02-Digital Tx Fundamentals Review-revised

02-Digital Tx Fundamentals Review-revised - Digital...

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1 Digital Transmission Fundamentals Review Today • Review Digital Transmission Fundamentals – Channel – Signal – Bandwidth – Nyquist –SNR Computer Communications McNair 2011 2
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2 Analog and Digital Transmissions McNair Fall '11 EEL 5718 Computer Communications 3 Digital Signal Transmission 0 1011 0 0 Data to be Sent Digital Signal Channel Noise Digital Signal + Noise 4 01011 1 1 Bits in Error Sampling Times Data Received
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3 • Analog Signals Analog versus Digital Signals – More accurate – nature is analog – Long distance attenuation of signal over twisted pair, cable • Digital Signals –Cos t – Repeaters McNair Fall '11 EEL 5718 Computer Communications 5 – Easier and less costly reproduction and regeneration – Monitoring quality – High bandwidth Analog versus Digital Signals Digital Data d(t) = 0 1 0 Digital Signal x(t) Encoder Digital Data d(t) = 0 1 0 Analog Signal S(f) S(f) f f c Encoder x(t) t 6 Digital Signal Digitizer Digital Data x(t) t Analog Data, e.g., voice t Analog Signal
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02-Digital Tx Fundamentals Review-revised - Digital...

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