Patents by Inventor Yasuhiro Ohnaka

Yasuhiro Ohnaka 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 base station apparatus and system to avoid preamble interference
    Patent number: 8139557
    Abstract: A radio base-station apparatus with improved frame transmission efficiency by avoiding interference of preambles and frame control information between sectors of a cell or between cells with a frequency reuse factor. In the apparatus OFDMA multiple-access processing is performed for each of a plurality of sectors of a cell, and frames made of logical subchannel numbers and OFDMA symbol numbers are configured in synchronization respectively for the plurality of sectors, and offsets are added to the beginnings of given frames such that the preambles and frame control information arranged sequentially from the beginnings of the frames do not overlap on the OFDMA symbol numbers.
    Type: Grant
    Filed: September 30, 2005
    Date of Patent: March 20, 2012
    Assignee: Mitsubishi Electric Corporation
    Inventors: Tsuyoshi Tominaga, Kunio Satou, Yasuhiro Ohnaka, Takeshi Fukunaga
  • Wireless Base Station Apparatus and Wireless Communication System Using That Apparatus
    Publication number: 20080253355
    Abstract: A radio base-station apparatus with improved frame transmission efficiency by avoiding interference of preambles and frame control information between sectors of a cell or between cells with a frequency reuse factor. In the apparatus OFDMA multiple-access processing is performed for each of a plurality of sectors of a cell, and frames made of logical subchannel numbers and OFDMA symbol numbers are configured in synchronization respectively for the plurality of sectors, and offsets are added to the beginnings of given frames such that the preambles and frame control information arranged sequentially from the beginnings of the frames do not overlap on the OFDMA symbol numbers.
    Type: Application
    Filed: September 30, 2005
    Publication date: October 16, 2008
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Tsuyoshi Tominaga, Kunio Satou, Yasuhiro Ohnaka, Takeshi Fukunaga