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A simple RLS-POCS solution for reduced complexity ADSL impulse shortening

Recently, with the realization of the World Wide Web, the tremendous
need for high-speed data communications has grown. Several access techniques
have been proposed which utilize the existing copper twisted pair cabling. Of
these, the xDSL family, particularly ADSL and VDSL, have shown great promise
in providing broadband or near-broadband access through the common telephone
lines. A critical component of the ADSL and VDSL systems is the guard band
needed to eliminate the interference caused by the previously transmitted blocks.
This guard band must come in the form of redundant samples at the start of every
transmit block, and be at least as long as the channel impulse response. Since the
required guard band length is much greater than the length of the actual transmitted
samples, techniques to shorten the channel impulse response must be considered.
In this thesis, a new algorithm based on the RLS error minimization and POCS
optimization techniques will be applied to the channel impulse-shortening problem
in an ADSL environment. As will be shown, the proposed algorithm will provide a much better solution with a minimal increase in complexity as compared to the existing LMS techniques. / Graduation date: 2000

Identiferoai:union.ndltd.org:ORGSU/oai:ir.library.oregonstate.edu:1957/33076
Date03 September 1999
CreatorsHelms, Sheldon J.
ContributorsStonick, Virginia L.
Source SetsOregon State University
Languageen_US
Detected LanguageEnglish
TypeThesis/Dissertation

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