An Adaptive List-Output Viterbi Equalizer with Fast Compare-Select Operation

Kazuo TANADA  Hiroshi KUBO  Atsushi IWASE  Makoto MIYAKE  

Publication
IEICE TRANSACTIONS on Communications   Vol.E82-B   No.12   pp.2004-2011
Publication Date: 1999/12/25
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Multimedia Mobile Communication Systems)
Category: 
Keyword: 
wide-spread intersymbol interference,  adaptive equalizers,  Viterbi detection,  hardware implementation,  

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Summary: 
This paper proposes an adaptive list-output Viterbi equalizer (LVE) with fast compare-select operation, in order to achieve a good trade-off between bit error rate (BER) performance and processing speed. An LVE, which keeps several survivors for each state, has good BER performance in the presence of wide-spread intersymbol interference. However, the LVE suffers from large processing delay due to its sorting-based compare-select operation. The proposed adaptive LVE greatly reduces its processing delay, because it simplifies compare-select operation. In addition, computer simulation shows that the proposed LVE causes only slight BER performance degradation due to its simplification of compare-select operation. Thus, the proposed LVE achieves better BER performance than decision-feedback sequence estimation (DFSE) without an increase in processing delay.