Title :
Performance analysis for DS-CDMA systems with UCHT signature sequences over fading channels
Author :
Gu, Zhenghui ; Xie, Shoulie ; Rahardja, Susanto
Author_Institution :
Inst. for Infocomm Res., Singapore, Singapore
Abstract :
The bit-error-rate (BER) performance for a direct-sequence code-division multiple access (DS-CDMA) system with complex signature sequences is investigated in fading channels. Due to the availability of potentially large sets of complex sequences with good correlation characteristics, the interest of using complex spreading sequences in a CDMA system has increased dramatically. The average BER for asynchronous DS-CDMA with general complex signature sequences is derived based on the Gaussian approximation method. We investigate the recently introduced orthogonal unified complex Hadamard transform (UCHT) sequences. Numerical examples show that BER performance of UCHT sequences is better than that of Gold sequences for the system under consideration.
Keywords :
Hadamard transforms; approximation theory; code division multiple access; error statistics; fading channels; sequences; spread spectrum communication; BER; Gaussian approximation method; Gold sequences; asynchronous DS-CDMA systems; bit-error-rate; complex signature sequences; complex spreading sequences; direct-sequence code-division multiple access system; fading channels; unified complex Hadamard transform signature sequences; AWGN channels; Additive white noise; Binary sequences; Bit error rate; Fading; Gaussian approximation; Gold; Multiaccess communication; Multiple access interference; Performance analysis;
Conference_Titel :
Vehicular Technology Conference, 2004. VTC 2004-Spring. 2004 IEEE 59th
Print_ISBN :
0-7803-8255-2
DOI :
10.1109/VETECS.2004.1390486
