XXXI Simpósio Brasileiro de Telecomunicações

This paper describes graduate studies at IST Lisbon (Technical University of Lisbon) in the area of Telecommunications. It starts by describing the Ph.D. programme, with its curricular components where students need to enrol in 5 courses. It also addressed the thesis process of this programme, which usually lasts for 4 years. Then, a degree more devoted...

We consider the transmission of confidential in- formation over a multiple-input multiple-output multiple- eavesdropper (MIMOME) wireless channel, in which an active eavesdropper is able to attack the channel sounding process through intelligent jamming. We focus on transmission systems based on generalized singular value decomposition (GSVD). We...

Most conventional Electrical and Computer Engineering programs offer only one basic course in Electromagnetics. Very rarely are students exposed to complex propagation and radiation problems that pertain to real world applications. One such important example is terahertz remote sensing, which requires advanced knowledge of electromagnetic propagation....

As plataformas para simulação de enlaces ópticos atualmente existentes são limitadas por dispositivos, os quais não permitem muita flexibilidade de configuração. Este trabalho apresenta um modelo para simulação de redes de Bragg que pode ser utilizado com a plataforma VPI (Virtual Photonics). Tal modelo permite a configuração de diversos parâmetros...

Neste artigo, considerando sinais de entrada gaussianos, expressões de modelo que descrevem o comportamento do algoritmo NLMS (normalized least-meansquare) em regime permanente são derivadas. Especificamente, expressões analíticas para o erro quadrático médio em excesso (EQME) em regime permanente e o desajuste são aqui obtidas, as quais permitem...

This paper presents a method to measure backscattering signal from antennas using a network analyzer connected to an anechoic chamber. We analyze the backscattered signals of two types of dipoles: wire dipole at the operating frequency of 1.8 GHz and microstrip dipole operating frequency of 900 MHz. The experimental results showed that the receiving...

Este artigo visa derivar um modelo descrevendo o comportamento médio do vetor de coeficientes do algoritmo IAFPNLMS (individual-activation-factor proportionate normalized least-mean-square) para sinais de entrada gaussianos complexos e reais. Para tal, uma decomposição alternativa é considerada para as matrizes de distribuição de ganhos e de...

Learning-based Super-Resolution methods have attracted much interest in recent years in many signal and image processing tasks. In this paper, we present an algorithm for single image super-resolution that use discrete cosine transform (DCT) interpolation and sparse learning-based super-resolution method. The input LR image is interpolated using...

Este artigo apresenta a aplicação de métodos de otimização para a síntese de uma rede linear que opere na faixa de frequência da tecnologia 4G no Brasil. O diagrama especificado apresenta o formato de cossecante ao quadrado, visando à obtenção de distribuição uniforme de potência dentro de uma célula e a redução da interferência co-canal com...

In cognitive radio is desirable that unlicensed users may have opportunities to transmit on unoccupied portions of the spectrum at a given time. A major challenge for the operation of these systems is the development of reliable spectrum sensing techniques, which enable an efficient allocation of the frequencies as they become available. This paper...