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1. A matched filter has a frequency response given: The impulse response h(t) of the filter is :
(A): [δ(t) - δ(t - T]
(B): [S gn(t) + Sgn(t - T)]
(C): [S gn(t) - Sgn(t - t)]
(D): [u(t) - u(t - T)]
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