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RF energy harvesting can be used to power communication devices so thatperpetual operation of such devices can be ensured. We consider a RF energyharvesting underlay cognitive radio system operating in slotted fashion. Theprimary user (PU) is equipped with a reliable power source and transmits with aconstant power in all the slots. However, the secondary user (SU) harvestsenergy from primary's transmission and simultaneously transmits it's own datasuch that interference at the primary receiver (PR) remains below an acceptablethreshold. At the secondary transmitter (ST), each time slot is divided intotwo phases: energy harvesting (EH) phase and information transfer (IT) phase.We formulated the problem of maximizing the achievable secondary sum rate underprimary receiver's protection criteria as a convex optimization problem andobtained the optimal time sharing between EH and IT phase, and optimalsecondary transmit power under offline setting. The optimal offline scheme isthen compared with an online myopic policy, where the optimal time sharingbetween EH and IT phase, and optimal secondary transmit power are obtainedbased on instantaneous channel gains only.

On Optimal Offline Time Sharing Policy for Energy Harvesting Underlay Cognitive Radio