Iterative cooperative sensing on shared primary spectrum for improving sensing ability

In this paper, we propose a novel cooperative sensing method by iteratively improving the sensing ability. The proposed method can increase the number of cooperative sensing nodes. Moreover the harmful interference can be avoided, even if the sensing information of each sensing node is transmitted at the same spectrum of the primary system. In general, the cooperative sensing ability depends on the number of the cooperative nodes providing sensing information. If these pieces of information are exchanged in the same spectrum of the primary system, the number of cooperative nodes is limited by the transmit power of each node to avoid giving interference toward the primary system. In this paper, we propose an algorithm to improve the cooperative sensing ability by iteratively deciding the transmit power of sensing node and cooperation area.