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Wideband measurements of coherence over an HF skywave link and implication for spread‐spectrum communication
Author(s) -
Salous S.,
Shearman E. D. R.
Publication year - 1986
Publication title -
radio science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.371
H-Index - 84
eISSN - 1944-799X
pISSN - 0048-6604
DOI - 10.1029/rs021i003p00463
Subject(s) - wideband , coherence bandwidth , bandwidth (computing) , skywave , high frequency , fading , physics , ionosphere , optics , amplitude , delay spread , telecommunications , acoustics , radar , computer science , channel (broadcasting) , astronomy
A wideband frequency‐modulated, continuous‐wave (FMCW) oblique incidence sounder was used in an experiment to measure the coherent bandwidth of a one‐hop F 2 layer propagated ionospheric path. The experimental data were collected over a 234‐km link in the United Kingdom by using frequency sweeps of up to 5 MHz repeated at 10‐s intervals. The path had the characteristics of quasi‐longitudinal propagation. The results indicated that the limiting factors to the coherent bandwidth are mainly polarization interference and frequency dispersion. Data on the coherent bandwidth and fade depth as a function of frequency and the time variation of the amplitude frequency response are presented.