ch2_signal_system_handout

ch2_signal_system_handout - 9/2/2010 EEN 404 Communication...

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9/2/2010 1 EEN 404 Communication Systems Ch2: Signal and System Signal and System • A signal is defined as the time history of some quantity, usually a voltage or current • A system is a combination of devices and networks chosen to perform a desired function • The study of communication systems (information exchange systems) is inherently concerned with the transmission of signals through systems Signal Classification • There are many ways to classify the signals Signals Signals Deterministic Random Periodic Aperiodic Energy Power
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9/2/2010 2 Figure 2-1 Examples of various types of signals. (a) Deterministic (sinusoidal) signal. (b) Unit rectangular pulse signal. (c) Random signal. E.g., Periodic Signals Q1: A1: aperiodic Q2: A2: Q3: Q1: A1: Q2: Another example: A2: Period is non-unique. Usually, we pick the minimum positive one as period.
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9/2/2010 3 A useful periodic signal: • A: amplitude 0 : frequency in radians : phase in radians : rotating phasor (different from e j ) Relationship to the real signal Energy: Power: For periodic signal: Signal Energy and Power • x(t) is an energy signal iff 0 < E < ∞⇒ P=0
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This note was uploaded on 10/28/2010 for the course EEN 404 taught by Professor X.cai during the Spring '10 term at University of Miami.

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ch2_signal_system_handout - 9/2/2010 EEN 404 Communication...

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