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H (ω) = M−1
−(iωn)
h=0 h (n) e = h (0) + h (1) e−(iω) + h (2) e−(i2ω) + · · · +
M−1
−(iω M−1
M−1
iω −(iω
h (M − 1) e −(iω(M−1)) = e
2 )
h (0) e
2 + · · · + h (M − 1) e
M−1
−(iω
e 2 ) (h (0) + h (M − 1)) cos M−1
2 ω + (h (1) + h (M − 2)) cos M−3
2 ω + · · · + i (h (0) − h (M − 1))
2 )
e −(iθ0) ω θ0 = 0
h (0) + h (M − 1) =
h (0) − h (M − 1) =
h (1) + h (M − 2) =
h (1) − h (M − 2) =
=