Modified Self Cancellation for Reduction of Inter Carrier Interference in Orthogonal frequency division multiplexing System

Abstract

Orthogonal frequency division multiplexing (OFDM) is considered as a one of the best modulation schemes in wireless communications however, OFDM suffers from the Sensitivity to frequency offset his frequency offset introduces the problem of inter-carrier interference (ICI) in OFDM system. This Project presents a new self-cancellation technique (modified self-cancellation technique) using the self-cancellation technique with zero – gab. In proposed technique a zero sub-carriers carries are used in order to mitigate the interference occurred by the main – lobe of the two adjacent sub-carriers, in addition to zeros sub-carrier, the proposed technique used selfcancellation in order To mitigate the effect of the side-lobes of other sub-carriers. In terms of carrier-to-interference ratio (CIR) and bit-error rate (BER) the modified selfcancellation technique gives good results compared to that using only the Conventional selfcancellation technique.