Patents by Inventor Tadayoshi Itou

Tadayoshi Itou 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).

  • Radio base station and program for radio base station
    Patent number: 7623488
    Abstract: A wireless base station comprises a response vector calculation unit (561), an RSSI measuring unit (562), an MSE calculation unit (563), an FD calculation unit (564) and the like, and those units obtain an index showing communication quality of at least one of two mobile stations that are intended to be space-division multiplexed. According to the index, a control unit (80) judges the suitability of the two mobile stations for space-division multiplexing and performs space-division multiple access communication when judging suitable. The effect achieved with this construction is that the wireless base station maintains quality of communication between the wireless base station and mobile stations at a certain satisfactory level when performing space-division multiple access communication.
    Type: Grant
    Filed: August 27, 2001
    Date of Patent: November 24, 2009
    Assignee: Kyocera Corporation
    Inventors: Takeo Miyata, Tadayoshi Itou
  • Radio device with transmission directivity, and control method and control program for the radio device
    Patent number: 7233811
    Abstract: In an adaptive array (2000), fading rate of a user is measured by a fading rate measuring circuit (2300), and the transmit weight vector is weighted in accordance with the fading rate by a transmitting circuit (2400). Thus, transmission power is increased for a user of which fading rate is large, and thus transmission directivity control for such a user becomes possible.
    Type: Grant
    Filed: December 21, 2001
    Date of Patent: June 19, 2007
    Assignee: Sanyo Electric Co., Ltd.
    Inventors: Masashi Iwami, Yoshiharu Doi, Tadayoshi Itou, Toshinori Iinuma
  • Radio base station and program recorded medium
    Patent number: 7155162
    Abstract: A frequency estimation unit (57) and a timing estimation unit (58) respectively detect a frequency offset and a timing offset from a signal received from a mobile station via a control channel. A weight calculation unit (53) corrects reception signals received via a communication channel, using the detected frequency offset and timing offset when new wireless connection to the mobile station is performed by forming an antenna directivity. A signal intended for the mobile station is separated from the corrected reception signals with high accuracy.
    Type: Grant
    Filed: March 30, 2001
    Date of Patent: December 26, 2006
    Assignee: Sanyo Electric Co., Ltd.
    Inventors: Yoshiharu Doi, Tadayoshi Itou
  • Radio device with transmission directivity, and control method and control program for the radio device
    Publication number: 20040053581
    Abstract: In an adaptive array (2000), fading rate of a user is measured by a fading rate measuring circuit (2300), and the transmit weight vector is weighted in accordance with the fading rate by a transmitting circuit (2400). Thus, transmission power is increased for a user of which fading rate is large, and thus transmission directivity control for such a user becomes possible.
    Type: Application
    Filed: June 23, 2003
    Publication date: March 18, 2004
    Inventors: Masashi Iwami, Yoshiharu Doi, Tadayoshi Itou, Toshinori Iinuma
  • Radio base station and program for radio base station
    Publication number: 20040022205
    Abstract: A wireless base station comprises a response vector calculation unit (561), an RSSI measuring unit (562), an MSE calculation unit (563), an FD calculation unit (564) and the like, and those units obtain an index showing communication quality of at least one of two mobile stations that are intended to be space-division multiplexed. According to the index, a control unit (80) judges the suitability of the two mobile stations for space-division multiplexing and performs space-division multiple access communication when judging suitable. The effect achieved with this construction is that the wireless base station maintains quality of communication between the wireless base station and mobile stations at a certain satisfactory level when performing space-division multiple access communication.
    Type: Application
    Filed: August 4, 2003
    Publication date: February 5, 2004
    Inventors: Takeo Miyata, Tadayoshi Itou
  • Radio base station and program recorded medium
    Publication number: 20030139152
    Abstract: A frequency estimation unit (57) and a timing estimation unit (58) respectively detect a frequency offset and a timing offset from a signal received from a mobile station via a control channel. A weight calculation unit (53) corrects reception signals received via a communication channel, using the detected frequency offset and timing offset when new wireless connection to the mobile station is performed by forming an antenna directivity. A signal intended for the mobile station is separated from the corrected reception signals with high accuracy.
    Type: Application
    Filed: September 30, 2002
    Publication date: July 24, 2003
    Inventors: Yoshiharu Doi, Tadayoshi Itou