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Constellation Diagram of ASK in Detail

 


Energy per bit (Eb):



For transmission of binary ‘1'

We know that all periodic signals are power signals. Now we’ll find the energy of ASK for the transmission of binary ‘1’.




**where Ac is the amplitude of the carrier signal

fc is the carrier frequency in Hz



To save transmitter energy, Eb should be small.






For transmission of binary ‘0’






Constellation Diagram







In constellation diagram the function whose energy is equal to 1 is said to be a normalized function.




In the above figure the reference axes corresponds to normalized functions.








High-order Amplitude Shift Keying (ASK) refers to using a large number of amplitude levels to represent digital data. For instance, in binary ASK (BASK), there are two amplitude levels, usually represented as 0 and 1. High-order ASK can have more than two amplitude levels, such as 4, 8, 16, 64, etc.
 

MATLAB Code For Constellation Diagram of ASK  

 
 

Output 

 
 
 

 

Effect of Noise on Constellation Diagram of ASK

At SNR = 5 dB
 
 
 At SNR = 10 dB

 
 
At SNR = 15 dB

 
 
At SNR = 30 dB


 

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