Pilot-symbol-aided channel estimation for OFDM in wireless systems

Author

Li, Ye Geoffrey

Author_Institution

AT&T Labs., Red Bank, NJ, USA

Volume

2

fYear

1999

fDate

36342

Firstpage

1131

Abstract

We investigate pilot-symbol-aided parameter estimation for OFDM systems. We first derive a minimum mean-square error pilot-symbol-aided parameter estimator. Then, we discuss a robust implementation of the pilot-symbol-aided estimator that is insensitive to channel statistics. From the simulation results, the required SNRs for a 10% word error rate (WER) are 6.8 dB and 7.3 dB for the typical urban channels with 40 Hz and 200 Hz Doppler frequencies, respectively, and are 8 dB and 8.3 dB for the hilly-terrain channels with 40 Hz and 200 Hz Doppler frequencies, respectively. Compared with the decision-directed parameter estimator, the pilot-symbol-aided estimator is highly robust to Doppler frequency for dispersive fading channels with noise impairment even though it has some performance degradation for systems with lower Doppler frequencies

Keywords

Doppler effect; OFDM modulation; dispersive channels; diversity reception; error statistics; fading channels; fast Fourier transforms; inverse problems; least mean squares methods; parameter estimation; 200 Hz; 40 Hz; Doppler frequencies; FFT; OFDM; SNR; antenna diversity; channel statistics; decision-directed parameter estimator; dispersive fading channels; hilly-terrain channels; minimum mean-square error; noise impairment; pilot-symbol-aided channel estimation; pilot-symbol-aided estimator; urban channels; wireless systems; word error rate; Channel estimation; Degradation; Dispersion; Error analysis; Fading; Frequency estimation; Noise robustness; OFDM; Parameter estimation; Statistics;

fLanguage

English

Publisher

ieee

Conference_Titel

Vehicular Technology Conference, 1999 IEEE 49th

Conference_Location

Houston, TX

ISSN

1090-3038

Print_ISBN

0-7803-5565-2

Type

conf

DOI

10.1109/VETEC.1999.780524

Filename

780524