Dimensioning of PA for massive MIMO system with load adaptive number of antennas
2014 (English)In: Globecom Workshops (GC Wkshps), 2014, 2014, 1102-1108 p.Conference paper (Refereed)
This paper takes into consideration the non-ideal efficiency characteristics of realistic power amplifiers (PAs) along with the daily traffic profile in order to investigate the impact of power amplifier dimensioning on the energy efficiency of load adaptive massive MIMO system. A multicellular system has been considered where each base station (BS) is equipped with large number of antennas to serve many single antenna users. For a given number of users in a cell, the optimum number of active antennas maximizing energy efficiency (EE) has been derived where total BS downlink power is assumed to be fixed. Under the same assumption, the power amplifiers have been dimensioned in a way that maximize network energy efficiency not only for a for a single time snapshot but over twenty four hours of operation while considering dynamic efficiency characteristics of the PAs. In order to incorporate this daily load profile, each BS has been modeled as an M/G/c/c state dependent queue under the assumption that the network is dimensioned to serve a maximum number of users at a time corresponding to 100% cell traffic load. This load adaptive system along with the optimized PA dimensioning achieves 30% higher energy efficinecy compared to a base line system where the BSs always run with a fixed number of active antennas which are most energy efficient while serving 100% traffic load.
Place, publisher, year, edition, pages
2014. 1102-1108 p.
Electrical Engineering, Electronic Engineering, Information Engineering
IdentifiersURN: urn:nbn:se:kth:diva-155168DOI: 10.1109/GLOCOMW.2014.7063580ScopusID: 2-s2.0-84946693441ISBN: 978-1-4799-7470-2OAI: oai:DiVA.org:kth-155168DiVA: diva2:759923
Globecom 2014 - 2nd Workshop on Green Broadband access: energy efficient wireless and wired network solutions
ProjectsWireless@KTH5GrEEn-Towards Green 5G Mobile Networks
QC 201504162014-11-012014-11-012015-04-16Bibliographically approved