diff --git a/ofdm/fdet.m b/ofdm/fdet.m
new file mode 100644
index 0000000..eacf7b1
--- /dev/null
+++ b/ofdm/fdet.m
@@ -0,0 +1,27 @@
+function [omega, err, dmod, omega_coarse, omega_est] = fdet(x, N, 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);
+
+% Initial guess
+omega_coarse = fdet_coarse(x, N, omega_min, omega_step, omega_max);
+
+phi_est = 0;
+omega_est = omega_coarse;
+
+for k=1:K
+	omega(k) = omega_est;
+    xp = x((k-1)*N+1:k*N);
+    x_est = exp(-j*(2*pi*omega_est*(0:N-1)' + phi_est));
+    dmod(k) = sum(xp.*x_est);
+    phi = angle(dmod(k));
+    omega_f = phi/N/(2*pi);
+    err(k) = omega_f;
+    omega_est = omega_est + omega_f;
+    dphi_est = 2*pi*mod(omega_est*N, 1);
+    phi_est = mod(phi_est + dphi_est, 2*pi);
+end;