XXXV Simpósio Brasileiro de Telecomunicações e Processamento de Sinais

We propose linear-time encoding and decoding al- gorithms for multilevel LDPC lattices based on Construction D 0 . Moreover, a generalization of Construction D 0 is proposed which leads to a new class of multilevel lattices. Based on this construction, two-level LDPC lattices are designed that achieve performance comparable to that of polar lattices...

This paper addresses spectrum sensing and sharing strategies for machine type communication in the cognitive net- works. We assess how such solutions preserve the transmissions of the primary nodes, as well as their impact on the performance of the underlay secondary network. The system-level performance is evaluated by means of computer simulations...

Software Defined Network is a traffic engineering solution with an increasing interest by industry, which raises issues such as the use of multiple controllers. Considering that the positioning of controllers within a given topogoly constitutes a multiobjective optimization problem in order to satisfy certain performance metrics, this work presents...

Elderly, patients who suffered from strokes, neurological, articular, cardiovascular illness and other diseases like muscular dystrophies are examples of cases which affects an individual’s mobility. Thus, remote monitoring and care is an effective way to avoid the worsening of these sequels. With this question in mind, the development of a tool for...

The mobile devices technological evolution and the increased availability of IP (Internet Protocol) networks, created new opportunities for multimedia content distribution over Internet. Real-time applications require high quality service and are not tolerant to mean packet delay above 200ms, delay variations and throughtput reduction. The use the...

This work of Scientific Initiation describes the development of demultiplexers (DEMUXs) for wavelength- division multiplexing (WDM) over PMMA (poly-methyl- metacrylate) plastic optical fibre links using visible laser diodes. The DEMUXs were built from the combination of POF-splitters with gel plastic filters. The latter operates as high-pass or...

In this article we revisit the Radio Resource Allo- cation (RRA) problem of maximizing the ratio from the total data rate and the total utilized power subject to the QoS satisfaction (PMEE). It was previously studied in [1] and one optimal solution was obtained. However, that solution has a very elevated computational cost. In this article, we will...

This paper presents a new adaptive algorithm for solving the problem of joint antenna selection and beamform- ing in mobile communication systems. The proposed antenna selection technique is based on minimizing the co-channel interference, whereas the beamforming is carried out using a formulation of the minimum-variance...

Sistemas de comunicação sem fio operando na faixa das ondas milimétricas estão sujeitos a fortes degradações causadas pelo canal e por imperfeições de hardware como ruído de fase, desbalanceamento I-Q e não-linearidade dos amplificadores. Neste artigo, recentes modelos de imperfeições e de canal com desvanecimento propostos na literatura são combinados...

The wireless physical layer security can assist traditional encryption mechanisms by generating the keys, for instance. However, some techniques allow hiding information directly in the physical layer, such as performing precoding at the legitimate user information about the channel, such as the received signal strength or the phase response. Most works...