An efficient blind deterministic frequency offset estimator for OFDM systems

Hyoung Goo Jeon, Kyoung Soo Kim, Erchin Serpedin

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

This paper proposes an efficient blind deterministic carrier frequency offset (CFO) estimation method for orthogonal frequency division multiplexing (OFDM) systems. In the proposed method, two OFDM symbols with time difference are generated by exploiting both the oversampled OFDM signal and the cyclic prefix, and a cost function is introduced for CFO estimation. It is shown that the cost function can be expressed as a cosine function. Using a property of the cosine function, a formula for estimating the CFO is derived. The estimator of the CFO requires three independent cost function values calculated at three different frequency offsets. Using the formula, the CFO can be estimated without searching all the frequency offset range. The proposed method is very suitable for real wireless environments since it requires only one OFDM symbol for blind reliable estimation of CFO. The computer simulations show that the performance of the proposed method is superior to those of the MUSIC method and the oversampling method. Unlike the conventional methods such as MUSIC method and the oversampling method, the accuracy of the proposed method is independent of the searching step.

Original languageEnglish
Article number5715844
Pages (from-to)1133-1141
Number of pages9
JournalIEEE Transactions on Communications
Volume59
Issue number4
DOIs
Publication statusPublished - Apr 2011
Externally publishedYes

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Keywords

  • blind carrier frequency offset estimation
  • blind deterministic estimation
  • Carrier frequency offset
  • Orthogonal Frequency Division Multiplexing (OFDM)

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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