Design of WPM System using QPSK Modulation for Different Wavelets

Abstract

To achieve high-speed network is a challenging task. Wavelet packet Modulation (WPM) is the promising technology for high-speed data transfer between the nodes within the network. WPM comprises of multicarrier modulation technique that overcomes the disadvantages of OFDM for efficient data transfer between the nodes of the network. The selection of proper wavelets for the WPM system is also important to achieve efficient communication between the nodes. In this paper, WPM based system has been established by using Quadrature Phase shift Keying (QPSK) modulation. In order to get a reliable and an efficient data transfer between the nodes, different wavelets were experimented by making use of the system. Almost, similar kinds of performances are observed for the wavelets (Daubechies, Haar, Symlet and Coiflet) in the proposed WPM system for values of SNR in range 0 to 20 db. If the value of SNR goes beyond 20 db then measurable differences are notable for the same wavelets in the system. Under different channel conditions, the WPM system was tested to conclude the final wavelet and channel condition for better performance of the system.