Abstract

Quadriphase complex sequences based on unified complex Hadamard transform (UCHT) are orthogonal and easy to generate S. Rahardja et al. (2003). There are sixty-four sets in UCHT-based sequences. Some sets of UCHT sequences provide better autocorrelation properties than orthogonal Walsh-Hadamard (WH) sequences. In this paper, UCHT-based sequences are applied as spreading sequences in an asynchronous MC-DS-CDMA system. The bit-error rate (BER) performance of the underlying system with complex spreading sequences is investigated and simulation results show that the asynchronous MC-DS-CDMA system spread by UCHT sequences outperforms that spread by WH sequences in frequency selective fading channel

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