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As the wireless communication system has evolved tremendously, leading to the need for high performance and much higher capacity for the multiuser communication systems but within the constraints of limited spectrum and limited bandwidth. The main function of OFDM is to convert a frequency selective channel into a collection of frequency-Flat sub channels with partially overlapping spectra. The differentiating factor of this scheme is the orthogonality provided to the subcarriers that provided synchronisation and helps in avoiding ISI. An OFDM signal consists of a number of closely spaced modulated carriers.
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