Principles of Electronic Communication
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Principles of Electronic Communication
Sample questions with model answers
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Draw at least 8 flat top PAM, PWM and PPM samples using one cycle of a sine wave as the modulating signal.
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Draw samples showing modulation types with sine wave.
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Explain the sampling theorem and how it is used in communications.
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The sampling theorem states that a signal can be perfectly reconstructed if sampled at twice its maximum frequency.
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From 4 (a). above, redraw the PAM signals as: (i). Impulses (ii). Natural samples
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Redraw PAM signals as impulse and natural samples.
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What causes aliasing? Draw the appropriate domain diagrams to illustrate aliasing and over-sampling.
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Aliasing occurs when a signal is sampled below its Nyquist rate.
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