Orthogonal Wavelet Division Multiplexing-Comparison Study

This work deals with the enhancement of one of the main techniques that is used widely in number of communications systems these days; Orthogonal Frequency Division Multiplex (OFDM). Its powerfulness comes from improving the system's data rates even under harsh channels conditions by making use of the Inverse Fast Fourier Transform (IFFT) idea. However, it suffers from different drawbacks, which make it intrinsically obstinate, such as the Peak-to-Average Power Ratio (PAPR) and synchronization issues. Thus, an analysis of an alternative work will be provided in this work based on the wavelet transforms; wavelet packet transforms-based Daubechies 4 will be analyzed and compared to our previously published work in order to increase the OFDM-based work flexibilities. This comparison will be based on the bit error rates (BER) and exceeding the PAPR values a certain threshold. A MATLAB simulation has been performed in order to verify the reliability of the proposition in order to replace the FFT stage in the OFDM. As a result, the WPT work gives a 1 dB enhancement over the conventional OFDM at 10-
³
probability, while the previously Haar based published work enhances this value by 8.8%. in addition to enhances the BER reliability over the proposed RoF channel link.