Performance analysis of MC-DS-CDMA in the presence of carrier frequency offset and timing jitter over Rayleigh Fading Channels

Abstract

In this paper an analytical approach is presented to determine the impact of frequency offset, timing jitter and additive white Gaussian noise (AWGN) on the bit error rate (BER) performance of a multi-carrier direct-sequence code division multiple access (MC-DS-CDMA) system over a Rayleigh Fading Channel. The analysis developed the pdf (probability density function) at the receiver considering combined influence of fading, timing jitter and Doppler frequency offset etc with maximal ratio combining (MRC) scheme. The expression for the conditional BER conditioned on a given timing error and fading is derived and the average BER is evaluated in the presence of Multiple Access Interference (MAI) and Inter-Carrier Interference (ICI). The performance results are evaluated numerically in terms of SINR and BER considering system parameters like number of users, number of sub-carriers. The result shows significant deterioration in SINR and BER performance due to fading along with the changes in parameters.