Ph.D. defence by Johannes Hejselbæk


07.12.2018 kl. 12.30 - 16.00


‘Radio propagation for the next generation mobile communication system’

The mobile communication industry is moving towards the fifth generation mobile communication system (5G). This talk presents contributions, from the submitted thesis to the understanding of what is expected to be the radio propagation channel for this next generation mobile communication system.

The main focus of the work presented is on the collected propagation data for the future 5G radio channel, investigations of the user impact on mm-wave channels and a study on device-to-device communication in a forest environment. The presentation will include a discussion on the importance of the different findings from the performed empirical studies. Further, it will try to clarify on the future use of these findings.  

A further description of the thesis, which forms the basis for this defence, is presented in the following:

The thesis includes a description of the development of a channel sounding system capable of characterizing the propagation channel at both the legacy and newly proposed frequencies for 5G.

By applying the developed sounding system it is possible to highlight some of the differences and similarities between the two frequency bands. The sounding system is also used to validate different channel sounding techniques by empirical studies.

A study of the user impact on the mm-wave channel is also a part of this thesis. The study is conducted utilizing a state-of-the-art channel sounder together with a mock-up handset including a linear array operating at 21.5 GHz. Using the measurement setup, an indoor radio channel is investigated both with and without a user holding the handset. This is done to identify the direct impact of the user and the feasibility of adopting beamforming from the handset.

Finally, the thesis presents the development of a measurement system and a measurement campaign aiming at characterizing the propagation channel for device-to-device narrow-band internet-of-things type communication. The measurement campaign, conducted in a forest, is utilized as a basis for comparing the performance of different suggested models including both path-loss and foliage-loss.

Assessment Committee
Associate Professor Jan Hvolgaard Mikkelsen, Aalborg University, Denmark (Chairman)
Professor Rodney Grant Vaughan, Simon Fraser University
Associate Professor Andrés Alayón Glazunov, University of Twente

Professor Gert Frølund Pedersen, Aalborg University, Denmark
Associate Professor Wei Fan, Aalborg University, Denmark

Associate Professor Jimmy Jessen Nielsen, Aalborg University

After the defence there will be a reception in the  canteen next to the auditorium
Please feel free to join


Free of Charge


The Antennas, Propagation and Millimetre-wave Systems (APMS) Department of Electronic Systems


The auditorium – Novi 8, Niels Jernes Vej 27

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