@inproceedings{182e58b3746a49c4b745ef48de39a169,
title = "Analysis of pilot decontamination based on power control",
abstract = "A subspace method for channel estimation is proposed for asymmetric antenna array systems. The so-called pilot contamination problem reported in [1] is found to be due to the linearity of channel estimation in [2]. We show that it does not occur in cellular systems with power control and power-controlled handoff when the nonlinear channel estimation method proposed in this paper is used. Power-control hand-off is needed to guarantee separability between signal and interference subspaces. We derive the transmission conditions for subspace separability based on free probability and perturbation theory.",
keywords = "Channel estimation, Massive MIMO, Multiple antennas, Multiple-input multiple-output (MIMO) systems, Principal component analysis, Spread-spectrum",
author = "Laura Cottatellucci and M{\"u}ller, {Ralf R.} and Mikko Vehkaper{\"a}",
year = "2013",
month = dec,
day = "1",
doi = "10.1109/VTCSpring.2013.6691891",
language = "English",
series = "IEEE Vehicular Technology Conference",
publisher = "IEEE Institute of Electrical and Electronic Engineers",
booktitle = "IEEE 77th Vehicular Technology Conference, VTC Spring",
note = "2013 IEEE 77th Vehicular Technology Conference, VTC Spring 2013 ; Conference date: 02-06-2013 Through 05-06-2013",
}