Combined optimization of Spectrum Handoff and Spectrum Sensing for Cognitive Radio Systems

The combined optimization problem of spectrum handoff and spectrum sensing for cognitive radio systems is considered in this paper. Obviously, the spectrum handoff is affected by the spectrum sensing results. In this paper, a combined optimization scheme considering the interaction of spectrum sensing and spectrum handoff is proposed to improve the performance of both the functions. Specifically, the spectrum sensing performance parameters false alarm probability and missing detection probability are taken into account to reduce the negative effect (both the interference to PUs and the service block of SUs) during the spectrum handoff procedure. The interference to the PUs could be reduced obviously by adapting this scheme, associated with a potential increase of switch delay of SUs. Besides, the proposed scheme will adjust the spectrum sensing algorithm parameters to enhance the sensing performance. Numerical results demonstrate the above performance improvement by using this scheme.