In the last post 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.
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.
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.
Comparison of PAM, PWM and PPM Modulation Techniques Video [HD]
1.Definition of PAM, PWM and PPM
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 of PAM, PWM and PPM
Waveform of PAM, PWM and PPM is given in the image below. Click on the image to enlarge it. |
| Comparison of PAM, PWM, PPM Waveforms |
3.Variable Parameter of the Carrier in PAM, PWM and PPM
PAM- AmplitudePWM- Width
PPM- Position
4.Where the Information is Present in PAM, PWM and PPM
PAM- In amplitude variations of the pulsesPWM- In width variations of the pulses
PPM- In position variations of the pulses
5.Type of Carrier Wave Used in PAM,PWM and PPM
PAM- Train of pulsesPWM- Train of pulses
PPM- Train of pulses
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#PULSE MODULATION TECHNIQUES (PAM, PWM, PPM, PCM)
6.Bandwidth of PAM, PWM and PPM
PAM- Bandwidth depends on the width of the pulseBandwidth 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 in PAM, PWM and PPM
PAM- Power varies due to change in amplitude of the pulsesPWM- 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 in PAM, PWM and PPM
PAM- Noise interference is maximum and it is difficult to remove noisePWM- Noise interference is less due to constant amplitude
PPM- Noise interference is less due to constant amplitude
9.Similarity of PAM, PWM and PPM 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 in case of PAM, PWM and PPM
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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