scholarly journals Transfer Learning-Based Received Power Prediction with Ray-tracing Simulation and Small Amount of Measurement Data

2020 ◽  
Author(s):  
Masahiro Iwasaki ◽  
Takayuki Nishio ◽  
Masahiro Morikura ◽  
Koji Yamamoto
Keyword(s):  
Ray Tracing ◽  
Transfer Learning ◽  
Measurement Data ◽  
Power Prediction ◽  
Received Power ◽  
Ray Tracing Simulation

Transfer Learning-Based Received Power Prediction Using RGB-D Camera in mmWave Networks

2019 ◽  
Author(s):  
Tomoya Mikuma ◽  
Takayuki Nishio ◽  
Masahiro Morikura ◽  
Koji Yamamoto ◽  
Yusuke Asai ◽  
...  
Keyword(s):  
Transfer Learning ◽  
Power Prediction ◽  
Received Power

scholarly journals Indoor Millimeter-Wave Propagation Prediction by Measurement and Ray Tracing Simulation at 38 GHz

Symmetry ◽  
2018 ◽  
Vol 10 (10) ◽  
pp. 464 ◽  
Author(s):  
Ferdous Hossain ◽  
Tan Geok ◽  
Tharek Rahman ◽  
Mhd Hindia ◽  
Kaharudin Dimyati ◽  
...  
Keyword(s):  
Ray Tracing ◽  
Millimeter Wave ◽  
Three Dimensional ◽  
Measurement Data ◽  
Path Loss ◽  
Actual Measurement ◽  
Measurement Output ◽  
Sbr Method ◽  
Propagation Prediction ◽  
Ray Tracing Simulation

The Millimeter-Wave (mmW) technology is going to mitigate the global higher bandwidth carriers. It will dominate the future network system by the attractive advantages of the higher frequency band. Higher frequency offers a wider bandwidth spectrum. Therefore, its utilizations are rapidly increasing in the wireless communication system. In this paper, an indoor mmW propagation prediction is presented at 38 GHz based on measurements and the proposed Three-Dimensional (3-D) Ray Tracing (RT) simulation. Moreover, an additional simulation performed using 3-D Shooting Bouncing Ray (SBR) method is presented. Simulation using existing SBR and the proposed RT methods have been performed separately on a specific layout where the measurement campaign is conducted. The RT methods simulations results have been verified by comparing with actual measurement data. There is a significant agreement between the simulation and measurement with respect to path loss and received signal strength indication. The analysis result shows that the proposed RT method output has better agreement with measurement output when compared to the SBR method. According to the result of the propagation prediction analysis, it can be stated that the proposed method’s ray tracing is capable of predicting the mmW propagation based on a raw sketch of the real environment.

scholarly journals Mean receiver power prediction for indoors 802.11 WLANS using the ray tracing technique

2007 ◽  
Vol 5 (01) ◽  
Author(s):  
J. Sánchez ◽  
C. Castro ◽  
L. Villaseñor
Keyword(s):  
Ray Tracing ◽  
Electromagnetic Waves ◽  
Wireless Local Area Network ◽  
Local Area Network ◽  
Local Area ◽  
Area Network ◽  
Power Prediction ◽  
Received Power ◽  
Tracing Algorithm ◽  
5 Ghz

A technique for the modeling of wireless channels, namely the image ray tracing algorithm, is developed in this work to predict the local mean received power of a wireless local area network (WLAN) based on the 802.11a standard operating in the 5 GHz band. This technique has been enhanced in order to account for the propagation of the electromagnetic waves thru a wireless environment, including the absorption and reflection phenomenon at obstacles. The image ray tracing algorithm is used to calculate all the possible propagation paths between a radio transmitter and a receiver. The simulation results of the mean received power strength are compared against field measurements to validate the convenience of the simulation approach.

scholarly journals Investigation of SARS-CoV-2 inactivation using UV-C LEDs in public environments via ray-tracing simulation

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Po-Yen Lai ◽  
Huizhe Liu ◽  
Ray Jia Hong Ng ◽  
Bianca Wint Hnin Thet ◽  
Hong-Son Chu ◽  
...  
Keyword(s):  
Public Space ◽  
Ray Tracing ◽  
High Reliability ◽  
Measurement Data ◽  
Efficient Design ◽  
Software Simulation ◽  
3D Environments ◽  
Operating Space ◽  
Ray Tracing Simulation ◽  
Uv C

AbstractThis paper proposes an investigating SARS-CoV-2 inactivation on surfaces with UV-C LED irradiation using our in-house-developed ray-tracing simulator. The results are benchmarked with experiments and Zemax OpticStudio commercial software simulation to demonstrate our simulator's easy accessibility and high reliability. The tool can input the radiant profile of the flexible LED source and accurately yield the irradiance distribution emitted from an LED-based system in 3D environments. The UV-C operating space can be divided into the safe, buffer, and germicidal zones for setting up a UV-C LED system. Based on the published measurement data, the level of SARS-CoV-2 inactivation has been defined as a function of UV-C irradiation. A realistic case of public space, i.e., a food court in Singapore, has been numerically investigated to demonstrate the relative impact of environmental UV-C attenuation on the SARS-CoV-2 inactivation. We optimise a specific UV-C LED germicidal system and its corresponding exposure time according to the simulation results. These ray-tracing-based simulations provide a useful guideline for safe deployment and efficient design for germicidal UV-C LED technology.

scholarly journals Investigating Intense Rainfall Influence on Distance Measurement with a Time-of-Flight Camera Sensor Using Optical Ray-Tracing Simulation Technique

Proceedings ◽  
2018 ◽  
Vol 2 (13) ◽  
pp. 1056
Author(s):  
Marcus Baumgart ◽  
Norbert Druml ◽  
Markus Dielacher ◽  
Cristina Consani
Keyword(s):  
Ray Tracing ◽  
Time Of Flight ◽  
Autonomous Driving ◽  
Intense Rainfall ◽  
Signal Suppression ◽  
Tof Camera ◽  
Ray Tracing Simulation ◽  
Camera Sensors ◽  
Optical Ray Tracing ◽  
Rain Effect

Robust, fast and reliable examination of the surroundings is essential for further advancements in autonomous driving and robotics. Time-of-Flight (ToF) camera sensors are a key technology to measure surrounding objects and their distances on a pixel basis in real-time. Environmental effects, like rain in front of the sensor, can influence the distance accuracy of the sensor. Here we use an optical ray-tracing based procedure to examine the rain effect on the ToF image. Simulation results are presented for experimental rain droplet distributions, characteristic of intense rainfall at rates of 25 mm/h and 100 mm/h. The ray-tracing based simulation data and results serve as an input for developing and testing rain signal suppression strategies.

scholarly journals Simple and Exact Closed-Form Expression for Determination of a Penetrated Ray Path in a Ray Tracing

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Hyun Wook Moon ◽  
Woojoong Kim ◽  
Sewoong Kwon ◽  
Jaeheung Kim ◽  
Young Joong Yoon
Keyword(s):  
Closed Form ◽  
Approximate Method ◽  
Ray Tracing ◽  
Conventional Method ◽  
Closed Form Expression ◽  
Indoor Environments ◽  
Straight Line ◽  
Ray Path ◽  
Ray Tracing Simulation

A simple and exact closed-form equation to determine a penetrated ray path in a ray tracing is proposed for an accurate channel prediction in indoor environments. Whereas the penetrated ray path in a conventional ray tracing is treated as a straight line without refraction, the proposed method is able to consider refraction through the wall in the penetrated ray path. Hence, it improves the accuracy in ray tracing simulation. To verify the validation of the proposed method, the simulated results of conventional method, approximate method, and proposed method are compared with the measured results. The comparison shows that the proposed method is in better agreement with the measured results than the conventional method and approximate method, especially in high frequency bands.

Analysis of Multipath Propagation in Urban Environment Through Multidimensional Measurements and Advanced Ray Tracing Simulation

2008 ◽  
Vol 56 (3) ◽  
pp. 848-857 ◽  
Author(s):  
Franco Fuschini ◽  
Hassan El-Sallabi ◽  
Vittorio Degli-Esposti ◽  
Lasse Vuokko ◽  
Doriana Guiducci ◽  
...  
Keyword(s):  
Urban Environment ◽  
Ray Tracing ◽  
Multipath Propagation ◽  
Ray Tracing Simulation

scholarly journals Analysis of Propagation Characteristics for Various Subway Tunnel Scenarios at 28 GHz

2021 ◽  
Vol 2021 ◽  
pp. 1-16
Author(s):  
Chengjian Wang ◽  
Wenli Ji ◽  
Guoxin Zheng ◽  
Asad Saleem
Keyword(s):  
Ray Tracing ◽  
Root Mean Square ◽  
Millimeter Wave ◽  
Measurement Data ◽  
Path Loss ◽  
Small Scale ◽  
Delay Spread ◽  
Mean Square ◽  
Propagation Characteristics ◽  
Subway Tunnels

In order to meet the higher data transmission rate requirements of subway communication services, the millimeter wave (mmWave) broadband communication is considered as a potential solution in 5G technology. Based on the channel measurement data in subway tunnels, this paper uses ray-tracing (RT) simulation to predict the propagation characteristics of the 28 GHz millimeter wave frequency band in different tunnel scenarios. A large number of simulations based on ray-tracing software have been carried out for tunnel models with different bending radiuses and different slopes, and we further compared the simulation results with the real time measurement data of various subway tunnels. The large-scale and small-scale propagation characteristics of the channel, such as path loss (PL), root mean square delay spread (RMS-DS), and angle spread (AS), for different tunnel scenarios are analyzed, and it was found that the tunnel with a greater slope causes larger path loss and root mean square delay spread. Furthermore, in the curved tunnel, the angle spread of the azimuth angle is larger than that in a straight tunnel. The proposed results can provide a reference for the design of future 5G communication systems in subway tunnels.

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