PHY1: Emerging Aspects on Propagation for Wireless Applications

Tuesday, 16 June 2020, 12:15-14:30 CEST, Recommended re-viewing,

Tuesday, 16 June 2020, 12:15-17:00 CEST, Non-Live interaction (Chat),  link sent only to Registered people


A Model for Off-Body Propagation Channels in Indoor Scenarios at mmWaves

Kryštof Zeman (Brno University of Technology, Czech Republic); Kenan Turbic (INESC-ID / IST, University of Lisbon, Portugal); Jiri Hosek (Brno University of Technology, Czech Republic); Luis M. Correia (IST/INESC-ID – University of Lisbon & INESC, Portugal)
This paper presents an off-body indoor propagation channel model. The model is based on a Friis transmission equation to which it adds the orientation-dependent body shadowing loss by adopting a basic model derived from cosine function. Furthermore, the developed propagation model accounts for human body dynamics and different material reflections coefficients, both implemented using random variables with uniform distribution. Created model was evaluated against a set of measurements conducted in the indoor environment at mmWave frequency (60 GHz) gathered from the literature, showing a good fit. The difference between the slopes of the proposed model and measurement is less than 6%.


Measurements and Ray Tracing Simulations: Impact of Different Antenna Positions on Meeting Room Coverage at 60 GHz

Muhammad Usman Sheikh, Kalle Ruttik, Riku Jäntti and Jyri Hämäläinen (Aalto University, Finland)
We consider the indoor signal propagation at mmWave frequency in an office environment. While channel measurements are widely used to give insights on the propagation phenomena, the use of measurements for the wireless system performance evaluation is limited. In contrary, carefully executed Ray Tracing (RT) simulations represent easier and more flexible option, but careful validation of simulation methodology is needed. The target of this paper is to highlight the use of an in-house built RT tool at 60 GHz, and show the effectiveness of simulations in predicting different characteristics of the channel by validating the simulation results against measurements. The acquired results highlight the impact of type and position of the transmit antenna on the path loss and spatial angular impulse response of the channel in a typical meeting room scenario. In first configuration, the antenna is placed in the middle of the table, while in second configuration the transmit antenna is located in the corner of the meeting room. We have studied the channel characteristics with respect to two Receiver (Rx) antenna orientations i.e., Direct Orientation (DO) and the Best Indirect Orientation (BIO). In first configuration, the observed RMS error between the measured and the simulated Path Loss (PL) is around 2.6 dB and 2.9 dB in case of DO and BIO, respectively. The acquired simulated results also indicate few discrepancies in the measurement results in case of second configuration. Delay spread of first configuration was found smaller compared to the second configuration.


Effect of Plastering Mesh on Radio Signals: Modelling and Practical Measurements

Ari Asp and Jussa Pikkuvirta (Tampere University, Finland); Arto Hujanen (VTT Technical Research Centre of Finland, Finland); Ismo Huhtinen (VTT, Finland); Mikko Valkama (Tampere University, Finland)
The improvement of the energy efficiency of a building is often one of the reasons for the renovation of building facades. During such renovations, the energy efficiency is usually improved by increasing the thickness of insulation layer. The increased insulation layer increases the overall thickness of the wall, and to compensate for that, a new thin facade material is often sought. As a result, plastering has gained more and more popularity recently. However, especially in the case of thick plastering, a plaster mesh is often used to fix a layer of material, and this paper investigates the effect of the mesh on radio signal attenuation. This study shows that the plastering mesh significantly increases the overall wall attenuation, especially at lower frequencies used by mobile
networks. The attenuation caused by the mesh is frequency dependent and decreases with increasing frequency. The attenuation behavior is entirely determined by the mesh size of themesh.


A Low-Overhead Hierarchical Beam-tracking Algorithm for THz Wireless Systems

Giorgos Stratidakis (University of Piraeus, Greece); Georgia D. Ntouni (Intracom Telecom, Greece); Alexandros-Apostolos A Boulogeorgos (University of Piraeus, Greece); Dimitrios S. Kritharidis (Intracom Telecom, Greece); Angeliki Alexiou (University of Piraeus, Greece)
In this paper, a novel hierarchical beam-tracking approach, which is suitable for terahertz (THz) wireless systems, is presented. The main idea is to employ a prediction based algorithm with a multi-resolution codebook, in order to decrease the required overhead of tracking and increase its robustness. The efficiency of the algorithm is evaluated in terms of the average number of pilots and mean square error (MSE) and is compared with the corresponding performance of the fast channel tracking (FCT) algorithm. Our results highlight the superiority of the proposed approach in comparison with FCT, in terms of tracking efficiency with low overhead.


A Comparison of Stochastic and Deterministic Channel Models for V2V Applications

Nils Dreyer (TU Braunschweig, Germany); Thomas Kürner (Technische Universität Braunschweig, Germany)
Channel models are widely applied in research to develop V2V applications. Such models lay a foundation for gaining knowledge about application performance and help to evaluate algorithms. While deterministic channel models aim to represent the environment as realistically as possible to compute the Channel Impulse Response (CIR), stochastic channel models based on measurement campaigns offer a computational inexpensive and generic way to randomly create realistic channel impulse responses. This paper compares the deterministic channel model MobPred optimized for Vehicle-to-Vehicle (V2V) applications with the stochastic channel model Quadriga that is applicable to V2V communication. CIRs were created for three different scenarios and evaluated inside a link level simulator to examine the Packet-Error-Rate (PER) which is an important KPI for many V2V applications. The results can be used to weigh which channel model type is suitable for which certain simulation scenario.


D-band Point to Multi-Point Deployment with G-Band Transport

Claudio Paoloni (Lancaster University, United Kingdom (Great Britain)); Viktor Krozer (Goethe University of Frankfurt am Main, Germany); François Magne (WHEN-AB & SARL, France); Quang Trung Le (HF Systems Engineering GmbH & Co. KG, Germany); Rupa Basu, Jeevan Rao and Rosa Letizia (Lancaster University, United Kingdom (Great Britain)); Ernesto Limiti (University of Rome Tor Vergata, Italy); Marc Marilier (OMMIC, France); Giacomo Ulisse (Johann Wolfgang Goethe-Universität, Germany); Antonio Ramirez (Fibernova Systems, Spain); Borja Vidal (Universidad Politecnica de Valencia, Spain); Hadi Yacob (9 Ferdinand-Braun-Institut, Leibniz-Institut für Höchstfrequenztechnik, Germany)
The first Point to MultiPoint wireless system at D-band has been designed and it is in advanced development. The European Commission H2020 ULTRAWAVE “Ultra capacity wireless layer beyond 100 GHz based on millimeter wave Traveling Wave Tubes” project aims to respond to the demand of high capacity at level of tens of Gigabit per second, in urban areas, where fiber backhaul is not economical viable and high density small cell architectures are deployed. A transmission hub powered by novel D-band TWT will feed a number of terminals arbitrary allocated in the corresponding area sector. ULTRAWAVE project includes This paper illustrates the main characteristics, advantages and networking aspects and provide a summary of the latest results of the ULTRAWAVE project.