Orthogonal Frequency Division Multiplexing (OFDM) is a multi-carrier modulation technique. It provides high bandwidth efficiency because the carriers are orthogonal to each other and multiple carriers share the data among themselves. It has been adopted by most wireless and wired communication standards. The idea is to utilize a number of carriers, spread regularly over a frequency band, in such a way so that the available bandwidth is utilized to maximal efficiency. The main advantage of this transmission technique is its robustness to channel fading in wireless communication environment.