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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 3

DISTRIBUTED SENSING

3.1 INTRODUCTION

With the increase of users and new applications in wireless communications, cognitive radio requires improved ways to better evaluate the available spectrum. The goal is to identify spectrum holes for opportunistic transmissions in a fast and reliable way (Carvalho et al. 2014c).

There are important limitations when considering a single cognitive user monitoring the available bands in a specific location. Depending on the presence or absence of a primary user, the secondary (or cognitive) user can profit from the frequency bands to opportunistically transmit. However, a crowded scenario, such as the downtown of a big city, with multiple PUs and obstacles, such as buildings, trees, among others, can ...

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