Mostrando ítems 1-4 de 4

Algoritmo de nodos adaptativos para solucionar el problema de los nodos huérfanos en una Red Inalámbrica de Sensores ZigBee en topología de árbol

Castro Casadiego, Sergio ; GUEVARA IBARRA, DINAEL; Medina Delgado, Byron; Sepúlveda, Sergio; Celis, Jose Miguel; CALDERON VILLAMIZAR, CRISTIAN DAVID (IngeniareChile, 2021-06)

We have developed an algorithm based on hybrid nodes composed of an XBee S2C module configured in API mode with escape and connected to a microcontroller ATMEGA 328P to solve the orphan node problem of a ZigBee tree ...
Compensation of frequency mismatch between transmitter and receiver local oscillators to enhance 5G-based radio-over-fiber transmissions

GUEVARA IBARRA, DINAEL; Hidalgo Monsalve, Dúmar; Medina Delgado, Byron; Alvarez Guerrero, Jesús; Amaya Fernandez, Ferney Orlando (Journal of Physics: Conference SeriesReino Unido, 2020-12-05)

Radio-over-fiber is a cost-effective support for the forthcoming 5G developments aimed to fulfill the ever-increasing demand for information. However, such systems are limited by transmission impairments that reduce the ...
Computer-aided design software for multi-stage amplifiers with bipolar transistors and field effect

Puerto, Karla; Sierra Peñaranda, Gabriela Alejandra; Ramírez Carvajal, Luis Eduardo; GUEVARA IBARRA, DINAEL (Journal of Physics: Conference SeriesReino Unido, 2019-12-19)

The following article presents computer-aided design software for multi-stage amplifiers with bipolar transistors and field effect. It is composed of two units: a design and analysis unit that allows for step-by-step ...
Measurement-based ray-tracing models calibration of the permittivity and conductivity in indoor environments

GUEVARA IBARRA, DINAEL; NAVARRO CADAVID, ANDRES; JIMENEZ, JORDI; CARDONA, NARCIS (Ingeniería y CompetitividadColombia, 2018-02-11)

In this paper, we show the results of a ray launching tool for channel estimation in indoor scenario and compare it with measurements in a DVB-T system, using a Vector Network Analyzer used to obtain the ...

Envíos recientes

Algoritmo de nodos adaptativos para solucionar el problema de los nodos huérfanos en una Red Inalámbrica de Sensores ZigBee en topología de árbol
...
Castro Casadiego, Sergio | 2021-06

We have developed an algorithm based on hybrid nodes composed of an XBee S2C module configured in API mode with escape and connected to a microcontroller ATMEGA 328P to solve the orphan node problem of a ZigBee tree topology. The sensor nodes have both features End Device and Router that may alternate depending on the situation, and the node can adapt itself to keep the network integrality as much as possible. On the other hand, the coordinator node comprises an XBee S2C module and the embedded system Raspberry Pi 3, which hosts the algorithm and is set up as an access point, a database server, and a web server. Using the proposed algorithm, we were able to recover up to 42.8% of the network coverage, but it comes with an energy cost due to the switch from End Device to Router. Additionally, a mobile application integrated with notification service and Google Maps was developed to monitor every node’s behavior in the Wireless Sensor Network.

LEER
Compensation of frequency mismatch between transmitter and receiver local oscillators to enhance 5G-based radio-over-fiber transmissions
...
GUEVARA IBARRA, DINAEL | 2020-12-05

Radio-over-fiber is a cost-effective support for the forthcoming 5G developments aimed to fulfill the ever-increasing demand for information. However, such systems are limited by transmission impairments that reduce the quality of communication. To enhance the system performance, an adaptive decision-feedback equalizer based on the least mean square algorithm is proposed in this work to compensate for frequency mismatch in the transmitter and receiver local oscillators in a radio-over-fiber transmission scenario when considering the latest 5G New radio standard. Simulation results in MATLAB exhibit a major impact from the equalization technique in improving the system performance in the presence of such a frequency offset, allowing the optical link to be extended from ∼100 km with no equalizer up to ∼690 km after equalization. Thus, it was demonstrated that the proposed adaptive equalization technique is a promising contender to enhance 5G-based Radio-over-Fiber data transmissions.

LEER
Computer-aided design software for multi-stage amplifiers with bipolar transistors and field effect
...
Puerto, Karla | 2019-12-19

The following article presents computer-aided design software for multi-stage amplifiers with bipolar transistors and field effect. It is composed of two units: a design and analysis unit that allows for step-by-step introduction of polarization and small signal values, the type of transistor to be used (bipolar or field effect) with their respective characterization values: current gain, thermal voltage, activation voltage, and saturation current, to result in the configurations and values of the resistors; and a theoretical unit that contains complete information on multi-stage amplifiers. A n-stage amplifier design method was developed, represented through a flowchart, and coded using a freely usable programming language. With the software, designs were made and simulated in a computational tool for academic use endorsed by the scientific community. The result for all variables evaluated was an average error of less than 2%. The research concludes that this software allows an effective design process of multi-stage amplifiers with bipolar transistors and field effect in a short time, it also allows changing the resistance values obtained for commercial values and calculating the error when implementing the circuit being a useful tool in the experimental area.

LEER
Measurement-based ray-tracing models calibration of the permittivity and conductivity in indoor environments
...
GUEVARA IBARRA, DINAEL | 2018-02-11

In this paper, we show the results of a ray launching tool for channel estimation in indoor scenario and compare it with measurements in a DVB-T system, using a Vector Network Analyzer used to obtain the Root Mean Square Delay Spread (RMS-DS), obtained from S12 parameter. We use a 10mW transmitter and make measurements in 39 different points in the scenario. Also we show the empirical adjustments made in the constitutive parameters, in order to improve the Delay Spread results. We show that this kind of ray based tools are very sensitive to the number of interactions considered in the model and also to the values of the constitutive parameters of the different elements in the scenario. For the low frequencies used for this work, we found also that some external elements can influence the results and must be considered for indoor simulations.

LEER

‹›

Repositorio Digital

Listar por autor "GUEVARA IBARRA, DINAEL"

Algoritmo de nodos adaptativos para solucionar el problema de los nodos huérfanos en una Red Inalámbrica de Sensores ZigBee en topología de árbol

Compensation of frequency mismatch between transmitter and receiver local oscillators to enhance 5G-based radio-over-fiber transmissions

Computer-aided design software for multi-stage amplifiers with bipolar transistors and field effect

Measurement-based ray-tracing models calibration of the permittivity and conductivity in indoor environments

Envíos recientes

Algoritmo de nodos adaptativos para solucionar el problema de los nodos huérfanos en una Red Inalámbrica de Sensores ZigBee en topología de árbol

Compensation of frequency mismatch between transmitter and receiver local oscillators to enhance 5G-based radio-over-fiber transmissions

Computer-aided design software for multi-stage amplifiers with bipolar transistors and field effect

Measurement-based ray-tracing models calibration of the permittivity and conductivity in indoor environments

Portales Institucionales

Enlaces de Interés

Contactos

Listar por autor "GUEVARA IBARRA, DINAEL"

Algoritmo de nodos adaptativos para solucionar el problema de los nodos huérfanos en una Red Inalámbrica de Sensores ZigBee en topología de árbol ﻿

Compensation of frequency mismatch between transmitter and receiver local oscillators to enhance 5G-based radio-over-fiber transmissions ﻿

Computer-aided design software for multi-stage amplifiers with bipolar transistors and field effect ﻿

Measurement-based ray-tracing models calibration of the permittivity and conductivity in indoor environments ﻿

Envíos recientes

Algoritmo de nodos adaptativos para solucionar el problema de los nodos huérfanos en una Red Inalámbrica de Sensores ZigBee en topología de árbol

Compensation of frequency mismatch between transmitter and receiver local oscillators to enhance 5G-based radio-over-fiber transmissions

Computer-aided design software for multi-stage amplifiers with bipolar transistors and field effect

Measurement-based ray-tracing models calibration of the permittivity and conductivity in indoor environments

Portales Institucionales

Algoritmo de nodos adaptativos para solucionar el problema de los nodos huérfanos en una Red Inalámbrica de Sensores ZigBee en topología de árbol

Compensation of frequency mismatch between transmitter and receiver local oscillators to enhance 5G-based radio-over-fiber transmissions

Computer-aided design software for multi-stage amplifiers with bipolar transistors and field effect

Measurement-based ray-tracing models calibration of the permittivity and conductivity in indoor environments