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how to find snr of a signal, which real value is unknown?

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saandeep

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snr

hi,
how to find snr of a signal which is corrupted by noise.only corrupted signal is available.noise and original signals are not available individually
 

snr

I think you can only estimate it, transmitting many different signals.
But you can not get the accurate SNR.
 

snr

Y(t)=X(t)+R.V~(mean=0,known variance)

You can use the info that noise is a RV that has a zero mean and is Wide Sense Stationary.
So, I think, when you can transmit the same signal X many times and monitor the o/p Y's.
The average of Y's is a good estimation of X, assuming you transmitted X infinity times.
 

Re: snr

hi,
let Y=X+N
i know only Y. if i average Y large no.of times i will get average of X.if average of X is 0 then what is SNR?? -infinity ??
 

snr

You should transmit the "Same" X many times.
You receive different Y's.
The Y's average is the X you are transmitting in case you transmitting so many times.

Added after 1 minutes:

As you see, you don't have to know X, but this X should be transmitted many times.
 

Re: snr

my question is very simple........what is its SNR??
 

snr

My answer is simple too :)
If you can transmit signal x many times (Same signal!),
so SNR=(energy of average signal of Y's)/(noise power)
 

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