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Ph.D. defence by Àlex Oliveras Martínez


09.03.2018 kl. 12.30 - 09.03.2018 kl. 16.00


Characterisation and Modelling of Measured Massive MIMO Channels

Massive MIMO is defined as a cellular system comprising a very large number of antennas at the base station serving multiple users in the same time-frequency resource. Theoretical studies attribute great benefits to this technology, for example high spectral efficiency, low probability of error and energy efficiency. However, the channel models used to study the performance of massive MIMO are over simplified and might not represent the reality.

This thesis presents the analysis of measured massive MIMO channels in order to better understand its characteristics and their impact into real implementations. The measurements used in this thesis are highly realistic. New deployment scenarios for the 5G are studied, similar to shopping malls and outdoor concert venues, both in LoS and NLoS. The measurements involve multiple dynamic users holding a two-antennas mockup handset and they are allowed to have their own handgrip.

The study of these measured channels brings insight on characteristics that can be exploited by signal processing techniques or they can be used to create better channel models. For example the degree of multi-user multiplexing that the channel offers, the orthogonality of the channel vectors of different users, the conditioning of the channel for two antennas in the same handset, etc. The thesis has a strong focus on the impact of the aperture of the array. Finally this thesis proposes some topics to modify in WINNER-type channel models to adapt them to massive MIMO channels.

Assessment Committee
Professor Andrew Nix, Bristol University, UK
Professor Kimmo Kansanen, Norwegian University of Science and Technology, Norway
Associate Professor Gilberto Berardinelli (Chairman), Aalborg University

Professor MSO Elisabeth De Carvalho, Aalborg University

Professor Petar Popovski, Aalborg University

Associate Professor Jimmy Jessen Nielsen, Aalborg University

After the defence a reception will take place at Fredrik Bajers Vej 7A/1-112 (just opposite the seminar room Fredrik Bajers Vej 7B/2-104). Please feel free to join


Free of charge


The Connectivity section (CNT), Department of Electronic Systems


Aalborg University, Frederik Bajers Vej 7B/2-104

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