XXXVIII Simpósio Brasileiro de Telecomunicações e Processamento de Sinais

This work investigates the impact of the channel model, and power allocation on the performance of a system employing Large Intelligent Surfaces (LIS). Most of the previous studies have considered the energy efficiency of such systems under the influence of Rayleigh channels and Zero-Forcing (ZF) precoding. We present results for Rice channels and...

This article demonstrates the validation of some elementary concepts of radar theory using a simulator based on the open-source 3D modeling software Blender. From a simply built 3D scene, it is possible to verify target detection, fading of the simulated radar signal, and features related to the system's spatial resolution, as it is provided by the...

Modern wireless communication systems increasingly need radio frequency devices capable of meeting their operating specifications. In this work, an antenna with multiband characteristics based on semi-spiral geometry and coplanar waveguide feed line is proposed for applications in the 5G sub-6 GHz standards. A study is done on the physical parametersof...

In this paper, Fuzzy decision rules, in the context of novelty detection, aims to increase efficiency and reliability related to defect identification associated with a set of A-Scan signals, obtained from a welded test piece in a non-destructive inspection using the Time-of-Flight Diffraction (ToFD) ultrasound technique. The training process only...

For detection in SCMA (Sparse Code Multiple Access) systems the optimal algorithm is MAP (Maximum a Posteriori). Although it has the best performance, MAP has high complexity for cases where there are a large numbers of users. Thus, the MPA (Message Passing Algorithm) has been studied as an option for detection in these systems. Even though it is...

This work studies the use of region adaptive hierarchical transform (RAHT) with predictive approaches for attribute compression of dynamic point clouds. An intra-frame predictive RAHT, where the intra-frame prediction residuals are encoded instead of the voxel attributes themselves, was shown to deliver large gains over conventional RAHT. We extend the...

The source separation task has been tackled from different approaches, including beamforming. The idea of exploiting geometric information of the sensors may contribute in convolutive mixture separation context, usually assumed in real scenario. This work proposes a beamformer algorithm for source separation based on the semblance coherence function. The...

One of the biggest challenges faced in multiple sensors systems is to provide an efficient combining data method to obtain information of interest as accurately as possible. This work presents a linear technique to combine the information from redundant sensors, in order to minimize the effects of noise. Results obtained using sensors from the Hadronic...

We propose a robust Time of Arrival (ToA) and Pulse Width (PW) estimator for Electronic Intelligence (ELINT) and Electronic Support Measures (ESM) systems in Electronic Warfare (EW) applications. Robust ToA and PW measurements of the intercepted radar pulse are assets in EW algorithms and are worthy to be pursued. The proposed estimation method is based...

This paper aims to relay the results from computer simulations of mechanisms for gradual transmission of epidemics with the susceptible-infected model over real networks in comparison to random ones. In particular, networks from the models of Erdos-Renyi, Watts-Strogatz (small world) and Barabási-Albert (scale free) are analyzed. By changing...