Performance of polyphase spreading sequences with optimized cross-correlation properties [CDMA systems]

The performance of a code division multiple access (CDMA) system depends on the correlation properties of the employed spreading sequences. In this paper, we investigate the performance of polyphase spreading sequences in an asynchronous direct sequence (DS) CDMA system. Especially, the equivalent odd and even correlation (EOE) sequences and the Oppermann sequences are examined. Their performance in terms of symbol error rate (SER) on additive white Gaussian noise (AWGN) channels and multiplicative Rayleigh fading channels are compared. Simulation results show that the Oppermann sequences with optimized cross-correlation characteristics outperform the EOE sequences on an AWGN channel and perform slightly better on a Rayleigh fading channel.