PAPR Reduction Comparison in FFT-Based OFDM Versus DWT-Based OFDM

In this paper, we have compared the performance of DWT OFDM and FFT OFDM. The DWT OFDM can act as a possible substitute for the Fast Fourier Transform (FFT) as there is no requirement of Cyclic Prefix due to the overlapping properties of DWT. This satisfies the orthogonality principle with the ideal reconstruction of the signal. Discrete Wavelet Transform (DWT), which is the basis of DWT OFDM, has many beneficial characteristics over FFT OFDM. Simply by replacing the FFT block with DWT in OFDM system, an improvement in performance has been detected which creates a new DWT-based OFDM system. Our simulation result shows that DWT OFDM system is superior to FFT OFDM in terms of PAPR by up to 2.3 dB with an affordable decrease in overall complexity of the system.