Performance Comparison of Spreading Sequences in Synchronous MC-CDMA Systems
Zhenghui Gu, S. Xie, Susanto Rahardja, E.T. Sze, Yu Xin · 2006
The bit error rate (BER) performance of various spreading sequences in a synchronous multicarrier code-division multiple access (MC-CDMA) system is compared by numerical simulations in this paper. The underlying subcarriers are correlated. Gold, orthogonal Gold, 4-phase family A, Walsh-Hadamard (WH) and new orthogonal unified complex Hadamard transform (UCHT) sequences are investigated here. Simulation results show that both orthogonal WH and UCHT sequences give the best BER performance among various spreading sequences. The disparity in performance between the various spreading sequences can be explained by the property of the zero-delay cross-correlation in frequency domain