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Manchester the symbol synchronous manner for the amplitude-modulated signal to be encoded, program and record media
Manchester the symbol synchronous manner for the amplitude-modulated signal to be encoded, program and record media
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机译:曼彻斯特符号同步方式,用于对调幅信号进行编码,编程和记录
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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
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