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Signalling rate and Bandwidth

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magnetra

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"The Nyquist bandwidth required for signalling rate of R is R/2." I think this relation is meant only forpolar PAM signalling. Does the same relation between bandwidth and signalling rate hold for other signalling methods (unipolar, bipolar, manchester)?

M
 

This is the minimum sampling rate to be able to reconstruct the signal without error. It has nothing to do with modulation methods.
 

Manchester Coding is a Coding method. It has nothing to do with modulation, but the signalling rate used is twice that of the data source's signalling rate.
 

My question was regarding the relation between Nyquist BW and signaling rate as defined the ideal solution to Nyquist Pluse Shaping Criteria.

The Nyquist BW so defined is the minimum tx bw for zero ISI and is equal to one half of the bit rate (1/Tb). This relation between Nyquist BW and bit rate, does it hold for unipolar, polar, bipolar signaling equally?

From earlier replies, I thought my question might have been misunderstood. HOpe this is clear. Or if I'm wrong please correct me and please explain me the missing link in my understanding regards to this topic, if any?

Regards
M
 

The Nyquist filtering criteria is a linear phase response and a symmetrical magnitude response around the half voltage point. This produces sinc type output pulses but the zero crossings are at the peaks of adjacent pulses.

This is for half of the symbol rate independent of the amplitude level, number of levels, and DC offset.
 

hi...sid here...this is a universal law...it is nothing to do with the technique u are using...u can reconstruct yr original signal by applying a proper filter after using this law...sidra_maheen84@yahoo.com
 

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