Patents Examined by Hguyen Vo
  • Cellular telephone system capable of reducing IM distortion at portable telephone
    Patent number: 5239683
    Abstract: A cellular telephone system includes a plurality of base stations which cover a plurality of cells. The system also includes a plurality of portable telephones communicable with the base station over radio frequency channels. A base station covering a given cell transmits an IM control signal indicating that there exists IM interference in the given cell. In response to the IM control signal, each of the portable telephones reduces its receiver sensitivity, so that the IM interference can be alleviated.
    Type: Grant
    Filed: October 31, 1990
    Date of Patent: August 24, 1993
    Assignee: NEC Corporation
    Inventor: Hisayoshi Usui