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List Viterbi Equalizers with Two Kinds of Metric Criteria
Hiroshi KUBO Makoto MIYAKE
Publication
IEICE TRANSACTIONS on Communications
Vol.E85-B
No.2
pp.487-494 Publication Date: 2002/02/01 Online ISSN:
DOI: Print ISSN: 0916-8516 Type of Manuscript: PAPER Category: Wireless Communication Technology Keyword: adaptive equalizer, Viterbi detection, mobile communication, broadband communication,
Full Text: PDF(716.9KB)>>
Summary:
This paper proposes list Viterbi equalizers (LVEs) that use two kinds of metric criteria for wide-spread time-dispersive channels to achieve a good trade-off between complexity and bit error rate (BER) performance. For Viterbi equalization employing a state-reduction algorithm, the modified metric criterion proposed by Ungerboeck is not always equivalent to the squared Euclidean distance metric criterion. This paper proposes the following two schemes for the LVE: (1) to combine two kinds of metric criteria like combining diversity; (2) to select the metric criterion like selection diversity according to the channel impulse response. Finally, computer simulation shows that the proposed schemes improve BER performance on wide-spread frequency selective fading channels, even if the proposed schemes have smaller complexity than the conventional one.
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