1 files changed, 99 insertions, 0 deletions
diff --git a/gr-digital/lib/digital_lms_dd_equalizer_cc.cc b/gr-digital/lib/digital_lms_dd_equalizer_cc.cc
new file mode 100644
index 0000000000..05a51fa2c8
--- /dev/null
+++ b/gr-digital/lib/digital_lms_dd_equalizer_cc.cc
@@ -0,0 +1,99 @@
+/* -*- 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.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <digital_lms_dd_equalizer_cc.h>
+#include <gr_io_signature.h>
+#include <gr_misc.h>
+#include <iostream>
+
+digital_lms_dd_equalizer_cc_sptr
+digital_make_lms_dd_equalizer_cc (float mu, int ntaps,
+				  digital_constellation_sptr cnst)
+{
+  return gnuradio::get_initial_sptr(new digital_lms_dd_equalizer_cc (mu, ntaps, cnst));
+}
+
+digital_lms_dd_equalizer_cc::digital_lms_dd_equalizer_cc (float mu, int ntaps,
+							  digital_constellation_sptr cnst)
+  : gr_sync_block ("lms_dd_equalizer_cc",
+		   gr_make_io_signature (1, 1, sizeof (gr_complex)),
+		   gr_make_io_signature (1, 1, sizeof (gr_complex))),
+    d_taps(ntaps), d_cnst(cnst)
+{
+  set_mu(mu);
+
+  gr_zero_vector(d_taps);
+  d_taps [d_taps.size()/2] = 1;
+
+  set_history(ntaps+1);
+}
+
+float
+digital_lms_dd_equalizer_cc::get_mu()
+{
+  return d_mu;
+}
+
+void
+digital_lms_dd_equalizer_cc::set_mu(float mu)
+{
+  if(mu < 0.0f || mu > 1.0f) {
+    throw std::out_of_range("digital_lms_dd_equalizer::set_mu: Gain value must in [0, 1]");
+  }
+  else {
+    d_mu = mu;
+  }
+}
+
+int
+digital_lms_dd_equalizer_cc::work (int noutput_items,
+				   gr_vector_const_void_star &input_items,
+				   gr_vector_void_star &output_items)
+{
+  const gr_complex *in = (const gr_complex *) input_items[0];
+  gr_complex *out = (gr_complex *) output_items[0];
+  
+  gr_complex acc, decision, error;
+
+  for(int i = 0; i < noutput_items; i++) {
+    acc = 0;
+
+    // Compute output
+    for (size_t j=0; j < d_taps.size(); j++) 
+      acc += in[i+j] * conj(d_taps[j]);
+    
+    d_cnst->map_to_points(d_cnst->decision_maker(&acc), &decision);
+    error = decision - acc;
+    
+    //  Update taps
+    for (size_t j=0; j < d_taps.size(); j++)
+      d_taps[j] += d_mu * conj(error) * in[i+j];
+    
+    out[i] = acc;   // Output decision
+  }
+
+  return noutput_items;
+}