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Journal Articles Signal Processing Year : 2014

Complex Amplitudes Tracking Loop for multipath channel estimation in OFDM systems over slow to moderate fading

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Abstract

This paper deals with multipath channel estimation for Orthogonal Frequency-Division Multiplexing systems under slow to moderate fading conditions. Most of the conventionalmethods exploit only the frequency-domain correlation by estimating the channel at pilot frequencies, and then interpolating the channel frequency response. More advanced algorithms exploit in addition the time-domain correlation, by employing Kalman filters based on the approximation of the time-varying channel. Adopting a parametric approach and assuming a primary acquisition of the path delays, channel estimators have to track the complex amplitudes of the paths. In this perspective, we propose a less complex algorithm than the Kalman methods, inspired by second-order Phase-Locked Loops. An error signal is created from the pilot-aided Least-Squares estimates of the complex amplitudes, and is integrated by the loop to carry out the final estimates. We derive closed-form expressions of the mean squared error of the algorithm and of the optimal loop coefficients versus the channel state, assuming a Rayleigh channel with Jakes'Doppler spectrum. The efficiency of our reduced complexity algorithm is demonstrated, with an asymptotic mean squared error lower than the first-order auto-regressive Kalman filters reported in the literature, and almost the same as a second-order Kalman-based algorithm.
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Dates and versions

hal-00916576 , version 1 (10-12-2013)

Identifiers

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Laurent Ros, Hussein Hijazi, Eric Pierre Simon. Complex Amplitudes Tracking Loop for multipath channel estimation in OFDM systems over slow to moderate fading. Signal Processing, 2014, 97 (April), pp.134-145. ⟨10.1016/j.sigpro.2013.10.014⟩. ⟨hal-00916576⟩
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