Application of moving window FDTD to prediction of path loss over irregular terrain

2004 ◽  
Author(s):  
R. Luebbers ◽  
J. Schuster ◽  
K. Wu
Keyword(s):  
Path Loss ◽  
Moving Window ◽  
Irregular Terrain

Hardware in the Loop Simulation for Low-Altitude UAV Link in the Complex Terrain

2013 ◽  
Vol 336-338 ◽  
pp. 1907-1912
Author(s):  
Yi Zheng ◽  
Yu Wen Wang
Keyword(s):  
Real Time ◽  
Complex Terrain ◽  
Video Transmission ◽  
Physical Simulation ◽  
Path Loss ◽  
Video Stream ◽  
Communication Link ◽  
Hardware In The Loop ◽  
The Real ◽  
Irregular Terrain

In order to investigate the influence of complex terrain on the quality of the unmanned aerial vehicle (UAV) communication link and simulate it accurately, the HITL simulation platform of the UAV-ground link, which was based on EXata software and Hardware-in-the-loop (HITL) module, was built. In the virtual terrain scenarios, the Free-space loss model and the Irregular Terrain Model (ITM) were used to modeling and conduct the semi-physical simulation experiments, respectively. Then, a new method of the HITL simulation for the wireless communication link was put forward, which achieved the real-time video stream interaction with the virtual networks. The simulation results showed the real-time changes of path loss in the complex terrain and the specific affection on the UAV-ground link communication quality from numerical and video transmission effect. The method enhanced the accuracy and rationality of the UAV-ground link simulation.

scholarly journals Assessment and Modeling of GSM Signal Propagation in Uyo, Nigeria

2017 ◽  
Vol 2 (11) ◽  
pp. 49 ◽  
Author(s):  
Sunny Orike ◽  
Promise Elechi ◽  
Iboro Asuquo Ekanem
Keyword(s):  
Field Strength ◽  
Path Loss ◽  
Signal Propagation ◽  
Empirical Models ◽  
Propagation Model ◽  
Link Quality ◽  
Base Stations ◽  
Quality Factors ◽  
Irregular Terrain

High quality of service is a paramount concern in wireless networks. One of the strategies in achieving optimal performance is to use wireless empirical models to predict wireless link quality factors such as path loss and the received power in any given transmission domain with irregular terrain. The primary goal of this study is to develop a radio wave propagation model for Uyo metropolis. An assessment was carried out in three major roads within the city of Uyo in Akwa Ibom State, to determine the quality of GSM signal reception by measuring the signal field strength, magnetic field strength, and power density of the base transceiver stations. The measurements were carried out using radio frequency electromagnetic field strength meter over a distance of 2000 meters from the base stations. The results of the measurements were analysed and a path loss model was developed for Uyo using linear regression model. Three empirical models: Okumura-Hata model, COST-Hata model, and Egli model were also applied in predicting the path loss in Uyo and the results obtained were compared with the developed model for Uyo metropolis. The comparison showed that Route D model had a better comparison factor with the developed model while the Okumura-Hata and COST-Hata were almost the same with more loss as the distance increased. In all the measurements, the standard deviation was between 3.31 dB and 3.36 dB.

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