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Composite spread spectrum signal including modulator demodulator

  • US 5,469,469 A
  • Filed: 12/07/1993
  • Issued: 11/21/1995
  • Est. Priority Date: 12/07/1993
  • Status: Expired due to Fees
First Claim
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1. A method of transmitting information by generating a spread-spectrum modulated signal and transmitting the signal over a communications link, the method comprising:

  • determining selected chipping sequences from a plurality of possible chipping sequences for message bundles in response to data to be transmitted;

    determining starting positions of said selected chipping sequences in response to data to be transmitted;

    modulating a carrier signal with the selected chipping sequences and beginning the selected chipping sequences at the starting positions to perform simultaneously code shift key modulation and pulse position modulation for the message bundles; and

    repeating at least a portion of said selected chipping sequences beginning at the starting positions in every message bundle for at least as long as multipath delays over the communications link.

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