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Massive MIMO From a Terminal Perspective

Bengtsson, Erik L LU (2019)
Abstract
This thesis focuses on the terminal aspects of massive MIMO systems. Based on the degree of freedom a terminal have in a MaMi, different antenna configurations, transceiver topologies with associated transmission schemes, and the underlying algorithms are researched.

The first studied topic concerns multiple-antenna terminals in a massive MIMO system for sub-6 GHz, operated at the center frequency of 3.7 GHz. Simulation environments based on fully-stochastic as well as geometric-stochastic approaches are developed and the results are compared to measured.
For the measurements the Lund University Massive MIMO (LuMaMi) testbed has been used. To enable evaluation of multi-antenna terminals, modifications to the LuMaMi framework... (More)
This thesis focuses on the terminal aspects of massive MIMO systems. Based on the degree of freedom a terminal have in a MaMi, different antenna configurations, transceiver topologies with associated transmission schemes, and the underlying algorithms are researched.

The first studied topic concerns multiple-antenna terminals in a massive MIMO system for sub-6 GHz, operated at the center frequency of 3.7 GHz. Simulation environments based on fully-stochastic as well as geometric-stochastic approaches are developed and the results are compared to measured.
For the measurements the Lund University Massive MIMO (LuMaMi) testbed has been used. To enable evaluation of multi-antenna terminals, modifications to the LuMaMi framework have been necessary. Real-time diversity schemes for dual antenna terminals as well as a channel capturing feature have been implemented. The latter, to enable analysis and post processing of measured channels from the multi-antenna terminals.

Multi-antenna terminal prototypes with integrated antennas, based on real Sony Xperia smartphone chassis where designed for the evaluation. The three-dimensional antenna gain-patterns have been characterized in an anechoic chamber to ensure that simulations and measurements have a common ground.

The second topic in this thesis relates to mm-wave massive MIMO systems. As a first step toward evaluation of handsets, a 28 GHz channel sounder has been developed for the measurement of dynamic, highly resolved, in both temporal and spatial domains, propagation channels. To enable measurements, a 256$\times$128 antenna-element system was designed together with a control program to handle the switching and the enormous amount of data.
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author
supervisor
opponent
  • Professor Ekman, Nils Torbjörn, Norwegian University of Science and Technology, Norway
organization
publishing date
type
Thesis
publication status
published
subject
keywords
Massive MIMO, mm-wave, terminal antenna, channel sounding, Propagation Channel, sub 6 GHz
edition
1
pages
274 pages
publisher
Department of Electrical and Information Technology, Lund University
defense location
Lecture Hall E:1406, E-Building, Ole Römers väg 3, Lund University, Faculty of Engineering LTH, Lund
defense date
2019-09-27 09:00
ISBN
978-91-7895-253-3
978-91-7895-254-0
language
English
LU publication?
yes
id
0eba1466-65a9-451f-bb8d-fd829c30a81e
date added to LUP
2019-08-12 12:29:26
date last changed
2019-09-05 13:43:47
@phdthesis{0eba1466-65a9-451f-bb8d-fd829c30a81e,
  abstract     = {This thesis focuses on the terminal aspects of massive MIMO systems. Based on the degree of freedom a terminal have in a MaMi, different antenna configurations, transceiver topologies with associated transmission schemes, and the underlying algorithms are researched.<br/><br/>The first studied topic concerns multiple-antenna terminals in a massive MIMO system for sub-6 GHz, operated at the center frequency of 3.7 GHz. Simulation environments based on fully-stochastic as well as geometric-stochastic approaches are developed and the results are compared to measured. <br/>For the measurements the Lund University Massive MIMO (LuMaMi) testbed has been used. To enable evaluation of multi-antenna terminals, modifications to the LuMaMi framework have been necessary. Real-time diversity schemes for dual antenna terminals as well as a channel capturing feature have been implemented. The latter, to enable analysis and post processing of measured channels from the multi-antenna terminals. <br/><br/>Multi-antenna terminal prototypes with integrated antennas, based on real Sony Xperia smartphone chassis where designed for the evaluation. The three-dimensional antenna gain-patterns have been characterized in an anechoic chamber to ensure that simulations and measurements have a common ground. <br/><br/>The second topic in this thesis relates to mm-wave massive MIMO systems. As a first step toward evaluation of handsets, a 28 GHz channel sounder has been developed for the measurement of dynamic, highly resolved, in both temporal and spatial domains, propagation channels. To enable measurements, a 256$\times$128 antenna-element system was designed together with a control program to handle the switching and the enormous amount of data.<br/>},
  author       = {Bengtsson, Erik L},
  isbn         = {978-91-7895-253-3},
  keyword      = {Massive MIMO,mm-wave,terminal antenna,channel sounding,Propagation Channel,sub 6 GHz},
  language     = {eng},
  month        = {09},
  pages        = {274},
  publisher    = {Department of Electrical and Information Technology, Lund University},
  school       = {Lund University},
  title        = {Massive MIMO From a Terminal Perspective},
  year         = {2019},
}