Distilled function to generate hopping from cx_channel hopper
diff --git a/lib/misc_utils/freq_hopping_utils.h b/lib/misc_utils/freq_hopping_utils.h
new file mode 100644
index 0000000..df4cba2
--- /dev/null
+++ b/lib/misc_utils/freq_hopping_utils.h
@@ -0,0 +1,36 @@
+/* -*- 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_FREQ_HOPPING_UTILS_H
+#define INCLUDED_FREQ_HOPPING_UTILS_H
+
+namespace gr {
+ namespace gsm {
+ /*
+ * Slow Frequency Hopping (SFH) MAI calculation based
+ * on airprobe-hopping by Bogdan Diaconescu.
+ */
+ int calculate_ma_sfh(int maio, int hsn, int n, int fn);
+ } // namespace gsm
+} // namespace gr
+
+#endif /* INCLUDED_FREQ_HOPPING_UTILS_H */