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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。
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