Title :
An adaptive two-dimensional channel estimator for wireless OFDM with application to mobile DVB-T
Author :
Sanzi, Frieder ; Speidel, Joachim
Author_Institution :
Inst. of Telecommun., Stuttgart Univ., Germany
fDate :
6/1/2000 12:00:00 AM
Abstract :
An adaptive channel estimator is proposed and investigated to improve the performance of the receiver for pilot aided wireless and mobile OFDM systems. The estimator consists of a two-dimensional Wiener filter which is implemented as a cascade of two one-dimensional filters. We propose an efficient algorithm for adaptation to time varying channels of the second filter. The method is applied to the Terrestrial Digital Video Broadcasting System (DVB-T), which was originally specified for fixed receivers and which is in the process of being extended for mobile reception. The results are shown after inner decoding. Depending on the channel conditions, the signal-to-noise ratio gain can be up to 1.6 dB. The method provides a compatible improvement to DVB-T receivers
Keywords :
OFDM modulation; Wiener filters; adaptive estimation; adaptive filters; adaptive signal processing; digital video broadcasting; filtering theory; land mobile radio; multipath channels; parameter estimation; television receivers; time-varying channels; two-dimensional digital filters; DVB-T; DVB-T receivers; adaptive filtering; adaptive two-dimensional channel estimator; channel conditions; inner decoding; mobile DVB-T; mobile reception; multipath channel; one-dimensional filters; pilot aided mobile OFDM systems; pilot aided wireless systems; receiver performance; signal-to-noise ratio gain; terrestrial digital video broadcasting system; time varying channels; two-dimensional Wiener filter; wireless OFDM; Adaptive filters; Channel estimation; DSL; Delay estimation; Digital video broadcasting; Filtering; Frequency estimation; OFDM; Sampling methods; Wiener filter;
Journal_Title :
Broadcasting, IEEE Transactions on
