Abstract
The bit error rate of a (1,7) code for a digital optical disk recorder when the code is regenerated by PRML combining partial response equalization and 3-level/2-level weighted 4-state Viterbi decoding is derived and compared by simulation with the ideal regenerated waveform (Gaussian waveform). It is found that the bit error is best when the weight w is 0.625 for 106 symbols of data. For a shortest bit length of 0.28 μm, the bit error rate (BER) is 10–4 at an SN ratio of 17.5 dB and zero error is obtained at 20 dB. Also, at the shortest bit length of 0.26 μm, the BER is 10–4 at an SN ratio of 19.5 dB and zero error is obtained at 22 dB. These results are 3 dB better than the case of 3-level 4-state Viterbi decoding (w = 1) and 7 dB better than 2-level 4-state Viterbi decoding (w = 0). Hence, practical realization of the shortest bit of 0.26 μm is found promising. © 1999 Scripta Technica, Electron Comm Jpn Pt 2, 83(1): 7–16, 2000
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