UAV-Aided Two-Way Multi-User Relaying

Unmanned aerial vehicle (UAV)-aided two-way relaying networks are designed, where a UAV is deployed to assist multiple pairs of users in their information exchange. There two basic approaches for the user pairs' exchange within single time slot via relay. The first approach based on full-duplex, all participants operate full-duplex mode transmit and receive signals simultaneously. However, transceivers have face severe self-interference, which cannot be completely suppressed. second conventional half-duplex, send certain fraction slot, relays them remaining avoid self-interference. In either approach, joint bandwidth power allocation maximizing sum throughput under realistic resource constraints poses complex nonconvex problem. New inner approximations proposed developing path-following algorithms computation. Our numerical results show that time-fraction-based half-duplex clearly outperforms high-complexity approach.