Inter Carrier Interference Analysis of SCFDMA System using Frequency Domain Equalization

Single Carrier Frequency Division Multiple Access (SCFDMA) system performs better than multicarrier transmission systems due to its inherent single carrier structure. It is a strong candidate for uplink communication due to its lower peak to average power ratio (PAPR) but it is high sensitive to carrier frequency offset. However the problem of intercarrier interference (ICI) in SCFDMA system is not addressed. In this paper conjugate cancellation method is used to reduce the effect of frequency offset in SCFDMA system. Bit error rate of OFDMA and SCFDMA system is compared in different multipath channels using zero forcing equalizer (ZFE) and Minimum mean square error (MMSE) equalizers. Simulation results shows that ZFE performs better for additive white gaussian noise (AWGN) and pedestrian channels but its performance gets degraded in vehicular channels. MMSE equalizer performs better than zero forcing equalizer up to 0.2 normalized frequency offset in vehicular channels.