Channel equalization for Discrete Wavelet Multitone transceiver in wireline channels

Abstract

Discrete Wavelet Transform (DWT) based Multicarrier modulation (MCM) technique, namely Discrete Wavelet Multitone is a modified form of the Fourier Transform based Discrete Multitone (DMT) modulation technique, designated for wireline channels like DSL, Powerline, etc. DWMT has been recently proposed in order to overcome the drawbacks posed by DMT transceivers, such as inter-channel interference due to high side lobes, less spectral containment, use of cyclic prefixing, etc. The equalization issue with reference to DWMT is an active research area. We have analyzed the performance of a DWMT transceiver with time domain equalization techniques and compared it with DMT technique. Moreover this paper proposes the application of Overlap frequency domain equalization technique, and it is shown that Overlap-FDE gives same performance but with low complexity for the DSL channel.