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   -> Volume 4, Issue 11


Thesis: Multiplexed Communication Via Wavelet Packets
 
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lindseya@rl.af.mil
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PostPosted: Fri Dec 06, 2002 9:36 am    
Subject: Thesis: Multiplexed Communication Via Wavelet Packets
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Thesis: Multiplexed Communication Via Wavelet Packets

The following work was completed in June 1995 and is publicly
available via anonymous ftp at voyager.cns.ohiou.edu in directory
/pub/papers/lindsey/dissert.

The author can be reached at lindseya@rl.af.mil or via snail-mail at
RL/C3BB, 525 Brooks Road, Griffiss AFB, NY 13441-4505

Ph.D. DISSERTATION, June 1995:
Alan R. Lindsey
Electrical and Computer Engineering
Ohio University, Athens, Ohio

Generalized Orthogonally Multiplexed Communication Via Wavelet Packet
Bases (118pp.)

Building on recently introduced multidimensional signaling
techniques, a generalized multirate wavelet-based modulation format is
presented. Wavelet Packet Modulation employs customizable wavelet
packet basis functions from an arbitrary pruning of a dyadic filter
bank as novel pulse shapes upon which independent QAM data at lower
rates are placed; in fact, QAM is one of many special cases of this
general scheme. The advantages include dimensionality in both time and
frequency for flexible channel exploitation and an efficient and
practical transceiver implementation with all-digital filter banks.
The filter bank implementation also allows for adaptation and a method
for optimizing the supersymbol for channels corrupted by tones and
impulses is introduced. Supersymbol tuning, which isolates these
common noise sources to a fraction of the supersymbol, allows much of
the transmitted data to pass without interference. The superior
computational performance of the algorithm is illustrated in light of
the explosive combinatorics of the wavelet packet libraries, and more
complex enhancements/alternatives are given.

Subjects: Communications, Feedback Adaptive, Wavelet Transform
Implementations

Keywords: Wavelets, Communication, Time-frequency, Multi-dimensional
Signaling, Adaptation, Wavelet Packets, Orthogonally Multiplexed
Communication, Supersymbol Tuning
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