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Spectrum Sensing Techniques and Applications by Waslon Terllizzie Araújo Lopes, Fabricio Braga Soares de Carvalho, Marcelo Sampaio de Alencar

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CHAPTER 1

COGNITIVE RADIO

1.1 INTRODUCTION

The allocation of the electromagnetic spectrum among several telecommunications services is a complex task. Different technologies, based on the transmission of guided waves or free space propagation share the available frequency bands. The Radiocommunication Sector of the International Telecommunication Union (ITU-R) is responsible for recommendations regarding the international frequency allocation.

Several countries also established regulatory agencies, for telecommunication services and distribution of frequency bands. These agencies manage the spectrum occupation for different services. The Federal Communications Commission (FCC) in the United States, the National Telecommunications Agency (Anatel— ...

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