Reduction of Intercarrier Interference in Orthogonal Frequency Divisions Multiplexing Systems

Future wireless communication system is expected to have a high data rate transmission. OFDM is a promising candidate for achieving high data rates in mobile environment because of its multicarrier modulation technique. A well-known problem of OFDM is its sensitivity to frequency offset between the transmitted and received carrier frequencies. This carrier frequency offset (FO) causes loss of orthogonality between sub-carriers and the signals transmitted on each carrier are not independent of each other. The orthogonality of the carriers is no longer maintained, which results in inter-carrier interference (ICI).In this paper frequency offset is reduced by using ICI self cancellation method and this scheme is confirmed through simulated results based on theoretical equations. Keywords— Orthogonal Frequency Division Multiplexing (OFDM), Intercarrier Interference (ICI), Frequency Offset (FO), ICI self cancellation (SC) and Carrier to Interference Power Ratio (CIR).