Patents by Inventor Hideya Yamamura

Hideya Yamamura 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).

  • Diversity control method and wireless communication apparatus
    Patent number: 7212800
    Abstract: A wireless communication apparatus is equipped with a plurality of antennas. A switch leads a received signal by way of an antenna selected according to an antenna switching signal to a demodulator unit. Software installed in a MAC unit generates a first switching signal. A diversity control unit generates a second switching signal by the built-in hardware circuit. The first switching signal is used as an antenna switching signal during a packet receiving ready period, while the second switching signal is used as an antenna switching signal during a period for receiving a packet.
    Type: Grant
    Filed: March 4, 2005
    Date of Patent: May 1, 2007
    Assignee: Kabushiki Kaisha Toyota Jidoshokki
    Inventors: Takashi Ogawa, Hideya Yamamura, Koji Hika
  • Diversity control method and wireless communication apparatus
    Publication number: 20050197086
    Abstract: A wireless communication apparatus is equipped with a plurality of antennas. A switch leads a received signal by way of an antenna selected according to an antenna switching signal to a demodulator unit. Software installed in a MAC unit generates a first switching signal. A diversity control unit generates a second switching signal by the built-in hardware circuit. The first switching signal is used as an antenna switching signal during a packet receiving ready period, while the second switching signal is used as an antenna switching signal during a period for receiving a packet.
    Type: Application
    Filed: March 4, 2005
    Publication date: September 8, 2005
    Applicant: Kabushiki Kaisha Toyota Jidoshokki
    Inventors: Takashi Ogawa, Hideya Yamamura, Koji Hika
  • Spread spectrum communication system
    Patent number: 6009117
    Abstract: A convolutional coding unit generates transmission data by performing an error correcting code process for sending data. A mapping unit arranges the transmission data at signal points corresponding to the data value. A PN sequence generating unit generates a PN sequence based on part of the transmission data. A spreading unit spreads a transmission signal by multiplying an output of the mapping unit by the PN sequence generated with the PN sequence generating unit. A despreading unit detects the PN sequence used on a transmitting side, and despreads the received signal by using the detected PN sequence. A remapping unit obtains the transmission data from the signal points at which the received signal is arranged. A supplementary information processing unit obtains supplementary information based on the detected PN sequence. A Viterbi decoding unit regenerates the sending data from the transmission data by using the supplementary information.
    Type: Grant
    Filed: September 16, 1997
    Date of Patent: December 28, 1999
    Assignee: Kabushiki Kaisha Toyoda Jidoshokki Seisakusho
    Inventor: Hideya Yamamura