One-step-ahead spectrum sensing in cognitive radio systems with wireless energy harvesting

In this paper, we consider a cognitive radio system operating in slotted mode, in which the SU is powered exclusively by the energy harvested from radio signals in surrounding. Considering the tradeoff between energy harvesting, spectrum sensing and data transmitting, we propose the one-step-ahead spectrum sensing strategy, which is based on the current system state and estimation for the following one, in order to maximize the average throughput of the secondary user. The experiment results show that the proposed one-step-ahead spectrum sensing strategy outperforms the random one. Besides, influence of different factors to the one-step-ahead spectrum sensing strategy are also investigated.