AnÃlise de atenuaÃÃo de sinal em ambientes indoor usando lÃgica nebulosa / Analysis of signal attenuation for Indoor Environments using Fuzzy Logic

AUTOR(ES)
DATA DE PUBLICAÇÃO

2009

RESUMO

Due to the increasing demand for services related to wireless networks, such as video, voice and video conferencing and to the concern of telecommunications companies to meet this demand efficiently, the planning of a wireless link becomes very important. Since the propagation of a signal over a wireless network is not driven, it can suffer attenuation caused by obstacles in the medium during its transfer from the transmitting equipment to the receiver, varying the signal strength of the transmission in each area covered. For this reason, in order to plan a wireless network, the characteristics of the environment and infrastructure through which the signal will travel, needs to be taken into account, so it is possible to get the real value of the received power at each required point. Furthermore, since the prediction of the signalÂs attenuation in different places, taking into account the impact caused by each mentioned factor in its degradation, can be considered a complex process, it is necessary to use a model that not only considers the characteristics of the medium but also relates these factors in a simple manner allowing to measure the signalÂs attenuation caused by the barriers founded in the environment. The Shadowing Signal Propagation model allows the characterization of the attenuation caused by the environment through the β parameter present in this model. On the other hand, the Fuzzy Logic provides a form of approximate reasoning that allows the treatment of problems with incomplete, vague and imprecise information. Also, it offers a simple way to obtain a possible solution for a problem using the heuristic knowledge about a particular situation. In this way, the Fuzzy Logic can be an useful tool for calculating the β parameter of the Shadowing Signal Propagation model, making possible to obtain β values that characterize the attenuation of the environment in study. In this context, this work focuses on the analysis of signalÂs attenuation in indoor environments using fuzzy logic.

ASSUNTO(S)

rede sem fio lÃgica nebulosa fuzzy logic shadowing model of signal propagation beta (β wireless networks valor β ) value modelo de propagaÃÃo do sinal de shadowing telecomunicacoes

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