Channel Equalization for MIMO LTE System in Multi-path Fading Channels

The Long Term Evolution (3GPP-LTE) combines the Multi-input multi-output (MIMO) antenna and the Orthogonal Frequency Division Multiple Access (OFDMA) techniques to accomplish high speed data transmission. Comparisons of zero forcing (ZF), minimum mean square error (MMSE) and sphere decoding (SD) equalization methods with Turbo code are given under time-varying multi-path fading channel with Doppler frequency shift. The simulation shows that the MMSE and SD equalizer are more robust than the ZF equalizer as the Doppler frequency shift increases.