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() (T) h(r) The filter h(t)is to reduce the noise and sampling is to obtain a measurement. We design the filter h(t)to obtain max-SNR in y(T),so that a GOOD measurement is obtained. UESTC-Digital transmission through the AWGN channel Prof李晓峰 4