SPREAD SPECTRUM COMMUNICATION SYNCHRONIZING SYSTEM

摘要

PURPOSE:To shorten the time up synchronization by detecting a peak with N pieces of matching filters and selecting the maximum of added values. CONSTITUTION:An inverse spread arithmetic part 2 delays an input signal with a clock at the velocity of N multiple (N is a natural number of =2) of the inverse of a spread rate while using a delay line 1, a weighting coefficient for inverse spread is multiplied for every N pieces of taps of the delay line 1, and the outputs of the same order in the N pieces of taps are synthesized. Thus, the N pieces of matching filters for performing the arithmetic of inverse spread are formed. On the other hand, N pieces of added value arithmetic parts 4 are provided, the outputs of the respective matching filters are delayed by a delay line 3, and peak points at the outputs of respective taps in the delay line 3 are added and outputted. Further, the maximum value of the arithmetic part 4 is selected by a maximum value selection part 5, and this maximum value is supplied to the delay lines 1 and 3 while controlling clock timing at a clock timing control part 6 so as to increase the value.