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Method and system providing unified DPSK-PSK signalling for CDMA-based satellite communications

  • US 6,072,770 A
  • Filed: 03/04/1997
  • Issued: 06/06/2000
  • Est. Priority Date: 03/04/1997
  • Status: Expired due to Term
First Claim
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1. A method for signaling in a CDMA-based satellite communications network, comprising the steps of:

  • receiving an RF signal over an uplink, the RF signal containing a coded user message that has been differentially phase encoded, and spread using two code sequences associated with the uplink;

    non-coherently quadrature demodulating the RF signal into quadrature baseband components;

    despreading the quadrature baseband components using the two code sequences associated with the uplink;

    phase comparing consecutive blocks of the despread quadrature baseband components for regenerating the differential phase signal carrying the coded user message;

    switching the regenerated differential phase signal to a selected downlink transmitter;

    respreading the quadrature baseband components of the differential phase signal using two code sequences associated with a downlink; and

    impressing the respread quadrature baseband components of the differential phase signal onto quadrature components of a downlink carrier to form a downlink RF signal.

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