Patents by Inventor Kazuhiro Umetsu

Kazuhiro Umetsu 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).

  • Patent number: 6236648
    Abstract: In a CDMA receiver, an A/D converter over-samples an analog reception baseband signal with a sampling clock a frequency of which is 2n times higher than a chip clock, and converts it into a digital reception baseband signal. A correlator obtains a correlation value between the digital reception baseband signal and a pilot spreading code which is synchronous with a reception timing. A phase difference detecting unit obtains a phase difference between the digital reception baseband signal and the reception timing based on the correlation value. A timing controlling unit changes the reception timing in such a manner as to eliminate the phase difference obtained by the phase difference detecting unit.
    Type: Grant
    Filed: April 20, 1998
    Date of Patent: May 22, 2001
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventor: Kazuhiro Umetsu
  • Patent number: 5960336
    Abstract: A data receiving apparatus is constructed to make comparison of received signal strength of a plurality of receiving antennas by making use of timing of a sync word, which is not necessary for making synchronization acquisition, among a plurality of sync words contained in a subframe of a receiving signal, and then to select a receiving antenna of the highest received signal strength from among the plurality of receiving antennas, in accordance with a result of the comparison made before then.
    Type: Grant
    Filed: May 6, 1997
    Date of Patent: September 28, 1999
    Assignees: Matsushita Communication Industrial Co., Ltd., NTT Mobile Communications Network Inc.
    Inventors: Keiichi Ikawa, Tetsuaki Nakanishi, Kazuhisa Tsubaki, Kazuhiro Umetsu, Tadao Takami