Uma análise comparativa do padrão IEEE 802.11 operando em 2,4 GHz e 900 MHz.

Abstract

The use of wireless communication is widespread today. The modern society uses so often, in devices such as mobile phones, PDAs, notebook computers, radio and television to access a wide range of information. Such devices use transmission data systems by radio frequency (ie, through electromagnetic waves). In this scenario, we can emphasize the implementation of wireless networks for many different activities, such as the factories's monitoring, traffic control lights, cars flow assessment, of power transmission lines's monitoring, environmental and disaster situations, and support on the battlefield. Therefore, it is common to see several places in an intense occupation in the frequency range of 2.4 GHz, resulting from wireless networks operating in these regions. The transmission signal of each of these networks generates interference in other neighboring networks. This ends up worsening the interference signal quality perceived by the receptors, causing the quality of the connection between the nodes proportionally degrades the occupation of the spectral range in the vicinity of network operation. Some networks, in order to try to improve the quality of the connection, have the power of the signal increased to the extent permitted by law, further impairing the operation of other networks that operate within limits lower powers. Our goal is to verify the IEEE 802.1 lb and IEEE 802.1 l g is suitable to operate in the frequency range of 900 MHz, making a comparative analysis of performance with a network operating in the frequency range 2.4 GHz.