scholarly journals Measurements and calibration method for WLAN indoor path loss modelling

2005 ◽  
Author(s):  
R. Tahri
Keyword(s):  
Path Loss ◽  
Calibration Method ◽  
Loss Modelling

scholarly journals Automated Calibration of RSS Fingerprinting Based Systems Using a Mobile Robot and Machine Learning

Sensors ◽  
2021 ◽  
Vol 21 (18) ◽  
pp. 6270
Author(s):  
Marcin Kolakowski
Keyword(s):  
Neural Network ◽  
Machine Learning ◽  
Path Loss ◽  
Gaussian Process Regression ◽  
Calibration Method ◽  
Positioning Systems ◽  
Training Models ◽  
System Environment ◽  
Automated Method ◽  
Median Error

This paper describes an automated method for the calibration of RSS-fingerprinting-based positioning systems. The method assumes using a robotic platform to gather fingerprints in the system environment and using them for training machine learning models. The obtained models are used for positioning purposes during the system operation. The presented calibration method covers all steps of the system calibration, from mapping the system environment using a GraphSLAM based algorithm to training models for radio map calibration. The study analyses four different models: fitting a log-distance path loss model, Gaussian Process Regression, Artificial Neural Network and Random Forest Regression. The proposed method was tested in a BLE-based indoor localisation system set up in a fully furnished apartment. The results have shown that the tested models allow for localisation with accuracy comparable to those reported in the literature. In the case of the Neural Network regression, the median error of robot positioning was 0.87 m. The median of trajectory error in a walking person localisation scenario was 0.4 m

scholarly journals 60 GHz Path Loss Modelling Inside Ships

2020 ◽  
Author(s):  
Brecht De Beelde ◽  
Emmeric Tanghe ◽  
Marwan Yusuf ◽  
David Plets ◽  
Eli De Poorter ◽  
...  
Keyword(s):  
Path Loss ◽  
60 Ghz ◽  
Loss Modelling

scholarly journals Path-loss modelling for WSN deployment in indoor and outdoor environments for medical applications

2018 ◽  
Vol 7 (3) ◽  
pp. 1666 ◽  
Author(s):  
Ahmed Bashar Fakhri ◽  
Sadik Kamel Gharghan ◽  
Saleem Latteef Mohammed
Keyword(s):  
Standard Deviation ◽  
Multipath Propagation ◽  
Path Loss ◽  
Medical Application ◽  
Indoor Environments ◽  
Data Packets ◽  
And Performance ◽  
Log Normal ◽  
Loss Modelling ◽  
Indoor And Outdoor Environments

Wireless sensor networks (WSNs) and their applications have received significantly interested in the last few years. In WSN, knowing an accurate path-loss model as well as packet delivery should be taken into account for the successful distribution of several nodes in the net-work. This paper presents a path-loss modeling and performance evaluation of the ZigBee wireless standard. Received signal strength indi-cator (RSSI) measurements were achieved in outdoor and indoor environments to derive the path-loss based on Log-Normal Shadowing Model (LNSM). The path-loss parameters such as standard deviation and path loss exponents were estimated over point-to-point ZigBee WSN. In addition, the variances of received RSSI values and standard deviation for these values have been investigated. Furthermore, the data packets received is measured practically. Results revealed that the LNSM can be estimated to reflect the channel losses in both outdoor and indoor environments for medical application. The data delivery was achieved successfully of 100% in outdoor which better than indoor due to multipath propagation and shadowing. Moreover, the data packets delivery of the current work outperformed previous work.  

scholarly journals An Approach for Self-Adaptive Path Loss Modelling for Positioning in Underground Environments

2016 ◽  
Vol 2016 ◽  
pp. 1-8
Author(s):  
Evgeny Osipov ◽  
Denis Kleyko ◽  
Alexey Shapin
Keyword(s):  
Real Time ◽  
Path Loss ◽  
Signal Strength ◽  
Communication Technologies ◽  
Underground Mines ◽  
Radio Communication ◽  
Proposed Model ◽  
Loss Modelling ◽  
Model Features ◽  
Self Adaptive

This paper proposes a real-time self-adaptive approach for accurate path loss estimation in underground mines or tunnels based on signal strength measurements from heterogeneous radio communication technologies. The proposed model features simplicity of implementation. The methodology is validated in simulations and verified by measurements taken in real environments. The proposed method leverages accuracy of positioning matching the existing approaches while requiring smaller engineering efforts.

AN INVESTIGATION ON THE USE OF ITU-R P.1411-7 IN 802.11N PATH LOSS MODELLING

2014 ◽  
Vol 50 ◽  
pp. 91-98 ◽  
Author(s):  
Thiagarajah Siva Priya ◽  
Shamini Pillay Narayanasamy Pillay ◽  
Manogaran Saargunawathy ◽  
Dinesh Madhavan
Keyword(s):  
Path Loss ◽  
Loss Modelling

scholarly journals Electromagnetic Insights Into Path Loss Modelling of IRS-Assisted SISO Links: Method-Of-Moment Based Analysis

2021 ◽  
Vol 2 ◽  
Author(s):  
Debdeep Sarkar ◽  
Yahia Antar
Keyword(s):  
Mutual Coupling ◽  
Asymptotic Methods ◽  
Spherical Wave ◽  
Path Loss ◽  
Method Of Moment ◽  
Rectangular Array ◽  
Unit Cells ◽  
Circuit Components ◽  
Loss Modelling ◽  
Speed Accuracy

In this paper, we demonstrate the usefulness of MoM (Method-of-Moments) based methods in efficient path-loss modelling for SISO (single-input single-output) communication links assisted by IRS (Intelligent Reflecting Surfaces). Being a full-wave computational electromagnetic tool, MoM is better equipped compared to high-frequency asymptotic methods like PO (Physical Optics), to handle the crucial electromagnetic (EM) effects like: mutual coupling between IRS unit-cells or interactions with spherical wave-front in antenna near-field. Furthermore, in terms of computational speed, accuracy and reproducibility, the MoM-based MATLAB Antenna Toolbox is significantly advantageous to emulate IRS-assisted wireless channels, as compared to the in-house FDTD (finite-difference time-domain) techniques. We consider a SISO system of two half-wavelength dipoles, and use a rectangular array of circular loops loaded with lumped circuit components as IRS. The lumped circuit loading enables us to control the reactance of individual unit-cells, resulting in alteration of IRS reflection coefficient and consequent changes in channel characteristics. Using numerous numerical simulations, we highlight the impacts of various IRS-parameters like: electrical size and number of unit-cells, distance of IRS from the transmitter/receiver as well as mutual coupling, on the path-loss models (both sub-6 GHz and mm-wave).

scholarly journals Propagation Path Loss Modelling in Container Terminal Environment

10.5772/14583 ◽  
2011 ◽  
Author(s):  
Slawomir J. ◽  
Ryszard J. ◽  
Jaroslaw Sadowski ◽  
Jacek Stefanski
Keyword(s):  
Container Terminal ◽  
Path Loss ◽  
Propagation Path ◽  
Loss Modelling
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