Improving Accuracy of Ray-Tracing Prediction in Non Line-of-Sight (NLOS) Urban Street Cell Environment beyond 6GHz

2017 ◽  
Vol E100.B (4) ◽  
pp. 566-574
Author(s):  
Nobutaka OMAKI ◽  
Tetsuro IMAI ◽  
Koshiro KITAO ◽  
Yukihiko OKUMURA
Keyword(s):  
Ray Tracing ◽  
Line Of Sight ◽  
Urban Street ◽  
Improving Accuracy ◽  
Non Line Of Sight

Optimization BLE Power Beacon for Indoor Locations Static Smart Device with Gaussian Filter

2021 ◽  
Vol 11 (1) ◽  
pp. 23
Author(s):  
Fanda Lyta Suzanayanti ◽  
Mudrik Alaydrus
Keyword(s):  
Power Optimization ◽  
Distance Estimation ◽  
Line Of Sight ◽  
Smart Device ◽  
Gaussian Filter ◽  
Additional Method ◽  
Transmit Power ◽  
Indoor Location ◽  
Improving Accuracy ◽  
Non Line Of Sight

BLE beacon in an indoor location, battery efficiency usage must be right. Power beacons as one of the keys that need to be optimized. The decrease in power beacons will decrease the estimated distance from an indoor location based on the RSSI value. Therefore, an additional method is needed to recover the estimated distance's accuracy value due to the reduced power. In this paper, the method for recovery accuracy is by using a gaussian filter. Measurements were made at the same position on 3 BLE signals from multipower transmitters, which differed in their transmit power (TX power -1 dBm, -9 dBm and -20 dBm). The first six points are selected with the position of the line of sight as environment 1, and the second six points are chosen with the position of non-line of sight as environment 2 (obstructed). The first point of each environment is used as a reference. In environment 1, transmit power reduces the 24 dB effect to a decrease in accuracy distance estimation. The Gaussian effectiveness filter for improvement accuracy at all measurement points or 100%. In environment 2, reduce power transmit 12 dB is not followed by a decrease in accuracy distance estimation. The effectiveness of the Gaussian filter for improving accuracy is 60% of the number of measurement points. Finally, the Gaussian filter in the power optimization can provide recovery accuracy distance estimation is 80% from measurement sample for environment 1 and environment 2.

scholarly journals Measurements and Ray Tracing Simulations for Non-Line-of-Sight Millimeter-Wave Channels in a Confined Corridor Environment

IEEE Access ◽  
2019 ◽  
Vol 7 ◽  
pp. 85066-85081 ◽  
Author(s):  
Guangrong Yue ◽  
Daizhong Yu ◽  
Hao Qiu ◽  
Ke Guan ◽  
Lin Yang ◽  
...  
Keyword(s):  
Ray Tracing ◽  
Millimeter Wave ◽  
Line Of Sight ◽  
Non Line Of Sight

scholarly journals A Ray-Tracing Technique to Characterize GPS Multipath in the Frequency Domain

2015 ◽  
Vol 2015 ◽  
pp. 1-16 ◽  
Author(s):  
Naveen S. Gowdayyanadoddi ◽  
James T. Curran ◽  
Ali Broumandan ◽  
Gérard Lachapelle
Keyword(s):  
Frequency Domain ◽  
Ray Tracing ◽  
Multipath Propagation ◽  
Doppler Frequency ◽  
Real Data ◽  
Frequency Difference ◽  
Line Of Sight ◽  
Gps Measurements ◽  
Sources Of Error ◽  
Non Line Of Sight

Multipath propagation is one of the major sources of error in GPS measurements. In this research, a ray-tracing technique is proposed to study the frequency domain characteristics of multipath propagation. The Doppler frequency difference, also known as multipath phase rate and fading frequency, between direct (line-of-sight, LOS) and reflected (non-line-of-sight, NLOS) signals is studied as a function of satellite elevation and azimuth, as well as distance between the reflector and the static receiver. The accuracy of the method is verified with measured Doppler differences from real data collected in a downtown environment. The use of ray-tracing derived predicted Doppler differences in a receiver, as a means of alleviating the multipath induced errors in the measurement, is presented and discussed.

Time-resolved non-sequential ray-tracing modelling of non-line-of-sight picosecond pulse LIDAR

2016 ◽  
Author(s):  
Adam Sroka ◽  
Susan Chan ◽  
Ryan Warburton ◽  
Genevieve Gariepy ◽  
Robert Henderson ◽  
...  
Keyword(s):  
Ray Tracing ◽  
Picosecond Pulse ◽  
Line Of Sight ◽  
Time Resolved ◽  
Non Line Of Sight

Integrating the Non-Line of Sight Launching System (NLOS-LS) in the United States Navy

2007 ◽  
Author(s):  
Jonathon Emis ◽  
Bryan Huang ◽  
Timothy Jones ◽  
Mei Li ◽  
Don Tumbocon
Keyword(s):  
United States ◽  
United States Navy ◽  
The United States ◽  
Line Of Sight ◽  
Non Line Of Sight

scholarly journals Channel Impulse Response at 60 GHz and Impact of Electrical Parameters Properties on Ray Tracing Validations

Electronics ◽  
2021 ◽  
Vol 10 (4) ◽  
pp. 393
Author(s):  
Huthaifa Obeidat ◽  
Atta Ullah ◽  
Ali AlAbdullah ◽  
Waqas Manan ◽  
Omar Obeidat ◽  
...  
Keyword(s):  
Electrical Properties ◽  
Ray Tracing ◽  
Impulse Response ◽  
Line Of Sight ◽  
Indoor Propagation ◽  
60 Ghz ◽  
Environment Design ◽  
Electrical Parameters ◽  
Concrete Walls ◽  
Properties Of Materials

This paper outlines a study of the effect of changing the electrical properties of materials when applied in the Wireless InSite (WI) ray-tracing software. The study was performed at 60 GHz in an indoor propagation environment and supported by Line of Sight (LoS) and Non-LoS measurements data. The study also investigates other factors that may affect the WI sensitivity, including antenna dimensions, antenna pattern, and accuracy of the environment design. In the experiment, single and double reflections from concrete walls and wooden doors are analysed. Experimental results were compared to those obtained from simulation using the WI. It was found that materials selected from the literature should be similar to those of the environment under study in order to have accurate results. WI was found to have an acceptable performance provided certain conditions are met.

scholarly journals Low-cost SPAD sensing for non-line-of-sight tracking, material classification and depth imaging

2021 ◽  
Vol 40 (4) ◽  
pp. 1-12
Author(s):  
Clara Callenberg ◽  
Zheng Shi ◽  
Felix Heide ◽  
Matthias B. Hullin
Keyword(s):  
Low Cost ◽  
Line Of Sight ◽  
Depth Imaging ◽  
Material Classification ◽  
Non Line Of Sight
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