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This answer is not fundamentally different from the others; it's more of a complement and addendum. If $n(t)$ is zero-mean white Gaussian noise, then its variance is actually infinite; its power spect …
answered Oct 9 '15 by MBaz
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Since the basis functions are narrowband, the formula still works and the variance of each $n_j$ remains $N_0/2$.. In other words, assume the bandwidth of the basis functions is $B$. You can then thi …
answered Feb 24 by MBaz