Patents by Inventor Takahito Hashigami

Takahito Hashigami 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).

  • Amplifier gain control method and apparatus in multi-antenna radio system
    Patent number: 7912507
    Abstract: A base transceiver station (BTS) identifies the number of currently connected antenna units by receiving a signal to which 1 is added in each antenna unit via a signal line (16) connecting the antenna units (AU1 to AUn) in series. The target output power of each antenna unit, which is obtained by dividing the total target output power of the antenna units by the number of currently connected antenna units, is passed to each antenna unit via a signal line (14) connecting the antenna units in series. Each antenna unit controls the gain of a variable gain amplifier so that its output power becomes equal to the target output power.
    Type: Grant
    Filed: February 2, 2007
    Date of Patent: March 22, 2011
    Assignee: Fujitsu Limited
    Inventors: Takahito Hashigami, Toshiaki Funakubo
  • Signal processing system in wireless mobile communication system
    Patent number: 7848467
    Abstract: In a wireless mobile communication system, functions of a base transceiver station is divided and served by transmission/reception devices for communicating with mobile stations, and a signal processing device for performing base band signal processes of a plurality of channels. A plurality of transmission/reception devices and a plurality of signal processing devices are connected via a communication network. Thereby, connection relationships among the transmission/reception devices and the signal processing devices can be flexibly changed.
    Type: Grant
    Filed: August 23, 2006
    Date of Patent: December 7, 2010
    Assignee: Fujitsu Limited
    Inventor: Takahito Hashigami
  • Signal processing system in wireless mobile communication system
    Publication number: 20070274216
    Abstract: In a wireless mobile communication system, functions of a base transceiver station is divided and served by transmission/reception devices for communicating with mobile stations, and a signal processing device for performing base band signal processes of a plurality of channels. A plurality of transmission/reception devices and a plurality of signal processing devices are connected via a communication network. Thereby, connection relationships among the transmission/reception devices and the signal processing devices can be flexibly changed.
    Type: Application
    Filed: August 23, 2006
    Publication date: November 29, 2007
    Inventor: Takahito Hashigami
  • Amplifier gain control method and apparatus in multi-antenna radio system
    Publication number: 20070161408
    Abstract: A base transceiver station (BTS) identifies the number of currently connected antenna units by receiving a signal to which 1 is added in each antenna unit via a signal line (16) connecting the antenna units (AU1 to AUn) in series. The target output power of each antenna unit, which is obtained by dividing the total target output power of the antenna units by the number of currently connected antenna units, is passed to each antenna unit via a signal line (14) connecting the antenna units in series. Each antenna unit controls the gain of a variable gain amplifier so that its output power becomes equal to the target output power.
    Type: Application
    Filed: February 2, 2007
    Publication date: July 12, 2007
    Inventors: Takahito Hashigami, Toshiaki Funakubo