XL Simpósio Brasileiro de Telecomunicações e Processamento de Sinais

In this work, we propose a non-orthogonal multiple access (NOMA) scheme where the chaotic signals transmitted by each user are generated by the Lorenz chaotic attractor, joining the spectral efficiency of the NOMA scheme with the dynamical properties of chaotic signals, which we denominate chaos-NOMA. We employ a principal component analysis (PCA)...

The fading channel parameters vary according to the propagation environment, a fact already known and reported in the literature. It is evident that this variation directly impacts the performance of the system. In this paper, we investigate the effect of the stochastic variation of the unbalance parameter η of the complex model η-µ Format 2 for µ = 1/2,...

The complementarity of distributed ledger technologies such as Blockchain and the Internet of Things has gained increasing attention in the literature. In order to facilitate the immutable validation and registration of the data collected by the devices, the so-called smart contracts have been used and distributed applications have been developed to...

Amplificadores de potência em RF são a principal causa de inserção de distorções não lineares nos sistemas de comunicação digital. Arquiteturas de amplificadores mais eficientes, tal como a Doherty, tendem a introduzir ainda mais distorções no sinal a ser transmitido. Para mitigar esse problema de forma eficiente, torna-se necessário utilizar técnicas...

Devido à alta transmissão do vírus Sars-CoV-2 em ambientes fechados, este trabalho propõe a construção e a implementação de um sistema de monitoramento para distanciamento social, utilizando a linguagem de programação Python. A partir da análise de imagens obtidas por uma câmera e da biblioteca OpenCV (Open Source Computer Vision), foi possível realizar...

5G networks and the Internet of Things (IoT) can enable new business opportunities and services. Information security is a constant concern, even more so when new technologies and protocols are developed. Therefore, this paper presents a Systematic Review (SR) on information security in the physical and data link layers of 5G and IoT networks. As a...

This paper propose a method for aquatic seed classificaction. These seeds are taken from seed banks of the Brazilian Pantanal. Twelve species were selected, each with 20 samples. The data bank has 240 images. Those images are processed into a vector with 226 attributes. The proposed methods are Naive-Bayes, Logistic Regression, Decision Tree,...

The teaching of IoT has brought about new challen ges due to its inherent multidisciplinary nature. Also, this training must consider the particularities of wireless communications, as it is essential to guarantee communication in any IoT solution. In this article, we present and discuss part of the recent work on IoT teaching carried out by a team of...

Underwater acoustic communication systems are prone to performance degradation caused by the impulsive noise generated by snapping shrimps. In mathematical analysis or simulations, this noise is commonly modeled via temporally uncorrelated samples following the symmetric alpha-stable (SαS) distribution. In this article, the adequacy of this distribution...

In this work, we propose two admission control algorithms for Network Slicing aware of network and processing resources and that use overbooking techniques to increase the utilization of the 5G network infrastructure. We evaluate the proposed algorithms and compare them with an optimal solution, as well as a state of the art algorithm aware only of...