Title :
A model of high frequencies (H.F) channel used to design a modem of 9600 bits/s rate in 3 kHz of bandwidth
Author_Institution :
Lab. of Radiocommun., Rennes I Univ.
Abstract :
Our goal is to develop an HF transmission system, thus, we need to model the ionospheric channel. We define our HF channel model starting from its weighting function g(t,τ) and its transfer function G(f,t) variable in time. Study of the correlation function of the channel filter allows to characterize the channel model with two fundamental parameters used to design any modem: the coherence bandwidth Bc and the coherence time Tc
Keywords :
HF radio propagation; ionospheric electromagnetic wave propagation; military communication; modems; time-varying channels; 3 kHz; 9600 bit/s; HF channel model; HF transmission system; bandwidth; channel filter; coherence bandwidth; coherence time; correlation function; ionospheric channel; modem; transfer function; weighting function; Bandwidth; Baseband; Coherence; Filters; Frequency; Modems; Propagation delay; Pulse measurements; Time measurement; Transfer functions;
Conference_Titel :
MILCOM 97 Proceedings
Conference_Location :
Monterey, CA
Print_ISBN :
0-7803-4249-6
DOI :
10.1109/MILCOM.1997.648731
