PERFORMANCE EVALUATION OF AN STBC ENCODED MIMO-OFDM SYSTEM UNDER IMPLEMENTATION OF SVD BASED CHANNEL ESTIMATION TECHNIQUE

Abstract

This paper incorporates a comprehensive BER simulation study undertaken on the effectiveness of a space time block encoded multiple-input multiple- output orthogonal frequency division multiplexing (MIMO-OFDM) communication system under implementation of ½-rated convolutionally encoding scheme. The MIMO-OFDM system under present study has incorporated four digital modulations (BPSK, DPSK,QPSK and QAM) over AWGN and Rayleigh fading channel for two transmit and two receive antennas. It implements Singular value decomposition (SVD) based channel equalization algorithm. Computer simulation tests have been conducted with synthetically generated binary data and the results on Bit error rate (BER) demonstrate that the MIMO-OFDM system with QAM
modulation technique is highly effective to combat inherent interferences under Rayleigh fading and AWGN channels. It is anticipated from the simulation study that the retrieving performance of the MIMO- OFDM communication system degrades with the lowering of the signal to noise ratio (SNR).