论文标题
使用分布式天线系统为医疗植入物进行柔性无线充电
Towards Flexible Wireless Charging for Medical Implants Using Distributed Antenna System
论文作者
论文摘要
本文介绍了IN-N-OUT的设计，实施和评估，In-N-Out是一种用于远场无线电源传输的软件硬件解决方案。即使植入物在人体内部移动，IN-N-N-OUT可以连续为居住在深层组织中的医疗植入物充电。为此，我们利用了分布式天线阵列的独特能量球模式，并设计了一种反向散射辅助的光束形成算法，该算法可以将RF能量集中在医疗植入物周围的很小的位置上。同时，其他身体部位的功率水平保持低水平，从而降低了过热的风险。我们在21个软件定义的无线电和印刷电路板（PCB）上原型IN-N-N-N-N-NEN。广泛的实验表明，In-N-Out在10厘米厚的猪肚内实现了0.37 〜MW的平均充电能力，这足以无线为各种商业医疗设备提供动力。我们与最先进的方法进行比较表明，当植入物固定时，IN-N-N-OUT达到5.4 $ \ times $ -18.1 $ \ times $ $功率，而5.3 $ \ times $ -7.4 $ \ times $ \ times $ wirmes $ power n当植入物正在运动时。
This paper presents the design, implementation and evaluation of In-N-Out, a software-hardware solution for far-field wireless power transfer. In-N-Out can continuously charge a medical implant residing in deep tissues at near-optimal beamforming power, even when the implant moves around inside the human body. To accomplish this, we exploit the unique energy ball pattern of distributed antenna array and devise a backscatter-assisted beamforming algorithm that can concentrate RF energy on a tiny spot surrounding the medical implant. Meanwhile, the power levels on other body parts stay in low level, reducing the risk of overheating. We prototype In-N-Out on 21 software-defined radios and a printed circuit board (PCB). Extensive experiments demonstrate that In-N-Out achieves 0.37~mW average charging power inside a 10~cm-thick pork belly, which is sufficient to wirelessly power a range of commercial medical devices. Our head-to-head comparison with the state-of-the-art approach shows that In-N-Out achieves 5.4$\times$--18.1$\times$ power gain when the implant is stationary, and 5.3$\times$--7.4$\times$ power gain when the implant is in motion.
