无人机中继协助的有限码长隐蔽通信

由于中长距离的无线隐蔽通信中信号发射功率较大,容易被监测者检测到,针对此问题该文提出无人机(UAV)中继协助的有限码长隐蔽传输方案.首先,根据无人机通信的信道模型,推导从发射机经过无人机中继到合法接收机的信噪比(SNR),得到隐蔽传输中断概率及吞吐量的表达式;然后,分析监测者的检测性能,?即KL(Kullback-Le...

UAV-relay Assisted Covert Communication with Finite Block-length

To avoid the high detection in long-distance covert communications due to the large transmission power, an Unmanned Aerial Vehicle (UAV)-relay based covert communication scheme with finite block block-length is proposed in this paper. Firstly, the Signal-to -Noise-Ratio (SNR) at the legal receiver via the UAV-relay is derived, based on which the outage probability and throughput of the covert communication link are also obtained. Secondly, the detection performance of the monitor is analyzed, i.e. KL (Kullback-Leibler) scatter, and it is used as a constraint on the covert communication. Finally, to maximize the throughput of the covert communication, the transmission power at the transmitter and the UAV-relay, as well as the flight height of UAV are jointly optimized. The simulation results verify the performance of the proposed covert communication scheme, and also show its superiority to the traditional strategies without UAVs since it greatly reduces the KL divergence at the warder.