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diff --git a/include/grgsm/transmitter/gen_test_ab.h b/include/grgsm/transmitter/gen_test_ab.h
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+++ b/include/grgsm/transmitter/gen_test_ab.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_GSM_GEN_TEST_AB_H
+#define INCLUDED_GSM_GEN_TEST_AB_H
+
+#include <grgsm/api.h>
+#include <gnuradio/block.h>
+
+namespace gr {
+  namespace gsm {
+
+    /*!
+     * \brief A block that does preprocessing tasks before sending bursts to modulator.
+     * \ingroup gsm
+     *
+     * Currently it removes GSMTAP header from a burst and puts it in first part of PDU
+     * pair and removes tailing zeros from Access Bursts coming from TRX interface.
+     */
+    class GRGSM_API gen_test_ab : virtual public gr::block
+    {
+     public:
+      typedef boost::shared_ptr<gen_test_ab> sptr;
+
+      /*!
+       * \brief Return a shared_ptr to a new instance of gsm::gen_test_ab.
+       *
+       * To avoid accidental use of raw pointers, gsm::gen_test_ab's
+       * constructor is in a private implementation
+       * class. gsm::gen_test_ab::make is the public interface for
+       * creating new instances.
+       */
+      static sptr make();
+    };
+
+  } // namespace gsm
+} // namespace gr
+
+#endif /* INCLUDED_GSM_GEN_TEST_AB_H */
+