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Pilot Aided Channel Estimation for OFDM: A Separated Approach for Smoothing and Interpolation
DoCoMo Euro-Labs.
Technical University of Crete, Chania, Greece.
2005 (English)In: Proceedings of the 40th IEEE International Conference on Commununications (ICC), 2005, 2173-2178 p.Conference paper (Refereed)
Abstract [en]

In this paper pilot aided channel estimation (PACE) for OFDM is addressed. For PACE equidistantly spaced pilot symbols allow to reconstruct the channel response by means of interpolation. The optimum minimum mean squared error (MMSE) estimator performs smoothing and interpolation jointly. To reduce the complexity of the optimum MMSE estimator, we propose to separate the smoothing and interpolation tasks. The separated smoothing and interpolation estimator (SINE) consistsof a MMSE based smoother which only operates at the received pilot symbols, and an interpolator which is independent of the channel statistics. We show that the separated approach gets close to the optimum MMSE, while the complexity is grossly reduced. However, at high SNR an error floor is observed, which is caused by edge effects, i.e. subcarriers near the beginning and end of the band suffer from an increased interpolation error.

Place, publisher, year, edition, pages
2005. 2173-2178 p.
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-67041DOI: 10.1109/ICC.2005.1494722ISBN: 0-7803-8938-7OAI: oai:DiVA.org:liu-67041DiVA: diva2:406302
Note
©2005 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE. Gunther Auer and Eleftherios Karipidis, Pilot Aided Channel Estimation for OFDM: A Separated Approach for Smoothing and Interpolation, 2005, Proceedings of the 40th IEEE International Conference on Commununications (ICC), 2173-2178. http://dx.doi.org/10.1109/ICC.2005.1494722 Available from: 2011-03-25 Created: 2011-03-25 Last updated: 2011-04-06

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