A novel hybrid ICI cancellation technique for OFDM optimization

Abstract

Orthogonal Frequency Division Multiplexing (OFDM), a most promising technique where multi-carrier modulation concept is implemented through splitting the signal into a number of signals, modulating each of these new signals to several orthogonal sub-carriers and combining the data received on the multiple channels at the receiver. Apart from delivering high spectrum efficiency, great channel robustness, immunity to impulse interferences, flexibility and easy equalization, OFDM is severely affected by undesirable effects of frequency offset errors (causes to generate inter carrier interface) due to Doppler shift in receiver frequency and Local oscillator frequency synchronization error. This paper describes some of the important ICI cancellation techniques, like Self Cancellation and Maximum Likelihood, and produces their performance comparative analysis with respect to BER and SNR. A new proposed technique is here by presented to further improve OFDM performance with varying Doppler shift error. The simulation results shows that proposed technique has significant improvements in the error performance and comparative analysis suggest that proposed technique has outperform legacy Self Cancellation and Maximum Likelihood ICI cancellation scheme with huge gain.