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Motor imagery based BCIs are one of the most important BCI paradigms. Although it has been studied for a long time, the EEG features for kinetic information of motor imagery are still less known. In this paper, we explored EEG patterns of hand force motor imagery. Six subjects participated in this study, who were required to imagine clenching their hands with two different levels of force during the...
It has been proved that scattering center modeling for narrow band signals can be achieved through the optimum image matching of time-frequency representation (TFR). In order to obtain TFR, however, the azimuth sampling interval should be quite small for electrically large target, which results in a huge amount of electromagnetic computation. Under the situation of under-sampling scattered waves,...
In the traditional miss distance (MD) estimation, Doppler frequencies of radar echoes are used to estimate MD by curve fitting, which is based on the signal model of a single scattering center. Actually, scattering responses of an extended object are contributed by a series of scattering centers. Moreover, the attributes (i.e., amplitudes and locations) of scattering centers of different types change...
The scattering centers induced by creeping waves on cone-shaped targets are studied. Because of separated transmitters and receivers, the scattering centers could be observed in bistatic mode, especially under situation of large bistatic angles. Although induced by the same scattering mechanism, i.e., creeping waves, scattering centers on different profiles of cone-shaped targets have distinguished...
The application of sliding scattering centers induced by reflected waves in feature extraction has been investigated. The scattering center change with the line of sight of radar (LOS) and show distinguished feature in the time-frequency representations (TFR). The time-frequency signatures of the scattering center have been utilized to deduce the geometry and motion parameters of two streamlined targets...
In an OFDM-based cooperative relay system, the arrival times and carrier frequency offsets (CFOs) of the signals from different relays are most likely different. Estimation of these timing offsets and CFOs is a crucial and challenging task. In this paper, a new preamble structure is designed, and an efficient time and frequency offset estimator is proposed for the OFDM-based cooperative system. The...
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