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Method for code division multiple access communication with increased capacity through self-noise reduction

  • US 7,269,126 B2
  • Filed: 09/15/2003
  • Issued: 09/11/2007
  • Est. Priority Date: 05/06/1998
  • Status: Expired due to Fees
First Claim
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1. A method of constructing orthogonal codes of length N for use in a network utilizing quasi-synchronous code division multiple access combined with time division duplexing, the method comprising:

  • a) determining the balanced vectors of length N, being all possible cross-correlation vectors resulting from zero cross-correlation of codes of length N;

    b) providing an arbitrary code of length N;

    c) performing bitwise XOR-ing with all the balanced vectors determined in a), to produce a set of codes with which the arbitrary code is orthogonal;

    d) performing bitwise XOR-ing of the balanced vectors determined in a);

    e) adding the code to a set of orthogonal codes if the result of d) is balanced;

    f) performing a) through e) until the set of orthogonal codes contains maximally N orthogonal codes; and

    g) applying the set of orthogonal codes to a plurality of data streams in the network so as to provide spread spectrum data streams.

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