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Orthogonal code division multiple access waveform format for use in satellite based cellular telecommunications

  • US 6,731,614 B1
  • Filed: 10/11/2000
  • Issued: 05/04/2004
  • Est. Priority Date: 10/30/1996
  • Status: Expired due to Term
First Claim
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1. A system for providing a telecommunications link between earth stations and terminals via satellites, said system comprising:

  • a satellite, said satellite maintaining forward and return communications channels over forward and return communications links, respectively, between an earth station and a plurality of terminals;

    a plurality of terminals, said terminals utilizing orthogonal CDMA codes to maintain forward communications links synchronous with one another; and

    an earth station, said earth station utilizing orthogonal CDMA codes to maintain return communications links from multiple terminals synchronous with one another, said earth station measuring and calculating chip timing error correction information for said return communications links based on a sync field in said communications links, and transmitting, to at least one terminal, said chip timing error correction information over a loop signaling channel, said at least one terminal updating chip timing error information using said chip timing error correction information received.

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