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diff --git a/gr-digital/include/digital_constellation_decoder_cb.h b/gr-digital/include/digital_constellation_decoder_cb.h
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+++ b/gr-digital/include/digital_constellation_decoder_cb.h
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+/* -*- c++ -*- */
+/*
+ * Copyright 2011 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_CONSTELLATION_DECODER_CB_H
+#define INCLUDED_DIGITAL_CONSTELLATION_DECODER_CB_H
+
+#include <gr_block.h>
+#include <digital_constellation.h>
+#include <vector>
+
+class digital_constellation_decoder_cb;
+typedef boost::shared_ptr<digital_constellation_decoder_cb>digital_constellation_decoder_cb_sptr;
+
+digital_constellation_decoder_cb_sptr 
+digital_make_constellation_decoder_cb (digital_constellation_sptr constellation);
+
+/*!
+ * \brief Constellation Decoder
+ * \ingroup coding_blk
+ * \ingroup digital
+ *
+ */
+class digital_constellation_decoder_cb : public gr_block
+{
+
+ private:
+  digital_constellation_sptr d_constellation;
+  unsigned int d_dim;
+
+  friend digital_constellation_decoder_cb_sptr 
+  digital_make_constellation_decoder_cb (digital_constellation_sptr constellation);
+  
+  digital_constellation_decoder_cb (digital_constellation_sptr constellation);
+
+ public:
+
+  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);
+};
+
+#endif