IEEE Trans Biomed Circuits Syst. 2019 Aug;13(4):756-765. doi: 10.1109/TBCAS.2019.2923780. Epub 2019 Jun 19.
This paper proposes an auto loss compensation (ALC) system to attenuate the time-variant path loss for capacitive-coupled body channel communication (CC-BCC). The system employs a time-division gradient indicator to continuously monitor the compensation conditions, and dynamically adjust the compensation inductor through a proportional integral (PI) controller. With the closed-loop topology, the proposed ALC system has two major advantages: first, the path loss induced by the backward coupling effect can be compensated without calibration; second, this system can dynamically attenuate the path loss, even when the channel characteristics vary with time. The simulation and experimental results show that the proposed ALC system can significantly attenuate the backward path loss, especially under wearable and motion scenarios.
本文提出了一种自动损耗补偿（ALC）系统，以衰减容性耦合体通道通信（CC-BCC）中的时变路径损耗。该系统采用时分梯度指示符连续监测补偿条件，并通过比例积分（PI）控制器动态调整补偿电感器。采用闭环拓扑结构，所提出的 ALC 系统具有两个主要优点：首先，无需校准即可补偿由反向耦合效应引起的路径损耗；其次，即使在信道特性随时间变化的情况下，该系统也可以动态衰减路径损耗。仿真和实验结果表明，所提出的 ALC 系统可以显著衰减反向路径损耗，尤其是在可穿戴和运动场景下。
