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Grenoble Images Parole Signal Automatique |
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Grenoble Images Parole Signal Automatique |
| HAL: hal-00660684, version 1 |
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| IEEE Transactions on Signal Processing 60, 2 (2012) 754-765 |
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| Joint Carrier Frequency Offset and Channel Estimation for OFDM Systems via the EM Algorithm in the Presence of Very High Mobility |
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| Eric Pierre Simon 1Laurent Ros 2 |
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| (2012-02) |
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| In this paper, the problem of joint carrier frequency offset (CFO) and channel estimation for OFDM systems over the fast time-varying frequency-selective channel is explored within the framework of the expectation-maximization (EM) algorithm and parametric channel model. Assuming that the path delays are known, a novel iterative pilot-aided algorithm for joint estimation of the multipath Rayleigh channel complex gains (CG) and the carrier frequency offset (CFO) is introduced. Each CG time-variation, within one OFDM symbol, is approximated by a basis expansion model (BEM) representation. An autoregressive (AR) model is built to statistically characterize the variations of the BEM coefficients across the OFDM blocks. In addition to the algorithm, the derivation of the hybrid Cramér-Rao bound (HCRB) for CFO and CGs estimation in our context of very high mobility is provided. We show that the proposed EM has a lower computational complexity than the optimum maximum a posteriori estimator and yet incurs only an insignificant loss in performance. |
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| 1: | Institut d'électronique, de microélectronique et de nanotechnologie (IEMN) |
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CNRS : UMR8520 – Institut supérieur de l'électronique et du nunérique (ISEN) – Université Lille I - Sciences et technologies – Université de Valenciennes et du Hainaut-Cambresis |
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| 2: | Grenoble Images Parole Signal Automatique (GIPSA-lab) |
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CNRS : UMR5216 – Université Joseph Fourier - Grenoble I – Université Pierre-Mendès-France - Grenoble II – Université Stendhal - Grenoble III – Institut Polytechnique de Grenoble - Grenoble Institute of Technology |
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| 3: | Lebanese International University (LIU) |
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Lebanese International University |
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| 4: | International University of Rabat |
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| 5: | University of Leeds |
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University of Leeds |
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| Subject | : | Engineering Sciences/Signal and Image processing Computer Science/Signal and Image Processing |
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| Channel estimation – OFDM – time-varying channels. |
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| Attached file list to this document: | |||||
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| hal-00660684, version 1 | |
| http://hal.archives-ouvertes.fr/hal-00660684 | |
| oai:hal.archives-ouvertes.fr:hal-00660684 | |
| From: Laurent Ros | |
| Submitted on: Tuesday, 17 January 2012 13:46:12 | |
| Updated on: Tuesday, 17 January 2012 13:56:31 | |
