| 摘要 |
A reception-synchronization protecting device comprises strength measuring means, an S/N ratio estimating circuit, a protection window size determining circuit, a timing estimating circuit, and a protection window adding circuit. The strength measuring means is used for measuring a signal strength of a CCS signal contained in a received frame and producing a measured result. The S/N ratio estimating circuit is used for estimating an S/N (a Signal-to-Noise) ratio of the received frame with basing on the measured result previously measured by the signal strength measuring circuit. The protection window size determining circuit is used for determining a size of a protection window with basing on the estimated S/N ratio estimated by the S/N ratio estimating circuit. The timing estimating circuit is used for estimating an expected position of the received frame with basing on the measured result previously measured by the signal strength measuring circuit. The protection window adding circuit is used for adding protection window having the determined size determined by the protection window size determining circuit at each of front and rear ends of an expected timing frame to be contained in the received frame, with basing on the estimated position and the estimated S/N ratio of the received frame respectively estimated by the S/N ratio estimating circuit and the timing estimating circuit.
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