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In this paper, we propose an efficient channel shortening algorithm, applied to OFDM systems, exploiting a particular decomposition of the Toeplitz convolution channel matrix and of the channel shortening filter (CSF). Unlike classical methods which optimize the CSF following one single criterion applied to the whole response of the filter, our decomposition allows for addition of complementary criteria...
MIMO architectures are generally based on antenna arrays with spatial diversity. An implementation in the particular context of trans horizon transmission through the ionospheric channel copes with the problem of prohibitive array aperture, the wavelength being decametric in the corresponding HF frequency band (3–30 MHz). Therefore, this paper proposes an alternative resorting to the diversity in...
A multiple-input multiple-output (MIMO) system for trans-horizon radio communications within the high-frequency (HF) band (3 to 30 MHz) is presented. The diversity of transmitted polarizations is proposed as an alternative to spatial diversity in order to limit the aperture of antenna arrays at both ends of the radio link. In a theoretical step providing the estimation of capacity gain for different...
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