Utilization of Three-dimensional Spatial Maps in Access Point Placement Optimization

2020 ◽  
Author(s):  
A. Bayu Primawan
Keyword(s):  
Three Dimensional ◽  
Access Point ◽  
Placement Optimization ◽  
Point Placement ◽  
Spatial Maps

Access Point Placement Optimization for a CBTC System Wireless Data Communication Network

2020 ◽  
Author(s):  
Arash Aziminejad ◽  
Yan He
Keyword(s):  
Data Communication ◽  
Access Point ◽  
Transportation Systems ◽  
Wireless Data ◽  
Urban Centers ◽  
Placement Optimization ◽  
Data Links ◽  
Site Survey ◽  
Data Communication Network ◽  
Wireless Mobile Communication

Abstract Radio-based Communication-Based Train Control (CBTC) systems are widely utilized in major urban centers around the world to improve capacity, performance, and safety of public rail transportation systems. The system primary functionalities are performed based on the wireless mobile communication media, through which wayside-onboard communication data links are established. The focus of the presented research is to improve the performance of the CBTC wireless network by providing an efficient framework for placement optimization of the wayside transceivers aiming to maximize the radio coverage. The QoS-oriented convex optimization cost function is based on a heuristic model of radio wave propagation in the tunnel environment. The optimization engine uses the robust, efficient, and well-behaved Nelder-Mead algorithm. Furthermore, to provide reliable means for verification, numerical results are compared with measured data produced through an empirical site survey process performed for an actual CBTC system deployment.

scholarly journals One Slope Model: Efforts to Optimize Wifi Networks in the Office of communication and informatics in Palembang

2020 ◽  
Vol 2 (1) ◽  
pp. 23-32
Author(s):  
Winda Wulandari ◽  
Ari Muzakir
Keyword(s):  
Network Performance ◽  
Access Point ◽  
Wifi Networks ◽  
Coverage Area ◽  
Propagation Models ◽  
Existing Problems ◽  
The One ◽  
The City ◽  
Point Placement

Information technology in the field of transmission that is currently developing, one of which is Wi-Fi. Wi-Fi devices provide user convenience in carrying out their activities. The quality of Wi-Fi network performance can be known by the reception of the signal received by the user. If the placement of an access point (AP) is done correctly, the network will be optimized. There are several propagation models in the room that can be used as a guideline in determining the placement of the AP, one slope model is a way to measure the average level of a building and only depends on the distance of the transmitter and receiver. This research was conducted in order to overcome the problem of Wi-Fi network area coverage at the Office of Communication and Information of the City of Palembang. This study conducted an experiment to change the layout of AP's placement, measure and calculate data in priority with the one slope model. The results of measurements and calculations carried out analysis and comparison in order to determine the results of the experiments conducted. The results of this study indicate that an attempt to change the AP layout with one slope model can overcome existing problems and get better Wi-Fi coverage area performance. In the calculation with the one slope model of the 2-trial access point placement results in a decrease and an increase in signal. The signal reduction occurred in experiment 1, whereas in experiment 2 (design 2) the signal increased by 1.46dBm.

scholarly journals Validation of Three-Dimensional Ray-Tracing Algorithm for Indoor Wireless Propagations

2011 ◽  
Vol 2011 ◽  
pp. 1-5 ◽  
Author(s):  
Majdi Salem ◽  
Mahamod Ismail ◽  
Norbahiah Misran
Keyword(s):  
Ray Tracing ◽  
Electromagnetic Waves ◽  
Three Dimensional ◽  
Prediction Method ◽  
Access Point ◽  
Network Access ◽  
Multiple Reflections ◽  
Indoor Wireless ◽  
3D Ray Tracing ◽  
Tracing Algorithm

A 3D ray tracing simulator has been developed for indoor wireless networks. The simulator uses geometrical optics (GOs) to propagate the electromagnetic waves inside the buildings. The prediction technique takes into account multiple reflections and transmissions of the propagated waves. An interpolation prediction method (IPM) has been proposed to predict the propagated signal and to make the ray-tracing algorithm faster, accurate, and simple. The measurements have been achieved by using a single Wi-Fi network access point as a transmitter and a laptop as a receiver. Measured data had been collected at different positions in indoor environment and compared with predicted signals. The comparison of the predicted and measured received signals gave root mean square error of 2.96 dB and std. deviation of 2.98 dB.

scholarly journals Access Point Placement Recommendation Using Cost-231 Multiwall Propagation

2020 ◽  
Vol 10 (2) ◽  
pp. 103
Author(s):  
Fransiska Sisilia Mukti
Keyword(s):  
Wave Propagation ◽  
Distribution Pattern ◽  
Radio Wave ◽  
Signal Strength ◽  
Access Point ◽  
Propagation Model ◽  
Radio Wave Propagation ◽  
Signal Distribution ◽  
Point Placement

<p class="JGI-AbstractIsi">This study provides an overview of signal distribution pattern using Cost-231 Multi-Wall (MWM) propagation model. The signal distribution pattern is used as a reference in projecting indoor Access Points (AP) placement in Malang Institute of Asia. The MWM approach estimates the actual radio wave propagation value for measurements are made by considering obstacles between APs and user devices. The study recommends 10 optimal points of AP placement for the 1st, 3rd and 4th-floors, and 7 optimal points for the 2nd-floor. Determination of these placement points was based on the estimated signal strength obtained by users, at -50dBM up to - 10dBm, which is the range for good and excellent signal category.</p>

Optimal Configuration of Valves and Plumbing Lines in Complex Housing

2014 ◽  
Author(s):  
Pei Cao ◽  
Zhaoyan Fan ◽  
Robert Gao ◽  
Jiong Tang
Keyword(s):  
Design Optimization ◽  
Routing Algorithm ◽  
Shortest Paths ◽  
Computational Cost ◽  
Three Dimensional ◽  
Phase Method ◽  
Two Phase ◽  
Sequential Approach ◽  
Placement Optimization ◽  
Analytical Expressions

In engineering design, the volume and weight of a number of systems consisting of valves and plumbing lines often need to be minimized. In current practice, this is facilitated under empirical experience with trial and error, which is time-consuming and may not yield the optimal result. This problem is intrinsically difficult due to the challenge in the formulation of optimization problem that has to be computationally tractable. In this research, we choose a sequential approach towards the design optimization, i.e., first optimizing the placement of valves under prescribed constraints to minimize the volume occupied, and then identifying the shortest paths of plumbing lines to connect the valves. In the first part, the constraints are described by analytical expressions, and two approaches of valve placement optimization are reported, i.e., a two-phase method and a simulated annealing-based method. In the second part, a three-dimensional routing algorithm is explored to connect the valves. Our case study indicates that the design can indeed be automated and design optimization can be achieved under reasonable computational cost. The outcome of this research can benefit both existing manufacturing practice and future additive manufacturing.

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