A Preliminary Study on Uncertainty of NB-IoT Measurements in Reverberation Chambers

A. Hubrechsen, Vincent T. Neylon, Kate A. Remley, Robert D. Jones, Robert D. Horansky, L.A. (Sander) Bronckers

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

1 Citation (Scopus)


New protocols related to internet-of-things applications may introduce previously unnoticed measurement effects due to the narrowband nature of these protocols. Such technologies also require less loading to meet the coherence bandwidth conditions, which may lead to higher variations accross the channel. This can cause a need to take additional components into account in the assessment of uncertainty. In this work, we present a preliminary study on uncertainties of NB-IoT measurements in reverberation chambers. We show a need to account for both the number of mode-stirring samples and the lack of spatial uniformity in the uncertainty analysis, where the latter generally dominates for wireless testing. We provide preliminary results for the uncertainty including both effects. We introduce a hypothesis for the effects of loading on the uncertainty, introducing that there may be an optimal loading point to minimize uncertainty, where we describe that this decision may not depend only on coherence bandwidth, but also on the number of significant modes.
Original languageEnglish
Title of host publication2020 50th European Microwave Conference, EuMC 2020
Place of PublicationUtrecht, Netherlands
Pages1051 - 1054
Number of pages4
ISBN (Electronic)978-2-87487-059-0
Publication statusPublished - 2 Feb 2021
EventEuropean Microwave Week 2020 - Jaarbeurs, Utrecht, Netherlands
Duration: 13 Sep 202018 Sep 2020


ConferenceEuropean Microwave Week 2020
Abbreviated titleEuMW2020
Internet address


  • CAT-M1
  • Cellular Telecommunications
  • Chamber transfer function
  • Internet of Things
  • Mode distribution
  • NB-IoT
  • Reverberation chamber
  • Uncertainty
  • Wireless System

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