ch2_signal_system

ch2_signal_system - EEN 404 Communication Systems Ch2:...

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EN 404 EEN 404 Communication Systems Ch2: Signal and System
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Signal and System • A signal is defined as the time history of some quantity, usually a oltage or current 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 oug sys e s
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ignal Classification Signal Classification here are many ways to classify the signals • There are many ways to classify the signals Signals Signals Deterministic Random Energy Power eriodic periodic Periodic Aperiodic
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Figure 2-1 Examples of various types of signals. (a) Deterministic inusoidal) signal (b) Unit rectangular pulse signal (sinusoidal) signal. (b) Unit rectangular pulse signal. (c) Random signal.
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Periodic Signals E.g., 1: Q1: A1: aperiodic 2 Q2: A2: Q3:
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Another example: Q1: A1: Q2: A2: eriod is non nique Usually we pick the minimum positive one as period Period is non-unique. Usually, we pick the minimum positive one as period.
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A useful periodic signal: • A: amplitude 0 : frequency in radians : phase in radians : rotating phasor (different from e j ) elationship to the real signal Relationship to the real signal
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Signal Energy and Power Energy: Power:
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ch2_signal_system - EEN 404 Communication Systems Ch2:...

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