Patents by Inventor Yoshiyasu Hirayama

Yoshiyasu Hirayama 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 reception apparatus and directivity reception method
    Patent number: 6888501
    Abstract: Delay profile creation sections 7 and 8 create a delay profile for each of fixed directivity reception signals combined using a plurality of fixed weight patterns. A path search section 11 detects a delay profile in which the maximum peak has appeared. An initial value weight selection section 12 selects the fixed weight corresponding to the delay profile in which the maximum peak has appeared as an initial value weight. An adaptive array antenna reception control section 13 uses this initial value weight as the initial value of an optimization algorithm to calculate the optimal weight of the adaptive array antenna. Thus, it is possible to reduce the time required to calculate the optimal weight by means of the optimization algorithm.
    Type: Grant
    Filed: September 18, 2002
    Date of Patent: May 3, 2005
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Yoshiyasu Hirayama, Takahisa Aoyama
  • Radio reception apparatus and directivity reception method
    Publication number: 20040058711
    Abstract: Delay profile creation sections 7 and 8 create a delay profile for each of fixed directivity reception signals combined using a plurality of fixed weight patterns. A path search section 11 detects a delay profile in which the maximum peak has appeared. An initial value weight selection section 12 selects the fixed weight corresponding to the delay profile in which the maximum peak has appeared as an initial value weight. An adaptive array antenna reception control section 13 uses this initial value weight as the initial value of an optimization algorithm to calculate the optimal weight of the adaptive array antenna. Thus, it is possible to reduce the time required to calculate the optimal weight by means of the optimization algorithm.
    Type: Application
    Filed: July 2, 2003
    Publication date: March 25, 2004
    Inventors: Yoshiyasu Hirayama, Takahisa Aoyama