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Spread spectrum CDMA communications system

  • US 5,588,020 A
  • Filed: 09/12/1994
  • Issued: 12/24/1996
  • Est. Priority Date: 12/05/1990
  • Status: Expired due to Term
First Claim
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1. A spread spectrum CDMA communications system for communicating data between a plurality of PCN units, said spread spectrum CDMA communications system located within a same geographical region as occupied by a mobile cellular system with each cell of the mobile cellular system having a cellular bandwidth divided into predetermined channels with guard bands between the predetermined channels, and having cellular-users communicating on the predetermined channels, said spread spectrum CDMA communications system comprising:

  • a plurality of PCN-base stations located within the mobile cellular system for communicating data to the plurality of PCN units, each of said plurality of PCN-base stations including,a base modulator for converting the format of the data into a form suitable for communicating over radio waves;

    a pseudorandom generator for generating a selected-chip code;

    a product device coupled to said pseudorandom generator and to said base modulator, for spread spectrum processing the converted data from said base modulator with the selected-chip code; and

    a transmitter coupled to said product device for transmitting across the cellular bandwidth, the spread-spectrum-processed-converted data to a PCN unit;

    a plurality of PCN units, each of said plurality of PCN units including,a PCN antenna; and

    PCN detection means coupled to said PCN antenna and including PCN-spread-spectrum-processing means, for recovering the spread-spectrum-processed-converted data communicated from each of said plurality of PCN-base stations.

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