Title :
Accurate BER Analysis of Asynchronous DS-CDMA Systems in Ricean Channels
Author :
Liu, Xiang ; Hanzo, Lajos
Author_Institution :
Sch. of Electron. & Comput. Sci., Southampton Univ., Southampton
Abstract :
The accurate Bit Error Rate (BER) calculation of an asynchronous Ricean-faded DS-CDMA system using random spreading sequences and BPSK modulation is studied in this paper. A new closed-form expression is derived for the conditional characteristic function of the cochannel interference. Furthermore, a new BER expression involving only a single integration is derived invoking the characteristic function approach and hypergeometric functions of two variables. The accuracy of our BER expression is confirmed by our simulation results for various spreading sequence lengths and various Ricean K-factors. By contrast, the standard Gaussian approximation (SGA) overestimates the BER of Rayleigh fading channels, when there is no line-of-sight (LOS) component and it under-estimates the BER, when the LOS component becomes stronger.
Keywords :
Gaussian channels; Rician channels; approximation theory; cochannel interference; code division multiple access; error statistics; phase shift keying; sequences; BER analysis; BPSK modulation; LOS component; Rayleigh fading channel; Ricean cochannel interference; asynchronous DS-CDMA system; bit error rate; closed-form expression; conditional characteristic function; hypergeometric function; random spreading sequence; standard Gaussian approximation; AWGN; Binary phase shift keying; Bit error rate; Closed-form solution; Computer science; Fading; Gaussian approximation; Interchannel interference; Multiaccess communication; Multiple access interference;
Conference_Titel :
Vehicular Technology Conference, 2006. VTC-2006 Fall. 2006 IEEE 64th
Conference_Location :
Montreal, Que.
Print_ISBN :
1-4244-0062-7
Electronic_ISBN :
1-4244-0063-5
DOI :
10.1109/VTCF.2006.437
