Title: Simulation
of Frequency Selective Rayleigh Faded HF Channel for Data Transmission using
Decision Feed Back Equalizer
Abstract: Communication
using the High Frequency (HF) band has been a primary means of beyond line
of sight communication. Despite the advent of several other kinds of transmitting
media it continues to be used extensively owing to the fact that it is economical
and flexible. The use of a channel simulator for evaluating the performance
of a data transmission system offers several advantages. The HF channel
model is simulated and degree of accuracy between input and output is observed.
Efficiency of this model derived from the decision feed back equalizer is
good even under severe distortion. Unlike cables, whose properties
can be accurately defined and reproduced, Ionosphere channel properties can’t
be reproduced easily, transmission conditions vary uncontrollably and it
is not possible to test a system repeatedly for the same channel conditions.
This simulator is accurate and a large range of channel conditions can be
produced in a controlled manner. It is possible to compare the performance
of several systems under the same channel conditions using a channel simulator.
And tests can be repeated any number of times with consistent channel transmitting
conditions.