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diff --git a/gr-digital/lib/ofdm_insert_preamble_impl.h b/gr-digital/lib/ofdm_insert_preamble_impl.h
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+++ b/gr-digital/lib/ofdm_insert_preamble_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 this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#ifndef INCLUDED_DIGITAL_OFDM_INSERT_PREAMBLE_IMPL_H
+#define INCLUDED_DIGITAL_OFDM_INSERT_PREAMBLE_IMPL_H
+
+#include <digital/ofdm_insert_preamble.h>
+
+namespace gr {
+  namespace digital {
+    
+    class ofdm_insert_preamble_impl : public ofdm_insert_preamble
+    {
+    private:
+      enum state_t {
+	ST_IDLE,
+	ST_PREAMBLE,
+	ST_FIRST_PAYLOAD,
+	ST_PAYLOAD
+      };
+
+      int     d_fft_length;
+      state_t d_state;
+      int     d_nsymbols_output;
+      int     d_pending_flag;
+      const std::vector<std::vector<gr_complex> > d_preamble;
+
+      void enter_idle();
+      void enter_first_payload();
+      void enter_payload();
+  
+    public:
+      ofdm_insert_preamble_impl(int fft_length,
+				const std::vector<std::vector<gr_complex> > &preamble);
+      ~ofdm_insert_preamble_impl();
+
+      void enter_preamble();
+
+      int general_work(int noutput_items,
+		    gr_vector_int &ninput_items,
+		    gr_vector_const_void_star &input_items,
+		    gr_vector_void_star &output_items);
+      void forecast(int noutput_items, gr_vector_int &ninput_items_required);
+    };
+
+  } /* namespace digital */
+} /* namespace gr */
+
+#endif /* INCLUDED_DIGITAL_OFDM_INSERT_PREAMBLE_IMPL_H */