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We consider a secondary user with energy harvesting capability. We designaccess schemes for the secondary user which incorporate random spectrum sensingand random access, and which make use of the primary automatic repeat request(ARQ) feedback. The sensing and access probabilities are obtained such that thesecondary throughput is maximized under the constraints that both the primaryand secondary queues are stable and that the primary queueing delay is keptlower than a specified value needed to guarantee a certain quality of service(QoS) for the primary user. We consider spectrum sensing errors and assumemultipacket reception (MPR) capabilities. Numerical results are presented toshow the enhanced performance of our proposed system over a random accesssystem, and to demonstrate the benefit of leveraging the primary feedback.

Optimal Random Access and Random Spectrum Sensing for an Energy Harvesting Cognitive Radio