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Performance comparison between wavelet-based OFDM system and iFFT-based OFDM system

In this paper, we design and evaluate the wavelet-OFDM (wavelet orthogonal frequency division multiplexing) system based on wavelet transform. Wavelet transform has functions other than the Fourier transform using sine and cosine functions as well as the number of wavelets. In addition, various wavelets are used for wavelet transformation, and the change of signals according to the wavelets can be confirmed. In the conventional CP-OFDM (cyclic prefix orthogonal frequency division multiplexing), inverse fast fourier transform (IFFT) is used. In the wavelet-OFDM system, inverse discrete wavelet transform (IDWT) is used. Therefore, this study confirms bit error rate (BER), peak to average power ratio (PAPR) and OOB (out of band) characteristics of the two systems through simulation results. Comparing the characteristics of the conventional OFDM and the wavelet-OFDM, the same BER performance is shown. However, it can be confirmed that the wavelet-OFDM has lower PAPR performance than that of the conventional OFDM, and OOB is also lower than that of the conventional OFDM.