Infrared and visible links for medical body sensor networks

Lebas, C.; Sahuguède, Stéphanie; Julien-Vergonjanne, Anne; Combeau, Pierre; Aveneau, Lilian

doi:10.23919/glc.2018.8319120

Cited by 17 publications

(9 citation statements)

References 22 publications

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“…For example, the use of RF technologies may be Sensors 2021, 21, 2904 2 of 19 limited due to potential interference with sensitive devices in environments such as hospitals [9] or due to risks associated with human exposure to RF electromagnetic fields [10]. Other technologies to address these limitations such as optical wireless communications (OWC) have been recently investigated for WBSN applications for both extra-WBSN and intra-WBSN [11][12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Channel Modeling of an Optical Wireless Body Sensor Network for Walk Monitoring of Elderly

Kaba

Sahuguède

Julien-Vergonjanne

2021

Sensors

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The growing aging of the world population is leading to an aggravation of diseases, which affect the autonomy of the elderly. Wireless body sensor networks (WBSN) are part of the solutions studied for several years to monitor and prevent loss of autonomy. The use of optical wireless communications (OWC) is seen as an alternative to radio frequencies, relevant when electromagnetic interference and data security considerations are important. One of the main challenges in this context is optical channel modeling for efficiently designing high-reliability systems. We propose here a suitable optical WBSN channel model for tracking the elderly during a walk. We discuss the specificities related to the model of the body, to movements, and to the walking speed by comparing elderly and young models, taking into account the walk temporal evolution using the sliding windowing technique. We point out that, when considering a young body model, performance is either overestimated or underestimated, depending on which windowing parameter is fixed. It is, therefore, important to consider the body model of the elderly in the design of the system. To illustrate this result, we then evaluate the minimal power according to the maximal bandwidth for a given quality of service.

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Section: Introductionmentioning

confidence: 99%

Channel Modeling of an Optical Wireless Body Sensor Network for Walk Monitoring of Elderly

Kaba

Sahuguède

Julien-Vergonjanne

2021

Sensors

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“…Authors in ref. [15] use full duplex bidirectional communication supported by an infrared uplink and visible light downlink. Using a ray-tracing technique they determine the overall outage performance.…”

Section: Related Workmentioning

confidence: 99%

A Comprehensive Worst Case Bounds Analysis of IEEE 802.15.7

Kurunathan¹,

Severino²,

Tovar³

2021

JSAN

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Visible Light Communication (VLC) has been emerging as a promising technology to address the increasingly high data-rate and time-critical demands that the Internet of Things (IoT) and 5G paradigms impose on the underlying Wireless Sensor Actuator Networking (WSAN) technologies. In this line, the IEEE 802.15.7 standard proposes several physical layers and Medium Access Control (MAC) sub-layer mechanisms that support a variety of VLC applications. Particularly, at the MAC sub-layer, it can support contention-free communications using Guaranteed Timeslots (GTS), introducing support for time-critical applications. However, to effectively guarantee accurate usage of such functionalities, it is vital to derive the worst-case bounds of the network. In this paper, we use network calculus to carry out the worst-case bounds analysis for GTS utilization of IEEE 802.15.7 and complement our model with an in-depth performance analysis. We also propose the inclusion of an additional mechanism to improve the overall scalability and effective bandwidth utilization of the network.

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“…In [15], a detailed analysis of the size and shape of an obstacle on the CIR was given. In [16]- [19], the impact of the reflectivity of the human as well as the receiver orientation on the CIR and the outage probability for different data rates was measured using ray tracing. Furthermore, in [20], the effects of LOS blockage, transmitter viewing angle and the receiver aperture size on the CIR of an underwater VLC link was measured in a ray tracing simulation.…”

Section: Relationship To the State Of The Artmentioning

confidence: 99%

Characterization of Line-of-Sight Link Availability in Indoor Visible Light Communication Networks Based on the Behavior of Human Users

et al. 2020

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We characterize the line-of-sight (LOS) link availability in indoor visible light communication (VLC) networks based on the behavior of human users. The VLC link availability is impacted by humans in three distinct ways: (1) Users turn the lights on or off in each room. (2) Users may carry mobile devices. (3) Users constitute mobile obstacles that block or shadow the channel between the transmitter and the receiver. First, we develop a mathematical framework for VLC link availability and a probabilistic model of the VLC network with respect to human behavior in indoor environments. Second, we design a realistic multiuser , indoor VLC system simulation with static and mobile VLC devices that are expected to be found in smart home environments. We present the following four sets of results: (1) We report statistics on the blockage durations of VLC links and categorize the links with respect to these statistics. (2) We demonstrate the performance of Selection Diversity versus Maximal Ratio Combining for mobile VLC devices carried by humans in a smart home setting. (3) We show that optimal LED resource allocation policies for multiple users are impacted by the VLC link blockage events caused by humans. (4) We demonstrate that the link blockage events in different rooms become dependent due to humans who transition between rooms. Based on our results, we provide new directions for the design of network architectures for indoor VLC systems.

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Infrared and visible links for medical body sensor networks

Cited by 17 publications

References 22 publications

Channel Modeling of an Optical Wireless Body Sensor Network for Walk Monitoring of Elderly

Channel Modeling of an Optical Wireless Body Sensor Network for Walk Monitoring of Elderly

A Comprehensive Worst Case Bounds Analysis of IEEE 802.15.7

Characterization of Line-of-Sight Link Availability in Indoor Visible Light Communication Networks Based on the Behavior of Human Users

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