significance of Eb/No in digital communication

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xclusivevivek

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It is said that the Eb/No ratio in digital is equivalent to SNR in analog communication.Please explain how and what its importance
 

the probability of error is dependent on the quantity Eb/No usually the dependence is erfc(Eb/No), as the argument of erfc() increases , the prob. of error decreases, thus we need either high Eb or low No.

Eb/No is the SNR because Eb is the energy per bit for the clean signal and No is the noise PSD amplitude. The importance of Eb/No is thus of great importance and all BER and SER curves are plotted versus Eb/No.
 
Thanks for your reply .I have one more doubt about why energy is significant for digital signal but power for analog communication
 
I would say that in digital, you have the same piece of information throughout a bit duration, so you need the entire power that lasts through Tb; this is energy. But in Analog, information is instantaneous and Tb then tends to zero, thus we talk about power.
 
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