Reduced Complexity MLSD Equalizers Based on Bidirectional DFEs

Jangwoo PARK  Youngsun HA  Wonzoo CHUNG  

Publication
IEICE TRANSACTIONS on Communications   Vol.E95-B   No.11   pp.3432-3436
Publication Date: 2012/11/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E95.B.3432
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Fundamental Theories for Communications
Keyword: 
Equalizer,  time-reversal diversity,  MLSD equalizer,  bidirectional DFE,  bidirectional arbitrated DFE (BAD),  

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Summary: 
We propose a reduced complexity maximum likelihood sequence detection (MLSD) equalizer for wireless communications using bidirectional decision feedback equalizers (DFEs). We apply reduced-length two-level estimates produced by a bidirectional DFE. Therefore, the computationally expensive MLSD algorithm is applied sparingly for two-level signals with the effective channel length shorter than the original channel, regardless of the original constellation size of the symbols. Simulation results show that the proposed algorithm outperforms existing combination schemes based on bidirectional DFEs, especially for large constellations.