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diff --git a/gr-digital/lib/corr_est_cc_impl.h b/gr-digital/lib/corr_est_cc_impl.h
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+++ b/gr-digital/lib/corr_est_cc_impl.h
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+/* -*- c++ -*- */
+/*
+ * Copyright 2013 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_CORR_EST_CC_IMPL_H
+#define INCLUDED_DIGITAL_CORR_EST_CC_IMPL_H
+
+#include <gnuradio/digital/corr_est_cc.h>
+#include <gnuradio/filter/fft_filter.h>
+
+using namespace gr::filter;
+
+namespace gr {
+  namespace digital {
+
+    class corr_est_cc_impl : public corr_est_cc
+    {
+    private:
+      pmt::pmt_t d_src_id;
+      std::vector<gr_complex> d_symbols;
+      float d_sps;
+      unsigned int d_mark_delay;
+      float d_thresh;
+      kernel::fft_filter_ccc *d_filter;
+
+      gr_complex *d_corr;
+      float *d_corr_mag;
+
+    public:
+      corr_est_cc_impl(const std::vector<gr_complex> &symbols,
+                       float sps, unsigned int mark_delay,
+                       float threshold=0.9);
+      ~corr_est_cc_impl();
+
+      std::vector<gr_complex> symbols() const;
+      void set_symbols(const std::vector<gr_complex> &symbols);
+
+      int work(int noutput_items,
+               gr_vector_const_void_star &input_items,
+               gr_vector_void_star &output_items);
+    };
+
+  } // namespace digital
+} // namespace gr
+
+#endif /* INCLUDED_DIGITAL_CORR_EST_CC_IMPL_H */