Joint Optimization of Energy Harvesting and Spectrum Sensing for Energy Harvesting Cognitive Radio

For energy harvesting cognitive radio (EHCR), secondary user's (SU's) energy harvesting duration and spectrum sensing parameters jointly impact SU's capacity but have not been studied yet. In this paper, we investigate the joint impact. First, we obtain the closed-form expression of SU's capacity considering both limited energy supply and imperfect spectrum sensing. Then, we maximize SU's capacity while satisfying detection probability constraint and guaranteeing that the harvested energy is sufficient to transmit a certain amount of data payload. Simulation results prove that the optimized energy harvesting duration and spectrum sensing parameters dramatically improve SU's capacity.