Globally optimum ML estimation of timing and frequency offset in OFDM systems

Navid Lashkarian, Sayfe Kiaei

Research output: Chapter in Book/Report/Conference proceedingConference contribution

5 Scopus citations


In this paper we present a globally optimum maximum likelihood estimator for carrier frequency and symbol timing synchronization of orthogonal frequency division modulation (OFDM) systems. The approach proposed here is an extension of the previously proposed estimation method given in [1]. Our research indicates that the previously proposed likelihood metric does not globally characterize the estimation problem. Based on this observation, a new likelihood function for the joint timing and frequency offset estimation is derived. The resulting probabilistic measure is used to develop an unbiased ML estimator. Furthermore, a moment estimator for carrier frequency offset estimation under uncertain symbol timing is proposed and statistical property of this estimator is analyzed. In comparison to the previously proposed methods, the proposed estimator is computationally and statistically efficient which makes the estimator more attractive for real time applications. Performance of the proposed estimator is assessed through computer simulations.

Original languageEnglish (US)
Title of host publicationIEEE International Conference on Communications
Number of pages5
StatePublished - 2000
Externally publishedYes
Event2000 IEEE International Conference on Communications - New Orleans, LA, USA
Duration: Jun 18 2000Jun 22 2000


Other2000 IEEE International Conference on Communications
CityNew Orleans, LA, USA

ASJC Scopus subject areas

  • General Engineering


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