Gustavo A. Siles

Gustavo A. Siles
Universidad Privada Boliviana · Electronics and Telecommunication Engineering

Ph.D. in Communication Systems and Technologies
Research Professor working on Radiowave Propagation and Wireless Communications.

About

44
Publications
7,823
Reads
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227
Citations
Introduction
B. Eng. in Electronics from the UMSS, Cochabamba, Bolivia, in 2002, Master on Microwave and Telecommunication Systems from the UM2, Montpellier, France, in 2006., and Ph.D on Telecommunications Systems. from the UPM, Spain, in 2012. From 2015 to 2017, I was with the Bolivian Space Agency. Since 2017, I am with the Universidad Privada Boliviana as Research Professor. My research interests are atmospheric propagation, satellite communications, and wireless communication systems.
Additional affiliations
April 2017 - present
Universidad Privada Boliviana
Position
  • Professor (Associate)
August 2016 - March 2017
Agencia Boliviana Espacial
Position
  • Projects Coordinator
July 2015 - August 2016
Agencia Boliviana Espacial
Position
  • Engineer
Education
January 2009 - December 2012
September 2005 - September 2006
February 1997 - December 2002
University of San Simón
Field of study
  • Electronic

Publications

Publications (44)
Article
Full-text available
Radiometers are commonly used in order to assess the atmospheric propagation channel under low-attenuation and scatter-free conditions, with an increasing tendency toward using millimeter frequencies. In this letter, the interest is concentrated on the analysis of atmospheric attenuation measurements simultaneously obtained, under clear sky and the...
Article
Full-text available
At frequencies of between 100 GHz and 30 THz, propagation conditions are severely affected by the influence of the composition and phenomena of the troposphere. This paper focuses on the use of radiometric measurements to estimate attenuation at 100 and 300GHz, considering non-scattering scenarios, in which the main contributions are given by atmos...
Conference Paper
The 0°C isotherm height is used in rain attenuation prediction models to calculate the rain height, as proposed in ITU-R Recommendations. In a previous study, statistical results on the variability of the 0°C isotherm were obtained for Madrid from ten years of radiosonde measurements. Such results are compared in this paper with statistics calculat...
Article
Full-text available
Cloud attenuation in satellite communication systems becomes a relevant issue as the frequency increases, and thus, it has to be taken into account when link availability is being calculated. This atmospheric impairment is a variable atmospheric phenomenon whose characterization has to be done not only on a yearly-basis but also on a seasonal and m...
Conference Paper
Most of the available rain attenuation models have been derived on the basis of experimental measurements carried out only at frequency bands below 20 GHz or with little data above this value. Universidad Politécnica de Madrid (UPM) is carrying out two experimental campaigns at the Ka and Q bands, measuring two beacon signals at 19.7 GHz (from the...
Article
Full-text available
En el presente artículo se introduce una aplicación web diseñada para el cálculo de estadísticas de atenuación por lluvia en Bolivia. Los cálculos que realiza son válidos para enlaces con el satélite boliviano TKSat-1 y se realizan en base la últimas Recomendaciones proporcionadas por la UIT-R. Se presentan un par de aplicaciones concretas tomando...
Article
Full-text available
RESUMEN La transición hacia la Televisión Digital Terrestre (TDT) en Latinoamérica es un fenómeno determinado por el contexto de cada país. En el presente artículo se busca describir cómo se gestionaron las políticas públicas en la transición hacia la TDT, en etapas de cambio de gobierno, en Argentina, Bolivia, Brasil y Ecuador. La investigación es...
Article
The experimental characterization of tropospheric effects on electromagnetic waves relies on the reception of a beacon signal transmitted by a satellite. The total tropospheric attenuation can be derived from these measurements in combination with additional information, specifically the attenuation due to atmospheric gases, in turn derived from an...
Article
Propagation campaigns are carried out at different frequencies and geographical areas to characterize the slant‐path propagation channel. One of the objectives of the Alphasat Propagation Experiment is to evaluate the performance of satellite links that operate in the Q/V band. Since March 2014, the copolar level of the Alphasat Q‐band beacon signa...
Article
Full-text available
El presente artículo se centra en revisar la situación de la implementación de la TDT en Bolivia, previa al Apagón Analógico, cuya postergación ha sido recientemente anunciada. Desde una perspectiva interdisciplinar, se realizó un análisis crítico de algunos aspectos, centrados en el caso boliviano, como: los criterios para la adopción del estándar...
Conference Paper
Rain attenuation prediction models usually require rain height data that can be derived from the 0°C isotherm height obtained as proposed in ITU-R Recommendations and also from radiosonde measurements. Communication systems that make use of fade mitigation techniques require accurate information on the parameters that describe the variability of th...
Conference Paper
As frequency increases, gaseous attenuation in Earth-Space links becomes more relevant. High altitude sites can be an interesting option for future potential deployment of ground stations for satellites with broadband communication links under low gaseous attenuation conditions. The present paper is part of a study aimed to characterize the propaga...
Conference Paper
The accuracy of different techniques in retrieving the integrated water vapor (IWV) is assessed. Specifically, radiosonde observation (RAOBS) data collected in two sites with different climatic conditions (Milan, Italy, and Uccle, Belgium) are used as a reference to evaluate the accuracy of IWV values extracted from the ERA5 database of the Europea...
Conference Paper
Full-text available
In satellite propagation, variability (the fluctuations of certain parameter or phenomenon over time with respect to its average behavior) is assessed by using some statistical variable such as its variance over the years. Overall, there are few reports on rainfall and attenuation variability and only very few on fade dynamics, due to the need of e...
Article
Full-text available
La implementación de redes WiFi que tienen alta densidad de usuarios es tema de interés en ingeniería de radiocomunicaciones. El presente artículo tiene por objetivo estudiar algunas de las problemáticas encontradas en una red de este tipo. Con este propósito, se realizan una serie de surveys pasivos sobre una red WiFi que se encuentra actualmente...
Conference Paper
Full-text available
As the use of high frequency bands is becoming more and more attractive for using on future commercial and military satellite communications, the effects of atmospheric water vapor and oxygen are more relevant. In order to reduce gaseous absorption effects, high altitude sites can be good candidates for deploying high capacity ground stations at th...
Article
Full-text available
La caracterización de la intensidad de lluvia, Rp (mm/h), para estimar la atenuación, A (dB) que produce una precipitación, es de gran importancia dada la relación directa entre ambas variables. Una descripción precisa de R requiere de estadísticas anuales obtenidas a partir de campañas de mediciones pluviométricas de varios años. En ausencia de es...
Conference Paper
The Q-band Alphasat beacon signal is being received in Madrid and now three complete years of measurements are available (from March 2014 to February 2017). In previous works the characteristics of the experiment-such as experimental setup and data processing-and attenuation results have been presented. This paper presents fade and inter-fade resul...
Conference Paper
Rain attenuation prediction models often require rain height data that can be derived from the 0º isotherm height obtained as proposed in ITU-R recommendations and also from radiosonde measurements. A study on the height of the 0º isotherm has been performed using radiosonde data for sites located in various regions of Spain. Communication systems...
Article
Satellite-to-Earth links are subject to several propagation effects in the troposphere, being rain attenuation the impairment that can cause the deepest fades. In this paper, the duration of both fades and the intervals between consecutive fades (inter-fade intervals) are characterized on the basis of the results of a long-term slant-path Ka-band p...
Conference Paper
Universidad Politécnica de Madrid (UPM) is participating in the Alphasat propagation experiment by measuring the copolar level of the Q-Band beacon at 39.4 GHz since April 2014. In this paper the results of the first two complete years of measurements (until March 2016) are presented with regards to excess and total attenuation. The reference level...
Conference Paper
Universidad Politécnica de Madrid (UPM) is participating in the Alphasat propagation experiment by measuring the copolar level of the Q-Band beacon at 39.4 GHz. In this paper the processing procedures are discussed and exemplified by their application to the first year of measurements (April 2014 to March 2015). In the first phase (data pre-process...
Article
This study is based on the results of a slant-path Ka-band propagation experiment carried out in Madrid, Spain, regarding rain attenuation, which is the main propagation impairment in this frequency band. The experimental and statistical results correspond to seven complete years of measurements, a period large enough to accomplish a comprehensive...
Article
The objective of this paper is to continue exploring the use of International GNSS Service (IGS) products as a tool to be used in Earth-space propagation experiments. With this purpose, 4 years of Zenith Tropospheric Delay data from IGS Villafranca station, in Madrid, Spain, have been processed with the aim to estimate the attenuation due to gases....
Article
Full-text available
This paper intends to give an overview about atmospheric propagation effects affecting millimeter and terahertz (THz) communication systems. The main focus is on attenuation caused by atmospheric gases and liquid water droplets, either in the form of suspended particles into clouds or rain falling hydrometeors. Theoretical aspects about each of the...
Conference Paper
Propagation in the millimeter-wave band has been analyzed using experimental measurements on three terrestrial links working at 38, 75 and 85 GHz carried out in Madrid, Spain. Rain attenuation is the most relevant impairment in such band. Statistics obtained from experimental attenuation time series have been compared with several model predictions...
Conference Paper
Full-text available
This study is based on the results of a slant-path Ka-band propagation experiment carried out in Madrid, Spain, regarding rain attenuation, which is the main propagation impairment in this frequency band. The experimental and statistical results correspond to seven complete years of measurements, a period large enough to accomplish a comprehensive...
Conference Paper
A single-channel radiometer operating at 19.7 GHz has been working at Universidad Politécnica de Madrid with the aim of retrieving atmospheric attenuation under non-scattering conditions. With the purpose of validating these estimates, they have been compared with attenuation values obtained by a GNSS receiver and radiosondes. From the first result...
Conference Paper
Universidad Politécnica de Madrid will participate in the Alphasat propagation experiment by measuring the copolar level of the Q-Band beacon at 39.4 GHz. The experiment objective and layout are presented in this paper, together with some examples of the first measurements carried out in the current preliminary phase of the experiment.
Conference Paper
In the present contribution, a 6-year database of Zenith Tropospheric Delay products, generated by the International GNSS Service (IGS), are exploited with the aim of estimating the water vapor attenuation in Madrid region at Alphasat beacon frequency of 39.4 GHz. In addition, a comparison study with estimates obtained by different methods is carri...
Conference Paper
Full-text available
A total power radiometer operating at 99 GHz was implemented for a propagation experiment aimed to estimate attenuation along a slant path, in Madrid. Valuable data was collected during a measurement campaign in mid-april of 2012. The retrieved time series of radiometric attenuation allow the use of this technique at this frequency to be validated,...
Conference Paper
A total power radiometer operating at 99 GHz was implemented for a propagation experiment aimed to estimate attenuation along a slant path, in Madrid. Valuable data was collected during a measurement campaign in mid-april of 2012. The retrieved time series of radiometric attenuation allow the use of this technique at this frequency to be validated,...
Conference Paper
Full-text available
The study of atmospheric propagation impairments at submillimeter and THz frequencies is becoming increasingly relevant due to the strong effects caused by the composition of the troposphere and the phenomena occurring in it. The present paper is devoted to the estimation of total attenuation at 100 GHz and 300 GHz under non-rainy scenarios. With t...
Article
Full-text available
The influence of atmospheric gases and tropospheric phenomena becomes more relevant at frequencies within the THz band (100 GHz to 10 THz), severely affecting the propagation conditions. The use of radiosoundings in propagation studies is a well established measurement technique in order to collect information about the vertical structure of the at...
Conference Paper
Propagation conditions at frequencies of between 100 GHz and 30 THz, also known as the THz range, are severely affected by the influence of the composition and phenomena of the troposphere. This paper is focused on important aspects of cloud attenuation under non-rainy conditions at 100 GHz and 300 GHz. Estimations of cloud and total attenuation ar...
Conference Paper
In this paper, the fundamentals of the estimation of gaseous absorption at frequencies between 0.1 and 1 THz are discussed, according to the commonly used ITU-R Rec. P. 676–8 model, based on the MPM (mm-wave propagation model). Preliminary results of theoretical calculations of THz atmospheric gaseous absorption, using radiosounding data, are expos...

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Projects

Projects (4)
Project
La investigación busca realizar un diagnóstico sobre la situación de la implementación de la TDT en Bolivia, sus efectos, retos, y perspectivas desde una perspectiva técnica-regulatoria y de generación de contenidos audiovisuales. Además, se busca estudiar la situación actual del espectro radioeléctrico en frecuencias UHF y sus perspectivas de uso ante la implementación de la TDT, describir el posible impacto que tendrá la transición a la TDT en las actuales emisoras, determinar si habrá un cambio en las lógicas de producción, el diseño de contenidos y la distribución de material audiovisual nacional, evaluar el impacto de una nueva ley de medios que regule los contenidos que se emitirán a través de la TDT, establecer vínculos de cooperación con universidades sudamericanas que investigan temas relacionados a la implementación de la TDT con el estándar ISDB-T, diseñar un plan de estudios para la formación de profesionales en el área de televisión digital, identificar líneas de investigación en el ámbito de la televisión digital, con la perspectiva de participar en proyectos o proponerlos a otras organizaciones, divulgar los resultados obtenidos en la comunidad universitaria, instituciones del Estado y organismos pertinentes, así como realizar videos divulgativos que permitan socializar los resultados de la investigación, así como dar a conocer al público amplio qué es lo que sucederá a partir de esta transición.
Archived project
Interactions of the atmosphere constituents (such as gases, clouds, rain and other hydrometeors) with the electromagnetic waves are the physical cause of the propagation effects in these frequency bands. In these bands, the troposphere is the most relevant layer for the propagation. It is an interesting subject of research the possible advantages and drawbacks of using these frequencies with special emphasis on the effects that can be detected or better measured by the use of instruments in this band. Specifically gaseous content on the atmosphere is of special interest.
Project
- Install a weather station at UPB premises and collect meteorological data. - Create a meteorological database from third-pàrty bolivian institutions, including radiosoundings and rain gauge data. - Analyze P-series of ITU-R Recommendations and apply to bolivian scenarios.