Ingeniería en Electrónica y Telecomunicaciones-Pregrado

Permanent URI for this collectionhttps://dspace-test.ucuenca.edu.ec/handle/123456789/43

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    Detección de fallas en paneles solares fotovoltaicos utilizando procesamiento de imágenes SWIR y técnica de electroluminiscencia
    (Universidad de Cuenca, 2025-03-13) Gómez López, Franklin Mauricio; Ochoa Correa, Danny Vinicio
    The growth of the solar industry has driven the need for effective methods to detect defects in photovoltaic systems, which inspired this study focused on the application of image processing techniques in the short-wave infrared spectrum (SWIR) through electroluminescence. Thiswork centers on the design and implementation of an experimental methodology to identify defects in commercial photovoltaic panels, using an OWL 640 M camera to capture images and combining image processing techniques with machine learning to detect cracks, interrupted contacts, and material anomalies. The proposed approach includes stages such as equipment calibration, individual cell analysis, and system performance evaluation, employing convolutional neural networks and a dataset tailored to the characteristics of the images. The results not only contribute to improving the efficiency and reliability of photovoltaic systems but also present opportunities in fields such as electronic component detection, humidity identification, liquid measurement, and contaminant analysis in food, highlighting the multidisciplinary impact of SWIR imaging.
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    Implementación de un sistema de transmisión multiportadora sobre una plataforma FPGA
    (Universidad de Cuenca, 2024-09-13) Castro Mendoza, Henry Mauricio; Cambisaca Sánchez, Jhonatan Paúl; Palacio Baus, Kenneth Samuel; Solano Quinde, Lizandro Damián
    Multicarrier modulation systems increase the bit rate in digital communications and optimize bandwidth usage compared to single carrier modulation systems. In this work, we implement OFDM and GFDM systems on a Red Pitaya FPGA STEMLab 125-14 platform. Implementing a multicarrier transmission system on an FPGA involves translating complex mathematical concepts into hardware-level operations. Mastery of the hardware description environment is crucial for addressing synthesis and delay issues, enabling the creation of a standalone transmission system without external hardware. The implementation of OFDM and GFDM is based on the vector representation of multicarrier systems, where the characteristics depend on the pulse-shaping filter used. OFDM employs a rectangular pulse, while GFDM uses a raised cosine filter. Both systems utilize 4-QAM symbols and synchronization frames to facilitate signal reception. To evaluate the system, we use the HackRF One device in conjunction with GNU Radio software. The received signal is compared with the theoretical signal using crosscorrelation, and the bit error rate (BER) is measured as a function of distance. The results show that the received signal closely matches the simulated signal and it was observed that GFDM requires 7% more SNR than OFDM to achieve a similar error rate. These findings validate the implementation and lay the groundwork for developing new technologies in multicarrier communication systems.
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    Determinación de modelos de propagación ajustados a zonas representativas de la ciudad de Cuenca en base a mediciones reales
    (2015) Gallardo Aguilar, Henry Rafael; Jaramillo Vásquez, Juan Carlos; Astudillo Salinas, Darwin Fabián
    The radio propagation modeling is very useful when making the planning of wireless communications networks, however, even though there are propagation models for different types of cities, none of them has been designed to predict the path loss for the city of Cuenca and its particular characteristics. Also, the process of determining an adjusted propagation model to reflect areas of Cuenca is presented, based on data acquired by an application developed for smartphones. With this application, also measurements are made to provide the coverage area parameter in a web application. A measurements campaign made in antennas located in defined representative areas are described respecting the norms and recommendations given by ARCOTEL and ITU. In the measurements, the signal intensity in function of distance to base stations is obtained. These measurements are compared with the prediction of the propagation models selected, of which the Xia - Bertoni model was the best. To adapt the model, the least mean square error between the predicted values of the model and measurements was minimized.
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    Planificación del acceso a radio de una estación base de tercera generación (3g) de la Corporación Nacional de Telecomunicaciones CNT EP en Suscal
    (2015) Chauca Cárdenas, Walter Javier; Méndez Villavicencio, Diego Vinicio; Ochoa Figueroa, Edgar Efraín
    Throughout the years, the demand of high-speed access on cellphones has increased. For this reason, CorporaciónNacional de Telecomunicaciones is improving their services. Nowadays, CNT is expanding and optimizing its Third Generation network around the country. That is why it has begun installing new network nodes with HSPA+ technology in many cities and optimizing the existing nodes with previous technology. Moreover, it is upgrading current nodes with earlier technology. This thesis project analyzes the planning of the radio network access from a CNT base station in Suscal city. The project focuses in the predictions of coverage and capacity in order to identify and establish the more relevant criteria to consider in a suburban area like this. In addition, it shows a report about the evolution from a Third to a Fourth Generation’s node.