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Upstream frequency control for DOCSIS based satellite systems

  • US 20040042574A1
  • Filed: 01/28/2003
  • Published: 03/04/2004
  • Est. Priority Date: 09/03/2002
  • Status: Active Grant
First Claim
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1. A method for minimizing frequency error of satellite modems at a satellite gateway, comprising:

  • locking downstream baud rate and elements controlling upstream frequency to a master frequency reference;

    sending upstream satellite frequency offset information to satellite modems;

    enabling each satellite modem to lock each satellite modem'"'"'s master oscillator to a recovered baud rate; and

    enabling each satellite modem to calculate an upstream frequency offset, wherein said upstream frequency offset is compensated for by shifting a center frequency of each of said satellite modems.

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