Compare PAM, PWM and PPM.

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SR. NO.	PARAMETER	PAM	PWM	PPM
1	Type of Carrier	Train of Pulses	Train of Pulses	Train of Pulses
2	Variable Characteristic of the Pulsed Carrier	Amplitude	Width	Position
3	Bandwidth Requirement	Low	High	High
4	Noise Immunity	Low	High	High
5	Information Contained in	Amplitude Variations	Width Variations	Position Variations
6	Transmitted Power	Varies with amplitude of pulses	Varies with variation in width	Remains Constant
7	Need to transmit synchronizing pulses	Not needed	Not needed	Necessary
8	Complexity of generation and detection	Complex	Easy	Complex
9	Similarity with other Modulation Systems	Similar to AM	Similar to FM	Similar to PM
10	Output waveforms	Refer Figure down	Refer Figure down	Refer Figure down

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