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Title: Low complexity turbo equalization for coded intersymbol interference channels
Keywords: EXtrinsic Information Transfer (EXIT) chart, heuristic search methods, intersymbol interference, local search, low complexity, turbo equalization
Issue Date: 4-Jul-2008
Citation: FOO SIANG MENG (2008-07-04). Low complexity turbo equalization for coded intersymbol interference channels. ScholarBank@NUS Repository.
Abstract: Practical implementation of a turbo equalizer requires low complexity alternatives to the Bahl-Cocke-Jelinek-Raviv (BCJR) algorithm while yet maintains comparable BER performances. In this thesis, we proposed a heuristic-based equalizer based on local search (LS) algorithm as utilized in a turbo setup. Through simulations, the BER performances of our proposed heuristic-based LS turbo equalizer is found to suffer negligible degradation while yet alleviating the complexity of the trellis-based BCJR turbo equalizer significantly. A comparison in terms of BER performances and computational complexity is also carried out with the filter-based minimum mean-square error (MMSE) turbo equalizer. Various low complexity variants from the class of trellis-based and filter-based turbo equalizer are also considered. Analytical investigation on our proposed heuristic-based LS turbo equalizer is then carried out through the use of EXtrinsic Information Transfer (EXIT) chart. Through the EXIT chart, numerous interesting insights on our proposed LS turbo equalizer are drawn.
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