FFT Factorization Technique for OFDM System

Abstract

For OFDM communication systems, the frequency offsets in mobile radio channels deteriorate the orthogonality between subcarriers resulting in Inter Carrier Interference (ICI). ICI causes power leakage among subcarriers thus degrading the system performance. A well-known problem of OFDM is its sensitivity to frequency offset between the transmitted and received carrier frequencies. This research work investigates three bandwidth efficient methods for combating the effects of ICI: DFT-OFDM algorithm, two path algorithm (TPA) and these three methods are compared in terms of bit error rate performance with Proposed FFT Factorization Technique. Through simulations, it is shown that proposed Technique is much effective in mitigating ICI at high frequency offset.