A new carrier frequency loop for OFDM systems

Author

Lottici, Vincenzo ; D´Andrea, Aldo N. ; Mengali, Umberto

Author_Institution

Dept. of Inf. Eng., Pisa, Italy

Volume

46

Issue

4

fYear

2000

fDate

11/1/2000 12:00:00 AM

Firstpage

970

Lastpage

979

Abstract

We derive a decision-directed carrier frequency estimator for OFDM systems. The estimator has a closed loop structure and is based on maximum likelihood inspired methods. A simplified version of the loop is also developed that can be implemented with relatively low complexity and acceptable degradations compared with the optimum scheme. The estimation accuracy is assessed by computer simulation for AWGN and frequency-selective multipath channels. Comparisons are made with other schemes discussed in the literature. Simulation results indicate that the proposed loop has better performance

Keywords

AWGN channels; OFDM modulation; closed loop systems; computational complexity; fading channels; frequency estimation; maximum likelihood estimation; multipath channels; AWGN channels; DFT; ISI; MLE; OFDM systems; carrier frequency loop; closed loop structure; computational complexity reduction; computer simulation; decision-directed carrier frequency estimator; estimation accuracy; frequency-selective multipath channels; intersymbol interference; low complexity loop; maximum likelihood methods; mobile wireless channel; multipath fading; performance; Degradation; Digital video broadcasting; Fading; Frequency estimation; Frequency locked loops; Frequency synchronization; Intersymbol interference; Maximum likelihood estimation; OFDM modulation; Streaming media;

fLanguage

English

Journal_Title

Consumer Electronics, IEEE Transactions on

Publisher

ieee

ISSN

0098-3063

Type

jour

DOI

10.1109/30.920448

Filename

920448