A5042202443- Ultra-Wideband Communications Technology
- Indoor and Outdoor Localization Technologies
- Blind Source Separation Techniques
- Advanced Wireless Communication Techniques
- Speech and Audio Processing
- Wireless Communication Networks Research
- Advanced Adaptive Filtering Techniques
- Microwave Imaging and Scattering Analysis
- GNSS positioning and interference
- Antenna Design and Analysis
- Image and Signal Denoising Methods
- Advanced MIMO Systems Optimization
- Sparse and Compressive Sensing Techniques
- Chronic Disease Management Strategies
- Cooperative Communication and Network Coding
- Target Tracking and Data Fusion in Sensor Networks
- Underwater Vehicles and Communication Systems
- Millimeter-Wave Propagation and Modeling
- Power Line Communications and Noise
- Mathematical Analysis and Transform Methods
- Wireless Networks and Protocols
- Clinical practice guidelines implementation
- Radio Frequency Integrated Circuit Design
- Inertial Sensor and Navigation
- Biomedical Text Mining and Ontologies
Eclexys (Switzerland)
2012-2025
Swiss Center for Electronics and Microtechnology (Switzerland)
2000-2010
Institute of Electrical and Electronics Engineers
2008
EURECOM
1998-2003
This paper describes CAREUP, a novel older adult healthy aging support platform based on Intrinsic Capacity (IC) monitoring. Besides standard functionalities like storing health measurement data or providing users with personalized recommendations, the includes intrinsic capacity assessment and prediction algorithms. Older adults’ performance is continuously monitored in all five IC domains—locomotion, psychology, cognition, vitality, sensory capacity—based results answers to questionnaires...
We investigate maximum likelihood (ML) methods for blind and semi-blind estimation of multiple FIR channels. Two deterministic ML (DML) strategies are presented. In the first one, we propose to modify iterative quadratic (IQML) algorithm in order "denoise" it hence obtain consistent channel estimates. The second strategy, called pseudo-quadratic (PQML), is naturally asymptotically denoised. Links between these two approaches established their global convergence proved. Furthermore,...
We analyse typical indoor propagation scenarios with respect to the capacity gain made available through use of multiple transmit and receive antennas. In particular, we investigate channels a strong line sight component, as evident when array is in same room array. It found that for pure LOS component depends highly on geometry receiver location, such vanishes rapidly distance. show existence stochastic scattering components beneficial obtain maximum gain, thus reducing dependence location....
The EIGER <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">1</sup> project proposes a global approach for the exploitation of efficient joint use GNSS signals and UWB positioning in order to allow permanent reliable outdoor/indoor localization. This paper is focused on subsystem designed within project. architecture system design main devices are described. Results selected laboratory tests developed equipments presented discussed.
Promising technologies are being investigated to integrate them into the fifth generation (5G) and beyond mobile network systems. The main goal of these is evolve cellular networks that will significantly stress forward limit legacy systems through all dimensions performance metrics. Some most potential key enabler millimeter waves (mmWave), massive multiple-input multiple-output (MIMO) small cells (SC) These sets dramatically increase throughput, enhance spectral energy efficiency, capacity...
This contribution elaborates on the concept of blind identification multiple FIR channels with prior knowledge (WPK). The considered here corresponds to transmitter (TX) (pulse shaping) and/or receiver (RX) filters present in digital communication systems. Exploitation this allows estimation concentrate impulse response actual channel part itself. Hence can be done more accurately. Since information is expressed terms response, we review a number methods that are parameterized by and...
CAREPATH project is focusing on providing an integrated solution for sustainable care multimorbid elderly patients with dementia or mild cognitive impairment. The has a digitally enhanced patient-centered approach clinical decision and associated intelligent tools the aim to increase patients' independence, quality of life intrinsic capacity. In this paper, conceptual aspects project, in terms technical requirements considerations, are presented.
We propose a high-resolution ranging algorithm for impulse radio (IR) ultra-WideBand (UWB) communication systems in additive white Gaussian noise. formulate the problem as maximum- likelihood (ML) estimation channel delays and amplitudes at receiver. Then we translate obtained delay estimates into an estimate of distance. The ML is non-linear hard to solve. Some previous works focus on finding alternative procedures, example by denoising. In contrast, tackle directly. First, use same...
Nowadays, one of the major limits Unmanned Aerial Vehicles (UAV) is set low cost navigator sensors installed on them. They are vulnerable to vibration, high acceleration, rotation and jerk. Furthermore, magnetometers drift significantly when located close engines, electromechanical devices or in areas with strong magnetic fields (for example grid power lines). This document describes an innovative approach using multi GNSS receivers for UAV's attitude determination.
We consider a wireless system with multiple antennas at both the transmitter and receiver operating in Rician propagation environment. For fixed bandwidth total transmitted power, channel matrix can be seen as sum of two contributions. The first contribution is related to deterministic component channel, which given by line-of-sight (LOS) path only. second denotes stochastic Rayleigh fading paths, case corresponding elements are modeled random variables. focus on averaged capacity expression...
We propose a new decoding algorithm based on cascade structure for impulsive noise correction in multicarrier systems such as orthogonal frequency division multiplexing (OFDM) systems. This has the advantage to lead one hand reduced complexity implementation an OFDM demodulator and other overcome lacks of algorithms dedicated correction. To do so, we start derivation by investigating closed-form analytical expressions priori probabilities used hypotheses tests that are necessary different...
Abstract. This paper presents the current results for FP7 GINSEC project. Its goal is to build a pre-commercial prototype of low-cost, accurate and reliable system professional UAV market. Low-cost, in this context, stands use sensors most affordable segment market, especially MEMS IMUs GNSS receivers. Reliability applies ability autopilot cope with situations where unfavourable reception conditions or strong electromagnetic fields make computation position / attitude difficult. Professional...
We propose a high resolution ranging algorithm for impulse radio ultra-wideband (UWB) communication systems in gaussian noise. pose the problem as maximum likelihood (ML) estimation channel delays and attenuations phase offset at receiver. Then we translate obtained delay estimates into an estimate of distance. The ML is very non linear hard to solve. Some previous works focused on finding alternative procedures, example by denoising. In contrast, tackle directly. First, use same...
In this contribution, we investigate maximum likelihood (ML) techniques for the estimation of time arrival (ToA) ultrawideband (UWB) propagation signals. Using same methodology as [1], which was introduced multichannel estimation, derive ML criteria UWB ToA parameters and apply a denoising frequency-domain procedure so that cost function becomes asymptotically noiseless. We show how pseudo-quadratic (PQML), is naturally denoised, can be applied in case delays prove its convergence to...
In this paper, we derive the Ziv-Zakai lower bounds for Impulse Radio (IR) Ultra-WideBand (UWB) Time Of Arrival (TOA)-based positioning and Difference (TDOA)-based error based on geometry of indoor environments. We present numerical evaluations with IEEE 802.15.4a channel model environments interest. As our derived depend environments, can also be used in real measurements from
The process of developing a computer interpretable, integrated clinical guideline requires multiple considerations and decisions. As part the CAREPATH project, holistic approach to comorbidity has been adopted using an for management multimorbid patients with mild cognitive impairment or dementia. project's technical teams would later interpret implement into interpretable guideline. Three phases should be completed accomplish patient-centered modelling, which include conceptual modelling...
We consider the Ziv-Zakai lower bound for Impulse Radio (IR) Ultra-WideBand (UWB) ranging error under dense multipath environments and additive Gaussian noise. In contrast to previous work (for example and), our derived has following novel points: (1) Our depends on geometry of indoor interest. The uniform distribution is a special case in bound. (2) do not introduce any approximation log-likelihood function during derivation process. Therefore, we obtain more accurate IR-UWB with IEEE...
We consider the problem of positioning estimation with impulse radio (IR) ultra-wideband (UWB) under dense multipaths and additive Gaussian noise environments. Most popular algorithms first estimate certain parameters (such as time arrival (TOA), angle (AOA) difference (TDOA)) from received signals. These are then used to targeted position. In practice, these is not errors free distribution difficult model exactly. contrast, we propose a novel one-step approach, which estimates position...
The EIGER project proposes a global approach for the exploitation of efficient joint use Global Navigation Satellite System (GNSS) signals and Ultra-Wide Band (UWB) positioning in order to allow permanent reliable outdoor/indoor localization. This paper is focused on UWB subsystem designed within project. architecture subsystem, design its components transmission scheme leading time difference arrival determination are described. Results system laboratory tests presented discussed.
This paper presents a transmission line based electrical equivalent schematic of λ/4 monopole antenna for co-simulation with circuits in simulators like ELDO and SPICE. The model is derived from TDR (time domain) measurements yields fast accurate results the impedance DC up to 3 times 1st resonant frequency f0.
Practical impulse radio ultra-wideband (IR-UWB) ranging systems always have to work in multi-user and weak non-line-of-sight (NLOS) environments. In this paper, we derive a novel IR-UWB estimator under NLOS We model MUI with complex Gaussian mixture (CGMM) the frequency domain. propose for UWB time of arrival (ToA) parameters based on expectation maximization (EM) algorithm, pseudo quadratic maximum likelihood (PQML) algorithm CGMM. The reduce domain so that cost function becomes...
In this paper, we investigate the problem of impulsive noise cancellation in systems that use jointly overcomplete expansion representations, namely cyclic geometrically uniform (CGU) frame and sigma-delta (SD) quantization. We first describe existing analogy between CGU frames Reed-Solomn (RS) codes how it can be exploited order to reformulate problem. As does by nature represent a sparse signal, fits compressed sensing (CS) framework. This is why remodel our CGU-/SD-based system as CS...