Categorized Uwb on-Body Radio Channel Modeling for Wbans

Mäkelä

2019 13th International Symposium on Medical Information and Communication Technology (ISMICT)

et al. 2019

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This paper presents measurements on dynamic offbody radio channels in an ultra wideband frequency range for wireless body area network communications focusing on the human body shadowing effect. Measurements were conducted in an anechoic chamber at a bandwidth of 2-8 GHz by using a vector network analyzer. The investigation was performed at several discrete frequencies. Two planar prototype antennas were utilized (dipole and double loop). Six on-body antenna locations were applied and one off-body site. At first, ten frequencies were examined at two links, and the path loss values and standard deviations were determined. Second, all the links were considered at three discrete frequencies. The mean path losses varied between 47.6-69.4 dB, at human-pole distances on the average of 2m. The maximum recorded value was 101.7 dB. No clear difference was noted between the antennas. The usage of dipole and double loop as a link antenna pair has no remarkable effect compared to the case when all the antennas are similar. Keywords-human body shadowing effect; wireless body area network; dynamic channel; ultra wideband. I.

Section: Introductionsupporting

confidence: 57%

Measurements and Analysis on Dynamic Off-Body Radio Channels at UWB Frequencies

Mäkelä

2019 13th International Symposium on Medical Information and Communication Technology (ISMICT)

et al. 2019

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“…Wireless body area network (WBAN) channel characteristics have been under an intensive study during the recent years. Several channel models, measurement campaigns and propagation simulations have been realized to get deeper understanding of the channel propagation in the vicinity or even inside a human body [1][2][3][4][5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Impact of the Sternotomy Wires and Aortic Valve Implant on the On-Body UWB Radio Channels

Särestöniemi

2018 12th International Symposium on Medical Information and Communication Technology (ISMICT)

et al. 2018

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In this paper, the impact of the sternotomy wires and aortic valve implant on the ultra wideband (UWB) channel characteristics is studied. The evaluations are performed by calculations, measurement data analysis, and power flow simulations. The aim is to show that implants, which consist of steel, titanium, and other highly conductive materials, do have clear effect on the signal propagation even inside the tissues. This impact should be taken into account when using in-body or onbody communications devices, such as capsule endoscopes, etc.

“…In [16], it was noted that in body area channels some other distribution may model it better. We normalized the empirical PL points with respect to the fitting line in Figs.…”

Section: B Path Loss Modelmentioning

confidence: 99%

“…We normalized the empirical PL points with respect to the fitting line in Figs. 4 and 5 and fitted the normalized PLs with 17 distributions as was done in [16]. The fittings were ranked by using the second order Akaike information criteria AIC c expressed as [18] …”

Section: B Path Loss Modelmentioning

confidence: 99%

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Path loss modeling for UWB creeping waves around human body

2017 11th International Symposium on Medical Information and Communication Technology (ISMICT)

Mäkelä

et al. 2017

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Abstract-This article presents path loss models for creeping waves propagation around a human body at ultra-wideband frequency of 2-8 GHz. The results are based on measurements in an anechoic chamber using a vector network analyzer. Three antenna types are used: prototype dipole and double loop antennas together with the commercial Skycross antenna. The antennas are attached horizontally at the chest level and the waist level at in total 12 locations. Path loss values are defined from the first arriving paths of the channel impulse responses. Path loss models are developed for upper and lower horizontal body levels separately and for all available channels when also the cross channels between the levels are considered. The path loss exponents vary between 9.2-12.7 being clearly a higher result than previously reported. The double loop antenna has the lowest exponents and the commercial antenna the highest ones. No clear difference can be noted between the body and waist levels or when observing all channels. The scattering term of the path loss can be modeled with the generalized extreme value and generalized Pareto distributions.