Abstract
A radio-engineering approach based on the dispersion characteristic and impulse response of a radio channel is proposed to describe the dispersion distortion of complex shortwave radio signals propagating through ionospheric radio channels. The impulse response of a wideband ionospheric radio channel is investigated using the polynomial representation of the dispersion characteristics, which are determined from oblique sounding of the radio channel by ultrawideband chirp signals. Frequency bands for optimal propagation of complex signals over radio links 3600 to 5700 km long are estimated.
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