The four-point DFTs of two discrete-time signals are
X[k] = [22, –4 + j2, – 6, –4 – j 2]
and
Y[k] = [8, – 2 – j2, 0, – 2 + j2].
(a) If υ[n] = x[n] *y[n], find υ[2].
(b) If
(c) Find Rxy[2].
(d) Find Ryx[2].
(e) Find Rxx[2].
(f) Calculate the periodogram spectral estimate of the signal x[n].
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