Transmission characteristics of 4x4 MIMO system with OFDM multiplexing and Markov Chain Monte Carlo Receiver

A detailed analysis of the performance of 4×4Multiple Input Multiple Output (MIMO) antenna system hasbeen carried out using Orthogonal Frequency DivisionMultiplexing (OFDM) techniques. The transmissioncharacteristics are determined for BPSK and 16-QAM digitalmodulation. Additive White Gaussian Noise (AWGN) has beenused for the channel. On the receiver side, Markov Chain MonteCarlo (MCMC) receiver techniques have been employed forcomputing the BER performance. The simulation results showthat, for BER of ~10-4, the SNR achieved are significantlyhigher. The results indicate for BPSK modulation the SNR ~ 9dB, and for 16-QAM modulation the SNR ~13 dB. The MIMOOFDMmultiplexing scheme show a overall improvement of ~4.0 dB for BER values of 10-4 between BPSK and 16-QAMmodulation. A comparison of the performance of presentMIMO-OFDM multiplexing system with MIMO-CDMA systemand common MCMC receiver indicates that, the MIMO-OFDMMultiplexing exhibits a better BER performance for 16-QAMdigital modulation. The simulations results are presented anddiscussed in the paper.