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OFDM is an Orthogonal Frequency Division Multiplexing. It is a multiplexing technique based on parallel transmission. OFDM is used in many of the present day wireless communication techniques. It is a digital modulation scheme and is used for encoding the digital data on multiple carrier frequencies. Each subcarrier is modulated using different modulation techniques. In the first part this paper the BER performance of all digital communication techniques on AWGN, Rayleigh and rician channels are studied and compared. In the second part the performance OFDM paired with different modulation schemes are analyzed for AWGN channel.

BER Performance of Digital Modulation Schemes With and Without OFDM Model for AWGN, Rayleigh and Rician Channels