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Comparisons among ASK, PSK, and FSK | And the definitions of each


  

Comparisons among ASK, PSK, and FSK






ASK or OFF ON Keying

Ask is a simple (less complex) Digital Modulation Scheme where we vary the modulation signal's amplitude or voltage by the message signal's amplitude or voltage. We select two levels (two different voltage levels) for transmitting modulated message signals for the exam. And for example, we mapped the signal as two-level "+5 Volt" (which is the upper level) and another level, "0 Volt," which is considered as the lower level. Whenever we need to transmit binary bit "1," then the transmitter transmits a signal of "+5 Volts," and when we need to send bit "0," then it transmits no power. But the receiver is intelligent enough to deflect whether you've sent binary bit "1" or "0" by deflecting with quipped filters that can distinguish strings of bits. It is possible by the switching capability of the filter with the particular period to determine each bit from a string of bits.  

 
 
 
(Get MATLAB Code)

Fig 1: Output of ASK, FSK, and PSK modulation using MATLAB for a data stream "1   1    0   0   1    0   1   0"

FSK

Like other modulation techniques, the message signal is modulated with the high-frequency carrier wave,e, and then two binary values are represented by two different frequencies. The two frequencies are near the carrier frequency. For example, 

We choose two carrier frequencies, f1 and f2, and f1 > f2. Then we modulate binary bit "1" with f1 and binary "0" with f2 frequency, which is a lower frequency than f1. Now, the modulated signal will look like that,

S1(t) = A cos 2Ï€fc1t      for  binary 1   

And S2(t) = A cos 2Ï€fc2t      for  binary 0

Here, fc1 is different from f1. As you know, when the signal goes thru the modulation process, the frequency of the modulated signal is different from the carrier signal by the message signal's frequency.


PSK

In PSK, here,e the carrier signal phase is with a modulated signal with the phase related to the last bit for binary "1," and binary "0" is sent with a signal with the same phase as the preceding one. For example, whenever we need to transmit binary "1", we change the signal's phase by 180 degree, but the phase remains the same when we transmit binary "0". PSK carrier is used as follows

s(t) = A cos (2Ï€fct + Ï€)    for binary 1

s(t) = A cos (2Ï€fct)           for binary 0 


Comparison among ASK, FSK, and PSK

  • ASK is simple to generate, and it has a less complex circuitry in comparison to FSK and PSK
  • As noise is very sensitive to amplitude so it has poor noise immunity.  
  • FSK is less susceptible to errors than ASK
  • FSK is suitable for high-frequency communication as modulation deals with two different high carrier frequencies here. 
  • FSK circuitry is moderately complex
  • The bit rate in FSK is higher than in ASK 
  • In FSK, noise immunity is high
  • PSK circuitry is very complex 
  • PSK has a higher bit rate as compared to FSK
  • PSK has better noise immunity than FSK

Why are ASK, FSK, and PSK used? 


Electronic devices are sensitive to amplitude, frequency, and phase, so these three digital modulation techniques are used during wireless data transfer.

 

Comparison of BER vs SNR among ASK, FSK, and PSK in MATLAB







(Get MATLAB Code)

Fig 2: Comparison of BER vs SNR among ASK, FSK, and PSK

Read Also

[1] Constellation Diagrams of ASK, FSK, and PSK
 
 

 
# difference between ask fsk psk  # ask psk fsk comparison  # compare ask fsk psk  # ask fsk psk difference  # difference between ask psk fsk  # ask vs fsk vs psk  # ask fsk psk modulation  #

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