Improved BDFE using a priori information for turbo equalization

Show simple item record Wu, Jingxian Leong, Sang-Yick Lee, Kah-Ping Xiao, Chengshan Olivier, Jan Corne 2009-02-03T12:18:57Z 2009-02-03T12:18:57Z 2008-01
dc.description.abstract Turbo equalization improves communication system performance by iteratively exchanging information between soft-input soft-output (SISO) equalizer and SISO channel decoder. The trellis-based maximum a posteriori robability (MAP) algorithm serves as the optimum SISO equalizer for turbo equalization. However, MAP algorithm is unsuitable for systems with large modulation constellation size and severe inter-symbol interference (ISI) due to its prohibitively high computational complexity. In this paper, an improved SISO block decision feedback equalizer (BDFE) is proposed for low complexity turbo equalization. Unlike other sub-optimum equalizers which perform symbol by symbol detection, the proposed equalizer generates the soft output for each data bit by collecting information from a sequence of samples as in MAP algorithm. The sequence based equalization is enabled by using not only soft a priori input from channel decoder, but also hard a priori information obtained from BDFE in previous iteration. The combination of soft a priori information and hard a priori information renders better performance with less iterations compared to other suboptimum algorithms. In addition, the computational complexity of the proposed algorithm is on the same order as conventional SISO BDFE algorithm, and is much lower compared to the trellis-based MAP algorithm. en_US
dc.identifier.citation Wu, J, Leong, S, Lee, K, Xiao, C & Olivier, JC 2008, ‘Improved BDFE using a priori information for turbo equalization’, IEEE Transactions on wireless communications, vol. 7, no. 1, pp. 1-8. [] en_US
dc.identifier.issn 1536-1276
dc.identifier.other 10.1109/TWC.2008.060463
dc.language.iso en en_US
dc.publisher Institute of Electrical and Electronics Engineers en_US
dc.rights Institute of Electrical and Electronics Engineers en_US
dc.subject Block decision feedback equalization en_US
dc.subject Iterative equalization en_US
dc.subject Sequence detection en_US
dc.subject Turbo equalization en_US
dc.subject.lcsh Algorithms
dc.subject.lcsh Equalizers (Electronics)
dc.title Improved BDFE using a priori information for turbo equalization en_US
dc.type Article en_US

Files in this item

This item appears in the following Collection(s)

Show simple item record