论文标题
毫米波无线功率传输的性能分析与不完美的光束对齐
Performance Analysis of Millimeter Wave Wireless Power Transfer With Imperfect Beam Alignment
论文作者
论文摘要
在本文中，研究了不完善的光束对准（IBA）对毫米波（MMWave）无线功率传递（WPT）的影响。我们考虑一个MMWave WPT网络，其中能量发射器的位置遵循泊松点过程。我们采用了第三代伙伴关系项目（3GPP）建议的高斯天线模型，而不是大多数使用的平顶天线模型，以提高准确性。引入了两个梁对准误差（BAE）模型，即截短的高斯和均匀模型，以代表不同的BAE源。我们在两个BAE模型中得出了级联天线增益的概率密度函数（PDF），然后提供近似的PDF以实现拖延性。借助FOX的H功能，得出了非线性能量收集模型的能量覆盖概率的分析表达。此外，我们推断出平均收获射频（RF）能量的封闭式表达。模拟结果验证了我们的理论结果，并证明了BAE产生的性能降解。它还表明，在存在BAE的情况下，平面天线模型不能总是提供准确的性能评估。
In this paper, the impact of imperfect beam alignment (IBA) on millimeter wave (mmWave) wireless power transfer (WPT) is investigated. We consider a mmWave WPT network, where the location of the energy transmitters follows a Poisson point process. Instead of the mostly used flat-top antenna model, we adopt the Gaussian antenna model suggested by the 3rd Generation Partnership Project (3GPP) for better accuracy. Two beam alignment error (BAE) models, i.e., truncated Gaussian and uniform models, are introduced to represent different BAE sources. We derive the probability density functions (PDFs) of the cascaded antenna gain with both BAE models and then provide the approximated PDFs for tractability. With the help of Fox's H function, the analytic expression for the energy coverage probability with nonlinear energy harvesting model is derived. Besides, we deduce a closed-form expression of the average harvested radio frequency (RF) energy. The simulation results verify our theoretical results and demonstrate the performance degradation incurred by BAE. It also shows that the flat-top antenna model cannot always provide accurate performance evaluation in the presence of BAE.
