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diff --git a/gr-digital/lib/constellation_receiver_cb_impl.h b/gr-digital/lib/constellation_receiver_cb_impl.h
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+/* -*- c++ -*- */
+/*
+ * Copyright 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_CONSTELLATION_RECEIVER_CB_IMPL_H
+#define	INCLUDED_DIGITAL_CONSTELLATION_RECEIVER_CB_IMPL_H
+
+#include <digital/constellation_receiver_cb.h>
+#include <gruel/attributes.h>
+#include <gr_complex.h>
+#include <gri_control_loop.h>
+
+namespace gr {
+  namespace digital {
+
+    class constellation_receiver_cb_impl
+      : public constellation_receiver_cb, gri_control_loop
+    {
+    public:
+      constellation_receiver_cb_impl(constellation_sptr constell, 
+				     float loop_bw, float fmin, float fmax);
+
+      ~constellation_receiver_cb_impl();
+
+      int general_work(int noutput_items,
+		       gr_vector_int &ninput_items,
+		       gr_vector_const_void_star &input_items,
+		       gr_vector_void_star &output_items);
+
+    protected:
+      void phase_error_tracking(float phase_error);
+
+    private:
+      unsigned int d_M;
+
+      constellation_sptr d_constellation;
+      unsigned int d_current_const_point;
+
+      //! delay line length.
+      static const unsigned int DLLEN = 8;
+  
+      //! delay line plus some length for overflow protection
+      __GR_ATTR_ALIGNED(8) gr_complex d_dl[2*DLLEN];
+  
+      //! index to delay line
+      unsigned int d_dl_idx;
+    };
+
+  } /* namespace digital */
+} /* namespace gr */
+
+#endif /* INCLUDED_DIGITAL_CONSTELLATION_RECEIVER_CB_IMPL_H */