XXX Simpósio Brasileiro de Telecomunicações

This article presents a mathematical analysis of some models for the AWGN impulsive noise. The two main classes are the gated AWGN (GAWGN) and the gated gated AWGN (G 2 AWGN), and it is also assessed their influence on some systems of digital modulation. This assessment is made by the average probability of error bit and the equations are obtained...

In this paper it is showed that the Log-Pearson 3P is a good approximation of the probability density function of the maximum eigenvalue detection (MED) test statistic for cooperative spectrum sensing in cognitive radio applications, under the hypothesis that the primary transmitted signal is present. This result complements those already available...

This paper presents a new analytical model for the mean weight behavior of the Affine Projection adaptive algorithm for autoregressive inputs and unity step-size. Deterministic recursive equations are derived considering an initial transient previously not accounted for. This phase occurs at the beginning of the adaptation process, and is due to...

A new spectrum sensing approach for the spectrum sensing of wideband signals in cognitive radio (CR) systems is proposed. Eigenvalue detection techniques are combined with two data fusion schemes, where i) the samples collected by each CR are combined at the fusion center (FC) and ii) the eigenvalues of received covariance matrices in each CR...

As descargas parciais (DP) levam a degradação do isolamento de equipamentos de alta tensão. Logo, a identificação dos padrões de ocorrência destes sinais se torna útil na avaliação da vida útil dos equipamentos. A Transformada Wavelet é uma poderosa técnica que pode ser usada na rejeição/atenuação dos ruídos presentes nos sinais de DP. Este artigo...

In this work, we evaluate the transfer of multimedia ows in a wireless mesh network. For this aim, an appli ation is used, and based on the IP address of a lient devi e, one an identify the subnet where it is inserted, and spe i ows are transmitted to it, based on the lo ation of this AP. In order to evaluate the network used, UDP and TCP ows...

In this paper, we present a new receiver structure for layered space-time multiple-input multiple-output (MIMO) systems based on non-linear interference cancelation. The main idea of the proposed receiver is to use a bidirectional processing approach, where spatial filtering and interference subtraction start simultaneously at the first and last...

The distributed detection problem in wireless sensor networks using versions of been the subject of many studies over the last decade. This paper presents a performance comparison of two strategies for distributed detection which were results of these surveys. The first one uses identical sensors and majority rule in the fusion center and the second...

A wireless sensor network is a kind of ad hoc network that can be used to monitor a variety of environmental characteristics in various fields with, for instance, military purposes, environmental purposes, etc. A typical problem of these networks is how to collect and send historical information from all network sensor nodes to the base station. In...

This paper presents a modified version of the duality constrained least-mean-square (DCLMS) algorithm, which performs both beamforming and power control in mobile communication systems. In the original DCLMS algorithm, the transmission power update occurs only after the convergence of the beamforming process, implying successive convergence...