Energy efficient short‐packet‐communication in UAV‐assisted cognitive network

Abstract

This paper studies unmanned aerial vehicle (UAV)‐assisted cognitive network, where the UAV can improve the communication quality of edge users. Short packet communication (SPC) is widely used due to its low delay transmission characteristic. Unlike long packet communication in conventional wireless networks, SPC has a non‐negligible packet error rate and its data transmission rate is less than Shannon capacity. Considering the fact that the UAV is usually powered by battery, the energy efficiency (EE) maximisation problem is investigated based on short packet transmission in the UAV‐assisted cognitive network. Firstly, the closed‐form expression of EE is analysed, and then the optimisation problem is formulated by jointly optimising the spectrum sensing time, packet error rate, the flight speed, and the coverage range of UAV. Secondly, the optimisation problem is solved by dividing it into four subproblems. Then, an efficient iterative algorithm is proposed to tackle this problem. Simulation results show that the proposed optimisation scheme can evidently improve the EE performance compared with other benchmark schemes. In addition, the proposed joint optimisation algorithm not only has better convergence than exhaustive method, but also has higher stability than PSO algorithm.

Maximizing the energy efficiency in intelligent reflecting surface‐aided unmanned aerial vehicle data collection system in presence of malicious jammers

“…1 By the properly designing its trajectory, the UAV tends to obtain more dominant line-of-sight (LoS) channels and thus greatly improves the communication performance. [2][3][4][5] In particular, exploiting the UAV as an aerial data collector for IoT devices is considered to bring significant benefits for transmission rate, energy consumption, and service coverage. [6][7][8] However, due to the broadcast nature of wireless communications, the strong LoS channels also make UAVs more vulnerable to malicious attacks from ground, for example, jamming, surveillance, and eavesdropping.…”

“…Benefiting from the flexible mobility and deployment, UAV have been employed in numerous applications in recent years, such as remote surveillance, photography, and agricultural irrigation and so on 1 . By the properly designing its trajectory, the UAV tends to obtain more dominant line‐of‐sight (LoS) channels and thus greatly improves the communication performance 2‐5 . In particular, exploiting the UAV as an aerial data collector for IoT devices is considered to bring significant benefits for transmission rate, energy consumption, and service coverage 6‐8 …”