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Diffstat (limited to 'gr-digital/lib/packet_header_ofdm.cc')
| -rw-r--r-- | gr-digital/lib/packet_header_ofdm.cc | 115 |
1 files changed, 115 insertions, 0 deletions
diff --git a/gr-digital/lib/packet_header_ofdm.cc b/gr-digital/lib/packet_header_ofdm.cc new file mode 100644 index 0000000000..db190c13bb --- /dev/null +++ b/gr-digital/lib/packet_header_ofdm.cc @@ -0,0 +1,115 @@ +/* -*- c++ -*- */ +/* Copyright 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. + */ + +#ifdef HAVE_CONFIG_H +#include "config.h" +#endif + +#include <digital/packet_header_ofdm.h> + +namespace gr { + namespace digital { + + int _get_header_len_from_occupied_carriers(const std::vector<std::vector<int> > &occupied_carriers, int n_syms) + { + int header_len = 0; + for (int i = 0; i < n_syms; i++) { + header_len += occupied_carriers[i].size(); + } + + return header_len; + } + + packet_header_ofdm::sptr + packet_header_ofdm::make( + const std::vector<std::vector<int> > &occupied_carriers, + int n_syms, + const std::string &len_tag_key, + const std::string &frame_len_tag_key, + const std::string &num_tag_key, + int bits_per_sym) + { + return packet_header_ofdm::sptr( + new packet_header_ofdm( + occupied_carriers, n_syms, len_tag_key, frame_len_tag_key, num_tag_key, bits_per_sym + ) + ); + } + + packet_header_ofdm::packet_header_ofdm( + const std::vector<std::vector<int> > &occupied_carriers, + int n_syms, + const std::string &len_tag_key, + const std::string &frame_len_tag_key, + const std::string &num_tag_key, + int bits_per_sym) + : packet_header_default( + _get_header_len_from_occupied_carriers(occupied_carriers, n_syms), + len_tag_key, + num_tag_key, + bits_per_sym), + d_frame_len_tag_key(pmt::pmt_string_to_symbol(frame_len_tag_key)), + d_occupied_carriers(occupied_carriers), + d_syms_per_set(0) + { + for (unsigned i = 0; i < d_occupied_carriers.size(); i++) { + d_syms_per_set += d_occupied_carriers[i].size(); + } + } + + packet_header_ofdm::~packet_header_ofdm() + { + } + + + bool packet_header_ofdm::header_parser( + const unsigned char *in, + std::vector<gr_tag_t> &tags) + { + if (!packet_header_default::header_parser(in, tags)) { + return false; + } + int packet_len = 0; // # of OFDM symbols + for (unsigned i = 0; i < tags.size(); i++) { + if (pmt::pmt_equal(tags[i].key, d_len_tag_key)) { + packet_len = pmt::pmt_to_long(tags[i].value); + break; + } + } + + int frame_len = packet_len / d_syms_per_set; + int k = 0; + int i = frame_len * d_syms_per_set; + while (i < packet_len) { + frame_len++; + i += d_occupied_carriers[k].size(); + } + gr_tag_t tag; + tag.key = d_frame_len_tag_key; + tag.value = pmt::pmt_from_long(frame_len); + tags.push_back(tag); + + return true; + } + + } /* namespace digital */ +} /* namespace gr */ + |