CFO estimation schemes for differential OFDM systems

Xiang Nian Zeng, Ali Ghrayeb

Research output: Contribution to journalArticle

7 Citations (Scopus)


This paper proposes two blind carrier frequency offset (CFO) estimation schemes for differentially modulated orthogonal frequency division multiplexing (OFDM) systems. The proposed schemes estimate the fractional part of the CFO with only two consecutive OFDM blocks, and they exploit two implicit properties associated with differentially modulated OFDM (DOFDM) systems, i.e., the channel keeps constant over two consecutive OFDM blocks, and the DOFDM systems employ an M-ary phase-shift keying constellation. One of the schemes is based on the finite alphabet (FA) constraint and the other one is based on the constant modulus (CM) constraint. They provide a trade-off between the performance and computational complexity. The constrained Cramer-Rao lower bound is also derived. Several numerical examples are presented to validate the efficacy of the proposed schemes.

Original languageEnglish
Article number4786492
Pages (from-to)124-129
Number of pages6
JournalIEEE Transactions on Wireless Communications
Issue number1
Publication statusPublished - 1 Jan 2009



  • Carrier frequency offset (CFO)
  • Constant modulus (CM)
  • Differential modulation
  • Finite alphabet (FA)
  • Orthogonal frequency division multiplexing (OFDM)

ASJC Scopus subject areas

  • Computer Science Applications
  • Electrical and Electronic Engineering
  • Applied Mathematics

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