digital: added a class, digital_mpsk_snr_est_cc, that estimates the SNR of an M-ary PSK signal.

This block can calculate the SNR using 1 of 4 different methods specified in the block's constructor. They (tend to) trade off accuracy for computational performnace.

1 files changed, 46 insertions, 0 deletions

diff --git a/gr-digital/swig/digital_mpsk_snr_est_cc.i b/gr-digital/swig/digital_mpsk_snr_est_cc.i
new file mode 100644
index 000000000..cb61e9482
--- /dev/null
+++ b/gr-digital/swig/digital_mpsk_snr_est_cc.i
@@ -0,0 +1,46 @@
+/* -*- 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.
+ */
+
+GR_SWIG_BLOCK_MAGIC(digital,mpsk_snr_est_cc);
+
+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_mpsk_snr_est_cc_sptr
+digital_make_mpsk_snr_est_cc(snr_est_type_t type, double alpha);
+
+class digital_mpsk_snr_est_cc : public gr_sync_block
+{
+private:
+  void digital_mpsk_snr_est_cc(snr_est_type_t type, double alpha);
+
+public:
+  double snr();
+  snr_est_type_t type() const;
+  double alpha() const;
+  void set_type(snr_est_type_t t);
+  void set_alpha(double alpha);
+};