IEEE Journal of Selected Topics in Signal Processing ( Vol.8, N°5, October 2014
We propose a nonlinear channel estimation method based on a subspace projection that is suitable for asymmetric antenna array systems. We show that the so-called pilot contamination problem reported in [1], is an artefact of (inappropriate) linear channel estimation and does not occur in cellular systems with power-controlled handoff when the channel estimation method proposed in this paper is used. We intuitively explain our
result by establishing an isomorphism between a massive MIMO system and a spread-spectrum system with unknown signature sequences.
Type:
Journal
City:
Stuttgart
Date:
2013-03-13
Department:
Systèmes de Communication
Eurecom Ref:
3905
Copyright:
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