Open AccessLow‐complexity soft‐interference cancellation turbo equalisation for multi‐input–multi‐output systems with multilevel modulations
Author(s) -
Wu Jingxian,
Wang Longbao,
Xiao Chengshan
Publication year - 2015
Publication title -
iet communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.355
H-Index - 62
eISSN - 1751-8636
pISSN - 1751-8628
DOI - 10.1049/iet-com.2014.0396
Subject(s) - equaliser , computer science , feed forward , intersymbol interference , exit chart , control theory (sociology) , equalization (audio) , root raised cosine filter , filter (signal processing) , single antenna interference cancellation , turbo , matched filter , raised cosine filter , filter design , algorithm , electronic engineering , decoding methods , artificial intelligence , engineering , control (management) , control engineering , automotive engineering , concatenated error correction code , computer vision , block code
This study presents a low‐complexity soft‐interference cancellation equaliser (SICE) for the turbo detection of multiple‐input–multiple‐output systems operating in time dispersive channels. The SICE contains three time‐invariant linear filters: a feedforward filter, a causal feedback filter and an anti‐causal feedback filter. The feedforward filter is designed to suppress the intersymbol interference because of channel time dispersion and the multiplexing interference from multiple transmit antennas. The causal (or anti‐causal) feedback filter is developed to remove the residual interference caused by the symbols transmitted before (or after) the symbol under detection. The filters are designed by analysing the statistical properties of soft decisions. The performance of the proposed SICE is verified through both extrinsic information transfer (EXIT) chart analysis and computer simulations. The EXIT chart analysis shows that, because of the inclusion of the anti‐causal soft decision, the SICE performance approaches the ideal matched filter bound as the iteration progresses. Consequently, the proposed SICE achieves significant performance gains over conventional equalisers.