What are the advantages disadvantage of pulse amplitude modulation indetails?

advantage-its a base for all the digital modulation technique

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

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How is pulse amplitude modulation transmitted?

Generally pulse amplitude modulation (PAM) is trasmitted as a  series of DC levels and are mostly used in wired trasmissions (DC  is not effective wirelessly).

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