diff --git a/lib/receiver_config.h b/lib/receiver_config.h
new file mode 100644
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--- /dev/null
+++ b/lib/receiver_config.h
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+/* -*- c++ -*- */
+/*
+ * @file
+ * @author Piotr Krysik <pkrysik@stud.elka.pw.edu.pl>
+ * @section LICENSE
+ *
+ * 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.
+ *
+ * @section DESCRIPTION
+ * This file contains classes which define gsm_receiver configuration
+ * and the burst_counter which is used to store internal state of the receiver
+ * when it's synchronized
+ */
+#ifndef INCLUDED_GSM_RECEIVER_CONFIG_H
+#define INCLUDED_GSM_RECEIVER_CONFIG_H
+
+#include <vector>
+#include <algorithm>
+#include <math.h>
+#include <stdint.h>
+#include <gsm_constants.h>
+
+class multiframe_configuration
+{
+  private:
+    multiframe_type d_type;
+    std::vector<burst_type> d_burst_types;
+  public:
+    multiframe_configuration() {
+      d_type = unknown;
+      fill(d_burst_types.begin(), d_burst_types.end(), empty);
+    }
+
+    ~multiframe_configuration() {}
+
+    void set_type(multiframe_type type) {
+      if (type == multiframe_26) {
+        d_burst_types.resize(26);
+      } else {
+        d_burst_types.resize(51);
+      }
+
+      d_type = type;
+    }
+
+    void set_burst_type(int nr, burst_type type) {
+      d_burst_types[nr] = type;
+    }
+
+    multiframe_type get_type() {
+      return d_type;
+    }
+
+    burst_type get_burst_type(int nr) {
+      return d_burst_types[nr];
+    }
+};
+
+class burst_counter
+{
+  private:
+    const int d_OSR;
+    uint32_t d_t1, d_t2, d_t3, d_timeslot_nr;
+    double d_offset_fractional;
+    double d_offset_integer;
+  public:
+    burst_counter(int osr):
+        d_OSR(osr),
+        d_t1(0),
+        d_t2(0),
+        d_t3(0),
+        d_timeslot_nr(0),
+        d_offset_fractional(0.0),
+        d_offset_integer(0.0) {
+    }
+
+    burst_counter(int osr, uint32_t t1, uint32_t t2, uint32_t t3, uint32_t timeslot_nr):
+        d_OSR(osr),
+        d_t1(t1),
+        d_t2(t2),
+        d_t3(t3),
+        d_timeslot_nr(timeslot_nr),
+        d_offset_fractional(0.0),
+        d_offset_integer(0.0) {
+      double first_sample_position = (get_frame_nr() * 8 + timeslot_nr) * TS_BITS;
+      d_offset_integer = floor(first_sample_position);
+      d_offset_fractional = first_sample_position - floor(first_sample_position);
+    }
+
+    burst_counter & operator++(int);
+    void set(uint32_t t1, uint32_t t2, uint32_t t3, uint32_t timeslot_nr);
+
+    uint32_t get_t1() {
+      return d_t1;
+    }
+
+    uint32_t get_t2() {
+      return d_t2;
+    }
+
+    uint32_t get_t3() {
+      return d_t3;
+    }
+
+    uint32_t get_timeslot_nr() {
+      return d_timeslot_nr;
+    }
+
+    uint32_t get_frame_nr() {
+      return (51 * 26 * d_t1) + (51 * (((d_t3 + 26) - d_t2) % 26)) + d_t3;
+    }
+    
+    uint32_t get_frame_nr_mod() {
+      return (d_t1 << 11) + (d_t3 << 5) + d_t2;
+    }
+
+    unsigned get_offset() {
+      return (unsigned)d_offset_integer;
+    }
+};
+
+class channel_configuration
+{
+  private:
+    multiframe_configuration d_timeslots_descriptions[TS_PER_FRAME];
+  public:
+    channel_configuration() {
+      for (int i = 0; i < TS_PER_FRAME; i++) {
+        d_timeslots_descriptions[i].set_type(unknown);
+      }
+    }
+
+    void set_multiframe_type(int timeslot_nr, multiframe_type type) {
+      d_timeslots_descriptions[timeslot_nr].set_type(type);
+    }
+
+    void set_burst_types(int timeslot_nr, const unsigned mapping[], unsigned mapping_size, burst_type b_type) {
+      unsigned i;
+      for (i = 0; i < mapping_size; i++) {
+        d_timeslots_descriptions[timeslot_nr].set_burst_type(mapping[i], b_type);
+      }
+    }
+
+    void set_single_burst_type(int timeslot_nr, int burst_nr, burst_type b_type) {
+      d_timeslots_descriptions[timeslot_nr].set_burst_type(burst_nr, b_type);
+    }
+
+    burst_type get_burst_type(burst_counter burst_nr);
+};
+
+#endif /* INCLUDED_GSM_RECEIVER_CONFIG_H */