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DFI of real sequences with odd harmonics only Let x(n) be an N-point real sequence with N-point DFT X(k) (N even). In addition, x(n) satisfied the following symmetry property:
x(n + N/2) = -x(n)n = 0, 1 ... N/2 - 1
that is, the upper half of the sequence is the negative of the lower half.
(a) Show that
X(k) = 0k even
that is, the sequence has a spectrum with odd harmonic.
(b) Show that the values of this odd-harmonic spectrum can be computed by evaluating the N/2-point DFT of a complex modulated version of the original sequence x(n).
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