Estimation of rapid time-variant channels for OFDM using Wiener filtering

Author

Sgraja, Christian ; Lindner, Jürgen

Author_Institution

Dept. of Information Technol., Ulm Univ., Germany

Volume

4

fYear

2003

fDate

11-15 May 2003

Firstpage

2390

Abstract

The performance of orthogonal frequency division multiplexing (OFDM) deteriorates in a rapidly time-varying environment due to the loss of orthogonality, resulting in inter-channel interference (ICI). Moreover, the quality of model-based channel estimation may degrade if the estimator has been designed for a time-invariant scenario. In this paper, we consider OFDM and pilot-aided channel estimation via Wiener filtering and derive the filter for a time-variant WSSUS model. In addition, the analysis allows to compute the performance loss for an improper estimation filter which suffers from the problem of model mismatch.

Keywords

OFDM modulation; Wiener filters; adjacent channel interference; channel estimation; time-varying channels; OFDM; Wiener filtering; channel estimation; estimation filter; interchannel interference; orthogonal frequency division multiplexing; orthogonality loss; pilot-aided channel estimation; rapid time-variant channels estimation; time-variant wide-sense stationary uncorrelated scattering; time-varying environment; Channel estimation; Degradation; Delay; Digital video broadcasting; Information technology; Interchannel interference; OFDM; Performance loss; Stochastic processes; Wiener filter;

fLanguage

English

Publisher

ieee

Conference_Titel

Communications, 2003. ICC '03. IEEE International Conference on

Print_ISBN

0-7803-7802-4

Type

conf

DOI

10.1109/ICC.2003.1204362

Filename

1204362