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Signal
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=== Deterministic and random === Deterministic signals are those whose values at any time are predictable and can be calculated by a mathematical equation. Random signals are signals that take on random values at any given time instant and must be modeled [[stochastic]]ally.<ref>{{Cite book|title=Principles of communication : systems, modulation, and noise|last=Ziemer |first=Rodger E.|last2=Tranter |first2=William H. |publisher=Wiley |isbn=9781118078914|edition= Seventh|location=Hoboken, New Jersey|oclc=856647730|date = 2014-03-17}}</ref>
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