Patents by Inventor Yusuke Asai

Yusuke Asai 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).

  • WIRELESS COMMUNICATION SYSTEM, INTERFERENCE CANCELLING STATION, AND INTERFERENCE CANCELLING METHOD
    Publication number: 20100291877
    Abstract: An interference cancelling station ICS includes a transmission weight factor calculating unit calculating a transmission weight factor w2 and an interference cancelling data signal transmitting unit generating an interference cancelling data signal by multiplying, by the transmission weight factor w2, a data signal transmitted by a base station BSb of the wireless communication system B and transmitting the interference cancelling data signal in synchronization with timing with which the base station BSb of a wireless communication system B transmits the data signal, and a mobile station MSa of a wireless communication system A receives a data signal transmitted by a base station BSa of the wireless communication system A, the data signal having cancelled interference from the base station BSb of the wireless communication system B.
    Type: Application
    Filed: February 5, 2009
    Publication date: November 18, 2010
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Jun Mashino, Takatoshi Sugiyama, Kentaro Nishimori, Kengo Nagata, Yusuke Asai
  • OFDM communication method and OFDM communication device
    Patent number: 7463577
    Abstract: When OFDM signals are transmitted from a plurality of antennas, a pilot carrier is transmitted from one antenna among the plurality of antennas, and a null signal is transmitted from an antenna other than that antenna by a subcarrier of the frequency band that transmits the pilot carrier.
    Type: Grant
    Filed: April 9, 2003
    Date of Patent: December 9, 2008
    Assignee: Panasonic Corporation
    Inventors: Hiroaki Sudo, Takatoshi Sugiyama, Yusuke Asai
  • OFDM signal communication system, OFDM signal transmitting device and OFDM signal receiving device
    Patent number: 7242720
    Abstract: An OFDM signal communication system used in broadband mobile communication, achieves stable operation under severe frequency selective fading environments, giving high quality. The OFDM signal communication system which transmits OFDM signals over the same radio frequency from N transmitting antennas, has an inverse matrix computer for computing an N×N inverse matrix constituted by propagation coefficients for respective propagation paths between each of N transmitting antennas and each of N receiving antennas, and a subcarrier demodulator which separates the signals of the respective propagation paths, based on the obtained inverse matrix.
    Type: Grant
    Filed: April 5, 2002
    Date of Patent: July 10, 2007
    Assignee: Nippon Telegraph and Telephone Corporation
    Inventors: Takatoshi Sugiyama, Yusuke Asai, Satoshi Kurosaki, Masahiro Umehira, Daisei Uchida, Yasuo Suzuki
  • Ofdm communication method and ofdm communication device
    Publication number: 20040233838
    Abstract: When OFDM signals are transmitted from a plurality of antennas, a pilot carrier is transmitted from one antenna among the plurality of antennas, and a null signal is transmitted from an antenna other than that antenna by a subcarrier of the frequency band that transmits the pilot carrier.
    Type: Application
    Filed: March 4, 2004
    Publication date: November 25, 2004
    Inventors: Hiroaki Sudo, Takatoshi Sugiyama, Yusuke Asai
  • OFDM signal communication system, OFDM signal transmitting device and OFDM signal receiving device
    Publication number: 20020191535
    Abstract: An OFDM signal communication system used in broadband mobile communication, achieves stable operation under severe frequency selective fading environments, giving high quality. The OFDM signal communication system which transmits OFDM signals over the same radio frequency from N transmitting antennas, has an inverse matrix computer for computing an N×N inverse matrix constituted by propagation coefficients for respective propagation paths between each of N transmitting antennas and each of N receiving antennas, and a subcarrier demodulator which separates the signals of the respective propagation paths, based on the obtained inverse matrix.
    Type: Application
    Filed: April 5, 2002
    Publication date: December 19, 2002
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Takatoshi Sugiyama, Yusuke Asai, Satoshi Kurosaki, Masahiro Umehira, Daisei Uchida, Yasuo Suzuki