diff --git a/lib/controlled_fractional_resampler_cc_impl.h b/lib/controlled_fractional_resampler_cc_impl.h
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+++ b/lib/controlled_fractional_resampler_cc_impl.h
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+/* -*- c++ -*- */
+/* @file
+ * @author Piotr Krysik <ptrkrysik@gmail.com>
+ * @section LICENSE
+ * 
+ * Gr-gsm 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.
+ * 
+ * Gr-gsm 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 gr-gsm; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ * 
+ */
+
+#ifndef INCLUDED_GRGSM_CONTROLLED_FRACTIONAL_RESAMPLER_CC_IMPL_H
+#define INCLUDED_GRGSM_CONTROLLED_FRACTIONAL_RESAMPLER_CC_IMPL_H
+
+#include <grgsm/controlled_fractional_resampler_cc.h>
+//#include <gnuradio/filter/fractional_resampler_cc.h>
+#include <gnuradio/filter/mmse_fir_interpolator_cc.h>
+
+using namespace gr::filter;
+
+namespace gr {
+  namespace gsm {
+
+    class controlled_fractional_resampler_cc_impl : public controlled_fractional_resampler_cc
+    {
+    private:
+      float d_mu;
+      float d_mu_inc;
+      mmse_fir_interpolator_cc *d_resamp;
+
+      inline uint64_t resample(const gr_complex *in, 
+           uint64_t first_in_sample, 
+           gr_complex *out, 
+           uint64_t first_out_sample, 
+           uint64_t samples_to_produce);
+                                               
+    public:
+      controlled_fractional_resampler_cc_impl(float phase_shift,
+                                   float resamp_ratio);
+      ~controlled_fractional_resampler_cc_impl();
+
+      void forecast(int noutput_items,
+		       gr_vector_int &ninput_items_required);
+
+      int general_work(int noutput_items,
+		       gr_vector_int &ninput_items,
+		       gr_vector_const_void_star &input_items,
+		       gr_vector_void_star &output_items);
+
+
+      float mu() const;
+      float resamp_ratio() const;
+      void set_mu(float mu);
+      void set_resamp_ratio(float resamp_ratio);
+    };
+
+  } // namespace grgsm
+} // namespace gr
+
+#endif /* INCLUDED_GRGSM_CONTROLLED_FRACTIONAL_RESAMPLER_CC_IMPL_H */
+