In this paper, we present an accurate and realistic simulation for body area networks (BAN) and body-to-body networks (BBN) using deterministic and semi-deterministic approaches. First, in the semi-deterministic approach, a real-time... more
In this paper, we present an accurate and realistic simulation for body area networks (BAN) and body-to-body networks (BBN) using deterministic and semi-deterministic approaches. First, in the semi-deterministic approach, a real-time measurement campaign is performed, which is further characterized through statistical analysis. It is able to generate link-correlated and time-varying realistic traces (i.e., with consistent mobility patterns) for on-body and body-to-body shadowing and fading, including body orientations and rotations, by means of stochastic channel models. The full deterministic approach is particularly targeted to enhance IEEE 802.15.6 proposed channel models by introducing space and time variations (i.e., dynamic distances) through biomechanical modeling. In addition, it helps to accurately model the radio link by identifying the link types and corresponding path loss factors for line of sight (LOS) and non-line of sight (NLOS). This approach is particularly importa...
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International audienceDans cet article, nous présentons un modèle de réseau de neurones (Neural Network, RN) s'appuyant sur une recherche d'architecture neuronale (Neural Architecture Search, NAS) et d'auto-apprentissage, que... more
International audienceDans cet article, nous présentons un modèle de réseau de neurones (Neural Network, RN) s'appuyant sur une recherche d'architecture neuronale (Neural Architecture Search, NAS) et d'auto-apprentissage, que nous appliquonsà la reconstruction instantanée de cartes de puissances radio (Received Signal Strength, RSS)à partir de mesures parcimonieuses, dans le cas où l'augmentation de données par des techniques de simulation déterministe n'est pas possible. Dans cette approche, nous déterminons tout d'abord une architecture NN optimale tout en entrainant conjointement le model déduità partir d'une carte RSSreprésentant la vérité terrain. Cette carte de référence ainsi que les prédictions du modèle appliquéà un ensemble de point choisis aléatoirement sont ensuite utilisés pour entrainer un second modèle NN utilisant une architecture identique. Des résultats expérimentauxétablis sur cinq cartesà grandeéchelle montrent que les prédictions de c...
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62 REE N°5/2013 L’ULTRA LARGE BANDE IMPULSIONNELLE Benoit Denis, Francois Dehmas, Michael Pelissier, Laurent Ouvry CEA-Leti Minatec Introduction Dans une perspective d’optimisation energetique ou de perfectionnement ergonomique, la... more
62 REE N°5/2013 L’ULTRA LARGE BANDE IMPULSIONNELLE Benoit Denis, Francois Dehmas, Michael Pelissier, Laurent Ouvry CEA-Leti Minatec Introduction Dans une perspective d’optimisation energetique ou de perfectionnement ergonomique, la gestion locale de l’information ainsi que les applications nomades centrees sur l’utilisateur sont aujourd’hui deux tendances de fond de la nouvelle ere nume- rique. L’evolution recente des systemes RFID et des memoires tend, par exemple, a favoriser la distribu- tion spatiale des contenus et le stockage local des donnees, interrogeables « a la demande » dans leur voisinage physique immediat (sans recours a des ressources distantes centralisees, plus energivores). L’emergence de technologies propres a l’Internet des Objets (IoT : Internet of Things) ou aux villes intelli- gentes, est dopee par une demande croissante en matiere d’integration, d’autonomie et de mobilite : nombre d’applications topo-dependantes ou geo- referencees commencent ainsi a voir le jour. Emerge egalement le besoin de fonctions conjointes de « geolocalisation » et de communica- tion au sein d’environnements jusque-la de
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Political Science and REE
5G radio localization at millimeter wave (mmWave) and sub-THz frequencies exploits information via both angle and delay measurements, by the virtue of increased bandwidth and large antenna arrays. When large arrays are embedded in... more
5G radio localization at millimeter wave (mmWave) and sub-THz frequencies exploits information via both angle and delay measurements, by the virtue of increased bandwidth and large antenna arrays. When large arrays are embedded in surfaces, they can passively steer electromagnetic waves in preferred directions of space or generate shaped beams. Reconfigurable intelligent surfaces (RISs), which are seen as a transformative "beyond 5G" technology, can, thus, control the physical propagation environment. Whereas such RISs have been mainly intended for communication purposes so far, we herein state and analyze a RIS-aided localization and mapping problem.
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This paper describes a low computational complexity semi-deterministic Inter-Cell Interference (ICI) map construction procedure. The built Interference Map (IM) gives the ICI level at each pixel of a two-dimensional area, based on an... more
This paper describes a low computational complexity semi-deterministic Inter-Cell Interference (ICI) map construction procedure. The built Interference Map (IM) gives the ICI level at each pixel of a two-dimensional area, based on an initialization map and ICI levels measured by collaborative User Equipments (UEs). In a first step, the initialization map is obtained with an analytical location-dependent ICI prediction model based on the Poisson Point Process (PPP) framework, where a priori deterministic information about the indoor/outdoor UE status can be injected. The analytical interference map is then updated following a self-learning approach, after spatially interpolating the gap sensed by the UEs with respect to analytical predictions in their visited positions. Two conventional spatial interpolation techniques are thus considered under regular and irregular sensing grids: Inverse Distance Weighting (IDW) and kriging, where exponential and Von Karman variograms are used. In o...
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As wireless ad hoc and mobile networks are emerging and the transferred data become more sensitive, information security measures should make use of all the available contextual resources to secure information flows. The physical layer... more
As wireless ad hoc and mobile networks are emerging and the transferred data become more sensitive, information security measures should make use of all the available contextual resources to secure information flows. The physical layer security framework provides models, algorithms, and proofs of concept for generating pairwise symmetric keys over single links between two nodes within communication range. In this study, we focus on cooperative group key generation over multiple Impulse Radio - Ultra Wideband (IR-UWB) channels according to the source model. The main idea, proposed in previous work, consists in generating receiver-specific signals, also called s-signals, so that only the intended receiver has access to the non-observable channels corresponding to its non-adjacent links. Herein, we complete the analysis of the proposed protocol and investigate several signal processing algorithms to generate the s-signal expressed as a solution to a deconvolution problem in the case of...
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Computer Science, Cross Correlation, UWB communication, Impulse Radio, Maximum Likelihood Estimation, and 10 moreDirection of Arrival Estimation, Context Aware, UWB antenna, Indoor Environment, Ultra Wideband, Wireless Sensor Network, Ultra Wideband Antennas, Time of Arrival, Indoor communication, and Ultra wide band
Abstract This paper presents an algorithm that interprets the waveforms associated with received mutipath components in order to estimate their Direction of Arrival (DoA), Direction of Departure (DoD) and Incident Angle to the Indoor... more
Abstract This paper presents an algorithm that interprets the waveforms associated with received mutipath components in order to estimate their Direction of Arrival (DoA), Direction of Departure (DoD) and Incident Angle to the Indoor Surface (IAIS) in the context of Impulse Radio-Ultra Wide Band (IR-UWB) communications. The proposed solution combines a deterministic description of the filtering effects of antennas and materials with a simple statistical model for IAIS. Iteratively, a set of jointly estimated path parameters is chosen ...
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ABSTRACT
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Popular linearized estimators such as the Extended Kalman Filter (EKF) or the one-step linearized Least Squares (LS) estimator, which have been used for years to solve positioning and tracking problems in location-enabled wireless... more
Popular linearized estimators such as the Extended Kalman Filter (EKF) or the one-step linearized Least Squares (LS) estimator, which have been used for years to solve positioning and tracking problems in location-enabled wireless networks, require that available observations are locally linearized (as functions of estimated variables) around the predicted state or initial optimization guess. In most of practical cases however,
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Skip to Main Content. IEEE.org | IEEE Xplore Digital Library | IEEE Standards Association | Spectrum Online | More IEEE Sites. IEEE Xplore Digital Library. Search Term(s). Advanced Search | Preferences | Search Tips. ...
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... all the addressable slot indexes in the observation window (eg after coarse temporal synchronization), then the Maxi-mum A Posteriori (MAP) and the ... [10] A. Rabbachin, I. Oppermann, and B. Denis, GML ToA Estima-tion Based on Low... more
... all the addressable slot indexes in the observation window (eg after coarse temporal synchronization), then the Maxi-mum A Posteriori (MAP) and the ... [10] A. Rabbachin, I. Oppermann, and B. Denis, GML ToA Estima-tion Based on Low Complexity UWB Energy Detection ...
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Abstract This paper presents an algorithm that enables anchor-less localization for pairs of static Impulse Radio-Ultra Wide Band (IR-UWB) devices in a room. The estimation progresses through a tree, as the most significant received paths... more
Abstract This paper presents an algorithm that enables anchor-less localization for pairs of static Impulse Radio-Ultra Wide Band (IR-UWB) devices in a room. The estimation progresses through a tree, as the most significant received paths are successively considered. Unlikely path parameters estimates are progressively rejected, relying on cross-correlation (ie with respect to predicted waveforms), as well as on a Maximum Averaged Likelihood (MAL) criterion. The latter is based on the measurements of Angle of Incidence ...
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Page 1. AbstractThis paper details the Medium Access Control (MAC) layer designed in the PULSERS project for Low Data Rate (LDR) systems, whose main features are low power consumption, low complexity location and relaying capabilities. ...
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Page 1. Abstract In this paper, we present a low-complexity Low Data Rate (LDR) Ultra Wideband (UWB) demonstration platform suitable for services based on Location and Tracking (LT). This prototyping platform tends to ...
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ABSTRACT In this paper we consider adapting links selection criteria to assist the localization of Mobile Terminals in heterogeneous and cooperative wireless networks. Integrating asynchronously the velocity and location estimates of... more
ABSTRACT In this paper we consider adapting links selection criteria to assist the localization of Mobile Terminals in heterogeneous and cooperative wireless networks. Integrating asynchronously the velocity and location estimates of neighboring terminals in a performance indicator based on a Cramer Rao Lower Bound, one can reliably anticipate on the instantaneous location estimation errors that would be committed along mobile trajectories, while experiencing limited connectivity. This new dynamic indicator is thus helpful to predict in a reasonably short-term the most relevant combination of range measurements, for instance based on Received Signal Strength Indicators, with respect to other neighboring mobile terminals over peer-to-peer links. The idea is to limit in turn power consumption, computational complexity and latency, for instance by postponing as much as possible a complete refreshment of the serving neighbors. Coupling further this selection scheme with a decentralized and cooperative Extended Kalman Filter, simulation results are provided in a realistic dynamic heterogeneous indoor context, including fixed WiFi Access Points and multi-standard WiFi/Zigbee mobile terminals under pedestrian mobility.
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In this paper, we evaluate the performance of impulse radio-ultra wideband (IR-UWB) communications at the physical layer (PHY) level in a multi-user low data rate (LDR) context. Focusing more specifically on the IEEE 802.15.4a standard,... more
In this paper, we evaluate the performance of impulse radio-ultra wideband (IR-UWB) communications at the physical layer (PHY) level in a multi-user low data rate (LDR) context. Focusing more specifically on the IEEE 802.15.4a standard, this study aims at characterizing and quantifying the potential interference effects resulting from simultaneous competing transmissions. For the sake of simplicity, we deliberately restrict the
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Page 1. Abstract This paper presents an analytical comparison of three modulation schemes applied to two Low Data Rate (LDR) Ultra Wideband (UWB) non-coherent receivers, namely the quadratic detector and the differential detector. ...
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ABSTRACT This paper addresses the problem of navigation in cooperative groups of Wireless Body Area Networks. On-body radio devices determine their position by estimating their distance to other nodes from the measurement of the Round... more
ABSTRACT This paper addresses the problem of navigation in cooperative groups of Wireless Body Area Networks. On-body radio devices determine their position by estimating their distance to other nodes from the measurement of the Round Trip Time Of Flight of Impulse Radio-Ultra Wideband signals. The nodes not only measure their distance to fixed anchors, but also use device-to-device measurements, which improves spatial diversity and redundancy yielding to a better localization accuracy and robustness. However, such measurements are easily biased by line-of-sight conditions and body shadowing. We propose to apply a biased version of the extended Kalman filter to alleviate the effect of measurement biases in Non Line Of Sight (NLOS) conditions and combine this filter with an NLOS detection mechanism from the literature and evaluate, by simulation, the achieved gain.
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Page 1. Abstract In this paper, we show that the Distributed Maximum Log-Likelihood (DMLL) algorithm, which was originally proposed in [10] as a positioning solution for Ultra Wideband (UWB) indoor ad hoc networks, exhibits fine... more
Page 1. Abstract In this paper, we show that the Distributed Maximum Log-Likelihood (DMLL) algorithm, which was originally proposed in [10] as a positioning solution for Ultra Wideband (UWB) indoor ad hoc networks, exhibits fine flexibility. ...
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In this paper, we present an UWB positioning experiment performed in a typical snowy environment with a portable ultra wideband (UWB) system. The study shows the possibility of using UWB technology in a context of real-time positioning of... more
In this paper, we present an UWB positioning experiment performed in a typical snowy environment with a portable ultra wideband (UWB) system. The study shows the possibility of using UWB technology in a context of real-time positioning of avalanche victims. At first, the performed experiment is described. Then, the positioning algorithm based on least-squares (LS) -Taylor series expansion (TSE) is detailed. This algorithm benefits from a prior knowledge of time difference of arrival (TDOA) error biases. Finally, experimental results obtained from measurements are discussed. The obtained results show that the proposed algorithm seems to be accurate and compatible for emergency requirements (e.g. less than lm 2D-RMSE at ranges up to 30m).
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AbstractIn this paper, we describe a global distributed solution that enables the simultaneous performance of time synchroniza-tion and positioning in ultra-wideband (UWB) ad hoc networks. On the one hand, the proposed synchronization... more
AbstractIn this paper, we describe a global distributed solution that enables the simultaneous performance of time synchroniza-tion and positioning in ultra-wideband (UWB) ad hoc networks. On the one hand, the proposed synchronization scheme basically relies on ...
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Abstract: Location information is the key context information for multiple applications and services and it is also used to effectively filter additional context information. An increasing demand for always available context information... more
Abstract: Location information is the key context information for multiple applications and services and it is also used to effectively filter additional context information. An increasing demand for always available context information is imposed by multiple new applications like ...
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deutsch english. Publication View. 36158429. Wireless Hybrid Enhanced Mobile Radio Estimators WHERE (2008). Plass, Simon,; Raulefs, Ronald,; Fleury, Bernard,; Alvarez, Alvaro,; Denis, Benoît,; Slock, Dirk,; Lostanlen, Yves,; Uguen,... more
deutsch english. Publication View. 36158429. Wireless Hybrid Enhanced Mobile Radio Estimators WHERE (2008). Plass, Simon,; Raulefs, Ronald,; Fleury, Bernard,; Alvarez, Alvaro,; Denis, Benoît,; Slock, Dirk,; Lostanlen, Yves,; Uguen, Bernard,; Rodriguez, Jonathan,; ...
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Abstract: This paper presents an overview on the performance of cooperative positioning algorithms evaluated in the WHERE consortium. The novel approaches are analyzed with respect to achievable accuracy and communications aspects. In a... more
Abstract: This paper presents an overview on the performance of cooperative positioning algorithms evaluated in the WHERE consortium. The novel approaches are analyzed with respect to achievable accuracy and communications aspects. In a centralized approach the cooperative ...
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Abstract: This paper presents an overview on the performance of hybrid data fusion and tracking algorithms evaluated in the WHERE consortium. The focus is on three scenarios. For the small scale indoor scenario with ultra wideband (UWB)... more
Abstract: This paper presents an overview on the performance of hybrid data fusion and tracking algorithms evaluated in the WHERE consortium. The focus is on three scenarios. For the small scale indoor scenario with ultra wideband (UWB) complementing cellular communication ...