Abstract
The mobile communication system is interfered with multipath fading. At transmitter end, the signals are received from different angle and time. This result in, delay in the signal of reflections from the different obstructions. In order to solve this problem, Orthogonal Frequency Division Multiplexing (OFDM) is introduced. In this paper, OFDM technology is used that gives the best Bit Error Rate (BER) performance in a multi path fading environment using computer simulation. The system implements using two different phase modulations which are, Differential Quadrature Phase Shift Keying (DQPSK) and Binary Phase Shift Keying (BPSK). Subsequently, ideal and worst cases of the communication channel models are also demonstrated. The system is designed using MATLAB coding for BPSK-OFDM and DQPSK-OFDM are written under various physical path conditions such as; Additive White Gaussian Noise (AWGN) and Rayleigh multipath fading channel. It is defined that using proposed technique, the Eb/No=6, the BER is −20.00259x10isachievedforunderAWGN.The −1Eb/No=6 is 0.05302x10is attained for Rayleigh, −2Eb/No=6dBis0.00259x10 recorded while for fultipath Rayleigh. The result shows that the BER performance for BPSK-OFDM is better than DQPSK-OFDM.