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Optimal linear precoding in multi-user MIMO systems: A large system analysis
Dipartimento di Ingegneria dellInformazione, University of of PisaPisa, Italy; Alcatel-Lucent, Ecole Supérieure dÉlectricité (Supélec)Gif-sur-Yvette, France.
Linköping University, Department of Electrical Engineering, Communication Systems. Linköping University, The Institute of Technology. Alcatel-Lucent, Ecole Supérieure dÉlectricité (Supélec)Gif-sur-Yvette, France; Dept. of Signal Processing, KTH, Stockholm, Sweden.
Alcatel-Lucent, Ecole Supérieure dÉlectricité (Supélec)Gif-sur-Yvette, France.
Alcatel-Lucent, Ecole Supérieure dÉlectricité (Supélec)Gif-sur-Yvette, France; Department of Physics, National and Capodistrian University of of AthensAthens, Greece.
2014 (English)In: 2014 IEEE Global Communications Conference, GLOBECOM 2014, Institute of Electrical and Electronics Engineers Inc. , 2014, no 7037420, 3922-3927 p.Conference paper, Published paper (Refereed)
Abstract [en]

We consider the downlink of a single-cell multi-user MIMO system in which the base station makes use of N antennas to communicate with K single-antenna user equipments (UEs) randomly positioned in the coverage area. In particular, we focus on the problem of designing the optimal linear precoding for minimizing the total power consumption while satisfying a set of target signal-to-interference-plus-noise ratios (SINRs). To gain insights into the structure of the optimal solution and reduce the computational complexity for its evaluation, we analyze the asymptotic regime where N and K grow large with a given ratio and make use of recent results from large system analysis to compute the asymptotic solution. Then, we concentrate on the asymptotically design of heuristic linear precoding techniques. Interestingly, it turns out that the regularized zero-forcing (RZF) precoder is equivalent to the optimal one when the ratio between the SINR requirement and the average channel attenuation is the same for all UEs. If this condition does not hold true but only the same SINR constraint is imposed for all UEs, then the RZF can be modified to still achieve optimality if statistical information of the UE positions is available at the BS. Numerical results are used to evaluate the performance gap in the finite system regime and to make comparisons among the precoding techniques.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers Inc. , 2014. no 7037420, 3922-3927 p.
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:liu:diva-116760DOI: 10.1109/GLOCOM.2014.7037420Scopus ID: 2-s2.0-84924368078ISBN: 9781479935116 (print)OAI: oai:DiVA.org:liu-116760DiVA: diva2:801390
Conference
2014 IEEE Global Communications Conference, GLOBECOM 2014
Available from: 2015-04-09 Created: 2015-04-02 Last updated: 2015-04-09

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Björnson, Emil

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