XXXIX Simpósio Brasileiro de Telecomunicações e Processamento de Sinais

Resumo-Com o objetivo de analisar a viabilidade de implementação de elementos de novos sistemas de comunicação sob uma abordagem SDR, este trabalho apresenta a prototipagem de um enlace de comunicação OFDM usando a ferramenta de código aberto GNU Radio e interface de hardware de baixo custo com HackRF One e RTL-SDR. Resultados preliminares se mostraram...

This paper presents a comparative study of acoustic signal enhancement methods in the presence of underwater noises. For this evaluation, the OMLSA, UMMSE and NNESE methods will be used, which are able to deal with nonstationary noises, for enhancing speech and chirp signals. Experiments are conducted considering three nonstationary acoustic noises,...

Sums of random variables (RVs) play a key role in the performance analysis of communication systems. In particular, sums of Nakagami-m RVs allow the performance characterization and evaluation of equal-gain combining (EGC) receivers, a classical diversity technique that has been explored in fifth-generation mobile networks. As the statistical...

Resumo- Neste trabalho mostra-se a aplicação de umreservoircomputerpara mitigar ruído adicionado a uma componentecaótica gerada a partir do mapa de Hénon. Assume-se queamostras do sinal caótico livre de ruído estão disponíveis paratreinamento, permanecendo desconhecido o processo caótico quegerou o sinal.

The vehicular Ad-hoc network (VANETs) is a challenging scenario for routing protocols. The high mobility of nodes is responsible for fast changes of topology and frequent interruptions of links. To cope with this challenge, Greedy Perimeter Stateless Routing (GPSR) and Ad-hoc On-demand Distance Vector (AODV) routing protocols have been devised and widely...

This paper presents a change detection (CD) technique for synthetic aperture radar (SAR) image stacks. The algorithm considers three SAR images as input. One image is a common reference for the other two. One image pair is used for detecting targets of interest, while the other assists in clutter suppression. The proposed method explores a control chart...

The various stages of a communication system are often not well explored in the academic environment due to the cost of radiofrequency equipment to put into practice the knowledge discussed in the classroom. The purpose of this work is to present an acoustic communication system prototype using script programming language, which can serve as a simple...

Open and free Digital TV remains an importantand popular service in Latin America, specially in Brazil with the implantation of the Brazilian Digital Terrestrial TelevisionSystem (SBTVD-T). This paper presents a case study of power measurements obtained according to the ABNT 15604/2017 standard, aiming to compare the coverage area of the digital...

Forecasting new COVID-19 daily cases is a task that favors actions that mitigate the damages caused by the virus. In this perspective, the present work evaluates different Machine Learning models for this purpose, considering different scales in Brazil (country, state, and city levels). After a grid search with 860 configurations, the results indicate an...

In this work we present two architectures of Kalman phase locked loop (PLL) to mitigate ionospheric scintillation induced effects on global navigation satellite systems (GNSS) receivers: a discriminator-based and an extended Kalman PLL using independent kinematic process models for the scintillation phase and amplitude to improve robustness in carrier...