Digital Communication System – Comparison

 

DIGITAL COMMUNICATION SYSTEM – COMPARISON (ASK- FSK- PSK- QAM):

S.NoParameterPSKDPSKQPSKQAMFSKASK
1Modulation ofPhasePhasePhaseAmplitude and PhaseFrequencyAmplitude
2Equation of transmitted signals(t)=b(t) √2Ps    (cos  2∏f0t)s(t)=b(t) √2Ps    (cos  2∏f0t)s(t)=b(t) √2Ps (cos  2∏f0t+(2m+1) ∏ / 4       m=0,1,2,3s(t)= k1√0.2P(cos  2∏f0t) + k2√0.2P(sin  2∏f0t)s(t)= √2Ps    [cos  2 (∏f0+d(t)Ω)t f-frequency shifts(t)= √2Ps    (cos  2∏f0t) for symbol ’1’=0 for symbol ‘0’
3Bits per symbolOneOneTwoNOneOne
4Number of possible symbols M= 2NTwoTwoFourM= 2NTwoTwo
5Detection methodCoherentNon-CoherentCoherentCoherentNon-CoherentCoherent
6Minimum Euclidean distance2√Eb2√Eb√0.4Es for M=16√2Eb√Eb
7Minimum Bandwidth(BW)2fbfbfb2fb/N4fb2fb
8Symbol duration(Ts)Tb2Tb2TbNTbTbTb

Comparison of various Digital Communication System

 

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