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diff --git a/gr-digital/lib/ofdm_frame_sink_impl.h b/gr-digital/lib/ofdm_frame_sink_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_FRAME_SINK_IMPL_H
+#define INCLUDED_DIGITAL_OFDM_FRAME_SINK_IMPL_H
+
+#include <digital/ofdm_frame_sink.h>
+
+namespace gr {
+  namespace digital {
+
+    class ofdm_frame_sink_impl : public ofdm_frame_sink
+    {
+    private:
+      enum state_t {STATE_SYNC_SEARCH, STATE_HAVE_SYNC, STATE_HAVE_HEADER};
+
+      static const int MAX_PKT_LEN    = 4096;
+      static const int HEADERBYTELEN   = 4;
+
+      gr_msg_queue_sptr  d_target_queue;	// where to send the packet when received
+      state_t            d_state;
+      unsigned int       d_header;		// header bits
+      int                d_headerbytelen_cnt;	// how many so far
+
+      char              *d_bytes_out;           // hold the current bytes produced by the demapper    
+
+      int                d_occupied_carriers;
+      unsigned int       d_byte_offset;
+      unsigned int       d_partial_byte;
+
+      char               d_packet[MAX_PKT_LEN];    // assembled payload
+      int 	         d_packetlen;              // length of packet
+      int                d_packet_whitener_offset; // offset into whitener string to use
+      int		 d_packetlen_cnt;          // how many so far
+
+      gr_complex * d_derotated_output;  // Pointer to output stream to send deroated symbols out
+
+      std::vector<gr_complex>    d_sym_position;
+      std::vector<char>          d_sym_value_out;
+      std::vector<gr_complex>    d_dfe;
+      unsigned int d_nbits;
+
+      char d_resid;
+      unsigned int d_nresid;
+      float d_phase;
+      float d_freq;
+      float d_phase_gain;
+      float d_freq_gain;
+      float d_eq_gain;
+
+      std::vector<int> d_subcarrier_map;
+
+    protected:
+      void enter_search();
+      void enter_have_sync();
+      void enter_have_header();
+  
+      bool header_ok()
+      {
+	// confirm that two copies of header info are identical
+	return ((d_header >> 16) ^ (d_header & 0xffff)) == 0;
+      }
+  
+      char slicer(const gr_complex x);
+      unsigned int demapper(const gr_complex *in,
+			    char *out);
+
+      bool set_sym_value_out(const std::vector<gr_complex> &sym_position, 
+			     const std::vector<char> &sym_value_out);
+
+    public:
+      ofdm_frame_sink_impl(const std::vector<gr_complex> &sym_position, 
+			   const std::vector<char> &sym_value_out,
+			   gr_msg_queue_sptr target_queue,
+			   int occupied_tones,
+			   float phase_gain=0.25, float freq_gain=0.25*0.25/4);
+      ~ofdm_frame_sink_impl();
+
+      int work(int noutput_items,
+	       gr_vector_const_void_star &input_items,
+	       gr_vector_void_star &output_items);
+    };
+
+  } /* namespace digital */
+} /* namespace gr */
+
+#endif /* INCLUDED_GR_OFDM_FRAME_SINK_IMPL_H */