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Time-domain LMMSE channel estimator based on sliding window for OFDM systems in high-mobility situations

Ali Kalakech 1 Marion Berbineau 1 Iyad Dayoub 2, 3 Eric Simon 4, 2
3 COMNUM - IEMN - COMmunications NUMériques - IEMN
IEMN-DOAE - Institut d’Électronique, de Microélectronique et de Nanotechnologie - Département Opto-Acousto-Électronique - UMR 8520
4 IEMN-TELICE - Télécommunication, Interférences et Compatibilité Electromagnétique
IEMN - Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520
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.
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https://hal.archives-ouvertes.fr/hal-03383658
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Submitted on : Monday, October 18, 2021 - 4:15:14 PM
Last modification on : Monday, January 17, 2022 - 5:28:05 PM

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Ali Kalakech, Marion Berbineau, Iyad Dayoub, Eric Simon. Time-domain LMMSE channel estimator based on sliding window for OFDM systems in high-mobility situations. IEEE Transactions on Vehicular Technology, Institute of Electrical and Electronics Engineers, 2015, 64 (12), pp.5728-5740. ⟨10.1109/TVT.2014.2387255⟩. ⟨hal-03383658⟩

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