Author : Deepak Kedia and Ekta Charaya

MIMO-OFDM-CDMA system has been identified as a key technology to support high data rates in current and future wireless systems. MMSE receiver plays an important role in the performance evaluation of MIMO-OFDM-CDMA system. In this paper, we propose a detailed Signal-to-Interference Noise Ratio (SINR) analysis for space-time-frequency spread MIMO-OFDM-CDMA system using MMSE receiver. The accurate expressions for SINR have been derived for MMSE receiver. Further, the performance of such 4×4 MIMO system has also been evaluated and compared with zero forcing (ZF) receiver through simulation. The simulation results of the MIMO-OFDM-CDMA system are in line with the results obtained through mathematical analysis and MMSE receiver performs better than ZF receiver.

Keywords: Code Division Multiple Access (CDMA), Minimum Mean Square Error (MMSE) Receiver, Multiple Access Interference (MAI), Multiple-Input Multiple-Output (MIMO), Orthogonal Frequency Division Multiplexing (OFDM), Space-Time-Frequency (STF) Spreading, Signal to Interference Noise Ratio (SINR), Zero Forcing (ZF) Receiver

Article published in International Journal of Current Engineering and Technology, Vol.5, No.5 (Oct-2015)