Merge branch 'ptrkrysik/trx' into development

16 files changed, 719 insertions, 5 deletions

diff --git a/include/grgsm/CMakeLists.txt b/include/grgsm/CMakeLists.txt
index d9b032d..2f76929 100644
--- a/include/grgsm/CMakeLists.txt
+++ b/include/grgsm/CMakeLists.txt
@@ -25,6 +25,7 @@ install(FILES
     api.h
     gsmtap.h
     constants.h
+    gsm_constants.h
     DESTINATION include/grgsm
 )
 
@@ -35,3 +36,4 @@ add_subdirectory(receiver)
 add_subdirectory(misc_utils)
 add_subdirectory(qa_utils)
 add_subdirectory(flow_control)
+add_subdirectory(transmitter)
diff --git a/include/grgsm/flow_control/CMakeLists.txt b/include/grgsm/flow_control/CMakeLists.txt
index 322c8c8..d86f1c7 100644
--- a/include/grgsm/flow_control/CMakeLists.txt
+++ b/include/grgsm/flow_control/CMakeLists.txt
@@ -27,6 +27,7 @@ install(FILES
     burst_timeslot_filter.h
     burst_sdcch_subslot_filter.h
     burst_fnr_filter.h
+    burst_type_filter.h
     dummy_burst_filter.h 
     uplink_downlink_splitter.h DESTINATION include/grgsm/flow_control
 )
diff --git a/include/grgsm/flow_control/burst_type_filter.h b/include/grgsm/flow_control/burst_type_filter.h
new file mode 100644
index 0000000..6430039
--- /dev/null
+++ b/include/grgsm/flow_control/burst_type_filter.h
@@ -0,0 +1,63 @@
+/* -*- c++ -*- */
+/* @file
+ * @author (C) 2017 by 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_BURST_TYPE_FILTER_H
+#define INCLUDED_GSM_BURST_TYPE_FILTER_H
+
+#include <grgsm/api.h>
+#include <gnuradio/block.h>
+#include <grgsm/flow_control/common.h>
+
+namespace gr {
+  namespace gsm {
+
+    /*!
+     * \brief <+description of block+>
+     * \ingroup gsm
+     *
+     */
+    class GRGSM_API burst_type_filter : virtual public gr::block
+    {
+     public:
+      typedef boost::shared_ptr<burst_type_filter> sptr;
+
+      /*!
+       * \brief Return a shared_ptr to a new instance of grgsm::burst_type_filter.
+       *
+       * To avoid accidental use of raw pointers, grgsm::burst_type_filter's
+       * constructor is in a private implementation
+       * class. grgsm::burst_type_filter::make is the public interface for
+       * creating new instances.
+       */
+       
+      static sptr make(const std::vector<uint8_t> & selected_burst_types);
+
+      /* External API */
+      /* Filtering policy */
+      virtual filter_policy get_policy(void) = 0;
+      virtual filter_policy set_policy(filter_policy policy) = 0;
+      virtual void set_selected_burst_types(const std::vector<uint8_t> & selected_burst_types) = 0;
+    };
+  } // namespace gsm
+} // namespace gr
+
+#endif /* INCLUDED_GSM_BURST_TYPE_FILTER_H */
diff --git a/include/grgsm/flow_control/uplink_downlink_splitter.h b/include/grgsm/flow_control/uplink_downlink_splitter.h
index 0dbc0bc..874c0b6 100644
--- a/include/grgsm/flow_control/uplink_downlink_splitter.h
+++ b/include/grgsm/flow_control/uplink_downlink_splitter.h
@@ -28,7 +28,7 @@
 #include <gnuradio/block.h>
 
 namespace gr {
-  namespace grgsm {
+  namespace gsm {
 
     /*!
      * \brief <+description of block+>
@@ -51,7 +51,7 @@ namespace gr {
       static sptr make();
     };
 
-  } // namespace grgsm
+  } // namespace gsm
 } // namespace gr
 
 #endif /* INCLUDED_GRGSM_UPLINK_DOWNLINK_SPLITTER_H */
diff --git a/include/grgsm/gsm_constants.h b/include/grgsm/gsm_constants.h
new file mode 100644
index 0000000..2fbfd36
--- /dev/null
+++ b/include/grgsm/gsm_constants.h
@@ -0,0 +1,178 @@
+/* -*- c++ -*- */
+/*
+ * @file
+ * @author (C) 2014 by 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_CONSTANTS_H
+#define INCLUDED_GSM_CONSTANTS_H
+
+#define GSM_SYMBOL_RATE  (1625000.0/6.0) //symbols per second
+#define GSM_SYMBOL_PERIOD (1.0/GSM_SYMBOL_RATE) //seconds per symbol
+
+//Burst timing
+#define TAIL_BITS         3
+#define GUARD_BITS        8
+#define GUARD_FRACTIONAL  0.25 //fractional part of guard period
+#define GUARD_PERIOD      GUARD_BITS + GUARD_FRACTIONAL
+#define DATA_BITS         57   //size of 1 data block in normal burst
+#define STEALING_BIT      1
+#define N_TRAIN_BITS      26
+#define N_SYNC_BITS       64
+#define USEFUL_BITS       142  //(2*(DATA_BITS+STEALING_BIT) + N_TRAIN_BITS )
+#define FCCH_BITS         USEFUL_BITS
+#define BURST_SIZE        (USEFUL_BITS+2*TAIL_BITS)
+#define ACCESS_BURST_SIZE 88
+#define PROCESSED_CHUNK   BURST_SIZE+2*GUARD_PERIOD
+
+#define SCH_DATA_LEN      39
+#define TS_BITS           (TAIL_BITS+USEFUL_BITS+TAIL_BITS+GUARD_BITS)  //a full TS (156 bits)
+#define TS_PER_FRAME      8
+#define FRAME_BITS        (TS_PER_FRAME * TS_BITS + 2) // 156.25 * 8
+#define FCCH_POS          TAIL_BITS
+#define SYNC_POS          39
+#define TRAIN_POS         ( TAIL_BITS + (DATA_BITS+STEALING_BIT) + 5) //first 5 bits of a training sequence
+                                                       //aren't used for channel impulse response estimation
+#define TRAIN_BEGINNING   5
+#define SAFETY_MARGIN     6   //
+
+#define FCCH_HITS_NEEDED        (USEFUL_BITS - 4)
+#define FCCH_MAX_MISSES         1
+#define FCCH_MAX_FREQ_OFFSET    100
+
+#define CHAN_IMP_RESP_LENGTH  5
+
+#define MAX_SCH_ERRORS    10  //maximum number of subsequent sch errors after which gsm receiver goes to find_next_fcch state
+
+typedef enum {empty, fcch_burst, sch_burst, normal_burst, rach_burst, dummy, dummy_or_normal, normal_or_noise} burst_type;
+typedef enum {unknown, multiframe_26, multiframe_51} multiframe_type;
+
+static const unsigned char SYNC_BITS[] = {
+  1, 0, 1, 1, 1, 0, 0, 1, 0, 1, 1, 0, 0, 0, 1, 0,
+  0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1,
+  0, 0, 1, 0, 1, 1, 0, 1, 0, 1, 0, 0, 0, 1, 0, 1,
+  0, 1, 1, 1, 0, 1, 1, 0, 0, 0, 0, 1, 1, 0, 1, 1
+};
+
+const unsigned FCCH_FRAMES[] = {0, 10, 20, 30, 40};
+const unsigned SCH_FRAMES[] = {1, 11, 21, 31, 41};
+
+const unsigned BCCH_FRAMES[] = {2, 3, 4, 5};          //!!the receiver shouldn't care about logical
+                                                      //!!channels so this will be removed from this header
+const unsigned TEST_CCH_FRAMES[] = {2, 3, 4, 5, 6, 7, 8, 9, 12, 13, 14, 15, 16, 17, 18, 19, 22, 23, 24, 25, 26, 27, 28, 29, 32, 33, 34, 35, 36, 37, 38, 39, 42, 43, 44, 45, 46, 47, 48, 49};
+const unsigned TRAFFIC_CHANNEL_F[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24};
+const unsigned TEST51[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50};
+
+
+#define TSC0  0
+#define TSC1  1
+#define TSC2  2
+#define TSC3  3
+#define TSC4  4
+#define TSC5  5
+#define TSC6  6
+#define TSC7  7
+#define TS_DUMMY 8
+
+#define TRAIN_SEQ_NUM 9
+
+#define TIMESLOT0  0
+#define TIMESLOT1  1
+#define TIMESLOT2  2
+#define TIMESLOT3  3
+#define TIMESLOT4  4
+#define TIMESLOT5  5
+#define TIMESLOT6  6
+#define TIMESLOT7  7
+
+
+static const unsigned char train_seq[TRAIN_SEQ_NUM][N_TRAIN_BITS] = {
+  {0, 0, 1, 0, 0, 1, 0, 1, 1, 1, 0, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 1, 0, 1, 1, 1},
+  {0, 0, 1, 0, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1, 1, 0, 0, 0, 1, 0, 0, 1, 0, 1, 1, 1},
+  {0, 1, 0, 0, 0, 0, 1, 1, 1, 0, 1, 1, 1, 0, 1, 0, 0, 1, 0, 0, 0, 0, 1, 1, 1, 0},
+  {0, 1, 0, 0, 0, 1, 1, 1, 1, 0, 1, 1, 0, 1, 0, 0, 0, 1, 0, 0, 0, 1, 1, 1, 1, 0},
+  {0, 0, 0, 1, 1, 0, 1, 0, 1, 1, 1, 0, 0, 1, 0, 0, 0, 0, 0, 1, 1, 0, 1, 0, 1, 1},
+  {0, 1, 0, 0, 1, 1, 1, 0, 1, 0, 1, 1, 0, 0, 0, 0, 0, 1, 0, 0, 1, 1, 1, 0, 1, 0},
+  {1, 0, 1, 0, 0, 1, 1, 1, 1, 1, 0, 1, 1, 0, 0, 0, 1, 0, 1, 0, 0, 1, 1, 1, 1, 1},
+  {1, 1, 1, 0, 1, 1, 1, 1, 0, 0, 0, 1, 0, 0, 1, 0, 1, 1, 1, 0, 1, 1, 1, 1, 0, 0},
+  {0, 1, 1, 1, 0, 0, 0, 1, 0, 1, 1, 1, 0, 0, 0, 1, 0, 1, 1, 1, 0, 0, 0, 1, 0, 1} // DUMMY
+};
+
+
+//Dummy burst 0xFB 76 0A 4E 09 10 1F 1C 5C 5C 57 4A 33 39 E9 F1 2F A8
+static const unsigned char dummy_burst[] = {
+  0, 0, 0, 
+  1, 1, 1, 1, 1, 0, 1, 1, 0, 1,
+  1, 1, 0, 1, 1, 0, 0, 0, 0, 0,
+  1, 0, 1, 0, 0, 1, 0, 0, 1, 1,
+  1, 0, 0, 0, 0, 0, 1, 0, 0, 1,
+  0, 0, 0, 1, 0, 0, 0, 0, 0, 0,
+  0, 1, 1, 1, 1, 1, 0, 0,
+
+  0, 1, 1, 1, 0, 0, 0, 1, 0, 1,
+  1, 1, 0, 0, 0, 1, 0, 1, 1, 1,
+  0, 0, 0, 1, 0, 1,
+
+  0, 1, 1, 1, 0, 1, 0, 0, 1, 0,
+  1, 0, 0, 0, 1, 1, 0, 0, 1, 1,
+  0, 0, 1, 1, 1, 0, 0, 1, 1, 1,
+  1, 0, 1, 0, 0, 1, 1, 1, 1, 1,
+  0, 0, 0, 1, 0, 0, 1, 0, 1, 1,
+  1, 1, 1, 0, 1, 0, 1, 0,
+  0, 0, 0
+};
+
+
+/*
+ * The frequency correction burst is used for frequency synchronization
+ * of the mobile.  This is broadcast in TS0 together with the SCH and
+ * BCCH.
+ *
+ * Modulating the bits below causes a spike at 62.5kHz above (below for
+ * COMPACT) the center frequency.  One can use this spike with a narrow
+ * band filter to accurately determine the center of the channel.
+ */
+static const unsigned char fc_fb[] = {
+  0, 0, 0,                                           //I don't use this tables,
+  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,    //I copied this here from burst_types.h because
+  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,    //the description is very informative - p.krysik
+  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0
+};
+
+static const unsigned char fc_compact_fb[] = {
+  1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0,
+  1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0,
+  1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0,
+  1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0,
+  1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0,
+  1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0,
+  1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0,
+  1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0,
+  1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0
+};
+
+
+#endif /* INCLUDED_GSM_CONSTANTS_H */
diff --git a/include/grgsm/misc_utils/CMakeLists.txt b/include/grgsm/misc_utils/CMakeLists.txt
index 2f7f4c3..0ec706c 100644
--- a/include/grgsm/misc_utils/CMakeLists.txt
+++ b/include/grgsm/misc_utils/CMakeLists.txt
@@ -35,5 +35,8 @@ install(FILES
     message_printer.h
     tmsi_dumper.h
     msg_to_tag.h
-    controlled_fractional_resampler_cc.h DESTINATION include/grgsm/misc_utils
+    trx_burst_if.h
+    controlled_fractional_resampler_cc.h 
+    time_spec.h
+    fn_time.h DESTINATION include/grgsm/misc_utils
 )
diff --git a/include/grgsm/misc_utils/controlled_fractional_resampler_cc.h b/include/grgsm/misc_utils/controlled_fractional_resampler_cc.h
index b085f94..9dae6b8 100644
--- a/include/grgsm/misc_utils/controlled_fractional_resampler_cc.h
+++ b/include/grgsm/misc_utils/controlled_fractional_resampler_cc.h
@@ -57,7 +57,7 @@ namespace gr {
       virtual void set_resamp_ratio(float resamp_ratio) = 0;
     };
 
-  } // namespace grgsm
+  } // namespace gsm
 } // namespace gr
 
 #endif /* INCLUDED_GRGSM_CONTROLLED_FRACTIONAL_RESAMPLER_CC_H */
diff --git a/include/grgsm/misc_utils/fn_time.h b/include/grgsm/misc_utils/fn_time.h
new file mode 100644
index 0000000..b26c21b
--- /dev/null
+++ b/include/grgsm/misc_utils/fn_time.h
@@ -0,0 +1,55 @@
+/* -*- c++ -*- */
+/* @file
+ * @author Piotr Krysik <ptrkrysik@gmail.com>
+ * @author Vadim Yanitskiy <axilirator@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_FN_TIME_H
+#define INCLUDED_GRGSM_FN_TIME_H
+
+#include <grgsm/api.h>
+#include <stdint.h>
+#include <utility>
+
+namespace gr {
+  namespace gsm {
+   
+    /**
+     * Computes difference between reference frame number
+     * and a second frame number. 
+     * @param  fn_ref    reference frame number modulo GSM_HYPER_FRAME
+     * @param  fn        second frame number modulo GSM_HYPER_FRAME
+     * @param  time_ref  precise timestamp of the first sample in the fn_ref
+     * @param  time_hint coarse time for fn that is used as a hint to avoid
+     *                   ambiguities caused by modulo operation applied to
+     *                   frame numbers
+     * @return           difference between fn_ref and fn
+     */
+     typedef std::pair<unsigned long long, double> time_format;
+     
+    GRGSM_API time_format fn_time_delta_cpp(uint32_t fn_ref, time_format time_ref, uint32_t fn_x,
+      time_format time_hint, uint32_t ts_num, uint32_t ts_ref);
+
+  } // namespace gsm
+} // namespace gr
+
+#endif /* INCLUDED_GRGSM_FN_TIME_H */
+
diff --git a/include/grgsm/misc_utils/msg_to_tag.h b/include/grgsm/misc_utils/msg_to_tag.h
index 87e2e78..c7b4e10 100644
--- a/include/grgsm/misc_utils/msg_to_tag.h
+++ b/include/grgsm/misc_utils/msg_to_tag.h
@@ -50,7 +50,7 @@ namespace gr {
       static sptr make();
     };
 
-  } // namespace grgsm
+  } // namespace gsm
 } // namespace gr
 
 #endif /* INCLUDED_GRGSM_MSG_TO_TAG_H */
diff --git a/include/grgsm/misc_utils/time_spec.h b/include/grgsm/misc_utils/time_spec.h
new file mode 100644
index 0000000..6ae5963
--- /dev/null
+++ b/include/grgsm/misc_utils/time_spec.h
@@ -0,0 +1,141 @@
+//
+// Copyright 2010-2012 Ettus Research LLC
+//
+// This program 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 of the License, or
+// (at your option) any later version.
+//
+// This program 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 program.  If not, see <http://www.gnu.org/licenses/>.
+//
+
+#ifndef INCLUDED_TYPES_TIME_SPEC_HPP
+#define INCLUDED_TYPES_TIME_SPEC_HPP
+
+#include <grgsm/api.h>
+#include <boost/operators.hpp>
+#include <ctime>
+
+namespace gr {
+  namespace gsm {
+
+    /*!
+     * A time_spec_t holds a seconds and a fractional seconds time value.
+     * Depending upon usage, the time_spec_t can represent absolute times,
+     * relative times, or time differences (between absolute times).
+     *
+     * The time_spec_t provides clock-domain independent time storage,
+     * but can convert fractional seconds to/from clock-domain specific units.
+     *
+     * The fractional seconds are stored as double precision floating point.
+     * This gives the fractional seconds enough precision to unambiguously
+     * specify a clock-tick/sample-count up to rates of several petahertz.
+     */
+    class GRGSM_API time_spec_t : boost::additive<time_spec_t>, boost::totally_ordered<time_spec_t>{
+    public:
+
+        /*!
+         * Copy constructor
+         */
+        time_spec_t(const time_spec_t & spec);
+
+        /*!
+         * Create a time_spec_t from a real-valued seconds count.
+         * \param secs the real-valued seconds count (default = 0)
+         */
+        time_spec_t(double secs = 0);
+
+        /*!
+         * Create a time_spec_t from whole and fractional seconds.
+         * \param full_secs the whole/integer seconds count
+         * \param frac_secs the fractional seconds count (default = 0)
+         */
+        time_spec_t(time_t full_secs, double frac_secs = 0);
+
+        /*!
+         * Create a time_spec_t from whole seconds and fractional ticks.
+         * Translation from clock-domain specific units.
+         * \param full_secs the whole/integer seconds count
+         * \param tick_count the fractional seconds tick count
+         * \param tick_rate the number of ticks per second
+         */
+        time_spec_t(time_t full_secs, long tick_count, double tick_rate);
+
+        /*!
+         * Create a time_spec_t from a 64-bit tick count.
+         * Translation from clock-domain specific units.
+         * \param ticks an integer count of ticks
+         * \param tick_rate the number of ticks per second
+         */
+        static time_spec_t from_ticks(long long ticks, double tick_rate);
+
+        /*!
+         * Convert the fractional seconds to clock ticks.
+         * Translation into clock-domain specific units.
+         * \param tick_rate the number of ticks per second
+         * \return the fractional seconds tick count
+         */
+        long get_tick_count(double tick_rate) const;
+
+        /*!
+         * Convert the time spec into a 64-bit tick count.
+         * Translation into clock-domain specific units.
+         * \param tick_rate the number of ticks per second
+         * \return an integer number of ticks
+         */
+        long long to_ticks(const double tick_rate) const;
+
+        /*!
+         * Get the time as a real-valued seconds count.
+         * Note: If this time_spec_t represents an absolute time,
+         * the precision of the fractional seconds may be lost.
+         * \return the real-valued seconds
+         */
+        double get_real_secs(void) const;
+
+        /*!
+         * Get the whole/integer part of the time in seconds.
+         * \return the whole/integer seconds
+         */
+        time_t get_full_secs(void) const;
+
+        /*!
+         * Get the fractional part of the time in seconds.
+         * \return the fractional seconds
+         */
+        double get_frac_secs(void) const;
+
+        //! Implement addable interface
+        time_spec_t &operator+=(const time_spec_t &);
+
+        //! Implement subtractable interface
+        time_spec_t &operator-=(const time_spec_t &);
+
+    //private time storage details
+    private: time_t _full_secs; double _frac_secs;
+    };
+
+    //! Implement equality_comparable interface
+    bool operator==(const time_spec_t &, const time_spec_t &);
+
+    //! Implement less_than_comparable interface
+    bool operator<(const time_spec_t &, const time_spec_t &);
+
+    inline time_t time_spec_t::get_full_secs(void) const{
+        return this->_full_secs;
+    }
+
+    inline double time_spec_t::get_frac_secs(void) const{
+        return this->_frac_secs;
+    }
+
+  } //namespace transceiver
+} //namespace gr
+
+#endif /* INCLUDED_TYPES_TIME_SPEC_HPP */
diff --git a/include/grgsm/misc_utils/trx_burst_if.h b/include/grgsm/misc_utils/trx_burst_if.h
new file mode 100644
index 0000000..0e7a35a
--- /dev/null
+++ b/include/grgsm/misc_utils/trx_burst_if.h
@@ -0,0 +1,59 @@
+/* -*- c++ -*- */
+/* @file
+ * @author Vadim Yanitskiy <axilirator@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_TRX_BURST_IF_H
+#define INCLUDED_GRGSM_TRX_BURST_IF_H
+
+#include <grgsm/api.h>
+#include <gnuradio/sync_block.h>
+
+namespace gr {
+  namespace gsm {
+
+    /*!
+     * \brief <+description of block+>
+     * \ingroup grgsm
+     *
+     */
+    class GRGSM_API trx_burst_if : virtual public gr::block
+    {
+     public:
+      typedef boost::shared_ptr<trx_burst_if> sptr;
+
+      /*!
+       * \brief Return a shared_ptr to a new instance of grgsm::trx_burst_if.
+       *
+       * To avoid accidental use of raw pointers, grgsm::trx_burst_if's
+       * constructor is in a private implementation
+       * class. grgsm::trx_burst_if::make is the public interface for
+       * creating new instances.
+       */
+      static sptr make(
+        const std::string &remote_addr,
+        const std::string &base_port);
+    };
+
+  } // namespace gsm
+} // namespace gr
+
+#endif /* INCLUDED_GRGSM_TRX_BURST_IF_H */
+
diff --git a/include/grgsm/qa_utils/burst_sink.h b/include/grgsm/qa_utils/burst_sink.h
index e12d027..774075f 100644
--- a/include/grgsm/qa_utils/burst_sink.h
+++ b/include/grgsm/qa_utils/burst_sink.h
@@ -25,6 +25,7 @@
 
 #include <grgsm/api.h>
 #include <gnuradio/block.h>
+#include <pmt/pmt.h>
 
 namespace gr {
   namespace gsm {
@@ -52,6 +53,7 @@ namespace gr {
       virtual std::vector<int> get_framenumbers() = 0;
       virtual std::vector<int> get_timeslots() = 0;
       virtual std::vector<std::string> get_burst_data() = 0;
+      virtual pmt::pmt_t get_bursts() = 0;      
     };
   } // namespace gsm
 } // namespace gr
diff --git a/include/grgsm/transmitter/CMakeLists.txt b/include/grgsm/transmitter/CMakeLists.txt
new file mode 100644
index 0000000..fab6f7c
--- /dev/null
+++ b/include/grgsm/transmitter/CMakeLists.txt
@@ -0,0 +1,28 @@
+# Copyright 2011,2012 Free Software Foundation, Inc.
+#
+# This file is part of GNU Radio
+#
+# GNU Radio 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.
+#
+# GNU Radio 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 GNU Radio; see the file COPYING.  If not, write to
+# the Free Software Foundation, Inc., 51 Franklin Street,
+# Boston, MA 02110-1301, USA.
+
+########################################################################
+# Install public header files
+########################################################################
+install(FILES
+    txtime_setter.h 
+    preprocess_tx_burst.h
+    gen_test_ab.h
+    DESTINATION include/grgsm/transmitter
+)
diff --git a/include/grgsm/transmitter/gen_test_ab.h b/include/grgsm/transmitter/gen_test_ab.h
new file mode 100644
index 0000000..d2756f1
--- /dev/null
+++ b/include/grgsm/transmitter/gen_test_ab.h
@@ -0,0 +1,60 @@
+/* -*- 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 */
+
diff --git a/include/grgsm/transmitter/preprocess_tx_burst.h b/include/grgsm/transmitter/preprocess_tx_burst.h
new file mode 100644
index 0000000..2a07dd5
--- /dev/null
+++ b/include/grgsm/transmitter/preprocess_tx_burst.h
@@ -0,0 +1,60 @@
+/* -*- 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_PREPROCESS_TX_BURST_H
+#define INCLUDED_GSM_PREPROCESS_TX_BURST_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 preprocess_tx_burst : virtual public gr::block
+    {
+     public:
+      typedef boost::shared_ptr<preprocess_tx_burst> sptr;
+
+      /*!
+       * \brief Return a shared_ptr to a new instance of gsm::preprocess_tx_burst.
+       *
+       * To avoid accidental use of raw pointers, gsm::preprocess_tx_burst's
+       * constructor is in a private implementation
+       * class. gsm::preprocess_tx_burst::make is the public interface for
+       * creating new instances.
+       */
+      static sptr make();
+    };
+
+  } // namespace gsm
+} // namespace gr
+
+#endif /* INCLUDED_GSM_PREPROCESS_TX_BURST_H */
+
diff --git a/include/grgsm/transmitter/txtime_setter.h b/include/grgsm/transmitter/txtime_setter.h
new file mode 100644
index 0000000..0bf0b03
--- /dev/null
+++ b/include/grgsm/transmitter/txtime_setter.h
@@ -0,0 +1,62 @@
+/* -*- 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_TXTIME_SETTER_H
+#define INCLUDED_GSM_TXTIME_SETTER_H
+
+#include <grgsm/api.h>
+#include <gnuradio/block.h>
+
+namespace gr {
+  namespace gsm {
+
+    /*!
+     * \brief <+description of block+>
+     * \ingroup gsm
+     *
+     */
+    class GRGSM_API txtime_setter : virtual public gr::block
+    {
+     public:
+      typedef boost::shared_ptr<txtime_setter> sptr;
+
+      /*!
+       * \brief Return a shared_ptr to a new instance of gsm::txtime_setter.
+       *
+       * To avoid accidental use of raw pointers, gsm::txtime_setter's
+       * constructor is in a private implementation
+       * class. gsm::txtime_setter::make is the public interface for
+       * creating new instances.
+       */
+      static sptr make(uint32_t init_fn, uint64_t init_time_secs, double init_time_fracs, uint64_t time_hint_secs, double time_hint_fracs, double timing_advance, double delay_correction);
+      virtual void set_fn_time_reference(uint32_t fn, uint32_t ts, uint64_t time_secs, double time_fracs) = 0;
+      virtual void set_time_hint(uint64_t time_hint_secs, double time_hint_fracs) = 0;
+      virtual void set_delay_correction(double delay_correction) = 0;
+      virtual void set_timing_advance(double timing_advance) = 0;
+    };
+
+  } // namespace gsm
+} // namespace gr
+
+#endif /* INCLUDED_GSM_TXTIME_SETTER_H */
+