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diff --git a/gr-digital/lib/ofdm_carrier_allocator_cvc_impl.h b/gr-digital/lib/ofdm_carrier_allocator_cvc_impl.h
new file mode 100644
index 0000000000..6e478b3389
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+++ b/gr-digital/lib/ofdm_carrier_allocator_cvc_impl.h
@@ -0,0 +1,77 @@
+/* -*- 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_OFDM_CARRIER_ALLOCATOR_CVC_IMPL_H
+#define INCLUDED_DIGITAL_OFDM_CARRIER_ALLOCATOR_CVC_IMPL_H
+
+#include <digital/ofdm_carrier_allocator_cvc.h>
+
+namespace gr {
+  namespace digital {
+
+    class ofdm_carrier_allocator_cvc_impl : public ofdm_carrier_allocator_cvc
+    {
+     private:
+      //! FFT length
+      const int d_fft_len;
+      //! Which carriers/symbols carry data
+      std::vector<std::vector<int> > d_occupied_carriers;
+      //! Which carriers/symbols carry pilots symbols
+      std::vector<std::vector<int> > d_pilot_carriers;
+      //! Value of said pilot symbols
+      const std::vector<std::vector<gr_complex> > d_pilot_symbols;
+      //! Synch words
+      const std::vector<std::vector<gr_complex> > d_sync_words;
+      int d_symbols_per_set;
+      const bool d_output_is_shifted;
+
+     protected:
+      int calculate_output_stream_length(const gr_vector_int &ninput_items);
+
+     public:
+      ofdm_carrier_allocator_cvc_impl(
+	  int fft_len,
+	  const std::vector<std::vector<int> > &occupied_carriers,
+	  const std::vector<std::vector<int> > &pilot_carriers,
+	  const std::vector<std::vector<gr_complex> > &pilot_symbols,
+	  const std::vector<std::vector<gr_complex> > &sync_words,
+	  const std::string &len_tag_key,
+	  const bool output_is_shifted
+      );
+      ~ofdm_carrier_allocator_cvc_impl();
+
+      std::string len_tag_key() { return d_length_tag_key_str; };
+
+      const int fft_len() { return d_fft_len; };
+      std::vector<std::vector<int> > occupied_carriers() { return d_occupied_carriers; };
+
+      int work(int noutput_items,
+		 gr_vector_int &ninput_items,
+		 gr_vector_const_void_star &input_items,
+		 gr_vector_void_star &output_items);
+    };
+
+  } // namespace digital
+} // namespace gr
+
+#endif /* INCLUDED_DIGITAL_OFDM_CARRIER_ALLOCATOR_CVC_IMPL_H */
+