Wireless communication channels for high-speed train (HST) systems are nonstationary and time-varying. A joint algorithm of inter-carrier interference (ICI) selfcancellation and zero forcing (ZF) equalization is proposed for multiple-input multipleoutput orthogonal frequency division multiplexing (MIMO-OFDM) systems used in the HST environment. At the receiver, cyclic prefix (CP) and linear weight average, and combing the subsequences extracted from each OFDM symbol are used to achieve ICI selfcancellation. The new OFDM symbol with ICI reduced is equalized by ZF equalization. The transmitted signal is then obtained by hard decision. Simulation results show that ICI can be effectively reduced by using CP, and the carrier-to-interference ratio (CIR) is raised. Besides, the proposed algorithm outperforms the ZF equalization method in terms of bit error rate (BER), and therefore ensures better quality of communications.
WANG Jun-hua, JIAO Wu-chen, FANG Yong
. Inter-carrier interference self-cancellation for MIMO-OFDMsystems in high-speed train environment[J]. Journal of Shanghai University, 2015
, 21(5)
: 536
-546
.
DOI: 10.3969/j.issn.1007-2861.2014.05.016
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