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Method of synchronizing satellite switched CDMA communication system

  • US 5,838,669 A
  • Filed: 08/28/1996
  • Issued: 11/17/1998
  • Est. Priority Date: 08/28/1996
  • Status: Expired due to Term
First Claim
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1. A method of synchronizing CDMA processing in a satellite communication system connecting multi-point ground stations, comprising the steps of:

  • acquiring access and Synchronization signals transmitted by a satellite at a terrestrial subscriber unit;

    setting a reference propagation delay time;

    establishing a propagation delay in terms of arrival of a message in relation to one of a plurality of quantified timing marks subsequent to the reference propagation delay time, when the satellite receives a first signal from the terrestrial subscriber unit on an access channel;

    conveying the established quantified propagation delay to the terrestrial subscriber unit;

    adjusting timing of uplink CDMA code chips at the terrestrial subscriber unit from the original reference propagation delay derived from the access channel;

    tracking synchronizing by adjusting code delay of the uplink arrival time of a reference code; and

    retaining synchronization by downlink code delay transmission.

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