The growing need for Earth observation and monitoring systems has stimulated considerable interest in free-space optical wireless (FSO) systems because of the huge bandwidth requirements. However, terrestrial FSO links are severely impacted by weather conditions especially dense fog to a larger extent while, rain and snow to a lesser extent. For the proper deployment of…
In this thesis we address the subject of automatic extraction of harmony information from audio recordings. We focus on chord symbol recognition and methods for evaluating algorithms designed to perform that task. We present a novel six-dimensional model for equal tempered pitch space based on concepts from neo-Riemannian music theory. This model is employed as…
The electric power lines and its associated equipments generally produce an electromagnetic noise in their environment, which are likely to have dangerous effects on propagation environment to the Global System for Mobile Communication (GSM) cellular mobile network and its equipements. In this study, we analyzed the exprimental characteristics of the power line noise and its…
Traditional antenna performance descriptors such as input port impedance, radiation pattern or effective antenna length generally face strong frequency dependence. In this context the traditional narrowband approach to antenna design is no more appropriate for UWB antennas. Such antennas behave as spatial and temporal filters, distorting the radiated waveforms. Indeed, the radiated signal distortion is…
In recent years, research on Wireless Sensor Networks (WSN) has attracted considerable attention. This is in part motivated by the large number of applications in which WSNs are called to play a pivotal role, such as parameter estimation (namely, moisture, temperature event detection (leakage of pollutants, earthquakes, fires), or localization and tracking (for e.g. border…
In multiuser ultra-wideband (UWB) systems, a large number of multipath components (MPCs) are introduced by the channel. One of the main challenges for the receiver is to effectively suppress the interference with affordable complexity. In this thesis, we focus on the linear adaptive interference suppression algorithms for the direct-sequence ultrawideband (DS-UWB) systems in both time-domain…
In a natural acoustic environment, multiple sources are usually active at the same time. The task of source separation is the estimation of individual source signals from this complex mixture. The challenge of single channel source separation (SCSS) is to recover more than one source from a single observation. Basically, SCSS can be divided in…
To reduce scanning time or improve spatio-temporal resolution in some MRI applications, parallel MRI acquisition techniques with multiple coils have emerged since the early 90?s as powerful methods. In these techniques, MRI images have to be reconstructed from ac- quired undersampled ?k-space? data. To this end, several reconstruction techniques have been proposed such as the…
This thesis presents a new representation called floating polygon soup for applications like 3DTV and FTV (Free Viewpoint Television). The polygon soup is designed for compactness, compression efficiency, and view synthesis quality. The polygons are stored in 2D, with depth values at each corner. They are not necessarily connected to each other and can be…
This thesis is concerned with the design of a complete framework that allows the real-time recognition of humans in a video stream acquired by a static camera. For each stage of the processing chain, which takes as input the raw images of the stream and eventually outputs the identity of the persons, we propose an…
