Impact of Mobility on Spectrum Sensing in Cognitive Radio Networks

Date Added: Sep 2009
Format: PDF

In Cognitive Radio Networks (CRNs), spectrum sensing is key to opportunistic spectrum access while preventing any unacceptable interference to primary users' communications. Although cognitive radios function as spectrum sensors and move around, most, if not all, of existing approaches assume stationary spectrum sensors, thus providing inaccurate sensing results. As part of the authors' effort to solve/alleviate this problem, the authors consider the impact of sensor mobility on spectrum sensing performance in a joint optimization framework for sensor cooperation and sensing scheduling. They show that sensor mobility increases spatio-temporal diversity in received primary signal strengths, and thus, improves the sensing performance.