Performance Evaluation of Wireless Communications for Capsule Endoscopy

Kenichi TAKIZAWA  Takahiro AOYAGI  Kiyoshi HAMAGUCHI  

IEICE TRANSACTIONS on Communications   Vol.E94-B   No.9   pp.2488-2491
Publication Date: 2011/09/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E94.B.2488
Print ISSN: 0916-8516
Type of Manuscript: Special Section LETTER (Special Section on Information Communication Technology for Highly Reliable Human Health Care Services)
body area networks,  capsule endoscopy,  received signal strength,  

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This letter presents a performance evaluation of wireless communications applicable into a capsule endoscope. A numerical model to describe the received signal strength (RSS) radiated from a capsule-sized signal generator is derived through measurements in which a liquid phantom is used that has electrical constants equivalent to human tissue specified by IEC 62209-1. By introducing this model and taking into account the characteristics of its direction pattern of the capsule and propagation distance between the implanted capsule and on-body antenna, a cumulative distribution function (CDF) of the received SNR is evaluated. Then, simulation results related to the error ratio in the wireless channel are obtained. These results show that the frequencies of 611 MHz or lesser would be useful for the capsule endoscope applications from the view point of error rate performance. Further, we show that the use of antenna diversity brings additional gain to this application.