WeD2- Propagation

Wednesday, 19 June 2019, 16:00-17:30, Room 2


Session Chair: Filipe Cardoso (IST/INOV INESC/ESTSetubal, Portugal)


Modeling and Link Budget Estimation of Directional mmWave Outdoor Environment for 5G

Sheeba Kumari M (VTU, Bangalore, India); Sudarshan Rao (BigSolv Labs Pvt Ltd Bangalore, India); Navin Kumar (Amrita University & School of Engineering, India)
Narrow pencil-beam forming is a key enabling technique for millimeter wave (mmWave) systems to achieve high link quality. Employing highly directional narrow beam antennas will deliver unique requirements on mmWave channel modeling. In this paper, we propose a low complexity mmWave channel model to analyze the performance of line of sight (LOS) and non-line of sight (NLOS) directional outdoor links in several reference cases. This ray tracing based model integrates the antenna geometry of a highly directional antenna in 3D plane. The effects of specific attenuation and foliage losses are also incorporated to enhance the model accuracy. Simulation results show that the deterministic channel fading gain varies as a function of antenna location, height and beamwidth in addition to its variations against distance. The model is validated against standard channel models and measurements, at frequencies and deployment scenarios reported in the literature. Furthermore, link budget estimates and signal-to-noise ratio (SNR) results are evaluated. The proposed model, unlike many state-of-the-art models, describes the channel for any mmWave frequency, antenna beamwidth, transmitter/receiver height and location by just changing these parameters in the simulator. The study highlights the need to integrate directional antenna effects and deployment parameters in the channel model to have accurate performance predictions.

Transmission Through Large Intelligent Surfaces: A New Frontier in Wireless Communications

Ertugrul Basar (Koc University, Turkey)
In this paper, transmission through large intelligent surfaces (LIS) that intentionally modify the phases of incident waves to improve the signal quality at the receiver, is put forward as a promising candidate for future wireless communication systems and standards. For the considered LIS-assisted system, a general mathematical framework is presented for the calculation of symbol error probability (SEP) by deriving the distribution of the received signal-to-noise ratio (SNR). Next, the new concept of using the LIS itself as an access point (AP) is proposed. Extensive computer simulation results are provided to assess the potential of LIS-based transmission, in which the LIS acts either as an intelligent reflector or an AP with or without the knowledge of channel phases. Our findings reveal that LIS-based communications can become a game-changing paradigm for future wireless systems.

The Effect of Rough Surface Statistics on Diffuse Scattering at Terahertz Frequencies

Mai Alissa (University Duisburg Essen, Germany); Theo Kreul (University of Duisburg-Essen, Germany); Thomas Kaiser (Universität Duisburg-Essen, Germany)
In Terahertz region, the diffuse scattering phenomenon by rough surfaces has a remarkable effect of non-line of sight (NLOS) channel propagation. Several parameters contribute to form a specific distribution of the scattered rays, and the angular distribution of the scattered field varies depending on the surface roughness parameters. Yet, a clear understanding of how these parameters adjust the scattered field distribution is still missing. In this work, we investigate the scattering properties of indoor materials at Terahertz band. This is done via full-wave simulation of the diffused scattering by rough samples varies in their roughness characteristics. Then, the role of each statistical parameter is investigated separately. It was proven that both the surface correlation function and the correlation length have an influence on the far field scattered energy. While the height standard deviation has a direct effect on the specular part, the correlation length seems to affect the power distribution out of the specular direction. The longer the correlation length, the more energy is accumulated closer to the specular direction. The resulting angular distribution can be then applied for obtaining more accurate NLOS channel predictions.

Multi-band Double-directional 5G Street Canyon Measurements in Germany

Diego Dupleich (Ilmenau University of Technology, Germany); Robert Müller and Sergii Skoblikov (TU Ilmenau, Germany); Jian Luo (Huawei Technologies Duesseldorf GmbH, Germany); Giovanni Del Galdo (Fraunhofer Institute for Integrated Circuits IIS & Technische Universität Ilmenau, Germany); Reiner S. Thomä (Ilmenau University of Technology, Germany)
In the present paper we introduce the results of simultaneous multi-band ultra-wideband measurements at 6.75, 30, and 60 GHz in a street canyon scenario under LOS in Germany. This is the first part of a street canyon measurements series using the same channel sounder in different parts of the world. The aim of these measurements is to analyse and compare the propagation characteristics with multi-band channel modelling in view. We show that from the propagation perspective, mm-waves offer very similar opportunities than the well known and exploited sub-6 GHz bands.

Millimeter Wave Antenna for Information Shower: Design Choices and Performance

Sergio Barberis, Daniele Disco and Roberto Vallauri (TIM, Italy); Takashi Tomura and Jiro Hirokawa (Tokyo Institute of Technology, Japan)
This paper describes the results of the investigations related to the design, and test of an array antenna prototype to be used in an information shower to be implemented at the gates of a stadium and enabling the fast download of huge amount of data by the people entering/going out. The antenna operates at mm-wave in order to provide an extremely high bit rate. The activity has been conducted within the 5G-MiEdge project, a joint EU-Japan research project that investigates the combined usage of mm-wave access and MEC (Multi-access Edge Computing) so as to enable very high speed and low latency communications in 5G.