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Sensors 2012, 12(12), 16433-16450; doi:10.3390/s121216433
Article

Study of Channel Characteristics for Galvanic-Type Intra-Body Communication Based on a Transfer Function from a Quasi-Static Field Model

1, 1,2,†,* , 1,3, 2,4, 5, 1,2 and 2,4
Received: 22 October 2012; in revised form: 22 November 2012 / Accepted: 23 November 2012 / Published: 27 November 2012
(This article belongs to the Special Issue Body Sensor Networks for Healthcare and Pervasive Applications)
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Abstract: Intra-Body Communication (IBC), which modulates ionic currents over the human body as the communication medium, offers a low power and reliable signal transmission method for information exchange across the body. This paper first briefly reviews the quasi-static electromagnetic (EM) field modeling for a galvanic-type IBC human limb operating below 1 MHz and obtains the corresponding transfer function with correction factor using minimum mean square error (MMSE) technique. Then, the IBC channel characteristics are studied through the comparison between theoretical calculations via this transfer function and experimental measurements in both frequency domain and time domain. High pass characteristics are obtained in the channel gain analysis versus different transmission distances. In addition, harmonic distortions are analyzed in both baseband and passband transmissions for square input waves. The experimental results are consistent with the calculation results from the transfer function with correction factor. Furthermore, we also explore both theoretical and simulation results for the bit-error-rate (BER) performance of several common modulation schemes in the IBC system with a carrier frequency of 500 kHz. It is found that the theoretical results are in good agreement with the simulation results.
Keywords: Body Sensor Network (BSN); BER; channel characteristics; Intra-Body Communication (IBC); modulation scheme; quasi-static field model; transfer function Body Sensor Network (BSN); BER; channel characteristics; Intra-Body Communication (IBC); modulation scheme; quasi-static field model; transfer function
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Chen, X.M.; Mak, P.U.; Pun, S.H.; Gao, Y.M.; Lam, C.-T.; Vai, M.I.; Du, M. Study of Channel Characteristics for Galvanic-Type Intra-Body Communication Based on a Transfer Function from a Quasi-Static Field Model. Sensors 2012, 12, 16433-16450.

AMA Style

Chen XM, Mak PU, Pun SH, Gao YM, Lam C-T, Vai MI, Du M. Study of Channel Characteristics for Galvanic-Type Intra-Body Communication Based on a Transfer Function from a Quasi-Static Field Model. Sensors. 2012; 12(12):16433-16450.

Chicago/Turabian Style

Chen, Xi M.; Mak, Peng U.; Pun, Sio H.; Gao, Yue M.; Lam, Chan-Tong; Vai, Mang I.; Du, Min. 2012. "Study of Channel Characteristics for Galvanic-Type Intra-Body Communication Based on a Transfer Function from a Quasi-Static Field Model." Sensors 12, no. 12: 16433-16450.


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