Analytical approach for performance evaluation of MC - DS - CDMA system with fading and carrier frequency offset

Abstract

The performance analysis is carried out for a multi-carrier direct sequence (DS) CDMA wireless communication system over a Rayleigh Fading Channel. Performance analysis includes the effect of Multiple Access Interference (MAI), Inter-Carrier Interference (ICI) and the effect of Carrier Frequency Offset (CFO) due to carrier frequency synchronization. The expression of the Carrier to Interference plus Noise Ratio (SINR) is derived for a MC-DS-CDMA system considering the above system limitations. The analysis is also extended to MC-DS-CDMA system with Rake Receiver. The comparison for the Bit Error Rate (BER) for the above case is derived. The performance results are evaluated numerically in terms of SINR and BER considering several system parameters like number of users, processing gain, number of subcarriers and number of rake fingers with and without CFO. The result shows that there are significant deterioration in SINR and BER performance due to fading and CFO. For a given performance level, optimum system design parameters are determined from the analytical results.