1 files changed, 28 insertions, 0 deletions
diff --git a/gr-digital/examples/ofdm/ofdm_sync.m b/gr-digital/examples/ofdm/ofdm_sync.m
new file mode 100644
index 000000000..d5df42137
--- /dev/null
+++ b/gr-digital/examples/ofdm/ofdm_sync.m
@@ -0,0 +1,28 @@
+%
+
+function [theta, g, g1, k, h] = ofdm_sync(signal,SNR,FFTSIZE,CPLEN)
+
+  rho = SNR/(SNR+1);
+
+  d = abs(signal).^2;
+  g = [ zeros(1,FFTSIZE) signal(1:max(size(signal))-FFTSIZE) ];
+  g1 = conj(g);
+  f = abs(g).^2;
+  c = d + f;
+  moving_sum_taps = rho/2 * ones(1,CPLEN);
+  b = conv(c,moving_sum_taps);
+  b = b(1:max(size(signal)));
+  %b = b(CPLEN:max(size(b)));
+  
+  k = g1 .* signal;
+
+  moving_sum_taps2 = ones(1, CPLEN);
+  h = conv(k,moving_sum_taps2);
+  h = h(1:max(size(signal)));
+  %h = h(CPLEN:max(size(h)));
+  
+  a = abs(h);
+  
+  theta = a-b;
+
+endfunction