Simulation of Models and BER Performances of DWT-OFDM versus DAUBECHIES-OFDM

Abstract

OFDM technique is widely used due to its high spectrum efficiency. Fast Fourier Transforms (FFT) has been used to generate the orthogonal sub-carriers. Implementation complexity of FFT based OFDM, has led to replace conventional FFT based OFDM by wavelet based OFDM. The main objective of this paper is to replace the conventional FFT based OFDM system with some orthonormal wavelets. Comparing with the conventional OFDM, it is found that the Haar and Daubechies-based orthonormal wavelets are capable of reconstructing the transmitted symbol at the receiver side and effect of noise is reduced using wavelet denoising for different SNRs on AWGN channel. In this paper, results are tabulated for transmitted symbols and reconstructed symbols after wavelet denoising & compared for an analysis. The scatterplot analysis of DWT-OFDM is also presented for different SNRs.