 27, 2009
    Inventors: Zhifeng Tao, Jinyun Zhang
  • Publication number: 20090189820
    Abstract: A movable portion of an array of antenna elements receives RF signals. A movable ultra-wideband (UWB) transmitter is connected to each antenna element, via a RF to UWB converter. A fixed portion of the antenna array is separated from the movable portion by an air gap. The fixed portion includes one fixed UWB receiver for each movable UWB transmitter. An application system is connected to the fixed UWB receivers. The UWB signals from the movable transmitter are sent across the air gap to the fixed UWB receivers to be processed by the application system as the movable portion rotates.
    Type: Application
    Filed: January 25, 2008
    Publication date: July 30, 2009
    Inventors: Masashi Saito, Andreas F. Molisch, Jinyun Zhang
  • Publication number: 20090180459
    Abstract: A method communicates symbols in a cell of a multiple-input multiple-output (MIMO) network that includes a set of mobile station and a base station. The symbols are communicated using orthogonal frequency division multiplexing (OFDM) and time division duplex (TDM). A frame for communicating the symbols between the base station and the mobile station is constructed. The frame is partitioned into a downlink subframe and an uplink subframe. The uplink subframe is partitioned into a first zone and a second zone, wherein the first zone uses orthogonal frequency division multiple access (OFDMA) and the second zone uses single carrier frequency division multiple access (SC-FDMA).
    Type: Application
    Filed: September 29, 2008
    Publication date: July 16, 2009
    Inventors: Philip V. Orlik, Andreas F. Molisch, Zhifeng Tao, Jinyun Zhang
  • Publication number: 20090180568
    Abstract: A method transmits a block of symbols in a multiple-input multiple-output (MIMO) network including a transmitter having a set of transmit antennas and a receiver having a set of receive antennas. A block of symbols is coded with a first code to generate a first block, which is transmitted and received. If a decoding of the first block is incorrect, then block of symbols is coded with the first code and then a second code different than the first code to generate a second block. The second block is transmitted, received and combined with the first block to recover the block of symbols.
    Type: Application
    Filed: September 26, 2008
    Publication date: July 16, 2009
    Inventors: Philip V. Orlik, Wataru Matsumoto, Andreas F. Molisch, Zhifeng Tao, Jinyun Zhang
  • Patent number: 7562279
    Abstract: A method for decoding error-correcting codes normalizes messages generated by a bit node processor, and normalizes messages generated by the check node processor.
    Type: Grant
    Filed: May 20, 2005
    Date of Patent: July 14, 2009
    Assignee: Mitsubishi Electric Research Laboratories, Inc.
    Inventors: Juntan Zhang, Daqing Gu, Jinyun Zhang
  • Patent number: 7542446
    Abstract: A method and system transmits an input stream of data symbols in a multiple-input/multiple-output wireless communications system that includes M subgroups of transmitting antennas. A stream of data symbols is provided to a combined switch and demultiplexer. The combined switch and demultiplexer selects a subset L of the M subgroups of antennas as active, where L<M. The demultiplexer then splits the data stream into L substreams, which are fed to the L subgroups of antennas. Before transmission, each of the L substreams is adaptively modulated and coded to a maximum data rate while achieving a predetermined performance on an associated channel used to transmit the substream. Space-time transmit diversity encoding is applied to each coded substream to generate multiple output streams, one output stream for each antenna of each of the L subgroups. The selection by the switch is based on channel conditions fed back by a receiver of the output streams.
    Type: Grant
    Filed: April 21, 2004
    Date of Patent: June 2, 2009
    Assignee: Mitsubishi Electric Research Laboratories, Inc.
    Inventors: Neelesh B. Mehta, Pallav Sudarshan, Andreas F. Molisch, Jinyun Zhang
  • Publication number: 20090129501
    Abstract: A method is provided for receiving data at a receiver via a communication channel from a transmitter having at least two transmitter antennas, the method including: receiving (S204) a codebook including an assignment of at least two respective codewords to the at least two transmitter antennas, the assignment being based at least in part on a characteristic of the communication channel; detecting a state of the communication channel by which the receiver can communicate with the transmitter; selecting (S206) at least one desired transmitter antenna from the at least two antennas based at least in part on the detected state of the communication channel; transmitting (S208) to the transmitter a codeword corresponding to the at least one desired transmitter antenna; and receiving (S210) data at the receiver transmitted by the transmitter.
    Type: Application
    Filed: August 19, 2005
    Publication date: May 21, 2009
    Inventors: Neelesh B. Mehta, Yabo Li, Andreas F. Molisch, Jinyun Zhang
  • Publication number: 20090122777
    Abstract: A method and a system for selecting antennas in an orthogonal frequency division multiple access (OFDMA) network. The network includes a base station and mobile stations. The mobile station includes multiple antennas. The base station and the mobile stations communicate with each other using frames. The base station transmits a down-link (DL) subframe of the frame to the mobile station. The DL subframe allocates one or more symbols and one or more subcarriers of an up-link (UL) subframe of the frame for antenna selection signals. The mobile station transmits the UL subframe including the antenna selection signals at the allocated subcarriers and symbols to the base station. Then, the base station selects a subset of the antennas based on the antenna selection signals.
    Type: Application
    Filed: November 9, 2007
    Publication date: May 14, 2009
    Inventors: Zhifeng Tao, Jinyun Zhang
  • Publication number: 20090124290
    Abstract: A method for selects antennas in a spatial division multiple access (SDMA) wireless network that includes a base station and a set of mobile stations, in which the set of mobile stations includes one or more designated mobile stations, and in which each designated mobile station has a set of multiple antennas. Channel state information (CSI) is acquired for a channel between each mobile station in the set of mobile stations and the base station, and in which the CSI for each designated mobile station is acquired for different subsets of the set of multiple antennas at each designated mobile station. For each designated mobile station, a globally optimal subset of the set of antennas is selected based on the CSI acquired from all the mobile stations.
    Type: Application
    Filed: November 9, 2007
    Publication date: May 14, 2009
    Inventors: Zhifeng Tao, Tairan Wang, Andreas F. Molisch, Philip V. Orlik, Jinyun Zhang
  • Publication number: 20090116544
    Abstract: A multiple carrier wireless communications system includes a channel predictor, a performance predictor, and a link adapter. The channel predictor predicts channel state information for a next packet based on channel state information for the current packet. The performance predictor includes an uncoded performance predictor to predict system performance at a decoder input based on a modulation type and the predicted channel state information for the next packet, and a decoder input-output performance mapper to predict system performance at a decoder output based on a coding rate and the predicted system performance at the decoder input. The link adapter includes a link throughput controller to generate a throughput indicator based on a requested system performance and the predicted system performance at the decoder output, and a modulation and coding scheme (MCS) updater to identify a MCS based on the throughput indicator.
    Type: Application
    Filed: November 1, 2007
    Publication date: May 7, 2009
    Applicant: RENESAS TECHNOLOGY CORPORATION
    Inventors: Jinyun Zhang, Fei Peng
  • Publication number: 20090116589
    Abstract: A multiple carrier wireless communications system includes a channel predictor, a performance predictor, and a link adapter. The channel predictor is configured to predict channel state information for a next packet based on channel state information for the current packet. The performance predictor includes an uncoded performance predictor configured to predict system performance at an input of a decoder based on a modulation type and the predicted channel state information for the next packet, and a decoder input-output performance mapper configured to determine a required coding rate based on a requested system performance and the predicted system performance at the input of the decoder. The link adapter includes a modulation and coding scheme (MCS) updater configured to identify a MCS based on the required coding rate.
    Type: Application
    Filed: November 1, 2007
    Publication date: May 7, 2009
    Applicant: RENESAS TECHNOLOGY CORPORATION
    Inventors: Jinyun Zhang, Fei Peng
  • Publication number: 20090117911
    Abstract: The embodiments of the invention provide an adaptive method for base station cooperation in a wireless network. In a multi-user communications network that includes base stations, and in which each base station is associated with a cell, and in which each cell includes one or more mobile stations, each base station determines pre-coding matrices for full-cooperation, semi-cooperation and non-cooperation. Each base stations also determines a sum rate SRfull for full-cooperation, a sum rate SRsemi semi-cooperation, and a sum rate SRnon for non-cooperation. Then, each base station selects the pre-coding for full-cooperation, the pre-coding matrices for semi cooperation, or the pre-coding matrices for non cooperation. Each base station transmits signals according to the selected per-coding matrices.
    Type: Application
    Filed: November 2, 2007
    Publication date: May 7, 2009
    Inventors: Andreas F. Molisch, Lun Dong, Philip V. Orlik, Jinyun Zhang
  • Publication number: 20090111473
    Abstract: A method and system communicates cooperatively between base stations and mobile stations in a wireless cellular network. At least two mobile stations are detected in a handover region. A diversity set is established for each mobile station in the handover region. Each diversity set identifies at least two base stations that can communicate with the associated mobile station. The at least two base stations and the at least two mobile stations are combined into members of a cooperation set. A resource is allocated to selected members of the cooperative set. The selected members are notified of the allocated resource. Then, the selected base stations of the cooperation set communicate concurrently with the selected mobile stations using the same allocated resource.
    Type: Application
    Filed: October 31, 2007
    Publication date: April 30, 2009
    Inventors: Zhifeng Tao, Tairan Wang, Jinyun Zhang
  • Patent number: 7526036
    Abstract: A method transmits and receives signals in a cooperative, multi-user, multi-input, multi-output network. The network includes base stations (BSs) and mobile stations (MSs). Each BS has at least two antennas, and each MS has at least one antenna. At a first base station and a second base station using linear pre-coding matrices, a plurality of data streams are jointly pre-coded to produce first signals and second signals. The first signals are transmitted synchronously from the first BS and the second BS to a first MS, and the second signals are transmitted synchronously from the first BS and the second BS to a second MS, and in the first signal and the second signal are asynchronous with respect each other.
    Type: Grant
    Filed: April 20, 2006
    Date of Patent: April 28, 2009
    Assignee: Mitsubishi Electric Research Laboratories, Inc.
    Inventors: Neelesh B. Mehta, Hongyuan Zhang, Andreas F. Molisch, Jinyun Zhang
  • Publication number: 20090088176
    Abstract: Protocols for OFDM/OFDMA/SC-FDMA based wireless networks provide adaptive inter-cell interference management without explicit spectrum or frequency planning. Base stations and mobile stations acquire information about subcarrier allocation from a handoff protocol. The mobile stations can also acquire this information using cognitive sensing. Cognitive sensing can be rewarded by the base station. Using this information, subcarriers can be allocated randomly, with blind optimization, or by joint optimization. The stations can use game theory to select among the different optimization strategies.
    Type: Application
    Filed: September 27, 2007
    Publication date: April 2, 2009
    Inventors: Koon Hoo Teo, Yingda Chen, Philip V. Orlik, Jinyun Zhang
  • Publication number: 20090086690
    Abstract: A computer implemented method selects antennas in a multiple-input, multiple-output wireless local area network that includes multiple stations, and each station includes a set of antennas. Multiple consecutively transmitted sounding packets are received in a station. Each sounding packet corresponds to a different subset of the set of antennas. A channel matrix is estimated from the multiple consecutively transmitted sounding packets. A frame including a high throughput (HT) control field is sent to initiate a selecting of antennas, and a subset of antennas is selected according to the channel matrix.
    Type: Application
    Filed: November 21, 2005
    Publication date: April 2, 2009
    Inventors: Daqing Gu, Hongyuan Zhang, Jinyun Zhang, Andreas F. Molisch
  • Patent number: 7508811
    Abstract: A method synchronizes transmissions through a channel in a wireless communications network including a device and a multiple coordinators within transmission range of the device. A superframe is defined to include a beacon period, a contention access period, and a contention free period. The beacon period includes multiple slots. In each coordinator, a particular beacon slot is selected to be non-conflicting with beacon slots selected by other coordinators. Beacons are then transmitted to the device by the coordinators at time periods associated with the selected slots.
    Type: Grant
    Filed: July 10, 2004
    Date of Patent: March 24, 2009
    Assignee: Mitsubishi Electric Research Laboratories, Inc.
    Inventors: Huai-Rong Shao, Jinyun Zhang
  • Publication number: 20090074088
    Abstract: A method performs a hybrid automatic repeat-request (HARQ) operation in a wireless orthogonal frequency division multiple access (OFDMA) network. A quality of a channel between a transmitter and a receiver is estimated as an error metric. A packet for the HARQ operation is fragmented adaptively at the transmitter according to the estimated error metric. The fragmentation is performed at the HARQ layer when the error metric is less than a predetermined threshold, otherwise the fragmentation is performed at the MAC layer.
    Type: Application
    Filed: September 13, 2007
    Publication date: March 19, 2009
    Inventors: Zhifeng Tao, Anfei Li, Koon Hoo Teo, Jinyun Zhang
  • Publication number: 20090016372
    Abstract: A method selects antennas in an OFDMA wireless network including a base station and a mobile station. The mobile station measures a channel state of a downlink in a downlink subframe using different subsets of available antennas, and selects a subset of receive antennas for downlink reception based on the channel states between the base station and the different subsets of antennas at the mobile station. The base station measures the channel state in an uplink using an uplink subframe received in the base station from the mobile station, and selects a subset of transmit antennas for mobile station's uplink transmission based on the channel states between the base station and different subset of antennas at the mobile station.
    Type: Application
    Filed: May 8, 2008
    Publication date: January 15, 2009
    Inventors: Zhifeng Tao, Andreas F. Molisch, Philip V. Orlik, Jinyun Zhang, Shigeru Uchida, Kentarou Sawa
  • Publication number: 20090016312
    Abstract: A method selects antennas in an OFDMA network. A channel state of a downlink is measured using a downlink subframe received in a mobile station from a base station. A channel state of an uplink is measured using an uplink subframe received in the base station from the mobile station. Next, the method compares the channel states to determine whether the downlink and the uplink are reciprocal or not. The mobile station can perform receive antenna selection based on the quality of the downlink channel state. The mobile station can also perform transmit antenna selection when instructed by the base station.
    Type: Application
    Filed: July 13, 2007
    Publication date: January 15, 2009
    Inventors: Zhifeng Tao, Chun Nie, Neelesh B. Mehta, Andreas F. Molisch, Jinyun Zhang