| Popis: |
This chapter discusses the spectrum and, by extension, spectrum sensing as the most essential aspect of the cognitive radio network scheme. The chapter further establishes that, by simply improving spectrum sensing, the challenge of spectrum scarcity and underutilisation can be significantly mitigated in modern wireless communications. Traditional approaches to spectrum sensing, such as energy detection and matched filter detection are discussed, alongside new and improved approaches to spectrum sensing, such as cooperative and predictive spectrum sensing. Some recent measurement campaigns on the spectrum are discussed to illustrate the importance of the spectrum in the overall cognitive radio network realisation. |
