Difference Between PAM PWM PPM - PAM Vs PWM Vs PPM - Comparison of PAM PWM PPM - Pulse Modulation

In this video lecture you will understand the difference between PAM, PWM and PPM. The comparison of PAM PWM PPM is based on the many parameters that are explained here in this video. Actually Pulse Amplitude Modulation (PAM), Pulse Width Modulation (PWM) and Pulse Position Modulation (PPM) are types of pulse modulation techniques.
Pulse Modulation techniques are compared on the basis of following parameters-
1. Definition of PAM, PWM and PPM
2. Waveform of PAM, PWM and PPM
3. Variable Parameter
4. Bandwidth of PAM, PWM and PPM
5. Power in PAM, PWM and PPM
6. Noise interference in PAM, PWM and PPM
7. Similarity with Continuous Wave modulation
8. Synchronization between transmitter and receiver etc.

We discussed different types of pulse modulation techniques, like Pulse Amplitude Modulation (PAM), Pulse Width Modulation (PWM), Pulse Position Modulation (PPM) and Pulse Code Modulation (PCM).
In this post we will deal with the comparative study of PAM, PWM and PPM.
Here we will compare these 3 different pulse modulation techniques, on the basis of various parameters.

1.Definition
PAM- In pulse amplitude modulation, the amplitude of the pulsed carrier wave is varied according to the modulating signal value.
PWM- In pulse width modulation, the width of pulsed carrier is varied as per the value of the modulating signal.
PPM- In pulse position modulation, the position of the pulsed carrier is varied as per value of modulating signal.

2.Waveform
Waveform of PAM, PWM and PPM is given in the image below. Click on the image to enlarge it.

3.Variable Parameter Of The Carrier
PAM- Amplitude
PWM- Width
PPM- Position

4.Where The Information Is Present
PAM- In amplitude variations of the pulses
PWM- In width variations of the pulses
PPM- In position variations of the pulses

5.Type of Carrier Wave Used
PAM- Train of pulses
PWM- Train of pulses
PPM- Train of pulses

6.Bandwidth
PAM- Bandwidth depends on the width of the pulse
Bandwidth requirement is low
PWM- Bandwidth of the channel depends on rise time of the pulse
Bandwidth requirement is high
PPM- Bandwidth depends on rise time of the pulse
Bandwidth requirement is high

7.Instantaneous Power
PAM- Power varies due to change in amplitude of the pulses
PWM- Instantaneous power varies due to change in width of the pulses
PPM- Instantaneous power is constant due to constant amplitude and width of the pulses

8.Noise Interference
PAM- Noise interference is maximum and it is difficult to remove noise
PWM- Noise interference is less due to constant amplitude
PPM- Noise interference is less due to constant amplitude

9.Similarity With Continuous Wave Modulation
PAM- Similar to Amplitude Modulation (AM)
PWM- Similar to Frequency Modulation (FM)
PPM- Similar to Phase Modulation (PM)

10.Synchronization Between Transmitter And Receiver
PAM- Synchronization between transmitter and receiver is not required.
PWM- In this case too no need of any synchronization
PPM- In Pulse position modulation synchronization is required. The transmitter sends synchronizing pulses.

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