Performance of multicarrier CDMA with dual spreading in Nakagami-m frequency offset fading channels

Authors:
E. Gemeay;M. Khedr;S. El-noubi;M. Nasr
Affiliations:
Dept. Communications Engineering, Tanta University, Egypt;Dept. Electronics and Communication, Arab Academy for Science and Tech, Egypt;Dept. EE, Alexandria University;Dept. Communications Engineering, Tanta University, Egypt
Venue:
ICACT'10 Proceedings of the 12th international conference on Advanced communication technology
Year:
2010

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Abstract

In general, Multicarrier systems are very sensitive to carrier frequency offset (CFO) which generates intercarrier interference (ICI) resulting in performance degradation. However, by using frequency diversity in multicarrier DS-CDMA system, the effect of ICI caused by CFO can be significantly reduced. This can be achieved in Time-Frequency (TF) domain spreading MC DS-CDMA system which employs both time and frequency (TF) domain spreading or hybrid spreading. In this paper, the performance of TF-domain spread MC-DS-CDMA system over Nakagami-m fading channels is evaluated and investigated with varying CFO, number of users, number of subcarriers, and Signal-To-Noise-Ratio (SNR). The probability of bit error rate (BER) of TF-domain spread MC-DS-CDMA is derived using the standard Gaussian Approximation (SGA) approach for different values of m parameter. Numerical evaluation of the analytical expression of BER reveals that a high capacity and BER performance improvement are achieved for TF-domain spread MC-DS-CDMA system over the performance of mnlticarrier CDMA (MC-CDMA) system which spreads the signal in the frequency domain only. The simulation results show excellent agreement with the analysis.