Orthogonal frequency-division multiplexing (OFDM) [1] is a method of encoding digital data on multiple carrier frequencies. OFDM[1] has developed into a popular scheme for wideband digital communication, whether wireless or over copper wires, used in applications such as digital television and audio broadcasting, DSL Internet access, wireless networks, powerline networks, and 4G mobile communications. In the Several wireless standards such as IEEE 802.11a[2] and HiperLAN2[3].The orthogonality of the subcarriers is no longer maintained which results in ICI (Inter carrier Interference)[4] .ICI reduction techniques achieve a better SNR and BER in OFDM at zero phase noise variance . This technique will use a large number of closely spaced orthogonal subcarriers to avoid phase noise. It provides high data rates with sufficient robustness to radio channel damages. A major problem in OFDM is carrier frequency offset error between the transmitted and received signals. Due to this the orthogonality of the subcarriers is no longer maintained which results in ICI (Inter carrier Interference). In this paper, we used the ICI self-cancellation technique and reduced the ICI and improved the BER and SNR we are also calculate the SNR=15db and 20db at different phase noise variance.