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

概要

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Bit error rates (BER) for playback of (1, 7) code employed n 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 ω=0.5 for data consisting of 10^7 symbols. For a minimum bit length of 0.28μm, BER of 10^<-4> and less than 10^<-6> was obtained for SN ratios of 15.6dB and 17.7dB, respectively. And for a minimum bit length of 0.26μm, BER of 10^<-4> and less than 10^<-6> was obtained for SN ratios of 16.7dB and 18.8dB, respectively. These results demonstrate the feasibility of a minimum bit length of 0.26μm in current optical disc recorders.
2000-04-25