Research on spectrum sensing based on energy efficiency in cognitive radio network

The optimization problems of spectrum sensing and sharing in CR network are investigated in this paper. Firstly, the energy efficiency optimization problem, whose variables that should be optimized are sending power and sensing time of cognitive users, is derived. Then, a suboptimum algorithm is proposed. The simulation results show that the proposed algorithm is viable. The energy efficiency function starts to increase and then decreases when sending power and (or) sensing time exceed the threshold with the increasing with the increasing of sending power and (or) sensing time, respectively.