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Optimizing multi-cell massive MIMO for spectral efficiency: How Many users should be scheduled?
KTH, School of Electrical Engineering (EES), Signal Processing.
KTH, School of Electrical Engineering (EES), Signal Processing.
2014 (English)In: 2014 IEEE Global Conference on Signal and Information Processing, GlobalSIP 2014, IEEE conference proceedings, 2014, 612-616 p.Conference paper (Refereed)
Abstract [en]

Massive MIMO is a promising technique to increase the spectral efficiency of cellular networks, by deploying antenna arrays with hundreds or thousands of active elements at the base stations and performing coherent beamforming. A common rule-of-thumb is that these systems should have an order of magnitude more antennas, N, than scheduled users, K, because the users' channels are then likely to be quasi-orthogonal. However, it has not been proved that this rule-of-thumb actually maximizes the spectral efficiency. In this paper, we analyze how the optimal number of scheduled users, K, depends on N and other system parameters. The value of K in the large-N regime is derived in closed form, while simulations are used to show what happens at finite N, in different interference scenarios, and for different beamforming.

Place, publisher, year, edition, pages
IEEE conference proceedings, 2014. 612-616 p.
Keyword [en]
Massive MIMO, Pilot contamination, User scheduling, Antenna arrays, Antennas, Beamforming, Cellular arrays, Efficiency, Information science, Mobile security, Active elements, Cellular network, Coherent beamforming, Optimal number, Pilot contaminations, Rule of thumb, Spectral efficiencies, Beam forming networks
National Category
Telecommunications
Identifiers
URN: urn:nbn:se:kth:diva-174815DOI: 10.1109/GlobalSIP.2014.7032190ScopusID: 2-s2.0-84936155215ISBN: 9781479970889OAI: oai:DiVA.org:kth-174815DiVA: diva2:881340
Conference
2014 IEEE Global Conference on Signal and Information Processing, GlobalSIP 2014, 3 December 2014 through 5 December 2014
Note

QC 20151210

Available from: 2015-12-10 Created: 2015-10-07 Last updated: 2015-12-10Bibliographically approved

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