Abstract
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 are
two basic approaches for the user pairs’ information exchange
within a single time slot via the UAV relay. The first approach
is based on full-duplex, where all participants operate in the
full-duplex mode to transmit and receive signals simultaneously.
However, all transceivers have to operate in the face of severe
self-interference, which cannot be completely suppressed. The
second approach is based on conventional half-duplex, where
the users send their information to the UAV within a certain
fraction of the time slot, and the UAV relays them within the
remaining fraction to avoid the self-interference. In either approach, the joint bandwidth and power allocation maximizing the
sum information exchange throughput under realistic resource
and user throughput constraints poses a complex nonconvex
problem. New inner approximations are proposed for developing
path-following algorithms for their computation. Our numerical
results show that the time-fraction-based half-duplex approach
clearly outperforms the high-complexity full-duplex approach.
Original language | English |
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Journal | IEEE Transactions on Communications |
Early online date | 13 Oct 2020 |
DOIs | |
Publication status | Early online date - 13 Oct 2020 |