Navegando por Autor "GOMES, Igor Ruiz"

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Acesso aberto (Open Access)
Comparison between known propagation models using least squares tuning algorithm on 5.8 GHz in Amazon region cities
(2011-06) CASTRO, Bruno Souza Lyra; PINHEIRO, Márcio Rodrigues; CAVALCANTE, Gervásio Protásio dos Santos; GOMES, Igor Ruiz; CARNEIRO, Oziel de Oliveira
This paper presents a performance comparison between known propagation Models through least squares tuning algorithm for 5.8 GHz frequency band. The studied environment is based on the 12 cities located in Amazon Region. After adjustments and simulations, SUI Model showed the smaller RMS error and standard deviation when compared with COST231-Hata and ECC-33 models.
Acesso aberto (Open Access)
Modelo de propagação indoor multi-andar em 2.4 GHz com estimativa de parâmetros de QoS em chamadas VoIP
(Universidade Federal do Pará, 2010-05-07) GOMES, Igor Ruiz; CAVALCANTE, Gervásio Protásio dos Santos; http://lattes.cnpq.br/2265948982068382
The advent of new multimedia forms has attracted many customers, concerns not only with the service, but also with the quality of service that can be offered. The WLAN have become the most common form of Internet routing, this is because of its low cost and ease implementation. To achieve a good routing planning it’s necessary to use propagation models. In the literature many propagation models make the prediction of signal strength but do not include the provision of quality of service metrics (parameters). In this sense this work proposes to develop an empirical propagation model indoor multi-floor that not only predicts the received power, but also makes a prediction for some metrics of QoS for VoIP (Voice over Internet Protocol). To develop the proposed model, measurement campaigns were performed on separate floors of a building while maintaining the position of the access point AP) fixed in one floor. Studies of analytical geometry were taken for counting and aggregation of losses on floors/walls. The results of the proposed model were compared with model of literature which has similar propagation behavior. To improve a comparison, a test with a simulated floor was introduced using the proposed model.
Acesso aberto (Open Access)
Posicionamento otimo de estações rádio base do serviço móvel celular utilizando modelo de conhecimento discreto em propagação outdoor
(Universidade Federal do Pará, 2018-12-14) GOMES, Igor Ruiz; CAVALCANTE, Gervásio Protásio dos Santos; http://lattes.cnpq.br/2265948982068382
A good wireless network design depends on technical, financial and what criteria you want to meet. New technologies and services, such as transmission in 5G, and the reuse of frequencies, several new studies are being done to ensure the best project for a given area. This work presents a discrete radio propagation model that uses the K-nearest neighbors classifier. The model takes into account different attributes of an environment, the studied environment was in the dependencies of the Federal University of Pará (Pará-Brazil), representing a typically Amazonian environment. For design the model, measurement campaigns were carried out in three different frequencies: 521MHz, 2100 MHz, and 2600 MHz. The study of the fading in these frequencies was made to make a generalization of frequencies to include in the model. Two scenarios to optimize the positioning of the base stations under study were carried out. The proposed model was applied in some scenarios, showing the power received at each point, in addition, tests for frequency of 700 MHz were performed to show how good the polynomial obtained was in the generalization of the frequencies.