BLAST System: Different Decoders with Different Antennas

Abstract

Wireless communication technology has shown that the application of multiple antennas at both transmitter and receiver sides improve the possibility of high data rates through multiplexing or to improve performance through diversity compared to single antenna systems. In this article, the BER performance of MMSE and Maximum Likelihood (ML) -Vertical Bells Lab Layered Space Time Architecture (V-BLAST) with different modulation techniques such as BPSK and QPSK, in Rayleigh flat fading channel has been considered. Further, the comparison of these modulation techniques with different multiple antenna configurations in Rayleigh channel is carried out. It has been concluded that both the decoders perform better using BPSK modulation scheme as compare to QPSK modulation scheme and we obtain more optimal results for 1× 4 antennas for both MMSE V-BLAST and ML-V-BLAST system in Rayleigh channel. While comparing the ML and MMSE-VBLAST for 2 X 2 antenna configurations, the better results has been obtained for ML-VBLAST System as compare to MMSE V-BLAST System in Rayleigh Channel.