Efficient Star-Topology Solving Local Minima for Geolocation in Real UMTS Networks: An Experimental Assessment with Real Data

García-Fernández, Juan Antonio; Jurado-Navas, Antonio; Fernández-Navarro, Mariano; Úbeda, Carlos

doi:10.1007/s11277-015-2895-z

Cited by 5 publications

(4 citation statements)

References 10 publications

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“…Finally, we also consider a model of N = 4 receivers placed in what we call a star topology due to its physical shape, resembling a star [18,19], where there is a central photodetector surrounded by three others forming an angle of 120 • between them with regard to the central photodetector. Its associated matrix is given by…”

Section: B Receiver Distribution Topologiesmentioning

confidence: 99%

Performance analysis of atmospheric optical communication systems with spatial diversity affected by correlated turbulence

Jurado-Navas

Álvarez-Roa

et al. 2022

J. Opt. Commun. Netw.

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This paper presents a complete analytical framework for obtaining the performance associated with a free-space optical (FSO) communication system with a spatial diversity and equal gain-combining technique. The system is affected by gamma–gamma scintillations with different realistic degrees of channel correlation depending only on the physical parameters of the link. We derive new analytical closed-form expressions for the average bit error rate (ABER) considering different scenarios to provide very realistic behavior of the system including different numbers of FSO receivers in several geometric configurations, with different receiving areas, different path lengths, and a variety of turbulence conditions. Furthermore, a very accurate approximate closed-form expression is also derived for the ABER of any generic coding scheme with either a very complex or, directly, no closed-form expression for its associated conditional BER that is first obtained in the ideal case of absence of turbulence. Numerical results via Monte Carlo simulation are provided to corroborate the validity of all the derived analytical expressions.

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Section: B Receiver Distribution Topologiesmentioning

confidence: 99%

Performance analysis of atmospheric optical communication systems with spatial diversity affected by correlated turbulence

Jurado-Navas

Álvarez-Roa

et al. 2022

J. Opt. Commun. Netw.

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“…A star topology (displayed in Fig. 4) has been proved as an efficient and robust geometry to avoid local minima [10]. Hence, scenarios with this geometry are weighted by a factor to assign them a priority factor.…”

Section: Division Of Scenariosmentioning

confidence: 99%

“…The resulting system of equations can be solved with the aid of the Levenberg-Marquardt (LM) algorithm. This iterative procedure has been proven to give the best trade-off between accuracy and computacional complexity [8], [9] and it will be supported by the selection of a smart spatial geometry of the sites [10] as well as a filtering stage prior to processing the events [6]. The scope of this paper is to describe a tool based on the combination of these ideas including, in addition, some improvements in the numerical method.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Assessment of a Novel Geolocation Algorithm Based on OTDOA Technique in Real UMTS Networks

Jurado-Navas

García-Fernández

Fernández-Navarro

et al. 2015

JOACE

Self Cite

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In this paper, we propose a new tool based on Observed Time Difference of Arrival (OTDOA) technique in order to estimate both the position of the different User Equipments (UEs) and the Relative Time Differences (RTDs) between Node Bs in real UMTS networks from measurements reports providing the TM parameter and the locations of the sites. This technique results in a non-linear least squares estimation problem which is solved by employing an iterative method based on the Levenberg-Marquardt (LM) algorithm and taking advantage of a particular and frequently found spatial geometry of sites: the star configuration. Modifications proposed in this paper increase its inherent accuracy while maintaining a reduced computational complexity, a fast convergence and a high robustness. Obtained results employing real data from various drive tests measured in different locations are compared with the performance of a standard LM algorithm run on these same measurements. We show that remarkably high geolocation and RTD accuracy is achieved considering only filtered events beforehand. 

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A Comparative Study between Iterative Algorithms for TDOA Based Geolocation Techniques in Real UMTS Networks

et al. 2017

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Efficient Star-Topology Solving Local Minima for Geolocation in Real UMTS Networks: An Experimental Assessment with Real Data

Cited by 5 publications

References 10 publications

Performance analysis of atmospheric optical communication systems with spatial diversity affected by correlated turbulence

Performance analysis of atmospheric optical communication systems with spatial diversity affected by correlated turbulence

Experimental Assessment of a Novel Geolocation Algorithm Based on OTDOA Technique in Real UMTS Networks

A Comparative Study between Iterative Algorithms for TDOA Based Geolocation Techniques in Real UMTS Networks

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