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Constellation Diagram of ASK in Detail

A binary bit '1' is assigned a power level of Eb\sqrt{E_b} (or energy EbE_b), while a binary bit '0' is assigned zero power (or no energy).
 

Simulator for Binary ASK Constellation Diagram

Noisy Modulated Signal (ASK)

Original Modulated Signal (ASK)


Energy per bit (Eb) (Tb = bit duration):

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

Eb = ∫0Tb(Ac.cos(2П.fc.t))2 dt
= ∫0Tb(Ac)2.cos2(2П.fc.t) dt
Using the identity cos2x = (1 + cos(2x))/2:
= ∫0Tb((Ac)2/2)(1 + cos(4П.fc.t)) dt
= ((Ac)2/2) ∫0Tb(1) dt + ((Ac)2/2) ∫0Tbcos(4П.fc.t) dt
= ((Ac)2/2) * Tb + 0 (The integral of cos(4П.fc.t) over a full period is zero, assuming Tb is an integer multiple of 1/(2fc))
Eb = (Ac2/2).Tb (where Tb is the bit duration)

** where Ac is the amplitude of the carrier signal and fc is the carrier frequency in Hz.

To save transmitter energy, Eb should be small.

** for transmission of binary ‘0’
Eb = ∫0Tb(S2(t))2dt = 0

** Constellation Diagram
First, we define the orthonormal basis function for this system:
φ1(t) = √(2/Tb) cos(2Пfct) for 0 ≤ t ≤ Tb.
The energy of this basis function is 1.

Now, we can represent our signaling waveforms using this basis function:
For binary '1': S1(t) = Ac cos(2Пfct) = [Ac * √(Tb/2)] * φ1(t)
The coordinate for S1(t) in the constellation diagram is g11 = Ac * √(Tb/2).
The energy of S1(t) is Eb = g112 = (Ac2 * Tb)/2.
Therefore, g11 = √(Eb).

For binary '0': S2(t) = 0. The coordinate for S2(t) is g21 = 0.

So, in the constellation diagram:
1 => point at √(Eb) along the φ1 axis
0 => point at 0 (the origin)


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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  Interests: Signal Processing, Telecommunication, 5G Technology, Present & Future Wireless Technologies, Digital Signal Processing, Computer Networks, Millimeter Wave Band Channel, Web Development
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