A Low Complexity Cooperative Sensing Method Exploiting Two Level Sequential Detection

Spectrum sensing is the first key functionality to realize Cognitive Radios which also meet harsh performance demands under various severe conditions, e.g. the reliability and sensitivity demands under the low sensing overhead constraint. Cooperative sensing exploiting SPRT is an efficient sensing method which can significantly decrease sensing delay and sensing overhead, thereby, has been extensively studied. However, how to implement sequential detection with low signaling complexity and less sensing delay has not been considered yet. In this paper, we proposed an efficient and reliable cooperative sensing scheme where each SU reports their local decisions multiple times before the global decision is made. We will demonstrate that our proposed scheme is capable of not only achieving the high sensing performance but also the low sensing delay and overhead.