A blind carrier frequency offset estimation scheme for OFDM systems with constant modulus signaling

Xiang Nian Zeng, Ali Ghrayeb

Research output: Contribution to journalArticle

45 Citations (Scopus)


This paper presents a new blind carrier frequency offset (CFO) estimation scheme for orthogonal frequency division multiplexing (OFDM) systems with constant modulus (CM) signaling. Both single-input single-output (SISO) systems and multiple-input multiple-output (MIMO) systems with orthogonal space-time block coding are considered. The proposed scheme is based on the reasonable assumption that the channel frequency response changes slowly in the frequency domain, which implies that the channel frequency response on two consecutive subcarriers is approximately the same. Based on this assumption, cost functions are derived in closed-form, which minimize the difference between the signal power of two neighboring subcarriers. The identifiability of the proposed scheme is mathematically proved, which implies that minimizing the derived cost function gives an approximate estimate of the CFO. We demonstrate that the proposed scheme provides an excellent trade-off between complexity and performance as compared to prominent existing estimation schemes.

Original languageEnglish
Pages (from-to)1032-1037
Number of pages6
JournalIEEE Transactions on Communications
Issue number7
Publication statusPublished - Jul 2008
Externally publishedYes



  • Carrier frequency offset (CFO)
  • Constant modulus (CM)
  • Multiple-input multiple-output (MIMO) systems
  • Orthogonal frequency division multiplexing (OFDM)
  • Orthogonal space-time block code (OSTBC)

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Electrical and Electronic Engineering

Cite this