A Study on (1,7) Coded PRML Systems Using a Double Clock Weighted Viterbi Decoding for Optical Disc Recorder

摘要

Bit error rates (BER) for playback of (1,7) code employed in optical disc recording were simulated using an ideal (Gaussian) playback waveform, with playback being performed by PRML (Partial Response Maximum-Likelihood) combining a partial response equalizer and a double clock weighted Viterbi decoder. It was found that best BER occurs for Pr(2,3,3,2) +7/10 level Viterbi decoding at a weighted value of w=0.5 for data consisting of 10~7 symbols.