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In this paper, a novel OFDM-CDMA system with joint time-frequency spreading methods is proposed. The average bit error probability of the proposed system using maximum-ratio combining (MRC) is derived for a frequency-selective fading channel and that of conventional MC-CDMA is also presented for comparison. Numerical analysis and simulation results indicate that the proposed system outperforms MC-CDMA system. Index Terms-CDMA, maximum ratio combining, multiple access, OFDM.doi:10.1109/tbc.2004.839609 fatcat:r2zlveu645hg5hoqx4qtpch2xu