An all-digital frequency synchronization scheme for OFDM systems

Author

Zhenhong, Li ; Mämmelä, Aarne

Author_Institution

VTT Electron., Oulu, Finland

Volume

2

fYear

1997

fDate

1-4 Sep 1997

Firstpage

327

Abstract

The main purpose of this paper is to study the frequency synchronization problem in OFDM systems. A new frequency synchronization method is achieved by means of an all-digital synchronization loop including acquisition and tracking modes. The frequency offset is estimated only once per frame. The acquisition algorithm is based on periodically inserted reference symbols, and the tracking algorithm on the cyclic prefix of the OFDM symbols. The algorithm performance is assessed in an AWGN channel with a low SNR value and in the presence of a timing inaccuracy. The simulations show that the algorithm is accurate and the suggested frequency synchronization scheme works well

Keywords

Gaussian channels; digital communication; frequency division multiplexing; frequency estimation; synchronisation; tracking; AWGN channel; OFDM systems; acquisition; algorithm performance; all-digital frequency synchronization scheme; cyclic prefix; frequency offset; periodically inserted reference symbols; timing inaccuracy; tracking; AWGN channels; Data communication; Degradation; Frequency estimation; Frequency synchronization; OFDM; Phase estimation; Research and development; Timing; Tracking loops;

fLanguage

English

Publisher

ieee

Conference_Titel

Personal, Indoor and Mobile Radio Communications, 1997. Waves of the Year 2000. PIMRC '97., The 8th IEEE International Symposium on

Conference_Location

Helsinki

Print_ISBN

0-7803-3871-5

Type

conf

DOI

10.1109/PIMRC.1997.630922

Filename

630922