Title :
Multicarrier CDMA with hybrid spreading in frequency impairment channels
Author :
Gemeay, E. ; Khedr, M. ; El-noubi, S. ; Nasr, M.
Author_Institution :
Dept. Commun. Eng., Tanta Univ., Tanta
Abstract :
In this paper the effect of carrier frequency offset on the multicarrier direct sequence CDMA system which employs both time and frequency (TF) domain spreading or hybrid spreading is evaluated and simulated. The MC DS-CDMA system achieves high spectrum efficiency by using time-frequency spreading mechanism. The probability of bit error rate (BER) of TF-domain spread MC DS-CDMA is derived using the standard Gaussian approximation (SGA) in additive white Gaussian noise (AWGN) channel with frequency offset impairments. Numerical evaluation of the analytical expression of BER reveals that a high capacity and BER performance improvement are achieved over the performance of multicarrier CDMA (MC-CDMA) system which spreads the signal in the frequency domain. Extensive simulations were also performed to illustrate the correctness of the analysis of the TF-domain spread MC DS-CDMA system.
Keywords :
AWGN channels; approximation theory; code division multiple access; error statistics; probability; spread spectrum communication; time-frequency analysis; AWGN channel; MC DS-CDMA system; additive white Gaussian noise channel; bit error rate probability; frequency impairment channel; multicarrier direct sequence CDMA system; spectrum efficiency; standard Gaussian approximation; time-frequency domain spreading; AWGN; Additive white noise; Bit error rate; Frequency domain analysis; Gaussian approximation; Multiaccess communication; Multicarrier code division multiple access; Performance analysis; Signal analysis; Time frequency analysis; Code-division-multiple access (CDMA); carrier frequency offset; frequency-domain spreading; multicarrier modulation; time-domain spreading;
Conference_Titel :
Computer Engineering & Systems, 2008. ICCES 2008. International Conference on
Conference_Location :
Cairo
Print_ISBN :
978-1-4244-2115-2
Electronic_ISBN :
978-1-4244-2116-9
DOI :
10.1109/ICCES.2008.4773002