ETRI Journal

  • 제37권3호
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  • Pages.637-645
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  • 2015
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  • 1225-6463(pISSN)
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  • 2233-7326(eISSN)
한국전자통신연구원 (Electronics and Telecommunications Research Institute)
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Enhanced Common-Mode Noise Rejection Method Based on Impedance Mismatching Compensation for Wireless Capsule Endoscopy Systems

  • Hwang, Won-Jun (Samsung Electronics Co. Ltd.) ;
  • Kim, Ki-Yun (Department of Information and Engineering, Myongji College) ;
  • Choi, Hyung-Jin (College of Information and Communication Engineering, Sungkyunkwan University)
  • 투고 : 2014.11.14
  • 심사 : 2015.02.11
  • 발행 : 2015.05.01
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초록

Common-mode noise (CMN) is an unresolved problem in wireless capsule endoscopy (WCE) systems. In a WCE system, CMN originates from various electric currents found within the human body or external interference sources and causes critical demodulation performance degradation. The differential operation, a typical method for the removal of CMN rejection, can remove CMN by subtracting two signals simultaneously received by two reception sensors attached to a human body. However, when there is impedance mismatching between the two reception sensors, the differential operation method cannot completely remove CMN. Therefore, to overcome this problem, we propose an enhanced CMN rejection method. The proposed method performs not only subtraction but also addition between two received signals. Then a CMN ratio can be estimated by sufficient accumulation of division operation outcomes between the subtraction and addition outputs during the guard period. Finally, we can reject the residual CMN by combining the subtraction and addition outputs.

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참고문헌

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피인용 문헌

  1. 캡슐내시경을 위한 HBC시스템 구현 vol.18, pp.3, 2018, https://doi.org/10.7236/jiibc.2018.18.3.215
  2. Low-Power, High Data-Rate Digital Capsule Endoscopy Using Human Body Communication vol.8, pp.9, 2015, https://doi.org/10.3390/app8091414