An improved frequency offset estimator for OFDM applications

Author

Morelli, Michele ; Mengali, Umberto

Author_Institution

Dept. of Inf. Eng., Pisa Univ., Italy

Volume

3

Issue

3

fYear

1999

fDate

3/1/1999 12:00:00 AM

Firstpage

75

Lastpage

77

Abstract

An efficient algorithm has been proposed by Schmidl and Cox (see IEEE Trans. Commun., vol.45, p.1613-21, 1997) for carrier frequency estimation in orthogonal frequency-division multiplexing systems. The scheme is based on the transmission of a training symbol composed of two identical halves in the time domain. We extend this algorithm by considering a training symbol composed of L>2 identical parts. This makes it possible to achieve a better accuracy at the cost of some increase in computational load. The estimation range can be made as large as desired without the need of a second training symbol, as required by the Schmidl and Cox method.

Keywords

OFDM modulation; frequency estimation; OFDM applications; accuracy; algorithm; carrier frequency estimation; computational load; estimation range; frequency offset estimator; orthogonal frequency-division multiplexing; training symbol transmision; Asynchronous transfer mode; Bandwidth; Costs; Doppler shift; Frequency division multiplexing; Frequency estimation; Frequency-selective fading channels; Matched filters; OFDM; Oscillators;

fLanguage

English

Journal_Title

Communications Letters, IEEE

Publisher

ieee

ISSN

1089-7798

Type

jour

DOI

10.1109/4234.752907

Filename

752907