Performance Analysis of Discrete Hartley Transform Based OFDM Modulator and Demodulator

We are developing an alternative technique to replace the conventional complex DFT-Based OFDM system. The proposed technique is simpler and faster than conventional one because it requires only real arithmetic computations. This technique is known as discrete Hartley transform and has a closely related with Fourier transform. The performance of OFDM modulator and demodulator based on DHT was carried out with giving binary random data as the data sources. After processed by IDHT as the modulation function, the signals were then transmitted via the dispersive channel with using additive white Gaussian noise (AWGN) as the channel model. The transmitted signals were detected in receiver part with reverse processes as done in transmitter part. The measurements of parameters were repeated five times to obtain and to calculate the accuracy of the new system. The plotted graph of average BER versus SNR showed that the BER was decreased when the given value of SNR was increased. The analysis of system performance was also evaluated for several numbers of subcarriers used and the results showcased some advantages. The modification of DHT algorithm is expected to reduce the complexity and time consuming for long-length of computational on the performing of OFDM modulator and demodulator based on DHT.