A Survey on Traditional and Advanced Spectrum Sensing Techniques in Cognitive Radio Networks

In conventional system, available spectrum is used inefficiently. Due to the limited available spectrum and inefficient utilization of spectrum, a new communication paradigm called Cognitive Radio (CR) have been introduced to exploit the existing wireless spectrum opportunistically. The objective of CR is to use the available spectrum efficiently without any interference to the Primary Users (PUs). Spectrum sensing plays an essential part in CR networks in order to obtain spectrum awareness. Energy detection, matched filter detection, cyclostationary detection are the most commonly used techniques for spectrum sensing. In this paper, a survey of traditional spectrum sensing methods along with several diversity enhancing techniques like cooperative spectrum sensing, compressive sensing, and wavelet transform sensing are included.