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Radio information communication system using multi-carrier spread spectrum transmission system

  • US 5,561,686 A
  • Filed: 02/23/1994
  • Issued: 10/01/1996
  • Est. Priority Date: 08/23/1991
  • Status: Expired due to Fees
First Claim
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1. A radio information communication system for transmitting data between a plurality of radio stations via a radio transmission path, characterized in that;

  • said radio station comprises;

    dividing means for dividing at least part of a transmission data string into a plurality of bit strings and outputting the same;

    primary modulation means for performing (primary modulation on) a plurality of first carrier signals of different frequencies based on the plurality of bit strings output from said dividing means;

    secondary modulation means having receiving means for receiving a hopping synchronization signal periodically transmitted from another radio station and containing information representing at least the hopping timing, for performing (secondary modulation on) the plurality of first carrier signals modulated by said primary modulation means by a frequency hopping system according to the hopping synchronization signal received by said receiving means and outputting a plurality of second carrier signals performed to the secondary modulation;

    transmission means for transmitting the plurality of second carrier signals output from said secondary modulation means to said radio transmission path in parallel; and

    hopping window setting means for setting a frequency hopping window in a preset period including a reception period of the hopping synchronization signal and the hopping timing and interrupting transmission of the second carrier signal in a period in which said frequency hopping window is set.

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