Andrea Sani's research while affiliated with Queen Mary, University of London and other places

Publications (27)

Article
Full-text available
The paper presents a subject-specific radio propagation study and system modeling in wireless body area networks using a simulation tool based on the parallel finite-difference time-domain technique. This technique is well suited to model the radio propagation around complex, inhomogeneous objects such as the human body. The impact of different dig...
Article
This letter investigates the effect of body movements on the ultrawideband (UWB) on-body radio channel. A measurement campaign was performed considering four different body-links, namely: belt-to-head, belt-to-chest, belt-to-wrist, and belt-to-ankle, with the subject performing movements of different nature, in order to cover a wide range of scenar...
Article
Given the trend towards a user-centric concept in mobile communications, body area networks have received increasing attention within the wireless personal and body area networks community. In this paper, an experimental investigation is presented to derive suitable radio propagation models for ultra wideband (UWB) body-centric wireless communicati...
Article
The paper presents radio propagation study in wireless body area networks using a simulation tool based on the parallel finite-difference time-domain technique. This technique is well suited to model the radio propagation around complex, inhomogeneous objects such as the human body. The impact of different postures in on-body radio channel was stud...
Article
Radio-frequency identification (RFID) is a growing technology, with the potential for reducing medical errors and improving the quality of healthcare in hospitals. The benefits include more secure and safe access in the healthcare environment (with the possibility, for example, to track patients, personnel, and equipment), as well as providing the...
Conference Paper
With the development of miniaturized wireless wearable and implantable medical devices, pervasive monitoring is becoming a clinical reality. With an increasing drive for minimizing power utilization, optimal antenna design and radio wave propagation are important topics for BSN (body sensor networks) research. To this end, subject-specific modeling...
Conference Paper
This paper presents numerical investigations of various body-worn antennas and their characteristics when placed at different positions on the body in the band 100–1000 MHz. The parametric study conducted includes the use of multiple elements placed at various locations on the body to investigate the effect of diversity on increasing antenna covera...
Conference Paper
Ultra wide-band (UWB) is an appealing technology for wireless body area networks (WBANs). The paper presents the numerical analysis of the subject-specificity of the radio channel in UWB-WBANs adopting the finite difference time domain technique. The analysis has been performed in the frequency range 3–10 GHz considering nine homogeneous digital ph...
Article
An experimental investigation to characterize the transient and spectral behavior of the ultrawideband (UWB) on-body radio propagation channel for body-centric wireless communications is presented. The measurements were performed considering over thirty on-body links in the front of human body in the anechoic chamber, and in indoor environment. Two...
Conference Paper
Given the trend towards a user-centric concept in mobile communications, body area networks have received increasing attention within the wireless personal area community. Ultra wideband (UWB) radio channel propagation model with the inclusion of dynamic body environment is derived and applied to investigate the performance of potential radio syste...
Conference Paper
Full-text available
This paper presents experimental investigation of ultra wideband on-body radio channel in both the anechoic chamber and indoor environments including effects of time varying movements of various body parts on the the channel characteristics. Measured data are used to extract radio propagation channel parameters and investigate the influence of body...
Conference Paper
This paper presents a study of subject-specific radio channels in wireless body area networks (WBANs). The simulation tool is based on a parallel finite-difference time-domain method (FDTD) and is well suited to model radio propagations around complex, inhomogeneous objects including human bodies in WBAN. It is found from our study that radio chann...
Article
This paper presents a numerical investigation of the radiation characteristics of gastric, bladder, and cardiac implants based on the finite-differences time-domain method. Simulations were performed at the medical implanted communication services (MICS) and the industrial, scientific, and medical radio bands, respectively, using three different di...
Article
This paper presents the characterization of the path loss in ultrawide band body area networks. A Measurement campaign was performed in the anechoic chamber and in an indoor environment for comparison. The propagation along the front part of the body was analyzed, and the effect of the body movements on the signal strength was investigated. The res...
Conference Paper
Full-text available
The aim of this paper is to characterize the amount of power absorbed from the body tissues regardless of the antenna type. Furthermore, the efficiency of an implanted source is subject-specific; and it depends from the body size and composition. To the knowledge of the authors, the effect of different human subjects on the efficiency has not been...
Conference Paper
This paper presents a simulation environment, based on the parallel finite-difference time-domain (FDTD) method, for subject-specific radio channel modeling in wireless body sensor networks (WBSNs). The simulation environment takes into account realistic antenna radiation patterns in channel modeling to analyze their effects on WBSNs. The proposed...
Conference Paper
Body area networks consist of a number of sensor placed in proximity or inside the human body. The paper presents a simulation environment based on the finite-difference time-domain (FDTD), for radio propagation modelling of body-centric wireless devices. The proposed numerical tool has been applied to characterize the body losses in implanted devi...
Article
This paper presents transient characterization of ultrawideband (UWB) body-worn antennas and on-body radio propagation channels for body-centric wireless communications. A novel miniaturized CPW-fed tapered slot antenna is proposed and used for transient measurements of UWB radio channels for body area network (BAN) and personal area network (PAN)...
Article
Full-text available
In this paper, on body antenna performance and its effect on the radio channel is analyzed. An efficient numerical technique based on the finite-difference time-domain technique and the equivalence principle is developed. The proposed technique begins with the problem decomposition by separately computing the wearable antennas and on body propagati...
Conference Paper
This paper presents numerical investigation of the radiation performance from stomach, bladder and heart implanted wireless sources using the finite-differences time-domain (FDTD). Simulations were performed at the medical implanted communication systems (MICS) frequency of 402 MHz, using two male and one female digital body phantoms. Azimuthal rad...
Conference Paper
This paper presents the effect of the indoor environment in the UWB on-body radio channel. A measurement campaign was performed in the anechoic chamber and in an indoor environment for comparison. The propagation along the front part of the body and around the trunk are analyzed. Path loss model, time delay parameters and pulse fidelity are extract...
Conference Paper
The effect of human body and indoor environment in the ultra wide band (UWB) radio propagation channel is presented. Time domain measurements are performed in the body-centric wireless sensor laboratory, Queen Mary, University of London. In order to characterize the on-body radio channel, the transmitter has been placed on the belt, and the receive...
Conference Paper
The increase percentage of ageing population in the world, specifically western Europe and United States, is pushing academical and industrial researchers and developers to source out and provide efficient and reliable technologies for healthcare applications such as remote monitoring and drug-delivery. The paper presents transient characterisation...
Conference Paper
This paper presents a numerical technique based on finite-difference time-domain (FDTD) and equivalence principle, to evaluate the on-body antenna radiation pattern distortion. With the FDTD method is very easy to model stratified dielectric objects like the human body, but to model antenna and human body together, the high resolution needed to mod...
Conference Paper
In this paper a hybrid method for modelling on-body propagation channel has been presented. The original problem is split into two sub-domains: the antenna is analyzed with the commercial software CST, while the human body is handled with the FDTD; the equivalence principle is used as interface between the two sub-domains. The method has been appli...
Conference Paper
The effect of human body and indoor environment in the ultra wideband (UWB) radio propagation channel is presented. Measurements were performed in the frequency domain, and the effect of two different antenna types on the radio channel is analyzed. Statistical path loss parameters and time domain channel characteristics [pulse fidelity] are extract...

Citations

... In [7][8][9][10][11][12][13][14], on-body radio channel characterisation was presented at the unlicensed frequency band of 2.45 GHz. UWB on-body radio propagation channel characterisation for body-centric wireless networks have been presented extensively in the open literature [15][16][17][18][19][20][21][22][23][24][25][26][27]. However, the sizes and shapes of the different human bodies will affect the propagation path and lead to different system performances. ...
... Recently, wearable antennas have received growing interest due to the introduction of personal and body-centric networks communications technology [2][3][4][5][6][7][8]. Therefore, additional factors and scenarios must be considered for SAR compliance testing since the antenna is worn closely to human body. ...
... However, the coaxial cable connecting antenna and VNA can often introduce error, due to unwanted radiation from currents flowing on the outer surface of the cable, as well as errors from cable movements. Alternative techniques have been explored to mitigate this 'cable effect', including the use of fibre-optic systems (see, for example, [5]; also [6][7][8] Fibre-optic cables are essentially immune to electromagnetic interference (EMI) and radio frequency interference (RFI), which have a major impact on traditional on-body measurements (VNA and coaxial cables). In [9], off-body measurements were performed in an anechoic chamber and indoor environment using a fibre-optic system on a motionless test subject. ...
... In the figure, a appears as the separation between the proposed antenna (broadcast antenna element) and the given half wave (λ /2) dipole antenna construction (i.e., receiver antenna). In the figure [27,28,29] is the proposed distance of 1 m, γ is the basic free space wavelength computed at 24 GHz, and Xσ is the shadowing parameter for Gaussian distribution with a standard deviation of σ, 1.0. We make the supposition that the antenna is built on the human body and the transmitting power denoted by (Pt) will be seen as 10 and 27 dBm. 2 dBi is chosen as the gain of the receiving antenna (G ra ). ...
... In-to-out body communication is an active research topic, and important previous work was performed by many research groups. A detailed analysis of wave propagation and radiation efficiency in different human tissues (such as lungs, stomach, liver, heart, skin, and muscle), at different frequencies (402 MHz, 868 MHz, and 2.45 GHz) is presented in [30][31][32][33]. A number of advantages of using the 2.45 ISM band instead of the 402-405 MICS band are described in [31]. ...
... When the radio wavelength is considerably greater than the cross-section of the body the resultant attenuation is low, however it becomes significant at gigahertz frequencies. In that case choosing radio propagation channel models for BAN is difficult because expected values of path loss through the body are high (up to about 90 dB) and may be critical for the proper operation of the network [2,3]. An in-depth simulation based analysis of the coupling between body mounted antennas using computational electrodynamics methods, such as the finite difference time domain (FDTD) method and numerical phantoms, can be found in literature, e.g., [4][5][6][7]. ...
... Over the years, many aspects of the UWB BCWC have been thoroughly documented in both stochastic and experimental realms [4][5][6][7][8][9][10][11][12][13][14]. The parameter that has been estimated by various research groups for UWB channel modeling is the channel impulse response (CIR), a direct figure of merit for time domain analysis that is the indelible feature of any ultrawideband system [8,13]. ...
... It is possible to use implantable antennas for wireless power transfer in addition to biotelemetry [35]. Radiation performance of sources implanted in the stomach, bladder and heart have been compared in [36].Other types of PIFAs have been considered (e.g. [37][38]). ...
... In [7][8][9][10][11][12][13][14], on-body radio channel characterisation was presented at the unlicensed frequency band of 2.45 GHz. UWB on-body radio propagation channel characterisation for body-centric wireless networks have been presented extensively in the open literature [15][16][17][18][19][20][21][22][23][24][25][26][27]. However, the sizes and shapes of the different human bodies will affect the propagation path and lead to different system performances. ...
... In this work, one should note that the a posteriori knowledge regarding propagation models plays an important role in the selection of parametric models. In [7], three different planar body-worn narrowband antennas were compared; different coefficients for the parametric models were observed. It is found that the ground plane of the antennas and the antenna radiation pattern would affect the on-body propagation to some extent; however, it should be noted that more factors could be included (e.g., non-line-ofsight propagation path) to generalize the propagation model. ...