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Cyclic code phase multiple access for inbound satellite communications

  • US 6,108,317 A
  • Filed: 11/01/1996
  • Issued: 08/22/2000
  • Est. Priority Date: 11/01/1995
  • Status: Expired due to Fees
First Claim
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1. In a satellite communications system, a synchronous satellite terminal (ST) for receiving outbound communication signals from a hub and for transmitting inbound communication signals to the hub, the ST comprising:

  • a chip rate clock generator that recovers a bit timing clock signal received by the satellite terminal and generates a chip rate clock signal;

    a pseudo-noise (PN) code generator that receives the chip rate clock signal and a bit rate clock signal, and generates a cyclic shift inphase (I) PN code sequence and a cyclic shift quadrature (Q) PN code sequence;

    a differential encoder that differentially encodes data;

    a spreader that utilizes the I and Q PN code sequences to spread the encoded data; and

    a phase-shift keying modulator that receives the spread data and modulates a carrier with the spread data for transmission to the hub.

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