- fdet.m pass Xm

- fdet_coarse.m use alternative approach
- fdet_wav.m added simple symbol decoding

git-svn-id: http://moon:8086/svn/matlab/trunk@28 801c6759-fa7c-4059-a304-17956f83a07c

ofdm/fdet_coarse.m

@@ -1,5 +1,23 @@
-function omega_coarse = fdet_coarse(x, N, omega_min, omega_step, omega_max)
+function [omega_coarse, Xm] = fdet_coarse(x, N, Ng, omega_min, omega_step, omega_max)
 
+Xm = zeros(N,1);
+
+if 0
+    
+K = fix((length(x))/(N+Ng));
+
+for k=1:K,
+    xp = x((k-1)*(N+Ng)+1:k*(N+Ng));
+    Xm = 0.5*Xm + fft(xp(Ng+1:N+Ng), N);
+end
+
+Nmax = ceil(omega_max*N)+1
+[v, ii] = max(abs(Xm(1:Nmax)))
+
+omega_coarse = (ii-1)/N;
+
+else
+    
 omega_range = (omega_min:omega_step:omega_max);
 
 for k=1:lge(omega_range)
@@ -9,3 +27,4 @@ end;
 [v maxk] = max(abs(dmod));
 omega_coarse = omega_range(maxk);
 
+end