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diff --git a/gr-digital/include/digital_mpsk_snr_est_cc.h b/gr-digital/include/digital_mpsk_snr_est_cc.h
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+++ b/gr-digital/include/digital_mpsk_snr_est_cc.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_MPSK_SNR_EST_CC_H
+#define INCLUDED_DIGITAL_MPSK_SNR_EST_CC_H
+
+#include <digital_api.h>
+#include <gr_sync_block.h>
+
+class digital_mpsk_snr_est_cc;
+typedef boost::shared_ptr<digital_mpsk_snr_est_cc> digital_mpsk_snr_est_cc_sptr;
+
+enum snr_est_type_t {
+  SNR_EST_SIMPLE = 0,	// Simple estimator (>= 7 dB)
+  SNR_EST_SKEW,	        // Skewness-base est (>= 5 dB)
+  SNR_EST_M2M4,         // 2nd & 4th moment est (>= 3 dB)
+  SNR_EST_SVN           // SVN-based est (>= 0dB)
+};
+
+DIGITAL_API digital_mpsk_snr_est_cc_sptr
+digital_make_mpsk_snr_est_cc(snr_est_type_t type, double alpha);
+
+/*!
+ * Provides various methods to compute SNR.
+ */
+class DIGITAL_API digital_mpsk_snr_est_cc : public gr_sync_block
+{
+ private:
+  snr_est_type_t d_type;
+  double d_y1, d_y2, d_y3, d_y4;
+  double d_alpha, d_beta;
+
+  // Function pointers to the type of estimator used.
+  int (digital_mpsk_snr_est_cc::*d_estimator)(int noutput_items,
+		 gr_vector_const_void_star &input_items,
+		 gr_vector_void_star &output_items);
+  double (digital_mpsk_snr_est_cc::*d_calculator)();
+
+  // Factory function returning shared pointer of this class
+  friend DIGITAL_API digital_mpsk_snr_est_cc_sptr
+    digital_make_mpsk_snr_est_cc(snr_est_type_t type, double alpha);
+  
+  // Private constructor
+  digital_mpsk_snr_est_cc(snr_est_type_t type, double alpha);
+
+  int est_simple(int noutput_items,
+		 gr_vector_const_void_star &input_items,
+		 gr_vector_void_star &output_items);
+  double est_simple_snr();
+
+  int est_skew(int noutput_items,
+	       gr_vector_const_void_star &input_items,
+	       gr_vector_void_star &output_items);
+  double est_skew_snr();
+
+  int est_m2m4(int noutput_items,
+	       gr_vector_const_void_star &input_items,
+	       gr_vector_void_star &output_items);
+  double est_m2m4_snr();
+
+  int est_svn(int noutput_items,
+	      gr_vector_const_void_star &input_items,
+	      gr_vector_void_star &output_items);
+  double est_svn_snr();
+  
+public:
+
+  ~digital_mpsk_snr_est_cc();
+
+  int work (int noutput_items,
+	    gr_vector_const_void_star &input_items,
+	    gr_vector_void_star &output_items);
+
+  //! Return the estimated signal-to-noise ratio in decibels
+  double snr();
+
+  //! Return the type of estimator in use
+  snr_est_type_t type() const;
+
+  //! Get the running-average coefficient
+  double alpha() const;
+
+  //! Set type of estimator to use
+  void set_type(snr_est_type_t t);
+
+  //! Set the running-average coefficient
+  void set_alpha(double alpha);
+};
+
+#endif /* INCLUDED_DIGITAL_MPSK_SNR_EST_CC_H */