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A Proposal of Simplified Viterbi Equalizer Applied to FWA Systems Employing 64QAM Signals Hiroshi YOSHIOKA Yushi SHIRATO Kazuji WATANABE Publication IEICE TRANSACTIONS on Communications Vol.E89-B No.3 pp.784-790 Publication Date: 2006/03/01 Online ISSN: 1745-1345 DOI: 10.1093/ietcom/e89-b.3.784 Print ISSN: 0916-8516 Type of Manuscript: PAPER Category: Wireless Communication Technologies Keyword: 64QAM, FWA, Viterbi equalizer, Full Text: PDF(1.4MB)>>
Summary: We propose a novel simplified Viterbi equalizer for high symbol rate FWA (Fixed Wireless Access) systems carrying 64QAM signals. Reduced complexity and improved performance are achieved adopting two approaches. The first one is reducing the number of survival paths, taking advantage of the large D/U common in LOS (line of sight) communications. The second one is using a multi-stage process to generate desired signal replicas based on their likelihoods. Computer simulations confirm that the proposed replica generation method offers a performance improvement of about 1 dB and the proposed Viterbi equalizer offers reduced complexity with no performance penalty compared to full Viterbi equalizer. | |||||
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