Carlos Medina

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Verified

Carlos verified their affiliation via an institutional email.

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• Dr.-Ing.
• Professor (Full) at Technological University of Panama

Worldwide, integrating high shares of variable renewable energy sources (VRES) into the power grid is one of the most pressing challenges toward decarbonization and clean energy strategies. As VRES generation increases, it is imperative to support its economic deployment and use while securing the power system's stability and reliability. The inher...

Resumen: Con la integración masiva de fuentes de energía renovable, principalmente eólica y solar, la flexibilidad de los sistemas de potencia tiene especial importancia, pues es necesaria para responder a la naturaleza variable e intermitente de estas fuentes. Además de la flexibilidad, la integración masiva de fuentes renovables trae consigo otro...

5G has become a reality in Latin America and it is expected to boost the digital revolution with key capabilities, including higher speeds and ultra-low latency, thus enabling innovative solutions and socioeconomic development. But its deployment faces many challenges related to, among other factors, spectrum allocation and infrastructure deploymen...

Hyperspectral imaging has become a valuable remote sensing tool due to the development of advanced remote acquisition systems with high spatial and spectral resolution, and the continuous developments on more efficient computing resources to handle the high volume of data. For this reason, hyperspectral image analysis has found important uses in pr...

La biotecnología es una ciencia que tiene sus bases en múltiples campos. Integra diversos conocimientos que derivan de la tecnología y las ciencias biológicas aplicadas, así como la química y la física. Es una ciencia relevante para el desarrollo de la humanidad ya que encuentra aplicación en la medicina, la agricultura, la industria alimenticia, l...

Visible Light Communication (VLC) using light emitting diodes (LEDs) is a technology that provides an opportunity for high-speed low-cost wireless communication, being an alternative for effective and efficient communication that can cope with the actual high-speed wireless services demand. In this paper, we give an overview of LED-based VLC and pr...

This work suggests a method to solve the inverse problem of scattering using compressive sensing in order to locate and characterize targets in space. We consider the case of point scatters located on a small fraction of an overall region of interest. The measurement of the response of the scalar wave scattering from the objects is collected using...

Abstract— In this paper we propose a method to detect and reconstruct the image of objects by solving the inverse scattering problem using compressive sampling. This work is an extension of previous research where the authors considered the localization and reconstruction of dot targets and simple targets. Unlike the latter, now we deal with more c...

Abstract—This paper proposes a method for reconstruction of simple objects by solving the inverse scattering problem using compressive sampling. One is a continuation of research previously developed by the authors for locating point targets. Unlike the latter, now we are dealing with more complex objects which can be seen as a white spot formed by...

Abstract—Direct product convolutional codes are the result of a special concatenated scheme based on the well-known method of direct product for combining block codes. The approach taken for its construction is to consider convolutional codes as block codes over the field of rational functions F(D). This relatively new codes has been previously def...

Low density parity check (LDPC) codes are one of the error-correction codes more versatile, promising and important, and have been adopted in most of the current communication standards. Given the actual and future relevance of these codes, we have developed a graphical interface for simulation and performance analysis considering several factors t...

Estudios estadísticos basados en el análisis del límite de Cramér-Rao han demostrado que, en medios donde se busca estimar más de un objetivo, puede ayudar utilizar dispersores de apoyo. Igualmente se ha indicado en la literatura científica que utilizar estos dispersores puede tener un efecto contrario y reducir o eliminar la capacidad de estimació...

El problema de dispersión inversa permite la recuperación de algunas propiedades de objetivos dispersores, como la posición espacial o la reflectividad, utilizando mediciones remotas de campos que estos dispersan. Este problema está presente en muchas áreas de la ingeniería, como la geofísica, radar, imagenología médica, sensores remotos, ensayos n...

Los códigos de corrección de errores con matriz de verificación de paridad de baja densidad (LDPC), tanto de bloque (LDPC-BC) como convolucionales (LDPC-CC), tienen un excelente desempeño y permiten transmitir información con una eficiencia que se aproxima a la capacidad del canal de comunicación, y con una baja complejidad de codificación y decodi...

Compressed sensing (CS) is a rapidly growing field, attracting considerable attention in many areas from imaging to communication and control systems. This signal processing framework is based on the reconstruction of signals, which are sparse in some domain, from a very small data collection of linear projections of the signal. The solution to the...

This article documents the development and analysis of a computer vision-based hand detector for images and video. Ideas and contributions from several authors were combined, and it was determined that a feasible implementation of the hand detector can be achieved by using a cascade of boosted classifiers, along with gradient based descriptors, whi...

This article discusses the development, implementation, use and pedagogical aspects of graphical interfaces developed with LabVIEW for interactive applications used in teaching the basics of communication systems. The extensive and rich content of the courses related to communication systems, the high level of analysis involved in teaching these co...

It is well known that convolutional codes can be considered as block codes over a field of rational functions. Being a block code, every convolutional code has "block" distance d B . The free distance d f of a convolutional code is lower bounded by d B , d f ¿ d B . With this approach, every method of designing or combining block codes immediately...

An upper bound on the error probability (first error event) of product convolutional codes over a memoryless binary symmetric channel, and the resulting error exponent are derived. The error exponent is estimated for two decoding procedures. It is shown that, for both decoding methods, the error probability exponentially decreasing with the constra...

Product convolutional codes are investigated as an alternative concatenated scheme to construct full antenna diversity space-time codes. The proposed space-time code construction is analyzed and the conditions to achieve full diversity are determined. The resulting space-time codes are compared with space-time serially concatenated and woven convol...

We define and investigate the direct product of convolutional codes. Properties of generator and parity check matrices are considered. Free distance of a product convolutional code is estimated using both, active distances and the suggested concept of "block distances" of convolutional component codes. We show that every product convolutional code...