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Reception-synchronization protecting device and reception-synchronization protection method

  • US 6,229,848 B1
  • Filed: 11/23/1999
  • Issued: 05/08/2001
  • Est. Priority Date: 11/24/1998
  • Status: Expired due to Fees
First Claim
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1. A reception-synchronization protecting device comprising:

  • strength measuring means for measuring a signal strength of a CCS (Common Line Signal) signal contained in a received frame and producing a measured result;

    S/N ratio estimating means for estimating an S/N (a Signal-to-Noise) ratio of the received frame based on said measured result previously measured by said strength measuring means;

    protection window size determining means for determining a size of a protection window based on the estimated S/N ratio estimated by said S/N ratio estimating means;

    timing estimating means for estimating an expected position of the received frame based on said measured result previously measured by said strength measuring means; and

    protection window adding means for adding protection window having the determined size determined by said protection window size determining means at each of front and rear ends of an expected timing frame to be contained in the received frame, based on the estimated expected position and the estimated S/N ratio of the received frame respectively estimated by said S/N ratio estimating means and said timing estimating means.

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