Redes de próxima geração: uma abordagem teórica sobre redes de rádio cognitivo

Abstract

The technological advance of the last decades has enabled a great convergence in the use of wireless networks. The rapid acceptance and viability of the use of wireless networks has caused the appearance of certain barriers in its use. The current wireless networks are characterized by a policy of static allocation of frequency, which can cause a shortage frequency. From this barrier the concept of obstacle Cognitive Radio arose. A Cognitive Radio is defined as a radio that can change its transmission parameters based on interaction with its environment. As the idea of Cognitive Radio Networks is recent and is still in development, several problems are still open, the necessity of a study on the state of the art of Cognitive Radio Networks is essential.