In this letter, a Cloud Radio Access Network-type cluster-head-driven uplink model for multiple-antenna Unmanned Aerial Vehicles (UAV) relaying schemes is presented, which enables joint Maximum Likelihood symbol detection in the UAV cluster-head and the selection of UAV sources to communicate with each other aided by UAV-based relays. A relay selection technique, named Cluster-Head-Driven Best-Link (CHD-Best-Link), which employs cluster-head buffers and physical-layer network coding, is devised. A recursive maximum minimum distance relay selection strategy that exploits time-correlated channels and equips the CHD-Best-Link scheme is also developed. Simulations illustrate that CHD-Best-Link has superior average delay and bit error rate performances to that of previous schemes.

中文翻译：

---

递归最大最小距离的C-RAN型簇头驱动无人机中继

在这封信中，提出了一种用于多天线无人机 (UAV) 中继方案的云无线电接入网络类型的簇头驱动上行链路模型，该模型能够在无人机簇头中进行联合最大似然符号检测和选择无人机源在基于无人机的中继的帮助下相互通信。设计了一种中继选择技术，称为簇头驱动最佳链路（CHD-Best-Link），它采用簇头缓冲区和物理层网络编码。还开发了一种利用时间相关信道并配备 CHD-Best-Link 方案的递归最大最小距离中继选择策略。仿真表明，CHD-Best-Link 具有优于先前方案的平均延迟和误码率性能。