[matlab] communication signal modulation general function - low pass filter

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low pass filter

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low pass filter

function [t,st] = lpf(f,sf,B)
%This function filter an input data using a lowpass filter at frequency domain
%Inputs:
% f: frequency samples
% sf: input data spectrum samples
% B: lowpass's bandwidth with a rectangle lowpass
%Outputs:
% t: time samples
% st: output data's time samples
df = f(2)-f(1);
T = 1/df;
hf = zeros(1,length(f));
bf = [-floor(B/df): floor(B/df)] + floor(length(f)/2);
hf(bf) = 1;
yf = hf.*sf;
[t,st] = F2T(f,yf);
st = real(st);