Does any body help me how to find the average (expectation) of terms involving double summation? Here is the equation which I'm trying solve.(adsbygoogle = window.adsbygoogle || []).push({});

[\tex]E\Big[2\sum_{k=0}^{N-2}\sum_{j=k+1}^{N-1}f(k,j)\cos[2\pi(j-k)t-\theta_{k,j}]\Big][\tex]

where f(k,j) and [\tex]\theta_{k,j}[\tex] are some function of k and j.

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# Expectation of terms in double summation

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