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This paper discusses the effect of frequency offset on the performance of OFDM communications systems. The most important requirement in an OFDM is frequency and time synchronization as this form the reason for orthogonality between the subcarriers. However OFDM is susceptible to synchronization errors between transmitter and receiver local oscillator frequencies. This error is known as the carrier frequency offset (CFO) [1] and causes ICI and it also destroys the orthogonality between the subcarriers that's why performance of OFDM systems is degraded by the Carrier Frequency Offset (CFO) ....

Broadband wireless access systems used in residential and business environments have to face hostile radio propagation environments, with multipath delay spread extending over tens or hundreds of bit interval. OFDM is multicarrier solution to the problem occurred by multipath effects. As we know that the most important feature of OFDM is frequency and time synchronization because they are the reason for the orthogonality between the subcarriers. In OFDM communication system there is synchronization error between transmitter and receiver local oscillator frequencies known as Carrier frequency...