Abstract
AbstractIn this paper, a frame synchronization characteristic and its improvement in degraded bit‐error‐rate conditions (BER = 10−2 ± 10−1) and in the presence of burst errors, are discussed. For the pattern matching type of frame synchronization, an algorithm of two‐frame‐search‐and‐check, in conjunction with the conventional method of allowable bit errors in the detection of sync word, is studied. By regarding the number of allowable errors as design freedom, this paper clarifies the optimum design condition in two‐frame‐search‐and‐check algorithm and its characteristic improvement effect, in comparison with the conventional algorithm. By using this method, the number of backward protection stages is increased equivalently, the holding time when BER is degraded is improved and the allowable burst length is increased by 102 ‐ 105 times. Also, in the reframing characteristic, since the holding of false synchronization is decreased, the reframing time is shortened and the design freedom for the number of allowable errors is extended.
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