支持URLLC的UAV中继系统的联合发射功率和布局优化
Joint Transmit Power and Placement Optimization for URLLC-enabled UAV Relay Systems
摘要：
这封信认为无人机（UAV）启用中继通信系统提供超高可靠性的延迟关键的消息，其中中继是在转发器和转发（AF）模式下工作。我们的目标是联合优化无人机的位置和功率，以最大限度地减少解码错误概率，同时保证延迟约束。自由空间信道模型和三维（3-D）信道模型被认为是。对于第一个模型，我们提出了一个低复杂度的迭代算法来解决这个问题，而全球最优解推导的情况下，当信号噪声比（SNR）是非常高的。对于第二个模型，我们也提出了一个低复杂度的迭代算法来解决这个问题。仿真结果证实了我们提出的算法的性能优势。
英文摘要：
This letter considers an unmanned aerial vehicle (UAV)-enabled relay communication system for delivering latency-critical messages with ultra-high reliability, where the relay is operating under amplifier-and-forward (AF) mode. We aim to jointly optimize the UAV location and power to minimize decoding error probability while guaranteeing the latency constraints. Both the free-space channel model and three-dimensional (3-D) channel model are considered. For the first model, we propose a low-complexity iterative algorithm to solve the problem, while globally optimal solution is derived for the case when the signal-to-noise ratio (SNR) is extremely high. For the second model, we also propose a low-complexity iterative algorithm to solve the problem. Simulation results confirm the performance advantages of our proposed algorithms.
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