diff --git a/grc/digitalhf_vector_early_late_cc.xml b/grc/digitalhf_vector_early_late_cc.xml
new file mode 100644
index 0000000..ffcd40e
--- /dev/null
+++ b/grc/digitalhf_vector_early_late_cc.xml
@@ -0,0 +1,47 @@
+<?xml version="1.0"?>
+<block>
+  <name>vector_early_late_cc</name>
+  <key>digitalhf_vector_early_late_cc</key>
+  <category>[digitalhf]</category>
+  <import>import digitalhf</import>
+  <make>digitalhf.vector_early_late_cc($sps,$alpha)</make>
+  <callback>set_mu($mu)</callback>
+  <!-- Make one 'param' node for every Parameter you want settable from the GUI.
+       Sub-nodes:
+       * name
+       * key (makes the value accessible as $keyname, e.g. in the make node)
+       * type -->
+  <param>
+    <name>SPS</name>
+    <key>sps</key>
+    <type>int</type>
+  </param>
+
+  <param>
+    <name>alpha</name>
+    <key>alpha</key>
+    <type>float</type>
+  </param>
+
+  <!-- Make one 'sink' node per input. Sub-nodes:
+       * name (an identifier for the GUI)
+       * type
+       * vlen
+       * optional (set to 1 for optional inputs) -->
+  <sink>
+    <name>in</name>
+    <type>complex</type>
+  </sink>
+
+  <!-- Make one 'source' node per output. Sub-nodes:
+       * name (an identifier for the GUI)
+       * type
+       * vlen
+       * optional (set to 1 for optional inputs) -->
+  <source>
+    <name>out</name>
+    <type>complex</type>
+     <!-- byte, short, xxx_vector -->
+  </source>
+
+</block>
diff --git a/include/digitalhf/vector_early_late_cc.h b/include/digitalhf/vector_early_late_cc.h
new file mode 100644
index 0000000..117e0b4
--- /dev/null
+++ b/include/digitalhf/vector_early_late_cc.h
@@ -0,0 +1,58 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2018 hcab14@gmail.com.
+ *
+ * This 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.
+ *
+ * This software 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 this software; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+
+#ifndef INCLUDED_DIGITALHF_VECTOR_EARLY_LATE_CC_H
+#define INCLUDED_DIGITALHF_VECTOR_EARLY_LATE_CC_H
+
+#include <digitalhf/api.h>
+#include <gnuradio/block.h>
+
+namespace gr {
+namespace digitalhf {
+
+/*!
+ * \brief <+description of block+>
+ * \ingroup digitalhf
+ *
+ */
+class DIGITALHF_API vector_early_late_cc : virtual public gr::block
+{
+  public:
+  typedef boost::shared_ptr<vector_early_late_cc> sptr;
+
+  /*!
+   * \brief Return a shared_ptr to a new instance of digitalhf::vector_early_late_cc.
+   *
+   * To avoid accidental use of raw pointers, digitalhf::vector_early_late_cc's
+   * constructor is in a private implementation
+   * class. digitalhf::vector_early_late_cc::make is the public interface for
+   * creating new instances.
+   */
+  static sptr make(unsigned sps, // samples per symbols
+                   float alpha); // filter parameter
+
+};
+
+} // namespace digitalhf
+} // namespace gr
+
+#endif /* INCLUDED_DIGITALHF_VECTOR_EARLY_LATE_CC_H */
+
diff --git a/lib/CMakeLists.txt b/lib/CMakeLists.txt
index a08ad7e..a0a944e 100644
--- a/lib/CMakeLists.txt
+++ b/lib/CMakeLists.txt
@@ -32,7 +32,11 @@ list(APPEND digitalhf_sources
     viterbi29_impl.cc
     viterbi39_impl.cc
     viterbi48_impl.cc
-    vector_pll_cc_impl.cc)
+    vector_pll_cc_impl.cc
+    vector_early_late_cc_impl.cc
+    lms.cc
+    rls.cc
+    )
 
 set(digitalhf_sources "${digitalhf_sources}" PARENT_SCOPE)
 if(NOT digitalhf_sources)
diff --git a/lib/vector_early_late_cc_impl.cc b/lib/vector_early_late_cc_impl.cc
new file mode 100644
index 0000000..cd1a1ca
--- /dev/null
+++ b/lib/vector_early_late_cc_impl.cc
@@ -0,0 +1,122 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2018 hcab14@gmail.com.
+ *
+ * This 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.
+ *
+ * This software 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 this software; 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 <cmath>
+
+#include <gnuradio/io_signature.h>
+#include <gnuradio/expj.h>
+#include <gnuradio/logger.h>
+
+#include "vector_early_late_cc_impl.h"
+
+namespace gr {
+namespace digitalhf {
+
+vector_early_late_cc::sptr
+vector_early_late_cc::make(unsigned sps,
+                           float alpha)
+{
+  return gnuradio::get_initial_sptr
+    (new vector_early_late_cc_impl(sps, alpha));
+}
+
+/*
+ * The private constructor
+ */
+vector_early_late_cc_impl::vector_early_late_cc_impl(unsigned sps,
+                                                     float alpha)
+  : gr::block("vector_early_late_cc",
+              gr::io_signature::make(1, 1, sizeof(gr_complex)),
+              gr::io_signature::make(1, 1, sizeof(gr_complex)))
+  , _sps(sps)
+  , _alpha(alpha)
+  , _counter(0)
+  , _err(0.0f)
+  , _t(0.0f)
+{
+  GR_LOG_DECLARE_LOGPTR(d_logger);
+  GR_LOG_ASSIGN_LOGPTR(d_logger, "vector_early_late_cc");
+
+  // -sps/2 ... -1 0 1 ... sps/2
+  // [   early   ]   [  late   ]
+  set_history(1 + sps);
+}
+
+vector_early_late_cc_impl::~vector_early_late_cc_impl()
+{
+}
+
+int
+vector_early_late_cc_impl::general_work(int noutput_items,
+                                        gr_vector_int& ninput_items,
+                                        gr_vector_const_void_star& input_items,
+                                        gr_vector_void_star& output_items)
+{
+  gr::thread::scoped_lock lock(d_setlock);
+
+  gr_complex const *in = (gr_complex const *)input_items[0];
+  gr_complex *out      = (gr_complex *)output_items[0];
+
+  int const nin = ninput_items[0] - _sps;
+//  std::cout << "vector_early_late_cc_impl::general_work nin,sps= " << " " << nin << " " << _sps << " " << history() << std::endl;
+  assert(nin > 1);
+  if (nin < 1)
+    return 0;
+
+  int nout = 0;
+  int nin_processed = 0;
+  int i = history();
+  for (; i<ninput_items[0]-_sps/2 && nout<noutput_items; ++i) {
+    if (_counter == std::floor(_t)) {
+      // evaluate early and late
+      gr_complex early(0), late(0);
+//      float early(0), late(0);
+      for (int j=0; j<_sps; ++j) {
+        early += std::real(in[i-j]);
+        late  += std::real(in[i+1+j]);
+      }
+      // output symbol
+      gr_complex _out(0);
+      for (int j=0; j<_sps; ++j) {
+        _out += in[i-j];
+      }
+//      out[nout++] = _out*(1.0f/(_sps-2));
+      out[nout++] = _out*(1.0f/_sps);
+
+      float const error = (std::real(early - late)*std::real(in[i]) +
+                           std::imag(early - late)*std::imag(in[i]));
+//      float const error = (std::real(early) - std::real(late))*std::real(in[i]);
+      _err = (1.0f - _alpha)*_err + _alpha * error;
+      _t  += float(_sps) - float(_counter) + 0.5*_err;
+      std::cout << "EL: err= "<< _err << " early/late= " << std::abs(early) << " " << std::abs(late) << " t= " << _t << std::endl;
+      _counter = 0;
+    }
+    consume(0, 1);
+    _counter +=1;
+  }
+  return nout;
+}
+
+} /* namespace digitalhf */
+} /* namespace gr */
diff --git a/lib/vector_early_late_cc_impl.h b/lib/vector_early_late_cc_impl.h
new file mode 100644
index 0000000..54b828a
--- /dev/null
+++ b/lib/vector_early_late_cc_impl.h
@@ -0,0 +1,60 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2018 hcab14@gmail.com.
+ *
+ * This 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.
+ *
+ * This software 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 this software; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifndef INCLUDED_DIGITALHF_VECTOR_EARLY_LATE_CC_IMPL_H
+#define INCLUDED_DIGITALHF_VECTOR_EARLY_LATE_CC_IMPL_H
+
+#include <gnuradio/blocks/control_loop.h>
+
+#include <digitalhf/vector_early_late_cc.h>
+
+#include <array>
+
+namespace gr {
+namespace digitalhf {
+
+class vector_early_late_cc_impl : public vector_early_late_cc
+{
+private:
+  // filter configuration
+  unsigned _sps;
+  float    _alpha;
+
+  // filter state
+  int   _counter;
+  float _err;
+  float _t;
+public:
+  vector_early_late_cc_impl(unsigned sps,
+                            float alpha);
+  virtual ~vector_early_late_cc_impl();
+
+  virtual 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:
+
+};
+
+} // namespace digitalhf
+} // namespace gr
+
+#endif /* INCLUDED_DIGITALHF_VECTOR_EARLY_LATE_CC_IMPL_H */
diff --git a/swig/digitalhf_swig.i b/swig/digitalhf_swig.i
index bac2e49..b274719 100644
--- a/swig/digitalhf_swig.i
+++ b/swig/digitalhf_swig.i
@@ -15,6 +15,7 @@
 #include "digitalhf/viterbi39.h"
 #include "digitalhf/viterbi48.h"
 #include "digitalhf/vector_pll_cc.h"
+#include "digitalhf/vector_early_late_cc.h"
 %}
 
 %include "digitalhf/adaptive_dfe.h"
@@ -26,6 +27,9 @@ GR_SWIG_BLOCK_MAGIC2(digitalhf, doppler_correction_cc);
 %include "digitalhf/vector_pll_cc.h"
 GR_SWIG_BLOCK_MAGIC2(digitalhf, vector_pll_cc);
 
+%include "digitalhf/vector_early_late_cc.h"
+GR_SWIG_BLOCK_MAGIC2(digitalhf, vector_early_late_cc);
+
 /* FIXME */
 %include "digitalhf/viterbi27.h"
 GR_SWIG_BLOCK_MAGIC2(digitalhf, viterbi27);