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Method and apparatus for spread spectrum code pulse position modulation

  • US 5,596,601 A
  • Filed: 08/30/1994
  • Issued: 01/21/1997
  • Est. Priority Date: 08/30/1994
  • Status: Expired due to Term
First Claim
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1. An apparatus for transmitting information across a communication channel, said apparatus comprising:

  • a first spread spectrum code generator for generating a first or second spread spectrum codeword to convey at least one bit of information, said codewords consisting of a plurality of chips transmitted during a symbol duration, said codewords having a main lobe in one of said chip positions upon matched filtering in a receiver;

    said first spread spectrum code generator further comprising a means for modulating the position of said codeword generated by said first spread spectrum code generator relative to the center of said symbol duration to modulate the position of said main lobe in said receiver output to convey one or more additional bits of information;

    a first carrier signal source;

    a modulator connected to said first spread spectrum code generator and said first carrier signal source, said modulator generating a first carrier signal modulated by said generated codeword having its position modulated relative to the center of said symbol duration; and

    means for applying said modulated carrier signal to an input of said communication channel.

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