Pilot Aided Channel Estimation for OFDM: A Separated Approach for Smoothing and Interpolation
2005 (English)In: Proceedings of the 40th IEEE International Conference on Commununications (ICC), 2005, 2173-2178 p.Conference paper (Refereed)
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.
Engineering and Technology
IdentifiersURN: urn:nbn:se:liu:diva-67041DOI: 10.1109/ICC.2005.1494722ISBN: 0-7803-8938-7OAI: oai:DiVA.org:liu-67041DiVA: diva2:406302
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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.