Low Complexity Estimator for Downlink MC-CDMA System

Abstract

Multi-carrier code division multiple access (MC-CDMA) is a strong candidate for downlink of future mobile communication to obtain high data rates. Nevertheless, during transmission over fading channel, performance of MC-CDMA systems are highly degraded due to presence of multiple access interference(MAI).Therefore channel estimation play an important role in overcoming MAI and characterising the channel to correct the received signal. A low complexity estimator for downlink MC-CDMA is proposed and simulated by MATLAB over a frequency selective fading channel. Comparing with conventional MMSE this algorithm has advantages of low computational complexity. The simulation results demonstrate that MC-CDMA with proposed channel estimator outperforms the OFDM in the practical case of Rayleigh fading environment.