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nyquist bandwidth criterion

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erece

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According to Nyquist bandwidth constraint for transmission without ISI , the minimum channel bandwidth should be R/2 symbols /sec, where R symbols /sec is the transmisson rate.
If this is correct then i want to know that if this channel cannot support full transmission rate then do we use this model ??
 

The Nyquist figure is also tossed around in digital sound processing. Your sample rate must be, at minimum, twice the frequency of the highest frequency you intend to process.

As a guideline it's prominent today because it emerged as a usable concept as the technology was in development.

Not that it's a be-all and end-all guideline. Since it's possible for your sampling window to catch a waveform at zero crossings. Then you get nothing.

Or suppose the waveform is slightly different from half the sample rate. Then you get a subsonic rumble, or other such incongruous result.
 

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