High performance UAV-assisted communications system using simultaneous wireless information and power transmission (SWIPT) in mm-wave band is presented. UAV is a moving relay powered from a ground source through a power-splitting mechanism. In mm-wave band we utilize antenna array to increase the antenna gain while keeping array size small and practical. The radiation pattern of the UAV antenna is continuously adjusted to peak towards the source and destination. Two array geometries, a line and a cross, are designed for UAV antenna. We achieve near optimal pattern, utilizing innovative low power switches instead of phase shifters which are high power consuming components and using them here defies the purpose. We maximize the end-to-end cooperative throughput by optimizing the UAV power profile, power-splitting ratio profile, antenna weights (0, 1), and UAV trajectory for amplify-and-forward (AF) protocol. We consider two cases. Case1: UAV transmits and receives data simultaneously along two predefined trajectories. The antenna weights for line and cross arrays are optimized utilizing genetic algorithm. The power profile and, power-splitting ratio profile are also optimized using the penalty method. Case2: UAV accumulates the data and power along an optimal trajectory until it reaches the vicinity of target, when it transmits data at high bit rate. Here we define the optimization of parameters mentioned in Case1, while at an optimal point along the trajectory, as sub-problem1, and finding the next optimal point as sub-problem2. Sub-problem1 is solved using the genetic algorithm and dual decomposition method. Sub-problem2 is then solved using successive concave optimization. The overall problem, i.e. cooperative throughput, is solved by reciprocal iteration over the two sub problems. The simulation results show the proposed mm-wave band cross array antenna and switches can overcome the high frequency propagation losses, hence, achieving higher power harvest and data rates. The achieved higher data throughput outperforms the conventional single antenna low frequency systems.

提出了在毫米波段使用同时无线信息和电力传输（SWIPT）的高性能无人机辅助通信系统。无人机是一种移动继电器，通过功率分配机制从地源供电。在毫米波段，我们利用天线阵列来增加天线增益，同时保持阵列尺寸小而实用。无人机天线的辐射方向图不断调整，以朝向源和目的地达到峰值。为无人机天线设计了两种阵列几何形状，一条线和一个十字。我们实现了接近最佳的模式，利用创新的低功率开​​关而不是高功耗组件的移相器，在这里使用它们违背了目的。我们通过优化无人机功率分布、功率分配比分布、天线权重（0，1），以及用于放大转发（AF）协议的无人机轨迹。我们考虑两种情况。案例 1：无人机沿两个预定义的轨迹同时发送和接收数据。利用遗传算法优化线阵和交叉阵的天线权重。功率分布和功率分配比分布也使用惩罚方法进行了优化。案例2：无人机沿最优轨迹累积数据和功率，直到到达目标附近，此时它以高比特率传输数据。这里我们定义Case1中提到的参数的优化，同时在轨迹上的一个​​最优点，作为sub-problem1，寻找下一个最优点作为sub-problem2。使用遗传算法和对偶分解方法解决子问题1。然后使用连续的凹优化解决子问题2。整体问题，即协同吞吐量，通过两个子问题的相互迭代来解决。仿真结果表明，所提出的毫米波段交叉阵列天线和开关可以克服高频传播损耗，从而实现更高的功率采集和数据速率。实现的更高数据吞吐量优于传统的单天线低频系统。