Study of ICI Cancellation techniques in OFDM

OFDM (Orthogonal frequency division multiplexing) is a well known technique in 4G Broadband wireless communication systems. OFDM has high spectral efficiency but it suffers from frequency offset problem due to the difference between transmitter and receiver local oscillator frequencies which causes loss of orthogonality between subcarriers leading to ICI. This degrades the performance of system so there is a need to suppress it. In this paper we studies three different ICI Cancellation techniques namely Self Cancellation, two path complex conjugate and Phase Rotated complex conjugate technique in OFDM.