Bit error rate improvement for QPSK modulation technique in a MIMO rayleigh fading channel by maximum likelihood equalization

Multiple Input Multiple Output (MIMO) systems have recently emerged as one of the most promising technology in wireless communication systems that give tremendous advancement in achieving high data rates and improved system performance. In this paper, we discussed about the receiver structure called Maximum Likelihood (ML) Equalization and simulated this structure in a Rayleigh fading channel with QPSK modulation. Depending on bit error rates, we compared the performances of MIMO system for different combinations of transmit-receive structure. Simulation results showed that the BER can be improved by ML receiver for 2×4 MIMO Rayleigh fading channel than other lower order combinations.