Outage Probability Analysis of Downlink UAV-assisted Cellular Systems

The deployment of unmanned aerial vehicles (UAVs) as floating base stations (BSs) has a huge impact in the field of wireless communication. Coverage area and spectral efficiency can be improved by efficiently using floating UAV base stations. Floating UAV BSs are very effective in delivering temporary ondemand services due to their flexible deployment capability. One of the major disadvantages of this model is that the Line of Sight (LoS) propagation environment causes severe interference to other adjacent cell users and UAV BSs. The effectiveness of the UAVs acting as wireless base station for the ground users is analyzed based on the outage probability of the LoS and non-LoS (NLoS) links. The outage probability of the downlink depends on both height of the UAV BS from the ground and its coverage radius. The analysis is carried out by varying the height and the coverage radius of the UAV BS. The simulation results show that the outage probability is minimum for an optimum height of 180m to 200m for a coverage radius of 500m and a Signal to Interference Noise Ratio (SINR) threshold of 10dB

Self-energized full-duplex UAV-assisted cooperative communication systems

In this paper, we propose a unified energy harvesting scheme using wireless power transfer (WPT), simultaneous wireless information and power transfer (SWIPT) and loop-back self-interference energy harvesting (SI-EH) enabled full-duplex (FD) cooperative communication system for unmanned aerial vehicles (UAVs). In contrast to traditional UAV assisted cooperative networks, here the UAV relies on alternative energy sources rather than pre-charged battery. Furthermore, the optimal time allocation for WPT and SWIPT scheme is obtained theoretically. Considering a delay-limited transmission mode, we derive an approximate close-form expression for the outage probability and the average throughput of the proposed system.This work was supported, in part, by sponsorship agreement in support of research by Ooredoo, Doha, Qatar, in part, by the Scheme for Promotion of Academic and Research Collaboration (SPARC), Ministry of Human Resource Development, India under the No. P145. The statements made herein are solely the responsibility of the authors.Scopu