Title :
An Accurate Analytical Model for Overloaded DS-CDMA under Imperfect Synchronization
Author :
Jos, Sujit ; Kumar, Preetam ; Chakrabarti, Saswat
Author_Institution :
RF Group, C-DOT Bangalore, Bangalore, India
Abstract :
A DS-CDMA system is said to be Overloaded if the number of users supported is more than the spreading factor N. Overloading is an attractive candidate for next generation cellular telephony that calls for a higher user capacity than that supported by conventional DS-CDMA systems. This work derives an accurate analytical model for Overloaded DS-CDMA system under imperfect synchronization. The Model also takes care of the degradation in signal energy due to the loss in Autocorrelation value at the matched filter receiver. BER expressions for Individual users are also derived for uniformly distributed synchronization errors that happen to be the case in practical scenario. Monte-Carlo simulations verify the presented analysis.
Keywords :
Monte Carlo methods; cellular radio; code division multiple access; error statistics; spread spectrum communication; synchronisation; BER expressions; Monte-Carlo simulations; analytical model; autocorrelation value; distributed synchronization errors; imperfect synchronization; matched filter receiver; next generation cellular telephony; overloaded DS-CDMA system; signal energy degradation; AWGN; Analytical models; Autocorrelation; Binary phase shift keying; Bit error rate; Degradation; Interference; Matched filters; Multiaccess communication; Radio frequency;
Conference_Titel :
Vehicular Technology Conference (VTC 2010-Spring), 2010 IEEE 71st
Conference_Location :
Taipei
Print_ISBN :
978-1-4244-2518-1
Electronic_ISBN :
1550-2252
DOI :
10.1109/VETECS.2010.5493848
