CSE3213_05_AnalogDigitalTransmissionW2012_Part_7 - Data...

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31 Data Rate Limits in Digital Transmission depends on three factors: bandwidth available # of levels in digital signal quality of channel level of noise Max Data Rate [bps] Over a Channel? T Nyquist Theorem defines theoretical max bit rate in noiseless channel [1924] even perfect (noiseless) channels have limited capacity Shannon Theorem Nyquist Theorem extended [1949]– defines theoretical max bit rate in noisy channel if random noise is present, situation deteriorates rapidly!
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32 Data Rate Limits: Nyquist Theorem Intersymbol Interference the inevitable filtering effect of any practical channel will cause spreading of individual data symbols that pass through the channel this spreading causes part of symbol energy to overlap with neighbouring symbols causing intersymbol interference (ISI) ISI can significantly degrade the ability of the data detector to differentiate a current symbol from the diffused energy of adjacent symbols T s = 1/2B narrow pulse
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This note was uploaded on 02/14/2012 for the course CSE 3213 taught by Professor A during the Winter '10 term at York University.

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CSE3213_05_AnalogDigitalTransmissionW2012_Part_7 - Data...

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