Maximum-delay-spread aided channel estimator for OFDM systems

Author

Zhou, Zhigang ; Zhang, Xiaodong ; Bu, Zhiyong

Author_Institution

Shanghai Res. Center for Wireless Commun., China

Volume

1

fYear

2005

fDate

23-26 Sept. 2005

Firstpage

257

Lastpage

260

Abstract

An improved channel estimator with maximum-delay-spread measurement for OFDM systems is proposed by exploiting the inherent correlation between the cyclic prefix and port of the received OFDM signal. This scheme make use of real time measured size of inter-symbol interference (ISI) free window to estimate the maximum delay spread of channel, then a transform domain channel estimator is adopted to further reduce the noise variance. Due to the ISI-free window can be estimated before the application of FFT to the received signal, it is a parallel processing, and very suitable for the practical systems. Simulation result demonstrated that the proposed method can track the variation of delay spread of wireless channel, and improve the MSE of channel estimation significantly.

Keywords

OFDM modulation; channel estimation; fast Fourier transforms; interference suppression; intersymbol interference; mean square error methods; wireless channels; FFT; MSE; OFDM systems; cyclic prefix; domain channel estimator transform; fast Fourier transforms; intersymbol interference free window; maximum-delay-spread aided channel estimator; noise variance reduction; parallel processing; wireless channel; Channel estimation; Delay effects; Delay estimation; Intersymbol interference; Noise measurement; Noise reduction; OFDM; Parallel processing; Signal processing; Size measurement;

fLanguage

English

Publisher

ieee

Conference_Titel

Wireless Communications, Networking and Mobile Computing, 2005. Proceedings. 2005 International Conference on

Print_ISBN

0-7803-9335-X

Type

conf

DOI

10.1109/WCNM.2005.1544025

Filename

1544025