Analysis of Pilot Decontamination Based on Power Control

Author

Cottatellucci, Laura ; Muller, Rafael Rios ; Vehkapera, Mikko

Author_Institution

Mobile Commun. Dept., EURECOM, Sophia Antipolis, France

fYear

2013

fDate

2-5 June 2013

Firstpage

1

Lastpage

5

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

antenna arrays; channel estimation; interference suppression; mobility management (mobile radio); nonlinear estimation; perturbation theory; power control; probability; source separation; asymmetric antenna array systems; channel estimation linearity; free probability; interference subspace; nonlinear channel estimation method; perturbation theory; pilot contamination problem; power controlled handoff; signal separation; subspace method; subspace separability; transmission conditions; Arrays; Channel estimation; Contamination; Eigenvalues and eigenfunctions; Interference; MIMO; Receiving antennas;

fLanguage

English

Publisher

ieee

Conference_Titel

Vehicular Technology Conference (VTC Spring), 2013 IEEE 77th

Conference_Location

Dresden

ISSN

1550-2252

Type

conf

DOI

10.1109/VTCSpring.2013.6691891

Filename

6691891