Shape Up: Peak -Power Reduction via Constellation Shaping
Kwok, Henry K.
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Permalink
https://hdl.handle.net/2142/80710
Description
Title
Shape Up: Peak -Power Reduction via Constellation Shaping
Author(s)
Kwok, Henry K.
Issue Date
2001
Doctoral Committee Chair(s)
Douglas Jones
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
For high rate systems, the hyperspherical and hyperdiamond shaping reduce the unclipped peak power by 5 to 7 dB with no loss of data rate and with a symbol error rate that is virtually identical to that of conventional systems. With a clipping rate of 10-8, they still provide up to 2.8 dB of peak-power reduction. Algebraic shaping reduces the unclipped peak power by 8 to 10 dB and about 2.9 dB at a clipping rate of 10-8 for 16-channel systems. Moreover, algebraic shaping asymptotically provides an unlimited amount of peak-power reduction as the number of channels and the constellation size increase. It also approaches the PAR characteristics of a single-carrier system (such as QAM or PAM) as the number of constellation points per channel increases. In addition, we present an O( N log2N) algorithm using a discrete Hadamard transform-based OFDM and introduce a method for incorporating arbitrary lattice codes inside the shaped boundary.
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