SYMBOL SYNCHRONIZATION METHOD FOR MANCHESTER-ENCODED AMPLITUDE MODULATION SIGNAL, PROGRAM, AND RECORDING MEDIUM

摘要

PROBLEM TO BE SOLVED: To provide a symbol synchronization method applied to a Manchester-encoded ASK (Amplitude Shift Keying) modulation signal of an NRZ (Non Return to Zero) encoding sequence or an RZ (Return to Zero) encoding sequence.;SOLUTION: A received data sequence comprising ASK modulation signals is sampled at 2×n+2 (n is a plurality of number of oversampling times) sets of timing positions and the sampled sequence is recorded in a data recording section 50. A correlation value S1 is obtained from 2×n sets of data from a first timing position in the data sequence, a correlation value S2 is obtained from 2×n sets of data from a second timing position in the data sequence, and a correlation value S3 is obtained from 2×n sets of data from a third timing position in the data sequence, respectively in the data sequence comprising the ASK modulation signals recorded in the data recording section 50. A timing position just after 2×n sets of data in the data sequence having a maximum correlation value Sm among the correlation values S1, S2 and S3 is selected for a timing position of symbol start. The synchronization of a succeeding symbol can be taken by obtaining correlation values in a basic timing and timings before and after the basic timing.;COPYRIGHT: (C)2005,JPO&NCIPI