CIR and BER Performance of STFBC in MIMO OFDM System

In multiple input multiple output (MIMO) orthogonal frequency division multiplexing (OFDM) system, inter carrier interference (ICI) which generates by frequency offset (FO) degrades the system performance. The objective of this research is to compensate integrated effect of FO the space time frequency block codes (STFBC) by employing two types of subcarrier mapping (adjacent and symmetric) with different ICI-Self Cancellation (ICI-SC) methods (data conversion and data conjugate) are proposed. Average power of desired (APD) signal, ICI and Carrier to Interference Ratio (CIR) are derived theoretically. CIR and Bit Error Rate (BER) performance of the proposed system are analyzed. As results, it can be shown that by choosing appropriate subcarrier mapping combining with ICI-SC methods, performance improvement can be achieved in the MIMO OFDM system which affected by FO.

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