UWB in-body channel performance by using a direct antenna designing procedure

2018 IEEE Wireless Communications and Networking Conference Workshops (WCNCW)

et al. 2018

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Localization inside the human body using ultrawideband (UWB) wireless technology is gaining importance in several medical applications such as capsule endoscopy. Performance analysis of RF based localization techniques are mainly conducted through simulations using numerical human models or through experimental measurements using homogeneous phantoms. One of the most common implemented RF localization approaches uses the received signal strength (RSS). However, to the best of our knowledge, no experimental measurements employing multilayer phantoms are currently available in literature. This paper investigates the performance of RSS-based technique for two-dimensional (2D) localization by employing a two-layer experimental phantom-based setup. Preliminary results on the estimation of the in-body antenna coordinates show that RSS-based method can achieve a location accuracy on average of 0.5-1 cm within a certain range of distances between in-body and on-body antenna.

Section: Measurement Setup and Methodologymentioning

confidence: 99%

Localization for capsule endoscopy at UWB frequencies using an experimental multilayer phantom

Barbi

Perez-Simbor

2018 IEEE Wireless Communications and Networking Conference Workshops (WCNCW)

et al. 2018

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“…Regarding the antennas, two quasi-omnidirectional antennas are used for the measurements. Concretely, the on-body antenna is a patch antenna of 4 cm × 4.4 cm for the length and width [8] and the in-body antenna is a CPW antenna of 2 cm × 2.3 cm length and width [9]. Finally, the measurements are performed with a vector network analyzer (VNA).…”

Section: A Experimental Setupmentioning

confidence: 99%

Initial Delay Domain UWB Channel Characterization for In-Body Area Networks

Perez-Simbor

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

Cardona

2019

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Wireless Body Area Networks (WBANs) have increased the attention of the research community for the next generation wireless medical devices. Among others, Wireless Capsule Endoscopy (WCE) aims to transmit better quality images. For this, the Ultra Wideband (UWB) frequency band is becoming a good alternative to currently allocated frequencies for in-body networks, allowing higher data rate and having a low power transmission. Common channel characterization in WBANs are performed in frequency domain, i.e., analyzing the received power as a function of frequency. Nevertheless, indepth studies in delay domain analyzing the impulse response of the channel are barely considered in current literature. In this paper, an initial study in delay domain, i.e., the Power Delay Profile (PDP) characteristics, is performed. Moreover, a comparison between the channel response in frequency and delay domain is performed. This work gives an insightful view of the impulse response of the channel for in-body to on-body communications. For that, an extensive campaign of phantom measurements and software simulations are conducted.

“…In order to characterize the available radio channel performance provided by UWB, new optimization and miniaturization techniques should be used to obtain reliable antenna candidates. The use of direct optimization procedures at the initial antenna designing stage [126] profits from the human tissue properties for antenna miniaturization. Fig.…”

Section: A Antennas For Uwb In-body Communicationsmentioning

confidence: 99%

“…7. Radiation pattern of an implanted antenna at UWB frequencies by using antenna miniaturization procedure [127].…”

Section: A Antennas For Uwb In-body Communicationsmentioning

confidence: 99%

Ultrawideband Technology for Medical In-Body Sensor Networks: An Overview of the Human Body as a Propagation Medium, Phantoms, and Approaches for Propagation Analysis

IEEE Antennas Propag. Mag.

Andreu

Fornés-Leal

et al. 2018

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In-body sensor networks are those networks where at least one of the sensors is located inside the human body. Such wireless in-body sensors are mainly used for medical applications, collecting and monitoring important parameters for health and diseases treatment. The IEEE Standard 802.15.6-2012 for Wireless Body Area Networks (WBAN) considers in-body communications in the Medical Implant Communication Service (MICS) band. Nevertheless, high data rate communications are not feasible at the MICS band due to its narrow occupied bandwidth. In this framework, Ultra-Wideband (UWB) systems have emerged as a potential solution for in-body high data rate communications, due to its miniaturization capabilities or low power consumption. In the last years, some open issues have determined the research about in-body propagation. Firstly, the propagation medium, i.e., the human body tissues, is frequencydependent and exhibits a large attenuation at UWB frequencies. Secondly, the behavior of the in-body antennas is highly dominated by the surrounding tissues. Thus, the in-body channel characterization in UWB depends not only on the channel behavior itself, but also on the methodology of characterization. This paper intends to outline the research performed in the field of UWB in-body radio channel characterization considering the propagation medium, as well as the methodology of analysissoftware simulations, phantom measurements, in vivo measurements-. Thus, authors provide an overall perspective of the current state of the art, limitations for the analysis of in-body propagation, and future perspectives for UWB in-body channel analysis.