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Bi-orthogonal code division multiple access system

  • US 6,198,719 B1
  • Filed: 02/27/1998
  • Issued: 03/06/2001
  • Est. Priority Date: 02/27/1998
  • Status: Expired due to Fees
First Claim
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1. A bi-orthogonal base station apparatus for communicating in a code division multiple access system, the system comprising a radiotelephone communicating with a plurality of base stations over a channel, the apparatus comprising:

  • a memory that stores a plurality of 2n-bit Walsh codes, the memory coupled to and addressed by two n-bit addresses such that a first Walsh code and a second Walsh code, orthogonal to the first Walsh code, are output from the memory, both the first and second Walsh codes being orthogonal to any other system Walsh codes;

    a first shift register, coupled to the memory, for receiving the first Walsh code in a parallel format and shifting out the first Walsh code in a serial format;

    a second shift register, coupled to the memory, for receiving the second Walsh code in the parallel format and shifting out the second Walsh code in the serial format;

    a multiplexer, coupled to the first and second shift registers, for integrating the first and second Walsh codes into a single serial bit stream; and

    a quadrature phase shift keying modulator, coupled to the multiplexer, for modulating the serial bit stream for transmission over the channel.

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