Consider the following procedure
(a) Form the sequence v[n] = x2[2n] where x2[n] is given by Eq. (8.166). This yields
(b) Compute V [k], the N-point DFT of v[n].
Demonstrate that the following is true:
Note that this algorithm uses N-point rather than 2N-point DFTs as required in Eq. (8.167). In addition, since v[n] is a real sequence, we can exploit even and odd symmetries to do the computation of V [k] in one N/4-point complex DFT.
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