Transmission Characteristics of 4×4 MIMO System with OFDM Multiplexing and Markov Chain Monte Carlo Receiver
R Bhagya1, Pramodini D V2, A G Ananth3

1Bhagya. R, Assistant professor in Dept of Telecommunication, RVCE. Bangalore, Karnataka India.
2Pramodini D V, Assistant professor in Dept of Information Science and Engineering, PESSE, Bangalore, Karnataka, India.
3Dr. A G Ananth working as Professor in Telecommunication Department of R.V College of Engineering, Bangalore, India.
Manuscript received on October 08, 2011. | Revised Manuscript received on October 22, 2011. | Manuscript published on November 05, 2011. | PP: 233-237 | Volume-1 Issue-5, November 2011. | Retrieval Number: E0205101511/2011©BEIESP
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Abstract: A detailed analysis of the performance of 4×4 Multiple Input Multiple Output (MIMO) antenna system has been carried out using Orthogonal Frequency Division Multiplexing (OFDM) techniques. The transmission characteristics are determined for BPSK and 16-QAM digital modulation. Additive White Gaussian Noise (AWGN) has been used for the channel. On the receiver side, Markov Chain Monte Carlo (MCMC) receiver techniques have been employed for computing the BER performance. The simulation results show that, for BER of ~10-4 , the SNR achieved are significantly higher. The results indicate for BPSK modulation the SNR ~ 9 dB, and for 16-QAM modulation the SNR ~13 dB. The MIMO- OFDM multiplexing scheme show a overall improvement of ~ 4.0 dB for BER values of 10-4 between BPSK and 16-QAM modulation. A comparison of the performance of present MIMO-OFDM multiplexing system with MIMO-CDMA system and common MCMC receiver indicates that, the MIMO-OFDM Multiplexing exhibits a better BER performance for 16-QAM digital modulation. The simulations results are presented and discussed in the paper.
Keywords: Multiple Input Multiple Output (MIMO), Orthogonal Frequency Division Multiplexing (OFDM), Phase Shift Keying (PSK), Quadrature Amplitude modulation (QAM), Markov Chain Monte Carlo (MCMC) Bit Error Rate (BER), Signal to Noise Ratio (SNR), Code Division Multiple Access (CDMA).