论文标题
自适应调制用于摇动无人机的空对地面链接中的毫米波带
Adaptive Modulation for Wobbling UAV Air-to-Ground Links in Millimeter-wave Bands
论文作者
论文摘要
新兴毫米波（MM波）无人驾驶汽车（UAV）空对地面（A2G）通信面临着无人机不可避免的摇摆不定引起的多普勒效应问题。 UAV A2G通信的快速变化通道可能会导致通道估计的过时的通道状态信息（CSI）。在本文中，我们介绍了两个检测器来解码接收的信号，并在不完美的CSI下获得MM-WAVE无人机无人机链路的瞬时位误差概率（BEP）。基于设计的检测器，我们提出了一种自适应调制方案，通过优化以最大可容忍的BEP优化数据传输时间，以最大化CSI下的平均传输速率。功率控制政策与自适应调制结合使用，以最大程度地降低传输功率，同时保持BEP在阈值和最大平均传输速率下。数值结果表明，提出的自适应调制方案与功率控制策略结合使用可以最大化时间平均的传输速率，而节省多达50 \％的能量。
The emerging millimeter-wave (mm-wave) unmanned aerial vehicle (UAV) air-to-ground (A2G) communications are facing the Doppler effect problem that arises from the inevitable wobbling of the UAV. The fast time-varying channel for UAV A2G communications may lead to the outdated channel state information (CSI) from the channel estimation. In this paper, we introduce two detectors to demodulate the received signal and get the instantaneous bit error probability (BEP) of a mm-wave UAV A2G link under imperfect CSI. Based on the designed detectors, we propose an adaptive modulation scheme to maximize the average transmission rate under imperfect CSI by optimizing the data transmission time subject to the maximum tolerable BEP. A power control policy is in conjunction with adaptive modulation to minimize the transmission power while maintaining both the BEP under the threshold and the maximized average transmission rate. Numerical results show that the proposed adaptive modulation scheme in conjunction with the power control policy could maximize the temporally averaged transmission rate, while saves as much as 50\% energy.
