Optimal pilot placement for channel tracking in OFDM

Author

Dong, Min ; Tong, Lang ; Sadler, Brian M.

Author_Institution

Sch. of Electr. & Comput. Eng., Cornell Univ., Ithaca, NY, USA

Volume

1

fYear

2002

fDate

7-10 Oct. 2002

Firstpage

602

Abstract

The problem of optimally placing pilot symbols for tracking frequency selective fading channels in an OFDM system is considered. The time-varying channel is approximated as a Gauss-Markov process. The Kalman filter, as the optimal tracking algorithm, is used for updating channel states in frequency. For a fixed percentage of pilot symbols, assuming pilot clusters are periodically sent through (L+1) OFDM subchannels for training, we optimize the cluster size by minimizing the average steady-state mean square error (MSE) of the channel estimator. It is shown that single pilot periodic placement achieves the minimum MSE.

Keywords

Gaussian processes; Kalman filters; Markov processes; OFDM modulation; channel estimation; fading channels; mean square error methods; minimisation; mobile radio; time-varying channels; tracking filters; Gauss-Markov process; Kalman filter; OFDM; channel estimation; channel tracking; frequency selective fading channels; mobile channels; optimal pilot placement; optimal tracking algorithm; steady-state MSE; steady-state mean square error; time-varying channel; wireless communications; Bandwidth; Channel capacity; Contracts; Estimation theory; Fading; Gaussian channels; OFDM; Research initiatives; Time varying systems; Time-varying channels;

fLanguage

English

Publisher

ieee

Conference_Titel

MILCOM 2002. Proceedings

Print_ISBN

0-7803-7625-0

Type

conf

DOI

10.1109/MILCOM.2002.1180512

Filename

1180512