A Novel ICI Self-cancellation Scheme for Improving the Performance of OFDM System

Abstract

Orthogonal frequency division multiplexing (OFDM) is a promising technique for fourth generation (4G) broadband wireless communication systems. However its performance is degrade due to Doppler frequency drift or frequency drift between transmitter and receiver oscillator which causes frequency offset. This leads to a loss in the orthogonality between sub-carriers and results in inter-carrier-interference (ICI). In this paper we proposed a novel ICI self-cancellation scheme for ICI mitigation in OFDM system and compared it with the standard OFDM system and conventional self-cancellation scheme in terms of carrier-to-interference ratio (CIR) and bit-error rate. This scheme works in two very simple steps. At the transmitter side, one data symbol is modulated onto four sub-carriers with appropriate weighting coefficients. At the receiver side by linearly combining the received signals on these sub-carriers leads to a sufficient reduction in ICI. The simulation result shows that the proposed scheme outperforms the existing method. © Springer International Publishing Switzerland 2014.