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ch3.5apm - 1 EEN 404 EEN 404 ommunication Systems...

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Unformatted text preview: 1 EEN 404 EEN 404 ommunication Systems ommunication Systems Communication Systems Communication Systems Ch3.5: Analog Pulse Modulation Ch3.5: Analog Pulse Modulation 2 Ch2.8 Sampling Theory Ch2.8 Sampling Theory Sampling theorem: If a signal x(t) satisfies then the signal is completely described by instantaneous sample values with sampling frequency 2W: Nyquist frequency Sampled signal: • Reconstruction: from samples to recover the signal x(t) he signal t) n be exactly reconstructed from the sampled The signal x(t) can be exactly reconstructed from the sampled signal by passing it through an ideal lowpass filter with bandwidth B where W<B<f s-W and f s =1/T s 3 Sampled signal: Spectrum of sampled signal Eq. (2.136): FT: lowpass filtering for construction reconstruction B • f s > 2W no overlap between spectra <B<fs cover t) ithout distortion • W<B<fs-W recover x(t) without distortion 4 • liasing if < 2W Possible distortion Aliasing if f s 2W • Non-ideal lowpass filter 5...
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ch3.5apm - 1 EEN 404 EEN 404 ommunication Systems...

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