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Synchronous spread-spectrum communications system and method

  • US 5,420,896 A
  • Filed: 06/11/1993
  • Issued: 05/30/1995
  • Est. Priority Date: 12/14/1990
  • Status: Expired due to Term
First Claim
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1. A spread-spectrum communications system for communicating message data comprising:

  • first generic means for generating a generic-chip-code signal;

    spreading means for spread-spectrum processing the message data, synchronized with the generic chip-code signal, as spread-spectrum-processed-message data;

    combiner means for combining the generic-chip-code signal with the spread-spectrum-processed-message data, thereby generating a base code-division-multiplex (CDM) signal;

    transmitter means for transmitting, using radio waves traversing free space, the CDM signal over a communications channel;

    detection means, coupled to said communications channel, for detecting the generic-chip-code signal embedded in the CDM signal, said detection means including,receiving means for receiving the CDM signal;

    second generic means, coupled to said receiving means, for detecting the generic-chip-code signal embedded in the CDM signal and for generating a replica of the first generic-chip-code signal;

    despreading means, synchronized with the replica of the first generic-chip-code signal, for despreading the spread-spectrum-processed-message data as a despread signal; and

    data detection means, synchronized with the replica of the first generic-chip-code signal, for detecting message data in the despread signal.

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