I was an intern on the automation department. My main duties were documentation of network topology and PLC logic, technical support to the field engineers and dealing with equipment suppliers. In one particular project, I was able to identify the improper placement of a costly flow meter on a cooling pipeline, helping the company avoid further losses.
Modeling and optimization of non-orthogonal multiple access (NOMA) techniques for 5G networks. More specifically, my work focus on user scheduling, channel allocation and power optimization in NOMA heterogeneous networks.
I worked on a project, on the cryptography laboratory, where I designed a physical layer authentication (PLA) system based on chaotic signatures. I proposed a framework to evaluate the chaotic sequence from a information-theoretic perspective, and derived a lower bound on the security performance of the system with respect to impersonation, substitution and replay attacks. State-of-the-art PLA rely on low SNR signatures, while the proposed system has a theoretical security lower bound independent of noise.
I worked on the cryptography laboratory designing a chaotic pseudo-random sequence generator and post- processing techniques for security applications. The proposed generator circuit has a significantly smaller footprint than other state-of-the-art chaotic pseudo random sequence generators. The sequences generated by the simulated circuit passed in all NIST tests for pseudo random sequences.
Design of a feedback envelope power amplifier to operate on microwave frequencies using CMOS technology.
Artiles, J.A., Chaves, D.P., Evangelista, J.V. and Pimentel, C., "Uma metodologia para geraçao de sequências aleatórias usando mapas caóticos." XXXIII Simpósio Brasileiro de Telecomunicaçoes (SBrT 2015), Juiz de Fora, pp.1-5.
Souza, C., Evangelista, J.V., Chaves, D.P. and Pimentel, C., 2016. "Spectral analysis of a chaotic map based on the hyperbolic tangent function." Journal of Communication and Information Systems, 31(1).
Evangelista, Joao V. C., 2016, "Physical-layer authentication Using chaotic maps." M.Sc. Thesis, Universidade Federal de Pernambuco.
Z. Sattar, J. V. C. Evangelista, G. Kaddoum and N. Batani, "Analysis of the cell association for decoupled wireless access in a two tier network," 2017 IEEE 28th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC), Montreal, QC, 2017, pp. 1-6.
Evangelista, J.V., Sattar, Z., Kaddoum, G. and Chaaban, A., 2018. "Fairness and Sum-Rate Maximization via Joint Channel and Power Allocation in Uplink SCMA Networks." arXiv preprint arXiv:1805.11722.
Z. Sattar, J. V. C. Evangelista, G. Kaddoum and N. Batani,, 2018. "Spectral Efficiency Analysis of the Decoupled Access for Downlink and Uplink in Two Tier Network." arXiv preprint arXiv:1808.02523