jens
2063f0ec37
git-svn-id: http://moon:8086/svn/matlab/trunk@23 801c6759-fa7c-4059-a304-17956f83a07c
48 lines
1.1 KiB
Matlab
48 lines
1.1 KiB
Matlab
function fdet_wav(filename, p)
|
|
%
|
|
% Example: fdet_wav('drm-15435-if.wav', [900 1000 10])
|
|
% Example: ofdm_tx(40, 1)
|
|
% fdet_wav('xv.wav', [700 800 1])
|
|
% or fdet_wav('yv.wav', [700 800 1])
|
|
|
|
close all;
|
|
fs = 48000;
|
|
fc = fs/4;
|
|
N = 1024;
|
|
Ng = 256;
|
|
|
|
omega_min = p(1)/fs;
|
|
omega_max = p(2)/fs;
|
|
omega_step = p(3)/fs;
|
|
|
|
% Generate signal
|
|
[xwav fs nbits] = wavread(filename);
|
|
|
|
[len ndim] = size(xwav);
|
|
|
|
if (ndim > 1)
|
|
fprintf('Mode: Baseband\n');
|
|
x = xwav(:, 1) + j*xwav(:, 2);
|
|
else
|
|
fprintf('Mode: Passband\n');
|
|
x = xwav.*exp(-j*(2*pi*fc/fs*(0:len-1)'));
|
|
end
|
|
|
|
[omega, err, dmod, omega_coarse, omega_est] = fdet(x, N, Ng, omega_min, omega_step, omega_max);
|
|
|
|
f_coarse = omega_coarse*fs
|
|
f_est = omega_est*fs
|
|
|
|
close all;
|
|
subplot(4,1,1)
|
|
plot(1:lge(omega), real(dmod)/N, 1:lge(omega), imag(dmod)/N, 1:lge(omega), abs(dmod)/N); grid; legend('Re', 'Im', 'abs()');
|
|
|
|
subplot(4,1,2)
|
|
plot(1:lge(omega), err*fs, '-'); grid; legend('error');
|
|
|
|
subplot(4,1,3)
|
|
plot(1:lge(omega), omega*fs); grid; legend('f');
|
|
|
|
subplot(4,1,4)
|
|
plot(1:lge(omega), angle(dmod), '-*', 1:lge(omega), diff(angle([0 dmod])), 'r-*'); grid; legend('phi', 'dphi');
|