An Analytical Approach for Efficient OFDM Modulator and Demodulator Communication Systems Based on Discrete Hartley Transform
Sonal Sharma, Sumit Sharma
Abstract
The main drawback of OFDM is its high peak to average power ratio (PAPR). High PAPR of OFDM makes it unusable in non-linear systems. So the clipping signals scheme is one useful and simple method to reduce the PAR. In the widely used OFDM (Orthogonal Frequency Division Multiplexing) systems, the FFT and IFFT pair is used to modulate and demodulate the data constellation on the subcarriers. This paper presents a high level implementation of a high performance FFT for OFDM Modulator and Demodulator. In this paper we analyzes several aspects of discrete Hartley transform (DHT) as an alternative to replace the conventional complex valued and mature discrete Fourier transform (DFT) as OFDM .The random binary data was generated and transmitted via the dispersive channel with using additive white Gaussian noise (AWGN) channel model. We also analyze several aspects on the performance of the system was which valuated by calculating the number of bit errors for several value of signal to noise ratio (SNR).As compared to the conventional method we also compare so that we can improve the power of the system.
Keyword
OFDM, PAPR, DHT, DFT.