I=1 j=1 aiajR(ti −tj) ≥ 0 To see why this is necessary, recall that the correlation matrix for a random vector must be nonnegative definite, so if we take a set of n samples from the WSS random process, their correlation matrix must be nonnegative definite The condition is sufficient since such an R(τ) can specify a zero mean. B r g e g ?. B r g e g ?.
;
q c cxg t
gcexg cxg
jjv cxg
u a l cxg
eg i cxg
