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The first three carry their information in the edge locations or the top of the pulse which are variable quantities and are really a form of analog modulation. PCM depends only the presence or absence of a pulse which has more noise immunity.
actually PCM is the only digital communication system. hence in this way it has more noise immunity than other three. the PWM,PAM,PPM is the analog modulation technique not the digital communication. the PWM,PAM,PPM SURELY HAS MORE NOISE IMMUNITY THAN AM. WHICH IS ALSO ANALOG MODULATION SYSTEM
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