International Journal of Research in Electronics & Communication Technology (IJRECT)
The new mobile technologies trying to give broadband over wireless channel allowing the user to have bandwidth connectivity even inside moving vehicle. The metropolitan broadband wireless networks require a Non-Line-Of-Sight (NLOS) capability, and the scheme Orthogonal Frequency Division Multiplex (OFDM) becomes essential to overcome the effects of multipath fading. Orthogonal Frequency Division Multiplexing (OFDM) has become very popular, allowing high speed wireless communications. OFDM could be considered either a modulation or multiplexing technique and its hierarchy corresponds to the physical and medium access layer.