ICI analysis for FRFT-OFDM systems in doubly selective fading channels

Frequency offset affects the performance of orthogonal frequency division multiplexing system. The FRFT based OFDM is considered in this article to minimize this affect. The expressions of signal to interference ratio (SIR) due to inter carrier interference (ICI) has been derived for frequency selective fading channel and doubly selective fading channels (Time frequency selective fading channels) for FRFT based OFDM system. The simulation analysis validate that FRFT based OFDM systems has superior SIR performances by choosing the optimal fractional factor than the standard OFDM system, for a large carrier offset exists in the system.