On the performance of linear and nonlinear companding transforms in OFDM systems

Yasir Rahmatallah, Nidhal Bouaynaya, Seshadri Mohan

Research output: Chapter in Book/Report/Conference proceedingConference contribution

12 Scopus citations

Abstract

Companding schemes are widely employed to reduce the peak-to-average-power ratio (PAPR) in orthogonal frequency division multiplexing (OFDM) systems. This paper considers the classes of linear and nonlinear companding schemes and derives a sufficient condition under which the bit error rate (BER) performance of one is superior to that of the other. The high PAPR of the OFDM signal drives the transmitter's power amplifier into its nonlinear region, thus causing nonlinear distortions. In the literature, signal companding is one of the widely used techniques for PAPR reduction. Furthermore, it has been claimed, based on simulation results, that linear companding performs better, in terms of BER, than nonlinear companding for an optimized set of companding parameters. In this paper, we derive sufficient conditions under which these claims are valid. The conditions derived also show that, in practice, nonlinear companding transforms perform better than linear companding transform. Our theoretical analysis is supported by simulation results.

Original languageEnglish (US)
Title of host publication2011 Wireless Telecommunications Symposium, WTS 2011
DOIs
StatePublished - 2011
Externally publishedYes
Event10th Annual Wireless Telecommunications Symposium, WTS 2011 - New York City, NY, United States
Duration: Apr 13 2011Apr 15 2011

Publication series

NameWireless Telecommunications Symposium
ISSN (Print)1934-5070

Other

Other10th Annual Wireless Telecommunications Symposium, WTS 2011
Country/TerritoryUnited States
CityNew York City, NY
Period4/13/114/15/11

All Science Journal Classification (ASJC) codes

  • Computer Networks and Communications
  • Signal Processing
  • Electrical and Electronic Engineering

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