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Journal Articles IET Communications Year : 2014

Third-order Complex Amplitudes Tracking Loop for Slow Flat Fading Channel On-Line Estimation

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Abstract

This paper deals with channel estimation in tracking mode over a flat Rayleigh fading channel with Jakes' Doppler Spectrum. Many estimation algorithms exploit the time-domain correlation of the channel by employing a Kalman filter based on a first-order (or sometimes second-order) approximation model of the time-varying channel. However, the nature of the approximation model itself degrades the estimation performance for slow to moderate varying channel scenarios. Furthermore, the Kalman-based algorithms exhibit a certain complexity. Hence, a different model and approach has been investigated in this work to tackle all of these issues. A novel PLL-structured third-order tracking loop estimator with a low complexity is proposed. The connection between a steady-state Kalman filter based on a random walk approximation model and the proposed estimator is first established. Then, a sub-optimal mean-squared-error (MSE) is given in a closed-form expression as a function of the tracking loop parameters. The parameters that minimize this sub-optimal MSE are also given in a closed-form expression. The asymptotic MSE and Bit-Error-Ratio (BER) simulation results demonstrate that the proposed estimator outperforms the first and second order Kalman-based filters reported in literature. The robustness of the proposed estimator is also verified by a mismatch simulation.
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Dates and versions

hal-00912410 , version 1 (02-12-2013)

Identifiers

Cite

Huaqiang Shu, Laurent Ros, Eric Pierre Simon. Third-order Complex Amplitudes Tracking Loop for Slow Flat Fading Channel On-Line Estimation. IET Communications, 2014, 8 (3), pp.360-371. ⟨10.1049/iet-com.2013.0316⟩. ⟨hal-00912410⟩
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