Minimum Difference Self-Cancellation Technique for SCFDMA System

Abstract

The 3rd-Generation Partnership Project (3GPP) has represented single carrier frequency division multiple access (SC-FDMA) for Long Term Evolution (LTE) uplink access scheme, which combines single carrier modulation with frequency domain equalization. SC-FDMA suffers from Carrier Frequency Offset (CFO) problem, which disrupt the orthogonality between subcarriers and give rise to Inter-Carrier Interference (ICI), which occurs between a user’s subcarriers, and Multiple Access Interference (MAI) among users, which occurs between different users’ subcarriers. In this paper, a new compensation technique is proposed to mitigate the interference in the frequency domain. Self-Cancellation and Single User Detector (SUD) techniques are compared with the proposed technique. Simulation results show that the proposed Minimum Difference (MD) -Self-Cancellation technique is able to improve BER performance compared to the conventional Self-Cancellation and SUD techniques by about 1.6 dB and 3.8 dB respectively in the presence Additive white Gaussian noise (AWGN) at BER =10-4. Also, in Rayleigh fading channel, it is observed that the proposed technique provides a low degradation comparing to conventional Self-Cancellation and SUD techniques by about 0.9 dB and 2.3 dB, at BER =10-3, respectively. Furthermore, the proposed MD-Self-Cancellation technique provides a low degradation comparing to the other techniques at high-speed mobility.