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Kalman interpolation filter for channel estimation of LTE downlink in high-mobility environments

Dai, X; Zhang, W; Xu, J; Mitchell, JE; Yang, Y; (2012) Kalman interpolation filter for channel estimation of LTE downlink in high-mobility environments. EURASIP Journal on Wireless Communications and Networking , 2012 (232) 10.1186/1687-1499-2012-232. Green open access

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Abstract

The estimation of fast-fading LTE downlink channels in high-speed applications of LTE advanced is investigated in this article. In order to adequately track the fast time-varying channel response, an adaptive channel estimation and interpolation algorithm is essential. In this article, the multi-path fast-fading channel is modelled as a tapped-delay, discrete, finite impulse response filter, and the time-correlation of the channel taps is modelled as an autoregressive (AR) process. Using this AR time-correlation, we develop an extended Kalman filter to jointly estimate the complex-valued channel frequency response and the AR parameters from the transmission of known pilot symbols. Furthermore, the channel estimates at the known pilot symbols are interpolated to the unknown data symbols by using the estimated time-correlation. This article integrates both channel estimation at pilot symbols and interpolation at data symbol into the proposed Kalman interpolation filter. The bit error rate performance of our new channel estimation scheme is demonstrated via simulation examples for LTE and fast-fading channels in high-speed applications.

Type: Article
Title: Kalman interpolation filter for channel estimation of LTE downlink in high-mobility environments
Open access status: An open access version is available from UCL Discovery
DOI: 10.1186/1687-1499-2012-232
Publisher version: http://jwcn.eurasipjournals.com/
Language: English
Additional information: © 2012 Dai et al.; licensee Springer. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng
URI: http://discovery.ucl.ac.uk/id/eprint/1370649
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