Abstract
Due to flexibility in deployment and high mobility, unmanned aerial vehicles (UAVs) can improve the performance of cellular networks. In this paper, we focus on the UAV-assisted cooperative communication network where multiple UAVs serve as relays between a pair of ground users. Based on signal-to-noise ratio (SNR), we propose two UAV selection strategies namely best harmonic mean (HM) and best downlink SNR (BDS). Then, we derive the closed-form expressions for the outage probability, throughput and coverage probability of both the selection strategies. Furthermore, an optimization problem for maximizing the throughput is formulated, subject to the 3-D coordinates (i.e., x, y, and z coordinates) constraint of the selected UAV. The concavity of the problem is analyzed with respect to the horizontal placement of the selected UAV. Next, we propose algorithms to find optimal and sub-optimal position/coordinates of the selected UAV. Computer simulations validate the accuracy of the derived expressions, and demonstrate that BDS selection strategy has a significant performance gain at low SNR values, whereas both the selection schemes attain a similar performance at high SNRs.
Highlights
Due to their fully controllable mobility, flexibility in grouping, low cost, strong line-of-sight (LOS) channels with ground users (GUs) and quick deployment, unmanned aerial vehicle (UAV) has emerged as one of the most popular technologies in recent years [1]–[10] and it has many potential applications such as surveillance in disaster management and other emergency services, cargo delivery, aerial camera, etc
Influenced by the aforementioned discussion, in this paper we consider UAVs-assisted cooperative communication network wherein multiple UAVs serve as relays between a pair of GUs and focus on investigating the performance of two UAV selection strategies namely best harmonic mean (HM) and best downlink signal-to-noise ratio (SNR) (BDS) along with maximizing the throughput of the network
We investigate the performance of HM and BDS based UAV selection schemes in randomly distributed multiple UAV scenario
Summary
Due to their fully controllable mobility, flexibility in grouping, low cost, strong line-of-sight (LOS) channels with ground users (GUs) and quick deployment, unmanned aerial vehicle (UAV) has emerged as one of the most popular technologies in recent years [1]–[10] and it has many potential applications such as surveillance in disaster management and other emergency services, cargo delivery, aerial camera, etc. To the best of author’s knowledge, to date no work has analyzed the performance of multiple UAV based relaying network for independent and non identically distributed (i.n.i.d) small scale fading channels (which is a more practical scenario in terrain conditions). Influenced by the aforementioned discussion, in this paper we consider UAVs-assisted cooperative communication network wherein multiple UAVs serve as relays between a pair of GUs and focus on investigating the performance of two UAV selection strategies namely best harmonic mean (HM) and best downlink SNR (BDS) along with maximizing the throughput of the network. We derive the closed-form expressions of the outage probability, throughput and coverage probability for both the selection schemes to analyze the performance of the multiple UAV based relaying network considering i.n.i.d small scale fading channels.
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