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- remove cyclic prefix

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git-svn-id: http://moon:8086/svn/matlab/trunk@21 801c6759-fa7c-4059-a304-17956f83a07c
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jens
2015-04-05 11:05:19 +00:00
parent 7e89f89dd5
commit 7154d5d94e
3 changed files with 10 additions and 11 deletions
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ofdm/fdet.m
+5 -7
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@@ -1,11 +1,8 @@
function [omega, err, dmod, omega_coarse, omega_est] = fdet(x, N, omega_min, omega_step, omega_max)
function [omega, err, dmod, omega_coarse, omega_est] = fdet(x, N, Ng, omega_min, omega_step, omega_max)
%
% Example: fdet_eval(1200, pi/4, -10, [1100 1350 1])
K = fix(length(x)/N);
% Initial guess
omega_coarse = fdet_coarse(x, N, omega_min, omega_step, omega_max);
K = fix(length(x-Ng)/(N+Ng));
% Initial guess
omega_coarse = fdet_coarse(x, N, omega_min, omega_step, omega_max);
@@ -13,11 +10,12 @@ omega_coarse = fdet_coarse(x, N, omega_min, omega_step, omega_max);
phi_est = 0;
omega_est = omega_coarse;
off = 0;
for k=1:K
omega(k) = omega_est;
xp = x((k-1)*N+1:k*N);
xp = x((k-1)*(N+Ng)+off+1:k*(N+Ng)+off);
x_est = exp(-j*(2*pi*omega_est*(0:N-1)' + phi_est));
dmod(k) = sum(xp.*x_est);
dmod(k) = sum(xp(Ng+1:N+Ng).*x_est);
phi = angle(dmod(k));
omega_f = phi/N/(2*pi);
err(k) = omega_f;