Simulation of Frequency Selective Rayleigh Faded Hf Channel for Data Transmission Using Decision Feed Back Equalizer
نویسنده
چکیده
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 feedback 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.
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