Performance Improvement of STBC OFDM MC-CDMA with Phase Matrix in Different Channel Models

Abstract

In this paper, an improvement of space-time, block-coded (STBC) multicarrier code-division multiple-access (MC-CDMA) system using phase matrix in multipath fading channel is proposed, and the performance of the system is analyzed. The bit error rates BER numerical results show that the better performance of the STBC-MC-CDMA system with phase matrix can be achieved when comparing with system without using phase matrix. As a result, it can be seen from the proposed technique that a high performance improvement was obtained over the conventional MC-CDMA, where the Bit Error Rate (BER) is mainly reduced under different channel characteristics for frequency selective fading and the AWGN channel.

Keywords: STBC, MC-CDMA, OFDM, IFFT, FFT, Phase matrix.