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On the peak-to-average power of OFDM signals based on oversampling

Sharif, Masoud and Gharavi-Alkhansari, Mohammad and Kalaj, Babak H. (2003) On the peak-to-average power of OFDM signals based on oversampling. IEEE Transactions on Communications, 51 (1). pp. 72-78. ISSN 0090-6778. http://resolver.caltech.edu/CaltechAUTHORS:SHAieeetc03

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Abstract

Orthogonal frequency-division multiplexing (OFDM) introduces large amplitude variations in time, which can result in significant signal distortion in the presence of nonlinear amplifiers. We introduce a new bound for the peak of the continuous envelope of an OFDM signal, based on the maximum of its corresponding oversampled sequence; it is shown to be very tight as the oversampling rate increases. The bound is then used to derive a closed-form probability upper bound for the complementary cumulative distribution function of the peak-to-mean envelope power ratio of uncoded OFDM signals for sufficiently large numbers of subcarriers. As another application of the bound for oversampled sequences, we propose tight relative error bounds for computation of the peak power using two main methods: the oversampled inverse fast Fourier transform and the method introduced for coded systems based on minimum distance decoding of the code.


Item Type:Article
Additional Information:© Copyright 2003 IEEE. Reprinted with permission. Paper approved by C. Tellambura, the Editor for Modulation and Signal Design of the IEEE Communications Society. Manuscript received July 21, 2001; revised February 10, 2002; February 27, 2002; April 12, 2002; and May 20, 2002. [Posted online: 2003-02-25] This paper was presented in part at the IEEE International Conference on Communications, New York, NY, May 2002. The authors are indebted to C. Tellambura for his comment on Theorem 1 that improved the bound and changed the theorem to its present form. Thanks are also due to the anonymous reviewers for their constructive suggestions.
Subject Keywords:Bernstein inequality, orthogonal frequency-division multiplexing (OFDM), oversampling, peak-to-average power ratio (PAPR), peak-to-mean envelope power ratio (PMEPR)
Record Number:CaltechAUTHORS:SHAieeetc03
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:SHAieeetc03
Alternative URL:http://dx.doi.org/10.1109/TCOMM.2002.807619
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:6520
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:12 Dec 2006
Last Modified:26 Dec 2012 09:22

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