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Institute of Korean Electrical and Electronics Engineers (한국전기전자학회)
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Analysis of Human Body Channel Based on Impulse Response Signals

임펄스 응답 신호를 이용한 인체 채널 분석

  • Kang, Taewook (Electronics and Telecommunications Research Institute and Dept. of Radio and Information Communications Engineering, Chungnam National University) ;
  • Lee, Jae-Jin (Electronics and Telecommunications Research Institute) ;
  • Oh, Wangrok (Dept. of Radio and Information Communications Engineering, Chungnam National University)
  • Received : 2022.02.12
  • Accepted : 2022.03.22
  • Published : 2022.03.31
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Abstract

This study presents an analysis of the human body channel as an electric signal path using body impulse response (BIR). The human body communications (HBC) has recently emerged as an effective signal transmission method to create wireless body area networks (WBAN). We provide body channel characteristics based on measured BIR in a proper experimental environment for the HBC using capacitive coupling with a customized channel sounding device, which can be applied as a guideline for the HBC system design. The frequency response of the BIR, extracted by a customized signal processing for the measure signals, shows the channel path loss (CPS) between 0 MHz and 100 MHz with an average CPS of approximately 46.8 dB. In addition, the relative noise power distributions can provide estimations on the signal to noise ratio at the HBC receiver in terms of capacitor and resistor values in the measured frequency band and the frequency band lower than 3 MHz considering the baseband signal detection.

본 연구에서는 전기 신호 경로로서의 인체 채널에 대해 임펄스 응답 신호를 이용한 분석 결과를 제시한다. 최근, 인체 통신(human body communications)은 착용형 또는 임플란트형 센서 디바이스 간의 통신 방법으로 인체 영역 통신망(wireless body area networks)을 구성하는 효과적인 접근방법으로 제시되고 있다. 인체 통신 시스템 설계에 중요한 지침인 인체 채널 특성 제공을 위해, 자체 제작한 채널 응답측정장치를 사용하고 용량성 커플링(capacitive coupling) 특성에 적합한 실험환경을 구축하여 측정을 수행하고 그 분석한 결과를 제시한다. 측정 신호에 대한 신호처리 과정으로 임펄스 응답을 효과적으로 추출하여, 0 MHz에서 100 MHz 사이의 주파수 분석을 통해 평균 경로 손실 약 46.8 dB를 제시하고 주파수별 경로 손실 특성을 확인할 수 있다. 또한, 본 연구는 인체 통신 시스템의 수신기 신호 대 잡음비(signal-to-noise ratio) 예측을 위한 수신기 필터의 커패시터와 저항값 변화에 따른 전체 측정 주파수와 기저 대역 신호의 검출 성능 결정에 영향을 주는 3 MHz 이하 대역에서의 상대적인 잡음 전력을 제시하였다.

Keywords

Acknowledgement

This work was supported by Electronics and Telecommunications Research Institute (ETRI) grant funded by the Korea government. [22ZB1100, Development of Creative Technology for ICT].

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