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Towards reducing the gap between PMEPR of multicarrier and single carrier signals

Sharif, Masoud and Hassibi, Babak (2005) Towards reducing the gap between PMEPR of multicarrier and single carrier signals. In: IEEE Workshop on Signal Processing Advances in Wireless Communications, 6th, New York, NY, 5-8 June 2005. IEEE , Piscataway, NJ, pp. 380-384. ISBN 0780388674 http://resolver.caltech.edu/CaltechAUTHORS:SHAspawc05

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Abstract

It has recently been shown that by altering the sign of each subcarrier in a multicarrier system significant reduction in the peak to mean envelope power (PMEPR) can be obtained. In fact, the PMEPR can even be made a constant independent of the number of subcarriers n. However, finding the best sign requires a search over 2^n possible signs which is computationally prohibitive. In this paper, we first propose a greedy algorithm to choose the signs based on p-norm minimization and we prove that it can achieve a PMEPR of order log n. We further decrease the PMEPR by enlarging the search space considered by the greedy algorithm. By ignoring peaks with probability less than l0^-3, simulation results show that the PMEPR of a multicarrier system with 128 subcarriers each one modulated by 64QAM constellations is reduced to 3.4. This implies that at the cost of one bit of information per subcarrier (i.e., not sending information over the sign of each subcarrier) and modest computational complexity in the transmitter, the PMEPR can be reduced from 12.5 to 3.4 which is within 1.6 dB of the PMEPR of a single carrier system with 64QAM modulation.


Item Type:Book Section
Additional Information:© 2005 IEEE. Reprinted with Permission. Publication Date: 5-8 June 2005. Posted online: 2005-09-12. This work was supported in part by the National Science Foundation under grant no. CCR-0133818, by the Office of Naval Research under grant no. N00014-02-1-0578, and by Caltech's Lee Center for Advanced Networking.
Subject Keywords:computational complexity; greedy algorithms; minimization; probability; quadrature amplitude modulation; signal processing; subscriber loops; transmitters; 64-QAM constellation; PMEPR; multicarrier system; p-norm minimization; peak-mean envelope power; search space; single carrier signal; subcarrier
Record Number:CaltechAUTHORS:SHAspawc05
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:SHAspawc05
Alternative URL:http://dx.doi.org/10.1109/SPAWC.2005.1506051
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:9740
Collection:CaltechAUTHORS
Deposited By: Kristin Buxton
Deposited On:13 Mar 2008
Last Modified:26 Dec 2012 09:52

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