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Title:New Techniques for Multicarrier Communication Systems
Author(s):Krongold, Brian Scott
Doctoral Committee Chair(s):Jones, Douglas L.
Department / Program:Electrical Engineering
Discipline:Electrical Engineering
Degree Granting Institution:University of Illinois at Urbana-Champaign
Subject(s):Engineering, Electronics and Electrical
Abstract:Common to all OFDM systems is a large peak-to-average-power ratio (PAR) problem, which can lead to low power efficiency and nonlinear distortion at the transmit power amplifier. Tone reservation uses unavailable or reserved tones to design a peak-cancelling signal that lowers the PAR of a transmit OFDM block. Active-set methods provide a fast-converging PAR reduction technique that can be applied to real- and complex-baseband OFDM systems. In systems where data tones cannot be sacrificed, PAR reduction can be obtained using active (data-carrying) subchannels where outer constellation points are dynamically moved, within margin-preserving constraints, to reduce the peak magnitude. This scheme, known as active constellation extension (ACE), simultaneously decreases the bit error rate slightly while substantially reducing the peak magnitude.
Issue Date:2001
Description:168 p.
Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2001.
Other Identifier(s):(MiAaPQ)AAI3030449
Date Available in IDEALS:2015-09-25
Date Deposited:2001

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