lpf.m

来自「自己做的一个OFDM系统的波形信道仿真,分成各种模块实现」· M 代码 · 共 16 行

function [t,st] = lpf(f,sf,B)
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);

% % 
% %                 _________________
% %                 |               |
% % ________________|               |________________
% % f(1)            -B      0       B             f(end)
% % -f/2                                          f/2