Abstract
To expand their search range, unmanned aerial vehicles (UAVs) used for surveillance employ satellites as relays to forward monitoring data to the UAV’s command and control centers. With updated sensors, the amount of UAV detection data increases sharply, and the demand for bandwidth and transmission rates increase continuously. In this paper, the Ka-band is introduced to the satellite system as a solution instead of the Ku, C and other bands. Highly robust constant coded modulations (CCMs), such as the binary low-density parity-check (LDPC) and the coded quadrature phase shift keying (QPSK) are adopted to handle poor channel conditions caused by rain attenuation, which lead to a waste of spectral efficiency, especially in poor weather conditions; Adaptive Coded Modulation (ACM) can relieve the problems detailed above. Aiming at the problem mentioned above, we have proposed two different transmission schemes for two typical scenarios, including high quality of service (QoS) and high throughput service. The first is the so called automatic repeat request (ARQ)+ACM (target bit error rate (BER) algorithm) for high QoS, which means ARQ and ACM are employed by UAV-satellite links and satellite-center links, respectively. The second, denoted as coded cooperation (CC)+ACM (the maximum throughput algorithm) for high throughput services, designates that CC is employed for UAV-satellite links and ACM is employed for satellite-center links. Simulation results show that the ARQ+ACM scheme achieves higher spectral efficiency than CCM in cases that keep the BER below $10^{-5}$ , and the CC+ACM scheme attains 3 to 7.5 times the spectral efficiency of CCM.
Highlights
Wireless communications aided by unmanned aerial vehicles (UAVs, known as drones) are receiving increased attention from the academic and industrial fields as well as from the military and civilian applications [1]–[4]
NUMERICAL RESULTS AND ANALYSIS The validity of the proposed coded cooperation (CC) scheme based on Adaptive Coded Modulation (ACM) and the automatic repeat request (ARQ) scheme based on the ACM scheme for UAV-satellite-command and control center communications are tested
In the existing UAV surveillance systems, large amounts of data are returned in a single method and it is difficult to meet the varied demands of different information transmissions
Summary
Wireless communications aided by unmanned aerial vehicles (UAVs, known as drones) are receiving increased attention from the academic and industrial fields as well as from the military and civilian applications [1]–[4]. It is difficult to complete complex surveillance missions in remote areas because of the intricate and uncertain circumstances that restrict the ability of UAV to work over larger areas The solution to this problem is to use satellite relays to transmit the surveillance data. R. Xue et al.: Information Transmission Schemes Based on ACM for UAV Surveillance Systems With Satellite Relays. To improve the spectral efficiency over Ka-band channels, ACM schemes have been recently applied to Ka satellites. Applying ACM to satellite relay can improve spectral efficiency and power efficiency of the system Applications such as traffic monitoring and civil infrastructure inspections require specific quality of services (QoS), such as precise locations.
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