A wide-sense stationary random process X(t) has a power of E(X_2(t)) = 4. Give at least one (that means one or more if they exist) reason why the following expressions cannot be its autocorrelation function: R_XX(t, t + tau) = 6 exp[-2 tau^2 – |tau|] R_XX(t, t + tau) = (0.5 + u(tau))/(1+ 8 tau^4)

1 4 - A wide-sense stationary random process X(t) has a power of E(X_2(t)) = 4. Give at least one (that means one or more if they exist) reason why the following expressions cannot be its autocorrelation function: R_XX(t, t + tau) = 6 exp[-2 tau^2 - |tau|] R_XX(t, t + tau) = (0.5 + u(tau))/(1+ 8 tau^4)

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images - A wide-sense stationary random process X(t) has a power of E(X_2(t)) = 4. Give at least one (that means one or more if they exist) reason why the following expressions cannot be its autocorrelation function: R_XX(t, t + tau) = 6 exp[-2 tau^2 - |tau|] R_XX(t, t + tau) = (0.5 + u(tau))/(1+ 8 tau^4)

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