1 /* -*- c++ -*- */ 2 /* 3 * Copyright 2007,2011,2012 Free Software Foundation, Inc. 4 * 5 * This file is part of GNU Radio 6 * 7 * GNU Radio is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License as published by 9 * the Free Software Foundation; either version 3, or (at your option) 10 * any later version. 11 * 12 * GNU Radio is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 * 17 * You should have received a copy of the GNU General Public License 18 * along with GNU Radio; see the file COPYING. If not, write to 19 * the Free Software Foundation, Inc., 51 Franklin Street, 20 * Boston, MA 02110-1301, USA. 21 */ 22 23 #ifndef INCLUDED_DIGITAL_OFDM_FRAME_SINK_IMPL_H 24 #define INCLUDED_DIGITAL_OFDM_FRAME_SINK_IMPL_H 25 26 #include <gnuradio/digital/ofdm_frame_sink.h> 27 28 namespace gr { 29 namespace digital { 30 31 class ofdm_frame_sink_impl : public ofdm_frame_sink 32 { 33 private: 34 enum state_t { STATE_SYNC_SEARCH, STATE_HAVE_SYNC, STATE_HAVE_HEADER }; 35 36 static const int MAX_PKT_LEN = 4096; 37 static const int HEADERBYTELEN = 4; 38 39 msg_queue::sptr d_target_queue; // where to send the packet when received 40 state_t d_state; 41 unsigned int d_header; // header bits 42 int d_headerbytelen_cnt; // how many so far 43 44 char* d_bytes_out; // hold the current bytes produced by the demapper 45 46 int d_occupied_carriers; 47 unsigned int d_byte_offset; 48 unsigned int d_partial_byte; 49 50 char d_packet[MAX_PKT_LEN]; // assembled payload 51 int d_packetlen; // length of packet 52 int d_packet_whitener_offset; // offset into whitener string to use 53 int d_packetlen_cnt; // how many so far 54 55 gr_complex* 56 d_derotated_output; // Pointer to output stream to send deroated symbols out 57 58 std::vector<gr_complex> d_sym_position; 59 std::vector<char> d_sym_value_out; 60 std::vector<gr_complex> d_dfe; 61 unsigned int d_nbits; 62 63 char d_resid; 64 unsigned int d_nresid; 65 float d_phase; 66 float d_freq; 67 float d_phase_gain; 68 float d_freq_gain; 69 float d_eq_gain; 70 71 std::vector<int> d_subcarrier_map; 72 73 protected: 74 void enter_search(); 75 void enter_have_sync(); 76 void enter_have_header(); 77 header_ok()78 bool header_ok() 79 { 80 // confirm that two copies of header info are identical 81 return ((d_header >> 16) ^ (d_header & 0xffff)) == 0; 82 } 83 84 char slicer(const gr_complex x); 85 unsigned int demapper(const gr_complex* in, char* out); 86 87 bool set_sym_value_out(const std::vector<gr_complex>& sym_position, 88 const std::vector<char>& sym_value_out); 89 90 public: 91 ofdm_frame_sink_impl(const std::vector<gr_complex>& sym_position, 92 const std::vector<char>& sym_value_out, 93 msg_queue::sptr target_queue, 94 int occupied_tones, 95 float phase_gain = 0.25, 96 float freq_gain = 0.25 * 0.25 / 4); 97 ~ofdm_frame_sink_impl(); 98 99 int work(int noutput_items, 100 gr_vector_const_void_star& input_items, 101 gr_vector_void_star& output_items); 102 }; 103 104 } /* namespace digital */ 105 } /* namespace gr */ 106 107 #endif /* INCLUDED_GR_OFDM_FRAME_SINK_IMPL_H */ 108