Performance Evaluation on RSSI-Based Localization for Capsule Endoscopy Systems with 400 MHz MICS Band Signals

Daisuke ANZAI  Sho AOYAMA  Jianqing WANG  

IEICE TRANSACTIONS on Communications   Vol.E95-B   No.10   pp.3081-3087
Publication Date: 2012/10/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E95.B.3081
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Medical Information Communication Technology for Disaster Recovery and Human Health Care Support)
implant BANs,  localization,  RSSI,  

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One of promising application offered by implant body area networks (BANs) is a capsule endoscope localization system. To begin with, this paper performs finite-difference time-domain (FDTD) simulations on implant BAN propagation with a numerical human model, and investigates the propagation characteristics of implant BAN signals at 400 MHz medical implant communication service (MICS) band. Then, the paper presents a capsule endoscope localization system which utilizes only received signal strength indicator (RSSI) and two estimation methods, such as a maximum likelihood (ML) estimation method and a least squares (LS) method. Furthermore, we evaluate the two localization methods by two computer simulation scenarios. Our computer simulation results demonstrate that the ML localization can improve the location estimation accuracy as compared with the LS localization, that is, our performance comparison reveals that a careful consideration the propagation characteristics of implant BANs signals is efficient in terms of estimation performance improvement in capsule endoscope localization.