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Advantages and Disadvantages of PAM PWM PPM

This page covers advantages and disadvantages of PAM, PWM and PPM. It mentions PAM advantages, PAM disadvantages, PWM advantages, PWM disadvantages, PPM advantages and PPM disadvantages. PAM stands for Pulse Amplitude Modulation, PWM stands for Pulse Width Modulation and PPM stands for Pulse Position Modulation.

What is PAM?

Introduction:
As mentioned PAM is short form of Pulse Amplitude Modulation in which amplitude of pulse is proportional to amplitude of the modulating signal. It is similar to amplitude modulation (AM).

PAM

Benefits or advantages of PAM

Following are the benefits or advantages of PAM:
➨In PAM, amplitudes of regularly spaced pulses are varied in proportion to corresponding sample values of continuous message signal. Hence system is lowest in complexity to implement. Hence generation and detection is easy.

Drawbacks or disadvantages of PAM

Following are the disadvantages of PAM:
➨Noise interference is higher.
➨It is difficult to remove noise, as this will affect amplitude part which carries information.
➨It has lowest power efficiency among all three types.
➨Instantaneous power of transmitter varies.
➨Transmission bandwidth is too large.

What is PWM?

Introduction:
As mentioned PWM is short form of Pulse Width Modulation in which width of pulse is proportional to amplitude of the modulating signal. It is similar to frequency modulation (FM).

PWM

Benefits or advantages of PWM

Following are the benefits or advantages of PWM:
➨Noise interference is less or minimum.
➨System is moderate in complexity to implement.
➨It has moderate power efficiency among all three types.
➨It supports higher power handling capability.

Drawbacks or disadvantages of PWM

Following are the disadvantages of PWM:
➨Instantaneous power of transmitter varies.
➨The system requires semiconductor devices with low turn-ON and turn-OFF times. Hence they are very expensive.
➨High switching losses due to higher PWM frequency.

What is PPM?

Introduction:
As mentioned PPM is short form of Pulse Position Modulation in which relative position of pulse is proportional to amplitude of the modulating signal. It is similar to phase modulation (PM).

PPM

Benefits or advantages of PPM

Following are the benefits or advantages of PPM:
➨Noise interference is less or minimum due to constant amplitude.
➨It is easy to separate out signal from noisy signal.
➨It has highest power efficiency among all three types.
➨Instantaneous power of PPM modulated signal remains constant due to constant pulse widths and pulse amplitudes.
➨It requires less power compare to PAM due to short duration pulses.

Drawbacks or disadvantages of PPM

Following are the disadvantages of PPM:
➨System is highest in complexity to implement.
➨It requires very large bandwidth (BW) compare to PAM.

Modulation types

AM vs FM vs PM
AM FM PM MATLAB Code
What is modulation
BPSK-This page describes BPSK modulation technique with equation and constellation diagram.
QPSK -This page describes QPSK modulation technique with equation and constellation diagram.
QAM-This page describes QAM modulation technique with equation and constellation diagram.
MSK-GMSK MSK modulation,GMSK modulation and GMSK demodulation.
8PSK 8-PSK modulation or multilevel PSK or phase shift keying modulation technique.
BPSK vs QPSK -Difference Between BPSK and QPSK modulation techniques.
QPSK vs OQPSK vs pi/4QPSK-Difference between QPSK,OQPSK and pi/4QPSK modulation techniques
Differential Encoder and Decoder

Advantages and Disadvantages of other wireless technologies

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What is Difference between

difference between OFDM and OFDMA
Difference between SC-FDMA and OFDM
Difference between SISO and MIMO
Difference between TDD and FDD
FDMA vs TDMA vs CDMA
FDM vs TDM
CDMA vs GSM

RF and Wireless Terminologies


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