XXXI Simpósio Brasileiro de Telecomunicações

Multifractal Traffic, Global Scaling Parameter, Effective Bandwidth.

In this paper, we propose an analytical expression for estimating byte loss probability at a single server queue with multifractal traffic arrivals. The obtained expression is robust, stable and accurate in comparison with some existing methods in literature. Next we evaluate the potentiality of applying the proposed method in connection admission...

In this paper, we present a Matlab/FPGA platform with performance optimization for multiple-input multipleoutput (MIMO) systems simulation. This simulator combines the flexibility of high-level Matlab language with the FieldProgrammable Gate Array (FPGA) power processing. The variables involved in the simulation are generated in Matlab and sent to the...

This work presents a lightweight data compression method for wireless sensor networks. Instead of attempting to devise novel ad-hoc mechanisms to solve the problem, we attempt to show that, given previous general knowledge of the parameters that must be monitored, it is possible to efficiently employ conventional Huffman coding to represent the same...

A técnica OFDM tem sido empregada em muitos esquemas de modulação da atualidade. No entanto, esta técnica é bastante sensível a erros de sincronismo de tempo e frequência. Neste trabalho, apresenta-se a implementação, verificação e síntese em hardware digital de vários algoritmos de sincronismo temporal e de detecção do pacote usando símbolos do...

The degradation of the speech signal due to adverse conditions generates low accuracy rates in speech recognition systems. The authors propose mixing two methods: pre-extraction of attributes for speech enhancement and post-extraction of attributes for features compensation. According to their main focus, they are fundamentally oriented to minimize...

The quantum Fourier Transform is an important algorithm in Quantum Information Theory due to its capabilities to solve some Quantum Computation and Communication problems. However, so far, no practical quantum computer has been build neither its simulation is efficient on classical computers. Given these difficulties, this paper presents a software...

Modern routers employ input-queued crossbar switches that require sophisticated scheduling techniques for packet transmission. The performance of the router then directly depends on the scheduling algorithm, considering its throughput and complexity. In this paper, a new genetic-based scheduling algorithm is developed and tested for high-performance...

This article analyzes propagation characteristics of a wireless sensor network applied to precision agriculture. The evaluation performance of the networks is obtained through the RSSI (Received Signal Strength Indication), in a grape plantation. Experimental results showed that the distance between the sensor modules and the vegetation density...

In this work, we elaborate on the recently proposed generalized dynamic network coding (GDNC), relaxing the orthogonal constraint during the cooperative phase. By allowing the parity packets to be transmitted simultaneously, we show that it is possible to decrease the system outage probability (increase the diversity order) and/or increase the...