EXPERIMENTAL VERIFICATION OF AN IONOSPHERIC CHANNEL MODEL
INSTITUTE FOR TELECOMMUNICATION SCIENCES BOULDER CO
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Specially designed ionospheric propagation measurements were made and analyzed to confirm the validity and accuracy of a proposed ionospheric communication channel model. This stationary channel model incorporates a delay line that is fed by the input transmitted signal. Several adjustable taps on the delay line deliver signals with delays corresponding to the relative propagation times of typical ionospheric modes. Each delayed signal is modulated in amplitude and phase by an independent baseband complex bivariate Gaussian random function of time with a zero mean value and quadrature components with equal RMS values that produce Rayleigh fading. Ionospheric measurements were made in 12-kHz bands at two HF frequencies over a 1294-km path. Three samples of 10- to 13-min duration were analyzed for typical daytime and nighttime propagation conditions.
- Radio Communications