Numerical Channel Characterizations for Liver-Implanted Communications Considering Different Human Subjects

Pongphan LEELATIEN  Koichi ITO  Kazuyuki SAITO  Manmohan SHARMA  Akram ALOMAINY  

IEICE TRANSACTIONS on Communications   Vol.E102-B    No.4    pp.876-883
Publication Date: 2019/04/01
Publicized: 2018/10/22
Online ISSN: 1745-1345
DOI: 10.1587/transcom.2018EBP3050
Type of Manuscript: PAPER
Category: Antennas and Propagation
body area network,  implantable biomedical devices,  path loss model,  propagation,  ultra-wideband (UWB),  wireless biotelemetry,  

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This paper presents a numerical study of the wireless channel characteristics of liver implants in a frequency range of 4.5-6.5GHz, considering different digital human phantoms by employing two inhomogeneous male and female models. Path loss data for in-body to on-body and in-body to off-body communication scenarios are provided. The influence of respiration-induced organ movement on signal attenuation is demonstrated. A narrower range of attenuation deviation is observed in the female model as compared to the male model. The path loss data in the female body is between 40-80dB which is around 5-10dB lower than the male model. Path loss data for the in-body to off-body scenario in both models suggest that in-body propagation is the main component of total path loss in the channel. The results demonstrate that channel characteristics are subject dependent, and thus indicate the need to take subject dependencies into consideration when investigating in-body communication channels.