Comparative study on various radio frequency spectrum sensing techniques.

摘要

Cognitive radio (CR) is a self-monitoring wireless communication system. CR can utilize the radio frequency spectrum efficiently. The main objective of cognitive radio is to detect the primary user signal and determine whether a channel is free or not. The CR user can opportunistically use those idle spectrum bands without causing harmful interference to the licensed/primary users. There are several spectrum sensing techniques which can serve this purpose. In this research, the computational complexities for different local spectrum sensing techniques are calculated. Using the results obtained from computational complexities, the energy efficient and time efficient techniques are determined. From the results obtained in local sensing techniques, the cost efficient and bandwidth efficient combination for cooperative spectrum sensing is determined. Using MATLAB programming, the receiver operating characteristic curves for these spectrum sensing techniques are plotted.