Abstract Global Navigation Satellite System signals have been used for years to study high-frequency fluctuations ( f > 0.1 Hz) in the ionosphere. The customary procedure uses geometry-free (GF) combination of L 1 and 2 carriers, which it is necessary acquire GPS signal. Initially, had be acquired from a codeless signal, L2P(Y), using several techniques, some them requiring aid . New satelli...

This paper suggests a cooperative spectrum sensing using dynamic double thresholds energy detection and adaptive grid search to obtain the highest probability detection. The proposed double thresholds are adaptive to noise fluctuation. A new fusion method combined of weighting and voting is used in cooperative sensing. Further, in order to obtain the best sensing performance, we firstly use ada...

Introduction: In recent work we showed that by means of sparse estimation techniques the spatial and temporal evolution of single-trial BOLD responses can be automatically detected without any prior knowledge of the stimulus timing and without thresholding: paradigm free mapping (PFM) [1]. However, fMRI time series also contain physiological and instrumental fluctuations which can hinder the de...