The paper proposes an analytical study regarding airborne radar imaging performances and accounts for a down-looking system moving along parallel lines far, in terms of probing wavelength, from the investigated domain collecting multi-frequency multi-monostatic data. problem is formulated constant depth plane by exploiting Born approximation. Hence, linear inverse scattering faced considering b...

In this paper, the relationship between time and frequency domain joint channel estimation (JCE) in multi-branch, i.e., multi-user and/or multiple antenna, systems is explained. It is proved that the design criterion of optimum pilots for frequency domain JCE can be deduced from the design criterion of optimum pilots for time domain JCE, and vice versa. This uncovers that the optimum pilots in ...

In practical engineering applications, useful information is often submerged in strong noise and the feature information is difficult to be extracted. Aimed at the detection problem of multi-frequency signal under colored noise background, a novel weak signal detection method based on stochastic resonance (SR) tuning by multi-scale noise is proposed. Firstly, noisy signal is processed by orthog...

Widefield frequency-domain fluorescence lifetime imaging microscopy (FD-FLIM) is a fast and accurate method to measure the fluorescence lifetime, especially in kinetic studies in biomedical researches. However, the small range of modulation frequencies available in commercial instruments makes this technique limited in its applications. Here we describe a practical implementation of multi-frequ...

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This article presents the RF characterization results of a large-area MCM-D technology developed within the EU LAP project. Microstrip lines were simulated, designed, and manufactured in several material combinations. Measurements up to 120 GHz showed good coincidence between simulation and reality. Future work is dedicated to filters and antennas in the 77 GHz range.

During recent years, Time-Frequency (TF) techniques have been introduced to characterize scene polarimetric behaviours using PolSAR data. In this paper, we apply a TF decomposition approach to the analysis of PolSAR data with different frequency bands and show some polarimetric TF behaviours of various scenes. The PolSAR data may be decomposed in azimuth direction, range direction only and in b...

In this paper, a unifying framework for orthogonal frequency division multiplexing (OFDM) multiuser resource allocation is presented. The isolated seeming problems of maximizing a weighted sum of rates for a given power budget P̄ and minimizing sum power for given rate requirements R̄ can be interpreted jointly in this framework. To this end we embed the problems in a higher dimensional space. Ba...

Near-infrared spectroscopy and imaging are non-invasive optical methods, which measure various parameters such as the absorption and scattering coefficient of tissue and the concentration of oxy and deoxyhemoglobin, water and fat. Near-infrared spectroscopy and imaging offer the possibility to non-invasively measure hemodynamic responses of the brain to external stimuli. The ability of near-inf...