16 kbps modems for the HF NVIS channel
16 kbps modems for the HF NVIS channel
- Author(s): N.S. Hoult ; J.R. Whiffen ; M.H. Tooby ; P.C. Arthur
- DOI: 10.1049/cp:20000195
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- Author(s): N.S. Hoult ; J.R. Whiffen ; M.H. Tooby ; P.C. Arthur Source: 8th International Conference on High-Frequency Radio Systems and Techniques, 2000 p. 317 – 321
- Conference: 8th International Conference on High-Frequency Radio Systems and Techniques
- DOI: 10.1049/cp:20000195
- ISBN: 0 85296 727 6
- Location: Guildford, UK
- Conference date: 10-13 July 2000
- Format: PDF
In the tactical radio environment, VHF communications is the norm. However, there are occasions when VHF links are impracticable, perhaps because of the intervening terrain, and in these cases HF near vertical incidence skywave (NVIS) links are sometimes used. A drawback of these links is that the available data rate with present day equipment is only 2.4 to 4.8 kbps at most, whereas VHF links can offer 16 kbps and above. There is therefore a desire to achieve higher data rates over HF NVIS channels. This paper reports the results of a study into providing a 16 kbps data rate in a 3 kHz HF NVIS channel. The design of the modems is outlined, and both laboratory and field measurements of performance are presented.
Inspec keywords: HF radio propagation; telecommunication equipment testing; modems; radio links; ionospheric electromagnetic wave propagation; multipath channels; AWGN channels; Rayleigh channels; military communication
Subjects: Modems; Radio links and equipment; Military communications; Radiowave propagation
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