Companding transform for reduction in peak-to-average power ratio of OFDM signals

Xiao Huang, Jianhua Lu, Junli Zheng, Khaled Letaief, Jun Gu

Research output: Contribution to journalArticle

170 Citations (Scopus)


In this paper, a general companding transform method is proposed to effectively reduce peak-to-average power ratio (PAPR) of orthogonal frequency division multiplexing (OFDM) signals. By compressing large signals while enhancing small signals along with taking into account their statistical characteristics, this method can achieve significant reduction in PAPR with low implementation complexity. Specifically, we present the design criteria of the transform, which enable effective tradeoff between reduction in PAPR and bit-error rate performance of the OFDM system. It is shown by simulations that the proposed method may significantly improve the performance of OFDM systems in radio channels by carefully choosing the companding form and parameters.

Original languageEnglish
Pages (from-to)2030-2039
Number of pages10
JournalIEEE Transactions on Wireless Communications
Issue number6
Publication statusPublished - Nov 2004
Externally publishedYes



  • Companding transform
  • Orthogonal frequency division multiplexing (OFDM)
  • Peak-to-average power ratio (PAPR)

ASJC Scopus subject areas

  • Engineering(all)
  • Computer Networks and Communications

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