Publicaties
Gekozen filters:
Gekozen filters:
Test Signal Development and Analysis for OFDM systems RF Front-end Parameter Extraction KU Leuven
Testing radio frequency (RF) transceivers requires the measurement of a diverse set of specifications, requiring multiple testing setups. This complicates load board design, debug, and diagnosis, as well as results in long testing time. In this paper, we present a single setup testing solution for orthogonal frequency-division multiplexing systems RF front-ends based on a loop-around scheme. With this technique, it is possible to determine gain ...
New cepstral methods of signal pre-processing for operational modal analysis KU Leuven
Operational modal analysis (OMA) has the advantage that the system properties are determined under actual operating conditions (and may vary somewhat for different operating conditions) so more powerful OMA techniques are continually sought. Cepstral methods of OMA have some advantages over other techniques since they give both poles and zeros of a transfer function, and thus some of the information about relative strength of adjacent modes. All ...
Measuring and analysis of nonlinear characterization of lithium-ion batteries using multisin excitation signal. Vrije Universiteit Brussel
This paper introduces a novel methodology for analysis in the frequency domain. This methodology looks to the battery from a different point of view and covers aspects of the battery that is often neglected in other works and analysis battery precisely. Using periodic signals such as random phase multisine for system identification, allows separating noise and nonlinear distortions from the linear part of the system’s response.In addition to a ...
Analysis of Signal Processing Methods to Reject the DC Offset Contribution of Static Reflectors in FMCW Radar-Based Vital Signs Monitoring Interuniversitair Micro-Electronica Centrum vzw
Frequency-modulated continuous wave (FMCW) radars are currently being investigated for remote vital signs monitoring (measure of respiration and heart rates) as an innovative wireless solution for healthcare and ambient assisted living. However, static reflectors (furniture, objects, stationary body parts, etc.) within the range or range angular bin where the subject is present contribute in the Doppler signal to a direct current (DC) offset. ...
Signal transduction analysis of the NLRP3-inflammasome pathway after cellular damage and its paracrine regulation KU Leuven
Activation of the NLRP3-inflammasome pathway and production of the inflammatory cytokine IL-1B after cellular damage caused by infarct or infection is a key process in several diseases such as acute myocardial infarction and inflammatory bowel disease. However, while the molecular triggers of the NLRP3-pathway after cellular damage are well known, the mechanisms that sustain or confine its activity are currently under investigation. We present ...
Design and analysis of the UW-OFDM signal Universiteit Gent
Unique word (UW-) OFDM is a novel multicarrier system that is shown to be suitable for cognitive radio systems. To construct the UW-OFDM signal, a code generation matrix is required to introduce redundancy in the frequency domain, implying that the code generation matrix must satisfy a number of conditions. In this paper, we use an algebraic construction method to separate the conditions imposed by the signal shape from the code design. The ...
Signal loss due to oligomerization in ELISA analysis of amyloid-beta can be recovered by a novel sample pre-treatment method Universiteit Antwerpen
According to the predominant theories, soluble amyloid-beta (Aβ) aggregates are the principal neurotoxic agents in Alzheimers disease pathology, making them a popular target for the development of therapeutics and diagnostic markers. One of the most commonly used methods for determining the concentration of Aβ is ELISA. However, ELISA was developed for monomeric proteins and may be ill-suited for detecting aggregates. Therefore, we investigated ...
Design of Widely Tunable Mexican Hat Wavelet Filter for Cardiac Signal Analysis KU Leuven
This paper presents a widely tunable analog Mexican hat wavelet filter for ECG signal analysis. The Mexican hat function is implemented as a difference of two Gaussian low-pass filters each of which is implemented as a cascade of switched capacitor low-pass filters. The Mexican hat scale can easily be tuned across a wide range, from frequency bandwidths of a couple of Hz to few KHz, by changing the clock frequency of the switched capacitor ...
Consonant recognition and articulatory feature classification from signal analysis at multiple time scales KU Leuven
Consonants exhibit acoustic features that are mani- fested at different time scales: bursts in plosives live on a millisecond scale, while semivowels are best an- alyzed at a centisecond or decisecond scale. Yet, it is not easy to integrate analysis at different time scales in the prevailing Hidden Markov Model (HMM). In this paper, we consider the Non-negative Matrix Fac- torization (NMF) model for consonant recognition and classification of ...