Comparative Study on Galvanic-Coupled Intrabody Channel Characteristic Measurement Methods

摘要

The galvanic-coupled intrabody communication(GCIBC)uses the human body as the channel for data transmission.The signal flow through different paths within different measure-ment schemes,resulting in distinct deviations in the experimental results.This method completely uses human body channel to transmit low-power signals,and has good anti-interference perform-ance.However,for a long time,the channel research of GCIBC has not determined a set of recog-nized and accurate measurement methods and standards.However,few researcher analyze the dif-ferences and principles between different measurement methods.This paper aims at three com-monly used measurement methods.Abstract the equivalent schematic diagrams of three measure-ment schemes:direct measurement,using high-precision differential probe and using balun.The sig-nal return paths generated by three measurement methods are analyzed,the impedance matching and energy transmission efficiency are compared.According to the analysis,the empirical expres-sions in different cases are listed.The mechanism between the channel measurement results gener-ated by the set experimental configuration and the comparison experiment is clarified.The compar-ison experiment with complete floating measurement is carried out as a reference to verify the pro-posed opinion.The measurement error caused by different experimental configurations is verified.This study can provide a reference opinions for the experimental error analysis of GCIBC research in the future,and provide suggestions for the selection of experimental configuration.