5.5.2 Matched-filter type demodulator A Matched Filter (MF)to s(t)is defined as a LTI filter whose impulse response is as h(1)=Cs(T-1),where C is any non-zero constant and T is a given sample-time.. Consider a signal s(t)being corrupted as r(t)=s(t)+n(t),where n(t)is AWGN.Suppose that r(t)is measured as follows. Sampling r() y() y(I) h(r) Properties of MF: If a given signal is corrupted by AWGN,a matched filter to the signal maximizes the output SNR. Simply,MF is the optimal filter for this case UESTC-Digital transmission through the AWGN channel Prof李晓峰 5