MATLAB Answers

Why matched filter in Simulink does not return the same results like in Matlab?

1 view (last 30 days)
Marcin Puchlik
Marcin Puchlik on 31 Oct 2018
Hi, I have a problem with matched filtering. In Matlab I create a script:
if true
noise_real = wgn(1,1000,5);
noise_imag = wgn(1,1000,5);
noise_complex = complex(noise_real,noise_imag);
noise.time = [];
noise.signals.dimensions = 1;
noise.signals.values = [noise_complex].';
template = noise_complex(400:499);
coeffictions = conj(template(end:-1:1));
coef.time = [];
coef.signals.dimensions = 1;
coef.signals.values = conj(template(end:-1:1)).';
mf_output = filter(coeffictions,1,noise_complex);
which provides me perfect matched filtration of generated noise. I wanted to create the same filtration in Simulink using "From Workspace" blocks separately for coefficients with cyclic repetition feature. I wast trying few kinds of filters without any result. I mean that I can't get the same plot from Simulink as I got from Matlab using metioned script. I am enclosing plot from matlab and simulink for comparison. Question is: how filter in Simulink works? Do they upload all samples and after accumulation of enough samples starting to perform convolution? How schould I perform my computation to obtain the same result like in Matlab. Thanks


Sign in to comment.

Answers (0)

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by