What is the energy density spectrum of the signal X(n) = anU(n), -1 < – McqOptions

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1.	What is the energy density spectrum of the signal X(n) = anU(n), -1 < a < 1?
A.	\(\frac{1}{{1 + 2a\cos + {a^2}}}\)
B.	\(\frac{1}{{1 + 2a\cos \omega + {a^2}}}\)
C.	\(- \frac{1}{{1 + 2a\cos + {a^2}}}\)
D.	\(\frac{1}{{1 - 2a\cos \omega + {a^2}}}\)
Answer» E.

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