A Review on Spectrum Sensing Techniques for Cognitive Radio Networks

摘要

With the rapid growth in the wireless communication during last decade. The demand of spectrum resources increase day by day. Cognitive Radio can successfully deal with the growing demand. CR systems are radios with ability to exploit their environment to increase spectral efficiency and capacity. To exploit the limited spectrum efficiency, CR system allows unlicensed users (secondary users) to access licensed spectrum band of primary user when they are not occupied. To do this the secondary users need to continuously monitor the licensed user’s activity to find the unused band. Spectrum sensing is the basic and essential method to find the unused spectrum. It is one of the most challenging issues of CR process to prevent interference between primary users and secondary users. This paper present the overview of the available spectrum sensing techniques such as matched filtering, energy detection, cyclostationary feature detection, and cooperative spectrum sensing techniques.