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diff --git a/gr-digital/include/digital_impl_mpsk_snr_est.h b/gr-digital/include/digital_impl_mpsk_snr_est.h
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+++ b/gr-digital/include/digital_impl_mpsk_snr_est.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_IMPL_MPSK_SNR_EST_H
+#define INCLUDED_DIGITAL_IMPL_MPSK_SNR_EST_H
+
+#include <digital_api.h>
+#include <gr_sync_block.h>
+
+/*!
+ * Parent class for SNR Estimators
+ */
+class DIGITAL_API digital_impl_mpsk_snr_est
+{
+ protected:
+  double d_alpha, d_beta;
+
+ public:
+  digital_impl_mpsk_snr_est(double alpha);
+  virtual ~digital_impl_mpsk_snr_est();
+
+  //! Get the running-average coefficient
+  double alpha() const;
+
+  //! Set the running-average coefficient
+  void set_alpha(double alpha);
+
+  //! Update the current registers
+  virtual int update(int noutput_items,
+		     gr_vector_const_void_star &input_items,
+		     gr_vector_void_star &output_items);
+
+  //! Use the register values to compute a new estimate
+  virtual double snr();
+};
+
+  
+class DIGITAL_API digital_impl_mpsk_snr_est_simple :
+  public digital_impl_mpsk_snr_est
+{
+ private:
+  double d_y1, d_y2;
+  
+ public:
+  digital_impl_mpsk_snr_est_simple(double alpha);
+  ~digital_impl_mpsk_snr_est_simple() {}
+
+  int update(int noutput_items,
+	     gr_vector_const_void_star &input_items,
+	     gr_vector_void_star &output_items);
+  double snr();
+};
+
+
+class DIGITAL_API digital_impl_mpsk_snr_est_skew :
+  public digital_impl_mpsk_snr_est
+{
+ private:
+  double d_y1, d_y2, d_y3;
+  
+ public:
+  digital_impl_mpsk_snr_est_skew(double alpha);
+  ~digital_impl_mpsk_snr_est_skew() {}
+
+  int update(int noutput_items,
+	     gr_vector_const_void_star &input_items,
+	     gr_vector_void_star &output_items);
+  double snr();
+};
+
+
+class DIGITAL_API digital_impl_mpsk_snr_est_m2m4 :
+  public digital_impl_mpsk_snr_est
+{
+ private:
+  double d_y1, d_y2;
+  
+ public:
+  digital_impl_mpsk_snr_est_m2m4(double alpha);
+  ~digital_impl_mpsk_snr_est_m2m4() {}
+
+  int update(int noutput_items,
+	     gr_vector_const_void_star &input_items,
+	     gr_vector_void_star &output_items);
+  double snr();
+};
+
+
+class DIGITAL_API digital_impl_mpsk_snr_est_svn :
+  public digital_impl_mpsk_snr_est
+{
+ private:
+  double d_y1, d_y2;
+  
+ public:
+  digital_impl_mpsk_snr_est_svn(double alpha);
+  ~digital_impl_mpsk_snr_est_svn() {}
+
+  int update(int noutput_items,
+	     gr_vector_const_void_star &input_items,
+	     gr_vector_void_star &output_items);
+  double snr();
+};
+
+#endif /* INCLUDED_DIGITAL_IMPL_MPSK_SNR_EST_H */