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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, the authors analyze several aspects of Discrete Hartley Transform (DHT) as an alternative to replace the conventional complex valued and mature Discrete Fourier Transform (DFT) as OFDM.
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