XXXVIII Simpósio Brasileiro de Telecomunicações e Processamento de Sinais

This paper presents new case studies for the statistical analysis for wavelength resolution SAR image stacks. The statistical analysis considers the Anderson-Darling goodness-of-fit test in a set of pixel samples from the same position obtained from a SAR image stack. The test is applied in wavelength-resolution SAR image stacks. The present work...

With the increase in demand for frequency spectrum, it was necessary to search for more efficient ways to allocate users in the spectrum. The cognitive radio senses the spectrum and dynamically allocates users in unused spaces. The techniques for automatic classification of modulation have come to provide information that assist in spectrum sensing. For...

This work proposes a graph model for networks where node collaborations can be described by the Markov property. The proposed model augments an initial graph adjacency using diffusion distances. The resulting virtual adjacency depends on a diffusion-scale parameter, which leads to a controlled shift in the graph-Fourier-transform spectrum. This enables a...

In this paper, we performed a statistical study of the targets of wavelength-resolution synthetic aperture radar (SAR) images and addressed the problem of limited training samples. Based on suitable statistical models for the real targets of the evaluated SAR image, we considered a sample generator method to create computer-simulated targets. For such,...

The source-channel separation theorem states that in a communication system there is no performance loss if the source and channel code are designed independently. Actually, network protocols locate these codes in different layers. Furthermore, in communication systems with no retransmission capability, typically a complete channel decoder is used....

In this paper, we present a passive UHF RFID tag with an electric current sensor for identification purposes of the electric power consumed by an electrical-electronic equipment. By detecting the current flowing in the power cable of an equipment, it is possible to modify the identification conditions (the detection properties) of the tag within the...

A utilização da Internet das Coisas (IoT) está crescendo a cada dia e um dos fatores é a utilização de microcontroladores, como exemplo o ESP32, que possibilitam a conectividade entre dispositivos e uma versatilidade em suas aplicações. Este artigo tem como proposta a criação de um dispositivo vestível para pessoas com deficiência auditiva (DISPAUDI),...

Device-to-device (D2D) communication is expected to play a big role in 5G, in order to enable new applications in the mobile system such as vehicular-communications (V2X) and internet of things (IoT). This should increase the bandwidth demand, which makes higher spectral efficiency ever more desirable. This paper proposes a Deep Q-Learning power...

This work presents a study of coexistence between IMT 2020 systems (5th Generation mobile systems - 5G), using beamforming and sector antennas, and domestic satellite television reception stations (TVRO) in the C Band. It is proven that the greater directivity of beam-forming antennas used in IMT 2020 systems, combined with the use of filters with...

This paper describes a periodic rebroadcasting protocol for safety (warning) messages delivery in vehicular ad hoc networks (VANETs), following a multinomial probabilistic distribution modeling to calculate the successful delivery probability. The method uses Slotted Aloha as medium access control (MAC) protocol employing multiple communication channels....