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Energy consumption in multi-user MIMO systems: Impact of user mobility
KTH, School of Electrical Engineering (EES), Signal Processing. KTH, School of Electrical Engineering (EES), Centres, ACCESS Linnaeus Centre. Alcatel-Lucent, Ecole Supérieure d'Électricité (Supélec), Gif-sur-Yvette, France .
2014 (English)In: ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings, 2014, 4743-4747 p.Conference paper, Published paper (Refereed)
Abstract [en]

In this work, we consider the downlink of a single-cell multi-user multiple-input multiple-output system in which zero-forcing precoding is used at the base station (BS) to serve a certain number of user equipments (UEs). A fixed data rate is guaranteed at each UE. The UEs move around in the cell according to a Brownian motion, thus the path losses change over time and the energy consumption fluctuates accordingly. We aim at determining the distribution of the energy consumption. To this end, we analyze the asymptotic regime where the number of antennas at the BS and the number of UEs grow large with a given ratio. It turns out that the energy consumption is asymptotically a Gaussian random variable whose mean and variance are derived analytically. These results can, for example, be used to approximate the probability that a battery-powered BS runs out of energy within a certain time period.

Place, publisher, year, edition, pages
2014. 4743-4747 p.
Keyword [en]
Energy utilization, Signal processing, Telecommunication links
National Category
Signal Processing
Identifiers
URN: urn:nbn:se:kth:diva-168537DOI: 10.1109/ICASSP.2014.6854502Scopus ID: 2-s2.0-84905216589OAI: oai:DiVA.org:kth-168537DiVA: diva2:818070
Conference
2014 IEEE International Conference on Acoustics, Speech, and Signal Processing, ICASSP 2014; Florence; Italy
Note

QC 20150608

Available from: 2015-06-08 Created: 2015-06-04 Last updated: 2015-06-08Bibliographically approved

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