Abstract
In this paper, we investigate the resource allocation scheme for an unmanned-aerial-vehicle-enable (UAV-enabled) two-way relaying system with simultaneous wireless information and power transfer (SWIPT), where two user equipment exchange information with the help of UAV relay and harvest energy through power splitting (PS) scheme. Under the transmission power constraints at UEs and UAV relay, a non-convex intractable optimization problem is formulated which maximizes the sum retained energy of two UEs while satisfying the minimum signal-to-noise ratio requirement. We decouple the complicated beamforming and PS factor optimization problem into three solvable subproblems and propose an efficient alternating optimization scheme. Subsequently, in order to reduce the complexity, a robust scheme based on generalized singular value decomposition (GSVD) is designed. Finally, numerical results verify the robustness and effectiveness of the two proposed schemes.
Highlights
Unmanned aerial vehicles (UAVs) have received dramatical attentions in wireless communication networks since they have the capability of flexible mobility [1,2,3,4]
6 Results and discussion some simulation results are provided to evaluate the effectiveness of the proposed schemes for unmanned aerial vehicles (UAVs)-enabled two-way relay system with simultaneous wireless information and power transfer (SWIPT)
SWIPT technique was considered at user equipment (UE) to prolong the battery life
Summary
Unmanned aerial vehicles (UAVs) have received dramatical attentions in wireless communication networks since they have the capability of flexible mobility [1,2,3,4]. Compared to the traditional wireless terminals, UAVs can be regarded as mobile relays or base stations. UAV plays a critical role in the performance improvement and coverage extensiveness of the wireless communication network [5, 6]. UAV has huge potential in the intractable transmission environment, such as mountainous and emergency zones. The UAV which utilized as a relay has been widely investigated in the wireless network system. In [7], Song et al investigated the instantaneous rate maximization problem for UAV-enabled decode-and-forward (DF) relay system by jointly optimizing the precoding matrix
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