The body channel based wireless power transfer(BC-WPT)method utilizes the human body as the medium to transfer power for bioelectronics,which can achieve a lower transmission loss due to its higher conductivity.Howeve...The body channel based wireless power transfer(BC-WPT)method utilizes the human body as the medium to transfer power for bioelectronics,which can achieve a lower transmission loss due to its higher conductivity.However,except for the channel length,different on-body loca-tions of the transmitter and receiver also influence the power supply performance.This paper fo-cuses on the wrist-to-forehead path to show the potential of BC-WPT for the brain bioelectronics such as the brain computer interface device.The channel characteristics from 10 MHz to 60 MHz are measured by a vector network analyzer(VNA)and a prototype BC-WPT system with differ-ent copper electrodes and the lowest power loss locates between-22 dB and-33 dB.Furthermore,the minimum path loss limit is simulated in Advanced Design System(ADS)software and the low-est optimum path loss can reach nearly-13 dB.Finally,a rectifier circuit is also built at the receiv-er side to harvest d.c.voltage.The results show that the open-circuit voltage(OCV)can reach 1.75 V with the transmitter of 50Ωoutput impedance supplying 5V_(pp)sine voltage at 60 MHz when adopt-ing 1 cm-diameter circular electrodes.展开更多
基于接收信号强度(Received Signal Strength,RSS)测量的定位精度依赖于路径损耗指数(Path Loss Exponent,PLE)O低精度的PLE值降低了对目标节点定位精度。为此,提出基于路径损耗指数修正的目标节点定位(Path loss exponent correction-b...基于接收信号强度(Received Signal Strength,RSS)测量的定位精度依赖于路径损耗指数(Path Loss Exponent,PLE)O低精度的PLE值降低了对目标节点定位精度。为此,提出基于路径损耗指数修正的目标节点定位(Path loss exponent correction-based Target node localization,PCTL)算法。PCTL算法先通过接收设备的敏感级别,感测信道和传输功率,并推导最小发射功率,再修正PLE。然后,依据修正后的PLE,并结合质心定位算法估计目标节点位置。仿真实验结果显示,提出的PCTL算法能够准确地估计PLE和目标节点位置。展开更多
文摘The body channel based wireless power transfer(BC-WPT)method utilizes the human body as the medium to transfer power for bioelectronics,which can achieve a lower transmission loss due to its higher conductivity.However,except for the channel length,different on-body loca-tions of the transmitter and receiver also influence the power supply performance.This paper fo-cuses on the wrist-to-forehead path to show the potential of BC-WPT for the brain bioelectronics such as the brain computer interface device.The channel characteristics from 10 MHz to 60 MHz are measured by a vector network analyzer(VNA)and a prototype BC-WPT system with differ-ent copper electrodes and the lowest power loss locates between-22 dB and-33 dB.Furthermore,the minimum path loss limit is simulated in Advanced Design System(ADS)software and the low-est optimum path loss can reach nearly-13 dB.Finally,a rectifier circuit is also built at the receiv-er side to harvest d.c.voltage.The results show that the open-circuit voltage(OCV)can reach 1.75 V with the transmitter of 50Ωoutput impedance supplying 5V_(pp)sine voltage at 60 MHz when adopt-ing 1 cm-diameter circular electrodes.
文摘基于接收信号强度(Received Signal Strength,RSS)测量的定位精度依赖于路径损耗指数(Path Loss Exponent,PLE)O低精度的PLE值降低了对目标节点定位精度。为此,提出基于路径损耗指数修正的目标节点定位(Path loss exponent correction-based Target node localization,PCTL)算法。PCTL算法先通过接收设备的敏感级别,感测信道和传输功率,并推导最小发射功率,再修正PLE。然后,依据修正后的PLE,并结合质心定位算法估计目标节点位置。仿真实验结果显示,提出的PCTL算法能够准确地估计PLE和目标节点位置。
