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Soft-decision multistage decoding of multilevel-coded quaternary partial-response signals

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1 Author(s)
S. Olcer ; IBM Res. Div., Ruschlikon, Switzerland

This paper deals with multilevel coding and concatenated soft-decision multistage decoding for quaternary partial-response class-IV (PRIV) systems. Time-interleaved multilevel-coded quaternary symbols are transmitted with precoding over the PRIV channel. In the receiver, an inner decoder computes approximate log-likelihood ratios for the less significant bits of the quaternary symbols input to the precoded PRIV channel by a new reduced two-state soft-output Viterbi decoding algorithm. An outer multistage decoder employs the obtained log-likelihood ratios which, with sufficient interleaving, represent appropriate metrics for soft-decision decoding. Real coding gains over uncoded transmission with maximum-likelihood sequence decoding are determined by simulation. Results are presented for various multilevel codes that employ a single level of convolutional or Reed-Muller block coding. The scheme considered here exhibits low decoding complexity and allows for high-rate codes that achieve real coding gains of 3 to 4 dB

Published in:

Communications, 1994. ICC '94, SUPERCOMM/ICC '94, Conference Record, 'Serving Humanity Through Communications.' IEEE International Conference on

Date of Conference:

1-5 May 1994