how can i perform matched filtering using fft in matlab to improve the SNR?

my purpose is to improve the snr by matched filtering.For this i've tried the procedure which includes R = fft(r);

H = conj(fft(s));

h = ifft(H);

Y = R.*H;

y = real(ifft(Y));

still thers is no change in the snr.please help me asap..

Answer 1

[Shivam Kumar Singh]

Let's assume that s is your signal in time domain.

There are two ways of creating a matched filter.

1.Do it youself.

b = conj(s(end:-1:1));
y = filter(b,1,x);

2. Use the built-in function from https://www.mathworks.com/help/phased/ug/matched-filtering.html

[ALEESHA JOJI]

hai

thank you for your response. but there is no change in the snr value,actually it is decreasing.