Performance of MIMO system with transmit antenna selection based on LLR

The antenna diversity based on log-likelihood ratio (LLR) is a new technology which is better than that based on signal-to-noise ratio (SNR) in performance. In this paper, we derive the expressions of transmit antenna selection schemes based on SLLR and BLLR over MIMO Nakagami channel. The average bit-error rate (BER) performance of M-ary on the correlated fading channel simulated by the Kronecker model and the Weichselberger model is studied. The results show that the BLLR scheme is optimum since it minimizes the BER of MIMO system. With the same total number of antennas, the system which possesses the higher diversity order exhibits better performance. Moreover, with the same diversity order, the BER performance is improved due to the higher number of receive antennas.