Added CX channel hopper block
diff --git a/include/grgsm/receiver/cx_channel_hopper.h b/include/grgsm/receiver/cx_channel_hopper.h
new file mode 100644
index 0000000..7c0750c
--- /dev/null
+++ b/include/grgsm/receiver/cx_channel_hopper.h
@@ -0,0 +1,58 @@
+/* -*- 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_CX_CHANNEL_HOPPER_H
+#define INCLUDED_GSM_CX_CHANNEL_HOPPER_H
+
+#include <grgsm/api.h>
+#include <gnuradio/block.h>
+
+namespace gr {
+ namespace gsm {
+
+ /*!
+ * \brief <+description of block+>
+ * \ingroup gsm
+ *
+ */
+ class GSM_API cx_channel_hopper : virtual public gr::block
+ {
+ public:
+ typedef boost::shared_ptr<cx_channel_hopper> sptr;
+
+ /*!
+ * \brief Return a shared_ptr to a new instance of gsm::cx_channel_hopper.
+ *
+ * To avoid accidental use of raw pointers, gsm::cx_channel_hopper's
+ * constructor is in a private implementation
+ * class. gsm::cx_channel_hopper::make is the public interface for
+ * creating new instances.
+ */
+ static sptr make(int ma, int maio, int hsn);
+ };
+
+ } // namespace gsm
+} // namespace gr
+
+#endif /* INCLUDED_GSM_CX_CHANNEL_HOPPER_H */
+