Low Complexity OFDM Modulator and Demodulator Based on Discrete Hartley Transform

The investigation on discrete Hartley transform (DHT) as an alternative to replace the conventional complex valued and mature discrete Fourier transform (DFT) as OFDM modulator and demodulator was carried out in this research. The random binary data was generated and transmitted via the dispersive channel with using additive white Gaussian noise(AWGN) channel model. The performance of the system was evaluated by calculating the number of bit errors for several value of signal to noise ratio (SNR). 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 verses SNR showed that the BER was decreased with the increasing of given value SNR. The analysis of system performance was also evaluated for several numbers of sub carriers 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.