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High data rate transmissions over h.f. links

High data rate transmissions over h.f. links

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© The Institution of Electronic and Radio Engineers
Published

A review is presented of the problems inherent in transmitting data over h.f. links. The propagation medium imposes characteristics of time and frequency dispersion, fading and delay distortion upon the transmitted signal, particularly when wide bandwidths are used. The magnitude and variability of these features are quantified and a simplified expression for the received signal is derived. Techniques that have been used to transmit high data rates over h.f. links are summarized and their relative merits compared. It is concluded that the ionosphere continues to be a limiting factor in the design of an efficient modem, but that recent developments in microelectronics provide the potential to make a significant improvement in the performance of future communication systems.

Inspec keywords: fading; ionospheric electromagnetic wave propagation; radio links; data communication systems

Other keywords: frequency dispersion; data transmission; ionosphere; communication systems; fading; delay distortion

Subjects: Radiowave propagation; Ionospheric electromagnetic wave propagation; Point-to-point radio systems

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