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ch2_signal_system_handout

# ch2_signal_system_handout - EEN 404 Communication Systems...

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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.
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 <

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ch2_signal_system_handout - EEN 404 Communication Systems...

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