Performance Comparison of Discrete Hartley Transform (DHT) and Fast Fourier Transform (FFT) OFDM System in AWGN Channel

Abstract

In the current scenario so many advanced techniques are finding a way as a substitute for complex DFT - based OFDM system. One of such type of technique is Discrete Hartley Transform. The re- quirement of only real arithmetic computations for the proposed technique makes it more advantageous in terms of simplicity and computational speed than conventional one. This technique is very closely related to Discrete Fourier Transform. The performance of DHT based OFDM system is carried out using raw data as well as with some images as the sources and after processing at the trans- mitter end, the signals are then transmitted through channel. Addi- tive White Gaussian Noise (AWGN) has been considered for chan- nel modeling. For accuracy of this simulation, the measurement of parameters has been repeated multiple times. The simulated result- ing graph between Bit Error rate and SNR shows the improvement of performance. The system performancewas analyzed for M- PSK mapping schemes with various values of M, where M is order of modulation technique used. Simulation has been performed on MATLAB 7.0.