Page 14 - ITU Journal: Volume 2, No. 1 - Special issue - Propagation modelling for advanced future radio systems - Challenges for a congested radio spectrum

ITU Journal: ICT Discoveries, Vol. 2(1), December 2019

Sub-THz channel characterization from ray-based deterministic simulations

Pages 17-25

Grégory Gougeon, Yoann Corre, Mohammed Zahid Aslam
Future wireless communication systems will require large network capacities beyond the capabilities of present
and upcoming 5G technology. The trend of considering higher frequencies for their large bandwidths continues
today into the sub-THz domain. The frequencies that are considered in this article are the ones investigated in
the BRAVE beyond-5G project, i.e. in the 90-200 GHz spectrum. A ray-based deterministic tool is extended
to those frequencies, which are then exploited to simulate and characterize the propagation channel properties
in two different scenarios: 1) in-office and 2) in-street. A particular interest is brought to the path loss and
delay spread statistics. The impact of the antenna beam width is also considered. Using deterministic
simulations (even if not yet validated in the target spectrum but at lower frequencies) is a very convenient way
to explore the sub-THz propagation characteristics, while channel measurements are only very few at those
frequencies. Some very simple models have been derived that may contribute to the elaboration and evaluation
of future sub-THz systems.

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IRACON propagation measurements and channel models for 5G and beyond

Pages 27-35

Sana Salous, Fredrik Tufvesson, Kenan Turbic, Luis M. Correia, Thomas Kürner, Diego Dupleich, Christian
Schneider, Daniel Czaniera, Belen Montenegro Villacieros

Several frequency bands and system architectures are proposed for 5G and beyond to meet the higher data
rates for point-to-point communication and point-to-area coverage. In this paper, we present radio propagation
studies and models developed in typical scenarios for massive antenna deployment and body area networks,
in frequency bands below 6 GHz, building entry loss and clutter loss and vehicular communication, in the
millimeter wave bands, and models in the Terahertz for 5G and beyond.
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Directional antenna channel modelling in urban area using ray tracing

Pages 37-44

Zhuyin Li, Sithamparanathan Kandeepan, Andrea Giorgetti, Akram Al-Hourani, Kagiso Magowe
Directional antennas are regarded as one of the key technologies to achieve higher signal quality and data rate.
Evidence has shown that the directional antenna channel features can be very different from the
omnidirectional ones. Therefore, it is essential to characterize the directional antenna channel model (DACM),
since an accurate, easy-to-implement DACM plays a vital role in the wireless network design, optimization
and utilization. In this paper, we cluster the incident rays based on the azimuth direction of arrival at the
receiver and extract the features concerning the number of clusters, the distribution of the cluster center and
the cluster power ratio. The proposed DACM is derived by the ray tracing method and is feasible for a typical
urban scenario within a range of a few hundred meters. Moreover, our proposed model is verified by both ray
tracing and numerical simulations. In this paper, we present the model derivation methodology, recommend
the model parameters and offer an implementation guideline.
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