IEMEK Journal of Embedded Systems and Applications (대한임베디드공학회논문지)

Institute of Embedded Engineering of Korea (대한임베디드공학회)
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Electrostatic Coupling Intra-Body Communication Based on Frequency Shift Keying and Error Correction

FSK 통신 및 에러 정정을 통한 Intra-Body Communication

  • Received : 2020.05.18
  • Accepted : 2020.06.09
  • Published : 2020.08.31
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Abstract

The IBC (Intra-Body Communication) benefits from a wireless communication system for exchanging various kinds of digital information through wearable electronic devices and sensors. The IBC using the human body as the transmission channel allows wireless communication without the transmitting radio frequency waves to the air. This paper discusses the results of experiments on electrostatic coupling IBC based on FSK (Frequency Shift Keying) and 1 bit error correction. We implemented FSK communication and 1 bit error correction algorithm using the MCU boards and aluminum tape electrodes. The transmitter modulates digital data using 50% duty square wave as carrier signal and transmits data through human body. The receiver performs ADC (Analog to Digital Conversion) on carrier signal from human body. In order to figure out the frequency of carrier signal from ADC results, we applied zero-crossing algorithm which is used to detect the edge characteristic in computer vision. Experiment results shows that digital data modulated as square wave can be successfully transmitted through human body by applying the proposed architecture of a 1ch GPIO as a transmitter and 1ch ADC for as a receiver. Also, this paper proposes 1 bit error correction technique for reliable IBC. This technique performs error correction by utilizing the feature that carrier signal has 50% duty ratio. When 1 bit error correction technique is applied, the byte error rate at receiver side is improved around 3.5% compared to that not applied.

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References

  1. Hyung-Bong Lee, Sung-Wook Park, Tae-Yun Chung, "Development of a Portable SpO2-based Biosignal Monitoring System," IEMEK J. Embed. Sys. Appl., Vol. 8, No. 5, pp. 273-283, 2013 (in Korean)
  2. T. G. Zimmerman, "Personal Area Networks (PAN): Near-Field Intra-Body Communication", M. S. thesis, MIT Media Laboratory, 1995.
  3. Thomas. G. Zimmerman, "Personal Area Network Near-Field Intrabody Communication", IBM Systems Journal, Vol. 35, No. 3&4, pp. 609-617, 1996. https://doi.org/10.1147/sj.353.0609
  4. R. Xu, H. Zhu, J. Yuan, "Characterization and Analysis of Intra-body Communication Channel," in Proc. IEEE Antennas Propag. Soc. Int. Symp., 2009, pp. 1-4.
  5. J. H. Hwang, J. B. Sung, C. H. Hyoung, J. K. Kim, D. G. Park, S. W. Kang, "Analysis of Signal Interference in Human Body Communication Using Human Body as Transmission Medium," in Proc. Antennas Propag. Soc. Int. Symp., 2006, pp. 495-498.
  6. S. Shimamoto, A. M. Alsehab, N. Kobayashi, D. Dovchinbazar, J.A. Ruiz, "Future Applications of Body Area Communications," In Proc. 6th Int. Conf. Inf., Commun. SignalProc., 2007, pp. 1-5.
  7. K. Hachisuka, A. Nakata, T. Takeda, Y. Terauchi, K. Shiba, K. Sasaki, H. Hosaka, K. Itao, "Development and Performance Analysis of an Intra-body Communication Device," in Int. Solid-State Sens., Actuators, Microsyst. Conf., Jun. 2003, pp. 1722-1725
  8. M. Shinagawa, M. Fukumoto, K. Ochiai, H. Kyuragi, “A Nearfield-sensing Transceiver for Intra-body Communication Based on the Electro-optic Effect,” IEEE Trans. IM, Vol. 53, No. 6, pp. 1533-1538, 2004.
  9. S.-J. Song, N. Cho, H.-J. Yoo, “A 0.2-mW 2-Mb/s Digital Transceiver Based on Wideband Signaling for Human Body Communications,” IEEE J. Solid-State Circuits, Vol. 42, No. 9, pp. 2021-2033, 2007. https://doi.org/10.1109/JSSC.2007.903080
  10. H. Cho, H. Lee, J. Bae, H.-J. Yoo, “A 5.2mW IEEE 802.15.6 HBC Standard Compatible Transceiver with Power Efficient Delay-locked-loop Based BPSK Demodulator,” IEEE J. Solid-State Circuits, Vol. 50, No. 11, pp. 2549-2559, 2015. https://doi.org/10.1109/JSSC.2015.2475179