New Techniques for Multicarrier Communication Systems
Krongold, Brian Scott
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Permalink
https://hdl.handle.net/2142/80751
Description
Title
New Techniques for Multicarrier Communication Systems
Author(s)
Krongold, Brian Scott
Issue Date
2001
Doctoral Committee Chair(s)
Jones, Douglas L.
Department of Study
Electrical Engineering
Discipline
Electrical Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Electronics and Electrical
Language
eng
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.
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