NDLI: Wavelet packet based multicarrier modulation

Content Provider	IEEE Xplore Digital Library
Author	Van Bouwel, C. Potemans, J. Schepers, S. Nauwelaers, B. Van de Capelle, A.
Copyright Year	2000
Description	Author affiliation: ESAT-TELEMIC, Katholieke Univ., Leuven, Belgium (Van Bouwel, C.)
Abstract	A recent but already popular technique for broadband communications is multicarrier modulation, which divides the channel into several orthogonal, overlapping subchannels. Multicarrier modulation is normally implemented using a Fourier transform to create and detect the different subcarriers. This can be efficiently implemented using an (I)FFT. This transform however has the drawback that it uses a rectangular window, which creates rather high sidelobes. This leads to rather high interference when the channel impairments cannot be fully compensated. Looking at other transforms leads us to the wavelet transform, and more specifically the wavelet packet transform, which has more flexibility and due to the time-overlap can have much lower sidelobes. This article studies the implementation of these wavelet packets, and the effects this implementation has on the requirements imposed in the design of usable wavelets. It is shown that the restrictions imposed by the perfect reconstruction requirement necessitate the use of biorthogonal wavelets. This however influences the performance. Moreover, the frequency behaviour of the wavelet packet transform is not straightforward which limits the practical use of this transform in a multicarrier system.
Starting Page	131
Ending Page	138
File Size	771731
Page Count	8
File Format	PDF
ISBN	0780366840
DOI	10.1109/SCVT.2000.923351
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2000-10-19
Publisher Place	Belgium
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Wavelet packets Wavelet transforms Frequency Fourier transforms Narrowband Phase shift keying Quadrature amplitude modulation Interference Broadband communication Telephony
Content Type	Text
Resource Type	Article

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