Analysis of pilot decontamination based on power control

Cottatellucci, Laura; Müller, Ralf R; Vehkaperä, Mikko
VTC 2013-Spring, IEEE 77th Vehicular Technology Conference, 2-5 June 2013, Dresden, Germany

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.


DOI
Type:
Conférence
City:
Dresden
Date:
2013-06-02
Department:
Systèmes de Communication
Eurecom Ref:
3982
Copyright:
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