XXXIII Simpósio Brasileiro de Telecomunicações

In this paper, we present an application of Internet of Things (IoT) using Cloud concepts. The main idea of this application is monitoring and control of temperature and humidity of a room without human intervention. The application runs in real time and can be used anyplace where with internet access. For this, a sensor and an...

This paper presents a real time index proposal to evaluate the behavior of the received signal strength indication (RSSI) of a wireless sensor network (WSN) running in an industrial environment, to aid the management system decision taking with regard to the network reconfiguration. These indices are obtained based on the Sliding Window Boxplot Diagram...

Nowadays, cloud computing is a consolidated technology and users are taking all their data to the cloud. Security and privacy are strongly required by users who are concerned about their data being exposed. Cryptography is one of the solutions to avoid unauthorized access to data, but with so many cloud service providers, can users trust them the...

This paper aims at qualitatively evaluating the performance of routing virtual environments built with KVM and Xen virtualization platforms, combined with the OpenFlow protocol, which is used for creating Software-Defined Networking (SDN). Initially, Xen and KVM were installed on modern x86 servers to compare their CPU, RAM memory access and networking...

A commom distortion in the digitalization of documents is known as the Show-Through Effect, in which the image in the back of the document interferes in the digitized image of front side. Removing this kind of interference can be seen as an instance of the general Blind Source Separation Problem (BSS), for which several different techniques have...

In this paper, the performance analysis of energy detection of cognitive radio systems operating over -μ shadowed fading channel distribution is presented and investigated. The composite multipath/shadowing model provide remarkably accurate statistical characterization due considering both smallscale and large-scale fading in their physical model....

This work aims to discuss the characterization of access impedance in Brazilian indoor electric power grids for designing Power Line Communication (PLC) system suitable for the Brazilian characteristics. With this regards, we briefly describe a measurement campaign that was carried out to measure access impedance considering the frequency band...

This paper presents an analytical model to quantify the amplified spontaneous emission noise generated by optical amplifiers (booster, line and pre-amplifiers) used in elastic transparent optical networks. In addition, we propose a methodology to determine the maximum distance between in-line amplifiers to guarantee the network transparency...

In this work we investigate spectrum sensing strategies for enabling machine-to-machine applications in broadband communication systems. Our studies are carried out in two fronts: (i) experimental testbed using a dedicated software based on proprietary application programming interface for firmware spectrum analyzer; and (ii) computational...

Spatial signature or direction of arrival (DoA) estimation is a key problem in array signal processing with applications in radar, sonar, mobile communications and others. In this paper, we propose a tensor-based method to solve the blind spatial signature estimation problem. By assuming that a L-shaped receiver array is divided into smaller...