NDLI: Low-complexity time-domain channel estimators for mobile wireless OFDM systems

Content Provider	IEEE Xplore Digital Library
Author	Werner, S. Enescu, M. Koivunen, V.
Copyright Year	2005
Description	Author affiliation: Lab. of Signal Process., Helsinki Univ. of Technol., Espoo, Finland (Werner, S.; Enescu, M.; Koivunen, V.)
Abstract	This paper proposes low-complexity time-domain channel estimators for OFDM systems. Time-domain channel estimation combined with frequency domain equalization is an attractive approach, since it can provide lower complexity and better estimator performance than pure frequency domain processing. In the particular case of constant modulus (M-PSK) modulation, we show that the transmission matrix is unitary. Therefore, the simple correlator channel estimator turns out to be optimal. For the case of non-constant envelope the transmission matrix is not unitary any more, but its corresponding correlation matrix is strongly diagonal. Therefore, a low-complexity approximate LS solution is proposed which avoids matrix inversion. A study of decision-feedback errors is performed, which suggest that iterative re-decoding of the data further improves the channel estimates. Simulations carried out for a wide range of mobile speeds demonstrate that the proposed estimators, using only 2% of pilot data, outperform recently proposed [T. Roman et al, 2003] time-and frequency-domain approaches.
Starting Page	245
Ending Page	250
File Size	327683
Page Count	6
File Format	PDF
ISBN	0780393333
ISSN	15206130
DOI	10.1109/SIPS.2005.1579873
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-11-02
Publisher Place	Greece
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Time domain analysis OFDM Frequency estimation Channel estimation Frequency domain analysis Bit error rate Intersymbol interference Estimation error Signal processing Laboratories
Content Type	Text
Resource Type	Article

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