A model for wideband HF propagation channels

Abstract

Expressions to model the sky wave propagation conditions that occur in a HF communication link are presented. The model is intended not only for narrowband applications but also for wideband systems such as those using spread spectrum techniques. A discussion of the background leading to the present development effort is followed by a description of the method used to derive the model transfer function. Analytic expressions for the impulse response and the scattering function are given, and the introduction of random processes into the model is described. Comparisons of scattering functions from the model and from measurements are shown for spread‐F conditions ranging from mild to intense and for both an auroral path and a midlatitude path.

A comprehensive sounding of the ionospheric HF radio link from Antarctica to Spain

“…[]. Vogler and Hoffmeyer [] from Institute of Telecommunication Science (ITS) developed a wideband ionospheric HF channel model with non Gaussian statistics and delay spread parameters. Mastrangelo et al .…”

On the Capacity of Mid-latitude High Frequency Ionospheric Channel

“…The next part concerns the numerical representation of the average capacity in (18). Finally, we use real ionospheric measurements recorded during the days around the total Solar eclipse of 1999 August 11 to estimate the average channel capacity.…”

“…; for x < 0 (K = 0.5772157). The result in (18) represents the capacity of a link with L independent paths characterized by Doppler spread σ p , p ∈ {1, . .…”

“…We consider three channel models corrupted by Doppler spread and the average capacity specified by (18). Three scenarios are realized in this simulation: we denote by scenario i the case where we use the same Doppler spread σ i in each of the two paths, (scenario 1 consists of two paths with the same Doppler σ 1 = 0.5 Hz, scenario 2 corresponds to σ 2 = 1 Hz and scenario 3 corresponds to σ 3 = 1.5 Hz).…”

Midlatitude ionospheric HF channel reciprocity: Evidence from the ionospheric oblique incidence sounding experiments

“…As a result, the scattering function, which describes the group delay spread and Doppler spread of pulse signals propagation in a turbulent ionosphere, is of great importance to characterize the HF ionospheric channel and acquire a better understanding of HF channel reciprocity. By performing scattering function modeling of a reflective and fluctuated ionospheric channel, Watterson et al [1970] first established the statistical stationary narrowband HF channel model, followed by the development of the wideband model of the HF channel by Vogler and Hoffmeyer [1993]. In terms of theoretical analysis the phase‐screen‐diffraction‐layer method [ Kiang and Liu , 1985a, 1985b; Wagen and Yeh , 1986, 1989a, 1989b] was used to compute the transfer functions and coherence functions along the oblique HF ray path.…”