XXXIII Simpósio Brasileiro de Telecomunicações

Video streaming over IP is one of the applications with highest growth rate. In many cases, the quality of service in access networks is limited, which tends to reduce the quality of video playback. In parallel, multihoming communication systems allow the use of several interfaces for transmission. The availability of more than one interface for...

There have been many solutions for improving performance of TCP procotol over adhoc wireless networks. Several of these studies suggest changes in TCP, leading to changes in end points, which may be dif fi cult to implement. Other solutions seek to hide the problems in the TCP link, but which have proven to be ineffective. In order to...

Transmission systems known as Massive Multiple- input Multiple-output (MIMO) offer exciting opportunitie s due to their high spectral efficiencies capabilities. On the oth er hand, one major issue in these scenarios is the high-complexity de tectors of such systems. In this work, we present a low-complexity, near maximum-likelihood (ML)...

This paper presents an application of the kernel functions in the image edge detection problem. In Support Ve ctor Machines SVM, the kernels are a measure similarity class. Thus, an algorithm for edge detection with pixel-to-pixel a nalysis is proposed for two kernels, the Gaussian and the Polynomial kernel. Simulation results are presented to...

Telecommunication networks are resistant to random faults, but they are highly vulnerable natural disasters or targeted attacks which disturb their critical points. This paper investigates ways to estimate the vulnerability of networks in terms of connectivity. By representing networks in form of graphs, we can derive structural and spectral...

In this paper, a Greedy stream selection algorithm is proposed for a M × N K -user Multiple Input Multiple Output Interference Channel (MIMO-IC). The proposed algorithm tries to find the “best stream” allocation by removing streams with low signal-to-interference-plus-noise ratio (SINR) until the system capacity cannot be increased. The...

Within smart cities, electric vehicles (EV) rise as a sustainable transport and mobility option. Introduction of EVs to the grid requires control and management of electrical load where information and communication technologies (ICT) are the key to such interaction. This work presents a charging scenario and results from a tool built on MATLAB to...

In this paper it is proposed an algorithm to allocate resource blocks for LTE (Long Term Evolution) communication systems which considers the delay target estimated through Network Calculus using service curve and MFBAP (Multifractal Bounded Arrival Process) envelope process in order to decide on the scheduling of available radio resources. Comparisons...

The Ad dress Resolution Protocol (ARP) is used to map IP addresses to MAC addresses in local area networks. This protocol has some security vulnerabilities and one of them is the M an - in - the - Middle (MITM) attack . Software - Defined Networks (SDNs) represent an innov ative approach in the area of computer networks, since they...

The empirical mode decomposition (EMD) has been adopted for the suppression of acoustic noise from speech si gnal in the time domain. This paper investigates two alternative methods to decompose and enhance speech signals collected i n noisy environments. After the decomposition, the Hurst exp onent is used to select the most corrupted modes. The...