Performance Analysis of V-Blast MIMO System using Different Modulation Techniques: An Analytical Approach

Multiple Input Multiple Output (MIMO) systems have been comprehensively studied in context of wireless communication system, which promises the both increased capacity and link level reliability. In this paper we will analyze Vertical Bell Labs Layered Space Time (V-BLAST) system at high signal-to noise ratio (SNR) region using BPSK and QPSK modulation by using various decoding techniques. We will consider a point-to-point MIMO communications over an independent, identically distributed (i.i.d) Rayleigh flat fading channel with two transmitting antennas and four receiving antennas. We will analyze the zero-forcing (ZF), minimum mean square error (MMSE), zero-forcing + Ordered Serial Interference Cancellation (ZF+OSIC), minimum mean square error + Ordered Serial Interference Cancellation (MMSE+OSIC) and Maximum Likelihood (ML) decoding techniques with respect to their BER performances. V-BLAST system is compared with different modulation technique and system gets better result in BPSK modulation.