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In this study the spatial resolution of microwave data collected by the AMSR-E radiometer is enhanced to evaluate wind speed on a spatial grid finer than the conventional one. The spatial resolution problem is addressed in both Hilbert and Banach spaces and experiments are undertaken on actual data collected over the North Sea. Results show that the spatial resolution of the 6.9 GHz channel can be...
We compare two methods for estimation of path-component spreads in bi-azimuth and delay, namely the clustering approach and the density approach, in indoor environments. Monte Carlo simulations reveal possible shortcomings of the clustering approach. Published estimates of component spreads in delay, azimuth of departure and azimuth of arrival obtained with the clustering approach are reviewed and...
Due to the significantly reduced cost and effort for system calibration time-division multiplexing (TDM) is a commonly used technique to switch between the transmit and receive antennas in multiple-input multiple-output (MIMO) radio channel sounding. Nonetheless, Baum et al. have shown that phase noise of the transmitter and receiver local oscillators, when it is assumed to be a white Gaussian random...
Due to the significantly reduced cost and effort for system calibration time-division multiplexing (TDM) is a commonly used technique to switch between the transmit and receive antennas in multiple-input multiple-output (MIMO) radio channel sounding. Nonetheless, Baum et al. (2004) have shown that phase noise of the transmitter and receiver local oscillators, when it is assumed to be a white Gaussian...
In this contribution, a multi-variate probability density function (pdf) is derived and used to describe the normalized direction-(i.e. azimuth and elevation)-delay power spectral density of individual dispersed components in the response of the propagation channel. This pdf maximizes the entropy under the constraint that its first and second moments are specified. We use a SAGE algorithm, as an approximation...
In this paper, we investigate the impact of the spatiotemporal aperture of a channel sounding system equipped with antenna arrays at the transmitter and receiver on the accuracy of joint estimation of Doppler frequency and bidirection. The contribution of this paper is threefold. First, we state a spatiotemporal model that can describe parallel as well as switched sounding systems. The proposed model...
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