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Bounding Detection and Estimation by SNR in Gaussian Channel

Going directly for the variance is hard, because we don't know the pmf/pdf/cdf/moment-generating function/characterstic function/… of your $X$. What we can do, instead, is going through entropy, and ...
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Estimation of the attenuation of two waves on a linear sensor array

Since both waves are uncorrelated, cross correlation should do the trick here. If you calculate the cross correlation between any two antenna signals you will end up with two pronounced peaks, one at ...
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