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Method and apparatus for bifurcating signal transmission over in-phase and quadrature phase spread spectrum communication channels

  • US 5,414,728 A
  • Filed: 11/01/1993
  • Issued: 05/09/1995
  • Est. Priority Date: 11/01/1993
  • Status: Expired due to Term
First Claim
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1. A modulation system for modulating first and second information signals for transmission in a spread spectrum communication system to first and second system user, said communication system being operative at a predefined nominal data rate, said modulation system comprising:

  • a PN signal generator for generating in-phase pseudorandom noise (PNI) and quadrature phase pseudorandom noise (PNQ) signals of predetermined PN codes;

    means for generating a first orthogonal function signal of a predefined length based on said nominal data rate;

    a modulation network for combining said PNI signal with said first information signal and said first orthogonal function signal to provide an I modulation signal, and for combining said PNQ signal with said second information signal and said first orthogonal function signal to provide a Q modulation signal; and

    a transmit modulator for modulating in-phase (I) and quadrature phase (Q) carrier signals of a predefined phase relationship with said I and Q modulation signals for transmission to said first and second system user, respectively.

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