Throughput Improvement for Buffer-Aided UAV Relaying Communications With Jamming

Due to the high mobility of unmanned aerial vehicles (UAVs) and the broadcast nature of wireless communication channels, UAV systems are more vulnerable to malicious jamming attacks. This paper investigates a UAV assisted relaying communication system where a buffer-aided UAV acts as an aerial mobile relay to aid the information transmission between ground terminal nodes in the presence of malicious jamming. For the maximum end-to-end throughput, this paper formulates the optimization problem of joint communication scheduling, transmit power allocation and UAV trajectory planning under the buffer constraints. However, the non-convexity of the optimization problem will lead it to be intractable to obtain an optimal solution at an acceptable complexity, hence an efficient iterative algorithm is proposed to achieve an approximate suboptimal solution of the original problem. Numerical results not only demonstrate the convergence of the proposed iterative algorithm, but also indicate that the proposed joint design can considerably enhance the system throughput.