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Amplitude and Sign Adjustment for Peak-to-Average-Power Reduction

Sharif, Masoud and Florens, Cedric and Fazel, Maryam and Hassibi, Babak (2005) Amplitude and Sign Adjustment for Peak-to-Average-Power Reduction. IEEE Transactions on Communications, 53 (8). pp. 1243-1247. ISSN 0090-6778. http://resolver.caltech.edu/CaltechAUTHORS:SHAieeetc05

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Abstract

In this letter, we propose a method to reduce the peak-to-mean-envelope-power ratio (PMEPR) of multicarrier signals by modifying the constellation. For$M$-ary phase-shift keying constellations, we minimize the maximum of the multicarrier signal over the sign and amplitude of each subcarrier. In order to find an efficient solution to the aforementioned nonconvex optimization problem, we present a suboptimal solution by first optimizing over the signs, and then optimizing over the amplitudes given the signs. We prove that the minimization of the maximum of a continuous multicarrier signal over the amplitude of each subcarrier can be written as a convex optimization problem with linear matrix inequality constraints. We also generalize the idea to other constellations such as 16-quadrature amplitude modulation. Simulation results show that by an average power increase of 0.21 dB, and not sending information over the sign of each subcarrier, PMEPR can be decreased by 5.1 dB for a system with 128 subcarriers.


Item Type:Article
Additional Information:© Copyright 2005 IEEE. Reprinted with permission. Paper approved by A. K. Khandani, the Editor for Coding and Information Theory of the IEEE Communications Society. Manuscript received February 13, 2004; revised October 20, 2004. [Posted online: 2005-08-15] This work was supported in part by the National Science Foundation under Grant CCR-0133818, in part by the Office of Naval Research under Grant N00014-02-1-0578, and in part by Caltech’s Lee Center for Advanced Networking. This paper was presented in part at the IEEE International Conference on Communications, Paris, France, June 2004.
Subject Keywords:Convex optimization, orthogonal frequency-division multiplexing (OFDM), peak-to-average-power ratio, sign adjustment
Record Number:CaltechAUTHORS:SHAieeetc05
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:SHAieeetc05
Alternative URL:http://dx.doi.org/10.1109/TCOMM.2005.852830
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:6505
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:11 Dec 2006
Last Modified:26 Dec 2012 09:22

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