On the Impact of PA-Induced In-Band Distortion in Massive MIMO
2014 (English)In: Proceedings of European Wireless 2014, Berlin, Offenbach, Germany: VDE Verlag GmbH, 2014, 201-206 p.Conference paper (Refereed)
Conventional downlink signals in massive MIMO suffer from high PAR, which requires the power amplifiers of the base station to be backed off to avoid signal distortion, which lowers power efficiency. To improve efficiency, there are precoding schemes that produce signals with low PAR. To compare different precoding schemes, this article estimates their power consumptions through simulations, in which in-band distortion and amplifier efficiency effects are taken into consideration. It is found that, when only in-band distortion and the data rate requirement determine the back-off, the inband distortion is negligible and the power amplifiers can be operated at peak efficiency. It also turns out that low-PAR and conventional, high-PAR, precoding schemes consume approximately the same amount of power when the out-of-band part of the distortion is disregarded.
Place, publisher, year, edition, pages
Berlin, Offenbach, Germany: VDE Verlag GmbH, 2014. 201-206 p.
massive MIMO; multiuser precoding, crest-factor reduction, low-PAR precoding
massiv MIMO, fleranvändarförkodning, toppvärdesreducering, lågtoppvärdesförkodning
IdentifiersURN: urn:nbn:se:liu:diva-112395ISBN: 978-3-8007-3621-8OAI: oai:DiVA.org:liu-112395DiVA: diva2:765917
20th European Wireless Conference, 14-16 May 2014, Barcelona, Spain