Optimizing DF Cognitive Radio Networks With Full Full-Duplex-Enabled Enabled Energy Access Points
Abstract: With the recent advances in radio frequency (RF) energy harvesting (EH) technologies, wireless powered cooperative cognitive radio network (CCRN) has drawn an upsurge of interest for improving the spectrum utilization with incentive to motivate joint information mation and energy cooperation between the primary and secondary systems. Dedicated energy beamforming is aimed at remedying the low efficiency of wireless power transfer, which nevertheless arouses out out-of-band EH phases and thus low cooperation efficiency. To address this issue, in this paper, we consider a novel CCRN aided by full full-duplex (FD)-enabled enabled energy access points (EAPs) that can cooperate to wireless charge the secondary transmitter while concurrently receiving primary transmitter’s signal in the first f transmission phase, and to perform decode-and-forward decode forward relaying in the second transmission phase. We investigate a weighted sum-rate sum rate maximization problem subject to transmitting power constraints as well as a total cost constraint using successive convex ex approximation techniques. A zero zero-forcing-based based suboptimal scheme that requires only local channel state information for the EAPs to obtain their optimum receiving beamforming is also derived. Various tradeoffs between the weighted sum-rate rate and other sys system tem parameters are provided in numerical results to corroborate the effectiveness of the proposed solutions against the benchmark ones.