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The subject of interference in communications systems is as old as communications
itself. Agamemnon, the King of Mycenes, who captured Troy more
than 800 miles away, to get back his niece, the beautiful Eleni, and wanted
to notify his wife Clytaemistra about this happy event, used the most sophisticated
communication techniques of that time to achieve his purpose. From
that time until today, people have been aware of the importance of interference
and the effect it can have on communications. Agamemnon used light
sources at the peaks of mountains—by the motions of these sources, the
information was coded and transmitted from mountain to mountain to
arrive at Mycenes the same day.
If we analyze this communication system of Agamemnon, we find that
he used three of the most important techniques still used today for interference
suppression in communications. The first was the nature and form of the
information signal (certain shape of flame), which corresponds to signal
modulation techniques of today. The motion of the flames corresponds to
modern coding techniques. The use of mountains corresponds to channel
estimation techniques, which are used for the exploitation of favorable channel
propagation characteristics or the avoidance of unfavorable characteristics
through compensation of certain propagation parameters, fading, narrowband,
or wideband characteristics. |
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发表于 2009-8-10 16:20:01
