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diff --git a/gr-digital/lib/ofdm_sampler_impl.h b/gr-digital/lib/ofdm_sampler_impl.h
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+++ b/gr-digital/lib/ofdm_sampler_impl.h
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+/* -*- c++ -*- */
+/*
+ * Copyright 2007,2011,2012 Free Software Foundation, Inc.
+ * 
+ * This file is part of GNU Radio
+ * 
+ * GNU Radio is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3, or (at your option)
+ * any later version.
+ * 
+ * GNU Radio is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with GNU Radio; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifndef INCLUDED_DIGITAL_OFDM_SAMPLER_IMPL_H
+#define INCLUDED_DIGITAL_OFDM_SAMPLER_IMPL_H
+
+#include <digital/ofdm_sampler.h>
+#include <gr_sync_block.h>
+
+namespace gr {
+  namespace digital {
+    
+    class ofdm_sampler_impl : public ofdm_sampler
+    {
+    private:
+      enum state_t {STATE_NO_SIG, STATE_PREAMBLE, STATE_FRAME};
+
+      state_t d_state;
+      unsigned int d_timeout_max;
+      unsigned int d_timeout;
+      unsigned int d_fft_length;
+      unsigned int d_symbol_length;
+
+    public:
+      ofdm_sampler_impl(unsigned int fft_length, 
+			unsigned int symbol_length,
+			unsigned int timeout=1000);
+      ~ofdm_sampler_impl();
+
+      void forecast(int noutput_items, gr_vector_int &ninput_items_required);
+
+      int general_work(int noutput_items,
+		       gr_vector_int &ninput_items,
+		       gr_vector_const_void_star &input_items,
+		       gr_vector_void_star &output_items);
+    };
+
+  } /* namespace digital */
+} /* namespace gr */
+
+#endif /* INCLUDED_DIGITAL_OFDM_SAMPLER_IMPL_H */