Analysis of Equalization Techniques for MIMO Systems in wireless communication

Abstract

Adetail analysis of the performance of 2X2 Multiple Input Multiple Output (MIMO) antenna system with STBC multiplexing and Alamouti coding and BPSK modulation for high data rate transmission has been carried out assuming flat fading Rayleigh channel. Combining different linear and non-linear detection techniques, Bit Error Rate (BER) performance have been studied in comparison to the optimally equalized 1X2 antenna Maximal Ratio Combining (MRC) techniques of receive diversity. The combination of linear techniques such as Zero Force (ZF) equalization methods and non-linear techniques such as Successive Interference Cancellation (SIC) shows that for BER ~10-3 there is an improvement of SNR by ~2.2 dB compared to ZF case. The combination of ZF, SIC and non-linear techniques such as optimal ordering showed further improvement in the SNR ~2dB. The combination of linear techniques such as Minimum Mean Square Equalization (MMSE) methods with SIC and optimal ordering indicates that for BER by 10-3 significant improvement in SNR ~ 5 dB over ZF case.