Performance Analysis of MIMO-OFDM System using MMSE Receiver

Orthogonal Frequency Division Multiplexing (OFDM) technique has been proposed as a standard for the next generation wireless communication system. Next generation wireless communication technologies require multimedia service such as internet services, audio, video and mainly high data rate with high mobility. OFDM fulfills these requirements. It provides high data rates and high spectral efficiency. Also high data rate can be achieved by the Multiple Input and Multiple Output (MIMO) technique. MIMO technique increases the diversity gain. This improves the Bit Error Rate (BER) performance of the system. These two technique bring together resulting MIMO-OFDM system to get the benefit of both the techniques. In this paper performance of MIMO-OFDM system is analyzed by using Minimum Mean Square Error (MMSE) technique. Simulation results show that improved BER is obtained with MIMO system than the without MIMO system. In addition BER performance is also investigated for different number of transmitting and receiving antennas and different modulation techniques.