Title :
Analysis of Uplink Quasi-Synchronous CDMA System Using Orthogonal Polyphase Sequences
Author_Institution :
Univ. Coll. of Boras, Boras
Abstract :
The bit error rate (BER) performance for uplink quasi-synchronous code division multiple access system using different sets of orthogonal polyphase sequences is analyzed in this paper. The BER performance is evaluated in AWGN and flat Rayleigh fading channels. Correlation functions of some sequence sets are also compared. It is shown that LS-UCHT sequences have better autocorrelation properties as compared to unified complex Hadamard transform (UCHT) and modified UCHT sequences. Moreover, first 16 sequences of each set are compared and it is observed that LS-UCHT sequences having interference free window exhibit better BER performance for many sequences as compared to other sequence sets, for the system under consideration.
Keywords :
AWGN channels; Hadamard transforms; Rayleigh channels; code division multiple access; correlation methods; error statistics; AWGN; CDMA; LS-UCHT; additive white Gussian channel; bit error rate; code division multiple access; correlation functions; flat Rayleigh fading channels; loosely synchronized-UCHT; orthogonal polyphase sequences; unified complex Hadamard transform; uplink quasi-synchronous CDMA system; AWGN; Autocorrelation; Bit error rate; Delay; Educational institutions; Fading; Multiaccess communication; Multiple access interference; Performance analysis; Quadrature phase shift keying; Bit error rate (BER); interference free window (IFW); loosely synchronized codes (LS-codes); loosely synchronized-UCHT (LS-UCHT); modified UCHT; multiple access interference (MAI); signal-to-noise ratio (SNR); unified complex Hadamard transform (UCHT); zero correlation zone (ZCZ);
Conference_Titel :
Wireless and Optical Communications Networks, 2007. WOCN '07. IFIP International Conference on
Conference_Location :
Singapore
Print_ISBN :
1-4244-1005-3
Electronic_ISBN :
1-4244-1005-3
DOI :
10.1109/WOCN.2007.4284199
