Added typical signalization channels (CCCH, BCCH, SDCCH) decoder and demapper for BCCH.
The implementation is quite dirty at this moment.
diff --git a/lib/decoding/control_channels_decoder_impl.h b/lib/decoding/control_channels_decoder_impl.h
new file mode 100644
index 0000000..41404fa
--- /dev/null
+++ b/lib/decoding/control_channels_decoder_impl.h
@@ -0,0 +1,48 @@
+/* -*- c++ -*- */
+/* 
+ * Copyright 2014 <+YOU OR YOUR COMPANY+>.
+ * 
+ * This 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.
+ * 
+ * This software 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 this software; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifndef INCLUDED_GSM_CONTROL_CHANNELS_DECODER_IMPL_H
+#define INCLUDED_GSM_CONTROL_CHANNELS_DECODER_IMPL_H
+
+#include <gsm/control_channels_decoder.h>
+#include "fire_crc.h"
+#include "cch.h"
+
+namespace gr {
+  namespace gsm {
+
+    class control_channels_decoder_impl : public control_channels_decoder
+    {
+     private:
+      unsigned int d_collected_bursts_num;
+      pmt::pmt_t d_bursts[4];
+      unsigned short interleave_trans[CONV_SIZE];      
+      FC_CTX fc_ctx;      
+      void decode(pmt::pmt_t msg);
+     public:
+      control_channels_decoder_impl();
+      ~control_channels_decoder_impl();
+    };
+
+  } // namespace gsm
+} // namespace gr
+
+#endif /* INCLUDED_GSM_CONTROL_CHANNELS_DECODER_IMPL_H */
+