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What are the advantages disadvantage of pulse amplitude modulation indetails?

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What are the advantages disadvantage of pulse amplitude modulation indetails?
advantage-its a base for all the digital modulation technique


disadvantage-
1.since amplitude keeps varying so there is noise associated with it.
2.due to nyquist criteria its require high bandwidth.
3.due to amplitude variation peek power of receiver also varies with it
























nitesh
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