Performance Comparison of Signal Detection Methods in Viterbi Decoding for NRZL Recording Code

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  • ＮＲＺＬ記録符号に対するビタビ復号法の信号検出方式に関する性能比較
  • NRZL キロク フゴウ ニ タイスル ビタビ フクゴウホウ ノ シンゴウ ケ

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Abstract

An analysis is presented on the performance of Viterbi decoding for NRZL recording code where noise samples at decoder input are correlated.<BR>Bit error probabilities are obtained for three detection methods : amplitude detection, integrated detection and partial response detection, and a comparison of performance for these detection methods is made in terms of the linear density and required SNR at reading point for a given error probability. The performance of Viterbi decoding is also compared with that of bit-by-bit decoding.<BR>The results show that in high-density recording the partial response detection method with Viterbi decoding gives the best performance among these detection methods with Viterbi or bit-by-bit decoding.

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