NDLI: Time-Domain LMMSE Channel Estimator Based on Sliding Window for OFDM Systems in High-Mobility Situations

Content Provider	IEEE Xplore Digital Library
Author	Kalakech, A. Berbineau, M. Dayoub, I. Simon, E.P.
Copyright Year	1967
Abstract	Recently, wideband orthogonal frequency-division multiplexing (OFDM)-based systems such as Long-Term Evolution (LTE) have been proposed for future railway communication systems. In such high-speed situations, Doppler phenomena, related to the terminal's high speed, affects the use of OFDM systems by producing a loss of orthogonality between different carriers. Thus, the channel estimation and equalization become a challenging problem, particularly when the number of pilot carriers is limited. This paper investigates the use of time-domain channel estimation for OFDM systems in high-speed scenarios and for a sparse pilot distribution. A time-domain linear minimum mean square error (TD-LMMSE) filter is designed for channel estimation. The TD-LMMSE emulates the effect of a sliding window and takes into consideration the interference caused by the data field. The expression of the MSE of linear estimators is also developed. Furthermore, a simple technique for the estimation of the second-order channel statistics is proposed. Simulation results, showing a significant gain in terms of MSE and bit error rate, compared with other state-of-the-art algorithms, are reported over a wide signal-to-noise ratio (SNR) range.
Sponsorship	IEEE Vehicular Technology Society
Starting Page	5728
Ending Page	5740
Page Count	13
File Size	1733745
File Format	PDF
ISSN	00189545
Volume Number	64
Issue Number	12
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Channel estimation OFDM Mean square error methods Time-domain analysis Frequency-domain analysis Time-varying channels timevarying channels channel estimation LMMSE filter time-varying channels linear minimum mean square error (LMMSE) filter orthogonal frequency-division multiplexing (OFDM)
Content Type	Text
Resource Type	Article
Subject	Applied Mathematics Automotive Engineering Computer Networks and Communications Electrical and Electronic Engineering Aerospace Engineering

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