Low complexity pilot assisted carrier frequency offset estimation for OFDMA uplink systems

Kilbom Lee, Sung Hyun Moon, Sang Rim Lee, Inkyu Lee

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


In this letter, we propose a low complexity pilot aided carrier frequency offset (CFO) estimation algorithm for orthogonal frequency division multiplexing access (OFDMA) uplink systems based on two consecutive received OFDMA symbols. Assuming that the channels and the CFOs are static over the two consecutive symbols, we express the second received OFDMA symbol in terms of the CFOs and the first OFDMA symbol. Based on this signal model, a new estimation algorithm which obtains the CFOs by minimizing the mean square distance between the received OFDMA symbol and its regenerated signal is provided. Also, we implement the proposed algorithm via fast Fourier transform (FFT) operations by utilizing the block matrix inversion lemma and the conjugate gradient method. Simulation results show that the proposed algorithm approaches the average Cramer Rao bound for moderate and high signal to noise ratio (SNR) regions. Moreover, the algorithm can be applied for any carrier assignment schemes with low complexity.

Original languageEnglish
Article number6210331
Pages (from-to)2690-2695
Number of pages6
JournalIEEE Transactions on Wireless Communications
Issue number8
Publication statusPublished - 2012

Bibliographical note

Funding Information:
Manuscript received June 29, 2011; revised January 3, 2012; accepted April 8, 2012. The associate editor coordinating the review of this paper and approving it for publication was A. Ghrayeb. This work was supported in part by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MEST) (No. 2010-0017909), and in part by the Seoul R&BD program (WR080951). K. Lee, S.-R. Lee, and I. Lee are with the School of Electrical Engineering, Korea University, Seoul, Korea (e-mail: {bachhi, sangrim78, inkyu}@korea.ac.kr). S.-H. Moon is with the Electronics and Telecommunications Research Institute (ETRI), Daejeon, Korea (e-mail: sh.moon@etri.re.kr). Digital Object Identifier 10.1109/TWC.2012.052512.111241


  • CFO
  • estimation
  • synchronization

ASJC Scopus subject areas

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


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