Patents by Inventor Anxin Li

Anxin Li 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).

  • Patent number: 8385453
    Abstract: A data processing method and a base station for downlink transmit diversity are disclosed. One embodiment of the method comprises: obtaining data symbol groups formed by arranging a first type data symbol and a second type data symbol in an interval, wherein the first type data symbol is more important; determining a first antenna port pairing mode corresponding to a current slot; performing, for OFDM symbols including the reference signal in the current slot, an antenna port and subcarrier mapping on symbols in a transmit diversity matrix corresponding to the data symbol groups according to the first antenna port pairing mode, wherein a subcarrier in which a symbol related to the first type data symbol is located is nearer to a subcarrier in which a reference signal at the same antenna port is located; and performing an inverse fast fourier transform and a cyclic prefix insertion processing on symbols mapped to subcarriers and then mapping the time domain symbols to a physical antenna for transmission.
    Type: Grant
    Filed: July 9, 2010
    Date of Patent: February 26, 2013
    Assignee: NTT DoCoMo, Inc.
    Inventors: Anxin Li, Yuan Yan, Xinying Gao, Hidetoshi Kayama
  • Patent number: 8107439
    Abstract: The present invention discloses a method and apparatus of physical resource allocation as well as a method of data receiving and a receiving end in a wireless communication system. The method of physical resource allocation includes: detecting a pilot signal sent by each user within a designated range; obtaining received power of the pilot signal sent by each user; scheduling each user within the designated range to obtain a user group including at least one user according to the received power; and allocating a same physical resource to each user of the user group. According to the method and the apparatus, it is possible to reuse a physical resource and sequentially decode data packets corresponding to users in a user group occupying the same physical resource according to the Capture Effect and interference cancellation technology, thereby improving the spectrum efficiency and throughput of uplink or downlink greatly.
    Type: Grant
    Filed: March 2, 2009
    Date of Patent: January 31, 2012
    Assignee: NTT DoCoMo, Inc.
    Inventors: Yuan Yan, Anxin Li, Xiangming Li, Hidetoshi Kayama
  • Patent number: 7965785
    Abstract: A method is provided for MIMO uplink communications between a base station and a wireless station with more than two antennae. The method includes: (a) negotiating between the base station and the wireless station uplink MIMO/cooperative MIMO capabilities, using a message exchange protocol in which a message exchanged comprises a field for specifying uplink MIMO/cooperative MIMO capabilities; (b) the base station receiving a request from the wireless station for data transmission; (c) the base station sending the wireless station an allocated resource and an uplink MIMO/cooperative MIMO method for uplink transmission; (e) the wireless station mapping data symbols to the allocated resource with proper pilot pattern; and (f) the base station detecting the data symbols from the channel.
    Type: Grant
    Filed: October 31, 2007
    Date of Patent: June 21, 2011
    Assignee: NTT DOCOMO, Inc.
    Inventors: Anxin Li, Xiangming Li, Hidetoshi Kayama, Ismail Guvenc, Moo Ryong Jeong
  • Publication number: 20110013713
    Abstract: A data processing method and a base station for downlink transmit diversity are disclosed. One embodiment of the method comprises: obtaining data symbol groups formed by arranging a first type data symbol and a second type data symbol in an interval, wherein the first type data symbol is more important; determining a first antenna port paring mode corresponding to a current slot; performing, for OFDM symbols including reference signals in the current slot, an antenna port and subcarrier mapping on symbols in a transmit diversity matrix corresponding to the data symbol group according to the first antenna port paring mode, wherein a subcarrier in which a symbol related to the first type data symbol is located is nearer to a subcarrier in which a reference signal at the same antenna port is located; and performing an inverse fast fourier transform and a cyclic prefix insertion processing on symbols mapped to subcarriers and then mapping the symbols to a physical antenna for transmission.
    Type: Application
    Filed: July 9, 2010
    Publication date: January 20, 2011
    Inventors: Anxin Li, Yuan Yan, Xinying Gao, Hidetoshi Kayama
  • Publication number: 20090232073
    Abstract: The present invention discloses a method and apparatus of physical resource allocation as well as a method of data receiving and a receiving end in a wireless communication system. The method of physical resource allocation includes: detecting a pilot signal sent by each user within a designated range; obtaining received power of the pilot signal sent by each user; scheduling each user within the designated range to obtain a user group including at least one user according to the received power; and allocating a same physical resource to each user of the user group. According to the method and the apparatus, it is possible to reuse a physical resource and sequentially decode data packets corresponding to users in a user group occupying the same physical resource according to the Capture Effect and interference cancellation technology, thereby improving the spectrum efficiency and throughput of uplink or downlink greatly.
    Type: Application
    Filed: March 2, 2009
    Publication date: September 17, 2009
    Inventors: Yuan Yan, Anxin Li, Xiangming Li, Hidetoshi Kayama
  • Publication number: 20080247488
    Abstract: A method is provided for MIMO uplink communications between a base station and a wireless station with more than two antennae. The method includes: (a) negotiating between the base station and the wireless station uplink MIMO/cooperative MIMO capabilities, using a message exchange protocol in which a message exchanged comprises a field for specifying uplink MIMO/cooperative MIMO capabilities; (b) the base station receiving a request from the wireless station for data transmission; (c) the base station sending the wireless station an allocated resource and an uplink MIMO/cooperative MIMO method for uplink transmission; (e) the wireless station mapping data symbols to the allocated resource with proper pilot pattern; and (f) the base station detecting the data symbols from the channel.
    Type: Application
    Filed: October 31, 2007
    Publication date: October 9, 2008
    Inventors: Anxin Li, Xiangming Li, Hidetoshi Kayama, Ismail Guvenc, Moo Ryong Jeong
  • Publication number: 20080013641
    Abstract: One embodiment of the present invention provides a data transmission method, including: performing a serial-to-parallel conversion for input date stream, obtaining 4 parallel data streams and partitioning the 4 parallel data streams into 2 groups; performing trellis encoding for one group and selecting one basic codeword subset from all basic codeword subsets according to the trellis encoding output; performing trellis encoding for one data stream in the other group and selecting one phase subset from all phase subsets according to the trellis encoding output, and selecting a phase value from the selected phase subset according to another data stream in the other group; rotating the codeword selected from the basic codeword subset by the selected phase value and obtaining and transmitting an output codeword to a data receive-side. One embodiment of the present invention also includes another data transmission method and two data transmission apparatuses.
    Type: Application
    Filed: June 21, 2007
    Publication date: January 17, 2008
    Inventors: Anxin Li, Mingshu Wang, Xiangming Li, Hidetoshi Kayama