A nonlinear channel estimation method based on a subspace projection is proposed. It is suitable for strongly asymmetric antenna array systems. It is shown that the so-called pilot contamination problem is an artefact of linear channel estimation. It can be overcome in cellular systems with power- controlled handoff if the channel estimation method proposed in this paper is used. An intuitive explanation for this finding is established by means of an isomorphism between a massive MIMO system and a spread-spectrum system with unknown signature sequences. The proposed method of channel estimation is based on a spectral decomposition of the matrix of received signal vectors collected over one coherence interval. It is analyzed by means of random matrix and free probability theory.
Blind pilot decontamination
IEEE Journal of Selected Topics in Signal Processing, March 2014 / Also on ArXiv
Type:
Journal
Date:
2014-03-05
Department:
Systèmes de Communication
Eurecom Ref:
4142
Copyright:
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See also:
PERMALINK : https://www.eurecom.fr/publication/4142
