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OFDM is a multi carrier transmission technique which divides the available spectrum into many carriers each one being modulated by a low data rate stream. A large number of closely spaced orthogonal sub-carrier signals are used to carry data. The data is divided into several parallel data streams or channels, one for each sub-carrier. Each sub-carrier is modulated with a conventional modulation scheme at a low symbol rate. OFDM uses the spectrum more efficiently by spacing the channels much closer together this is achieved by making all the carriers orthogonal to one another, preventing interference from closely spaced carriers. The main advantage of this transmission technique is its robustness to channel fading in the wireless communication environment.

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