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gr-ieee802-11/lib/ofdm_preamble.cc
T
Bastian Bloessl 58ed53a5d5 code changes
2013-10-10 11:06:36 +02:00

273 lines
14 KiB
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/*
* Copyright (C) 2013 Bastian Bloessl <bloessl@ccs-labs.org>
*
* 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/>.
*/
#include <ieee802-11/ofdm_preamble.h>
#include "utils.h"
#include <gnuradio/io_signature.h>
using namespace gr::ieee802_11;
class ofdm_preamble_impl : public ofdm_preamble {
static const int SYMBOL_LENGTH = 80;
public:
ofdm_preamble_impl(bool debug) : block("ofdm_preamble",
gr::io_signature::make(1, 1, sizeof(gr_complex)),
gr::io_signature::make(1, 1, sizeof(gr_complex))),
d_debug(debug),
d_state(IDLE) {
set_relative_rate(1);
set_output_multiple(SYMBOL_LENGTH);
set_tag_propagation_policy(block::TPP_DONT);
}
~ofdm_preamble_impl(){
}
int general_work (int noutput_items, gr_vector_int& ninput_items,
gr_vector_const_void_star& input_items,
gr_vector_void_star& output_items) {
int ninput = ninput_items[0] / SYMBOL_LENGTH;
//assert(ninput_items[0] % SYMBOL_LENGTH == 0);
int noutput = noutput_items / SYMBOL_LENGTH;
const gr_complex *in = (const gr_complex*)input_items[0];
gr_complex *out = (gr_complex*)output_items[0];
int written = 0;
int consumed = 0;
const uint64_t nread = this->nitems_read(0);
std::vector<gr::tag_t> tags;
pmt::pmt_t key = pmt::string_to_symbol("tx_sob");
pmt::pmt_t srcid = pmt::string_to_symbol(this->name());
dout << "OFDM PREAMBLE: input size: " << ninput_items[0] << " output size: "
<< noutput_items << std::endl;
while(written < noutput) {
// debug
dout << "OFDM PREAMBLE: iteration - consumed: " << consumed <<
" written:" << written << std::endl;
//assert((consumed + 1) * SYMBOL_LENGTH <= ninput_items[0]);
switch(d_state) {
case IDLE:
if(consumed >= ninput) {
goto out;
}
dout << "OFDM PREAMBLE: start of new frame" << std::endl;
get_tags_in_range(tags, 0, nread + consumed * SYMBOL_LENGTH,
nread + (consumed + 1) * SYMBOL_LENGTH - 1,
pmt::string_to_symbol("ofdm_start"));
// looks like we changed to modulation scheme during the frame
if(tags.size() != 1) {
std::cout << "PREAMBLE: frame is longer than expected" << std::endl;
throw std::runtime_error("PREAMBLE: frame is too long");
break;
}
d_frame_left = pmt::to_uint64(tags[0].value);
d_preamble_left = 4;
d_state = PRE;
// add tag to indicate start of odfm frame
add_item_tag(0, this->nitems_written(0) + written * SYMBOL_LENGTH, key, pmt::PMT_T, srcid);
// FALL THROUGH !!!!!
case PRE:
dout << "OFDM PREAMBLE: copy preamble" << std::endl;
memcpy(out, PREAMBLE + (4 - d_preamble_left) * SYMBOL_LENGTH,
SYMBOL_LENGTH * sizeof(gr_complex));
out += SYMBOL_LENGTH;
written++;
d_preamble_left--;
if(!d_preamble_left) {
d_state = FRAME;
}
break;
case FRAME:
if(consumed >= ninput) {
goto out;
}
dout << "OFDM PREAMBLE: copy frame" << std::endl;
memcpy(out, in, SYMBOL_LENGTH * sizeof(gr_complex));
consumed++;
in += SYMBOL_LENGTH;
out += SYMBOL_LENGTH;
written++;
d_frame_left--;
if(!d_frame_left) {
d_state = IDLE;
insert_eob(nitems_written(0) + written * SYMBOL_LENGTH -1);
goto out;
}
break;
default:
assert(false);
break;
}
}
out:
dout << "PREAMBLE: consumed " << consumed * SYMBOL_LENGTH;
dout << " written " << written * SYMBOL_LENGTH << std::endl;
consume(0, consumed * SYMBOL_LENGTH);
return written * SYMBOL_LENGTH;
}
void insert_eob(uint64_t item) {
dout << "OFDM PAD: insert eob at: " << item << std::endl;
const pmt::pmt_t eob_key = pmt::string_to_symbol("tx_eob");
const pmt::pmt_t value = pmt::PMT_T;
const pmt::pmt_t srcid = pmt::string_to_symbol(this->name());
add_item_tag(0, item, eob_key, value, srcid);
}
void
forecast (int noutput_items, gr_vector_int &ninput_items_required)
{
if(d_state == PRE) {
ninput_items_required[0] = 0;
} else {
ninput_items_required[0] = noutput_items;
}
dout << "forecast noutput_items: " << noutput_items << " required: " << ninput_items_required[0] << std::endl;
}
private:
bool d_debug;
size_t d_preamble_left;
size_t d_frame_left;
enum {IDLE, PRE, FRAME} d_state;
static gr_complex PREAMBLE[320];
};
ofdm_preamble::sptr
ofdm_preamble::make(bool debug) {
return gnuradio::get_initial_sptr(new ofdm_preamble_impl(debug));
}
gr_complex ofdm_preamble_impl::PREAMBLE[320] = {
gr_complex( 0.2041, 0.2041), gr_complex(-1.1755, 0.0208), gr_complex(-0.1196, -0.6969), gr_complex( 1.2670, -0.1123),
gr_complex( 0.8165, 0.0000), gr_complex( 1.2670, -0.1123), gr_complex(-0.1196, -0.6969), gr_complex(-1.1755, 0.0208),
gr_complex( 0.4082, 0.4082), gr_complex( 0.0208, -1.1755), gr_complex(-0.6969, -0.1196), gr_complex(-0.1123, 1.2670),
gr_complex( 0.0000, 0.8165), gr_complex(-0.1123, 1.2670), gr_complex(-0.6969, -0.1196), gr_complex( 0.0208, -1.1755),
gr_complex( 0.4082, 0.4082), gr_complex(-1.1755, 0.0208), gr_complex(-0.1196, -0.6969), gr_complex( 1.2670, -0.1123),
gr_complex( 0.8165, 0.0000), gr_complex( 1.2670, -0.1123), gr_complex(-0.1196, -0.6969), gr_complex(-1.1755, 0.0208),
gr_complex( 0.4082, 0.4082), gr_complex( 0.0208, -1.1755), gr_complex(-0.6969, -0.1196), gr_complex(-0.1123, 1.2670),
gr_complex( 0.0000, 0.8165), gr_complex(-0.1123, 1.2670), gr_complex(-0.6969, -0.1196), gr_complex( 0.0208, -1.1755),
gr_complex( 0.4082, 0.4082), gr_complex(-1.1755, 0.0208), gr_complex(-0.1196, -0.6969), gr_complex( 1.2670, -0.1123),
gr_complex( 0.8165, 0.0000), gr_complex( 1.2670, -0.1123), gr_complex(-0.1196, -0.6969), gr_complex(-1.1755, 0.0208),
gr_complex( 0.4082, 0.4082), gr_complex( 0.0208, -1.1755), gr_complex(-0.6969, -0.1196), gr_complex(-0.1123, 1.2670),
gr_complex( 0.0000, 0.8165), gr_complex(-0.1123, 1.2670), gr_complex(-0.6969, -0.1196), gr_complex( 0.0208, -1.1755),
gr_complex( 0.4082, 0.4082), gr_complex(-1.1755, 0.0208), gr_complex(-0.1196, -0.6969), gr_complex( 1.2670, -0.1123),
gr_complex( 0.8165, 0.0000), gr_complex( 1.2670, -0.1123), gr_complex(-0.1196, -0.6969), gr_complex(-1.1755, 0.0208),
gr_complex( 0.4082, 0.4082), gr_complex( 0.0208, -1.1755), gr_complex(-0.6969, -0.1196), gr_complex(-0.1123, 1.2670),
gr_complex( 0.0000, 0.8165), gr_complex(-0.1123, 1.2670), gr_complex(-0.6969, -0.1196), gr_complex( 0.0208, -1.1755),
gr_complex( 0.4082, 0.4082), gr_complex(-1.1755, 0.0208), gr_complex(-0.1196, -0.6969), gr_complex( 1.2670, -0.1123),
gr_complex( 0.8165, 0.0000), gr_complex( 1.2670, -0.1123), gr_complex(-0.1196, -0.6969), gr_complex(-1.1755, 0.0208),
gr_complex( 0.4082, 0.4082), gr_complex( 0.0208, -1.1755), gr_complex(-0.6969, -0.1196), gr_complex(-0.1123, 1.2670),
gr_complex( 0.0000, 0.8165), gr_complex(-0.1123, 1.2670), gr_complex(-0.6969, -0.1196), gr_complex( 0.0208, -1.1755),
gr_complex( 0.4082, 0.4082), gr_complex(-1.1755, 0.0208), gr_complex(-0.1196, -0.6969), gr_complex( 1.2670, -0.1123),
gr_complex( 0.8165, 0.0000), gr_complex( 1.2670, -0.1123), gr_complex(-0.1196, -0.6969), gr_complex(-1.1755, 0.0208),
gr_complex( 0.4082, 0.4082), gr_complex( 0.0208, -1.1755), gr_complex(-0.6969, -0.1196), gr_complex(-0.1123, 1.2670),
gr_complex( 0.0000, 0.8165), gr_complex(-0.1123, 1.2670), gr_complex(-0.6969, -0.1196), gr_complex( 0.0208, -1.1755),
gr_complex( 0.4082, 0.4082), gr_complex(-1.1755, 0.0208), gr_complex(-0.1196, -0.6969), gr_complex( 1.2670, -0.1123),
gr_complex( 0.8165, 0.0000), gr_complex( 1.2670, -0.1123), gr_complex(-0.1196, -0.6969), gr_complex(-1.1755, 0.0208),
gr_complex( 0.4082, 0.4082), gr_complex( 0.0208, -1.1755), gr_complex(-0.6969, -0.1196), gr_complex(-0.1123, 1.2670),
gr_complex( 0.0000, 0.8165), gr_complex(-0.1123, 1.2670), gr_complex(-0.6969, -0.1196), gr_complex( 0.0208, -1.1755),
gr_complex( 0.4082, 0.4082), gr_complex(-1.1755, 0.0208), gr_complex(-0.1196, -0.6969), gr_complex( 1.2670, -0.1123),
gr_complex( 0.8165, 0.0000), gr_complex( 1.2670, -0.1123), gr_complex(-0.1196, -0.6969), gr_complex(-1.1755, 0.0208),
gr_complex( 0.4082, 0.4082), gr_complex( 0.0208, -1.1755), gr_complex(-0.6969, -0.1196), gr_complex(-0.1123, 1.2670),
gr_complex( 0.0000, 0.8165), gr_complex(-0.1123, 1.2670), gr_complex(-0.6969, -0.1196), gr_complex( 0.0208, -1.1755),
gr_complex( 0.4082, 0.4082), gr_complex(-1.1755, 0.0208), gr_complex(-0.1196, -0.6969), gr_complex( 1.2670, -0.1123),
gr_complex( 0.8165, 0.0000), gr_complex( 1.2670, -0.1123), gr_complex(-0.1196, -0.6969), gr_complex(-1.1755, 0.0208),
gr_complex( 0.4082, 0.4082), gr_complex( 0.0208, -1.1755), gr_complex(-0.6969, -0.1196), gr_complex(-0.1123, 1.2670),
gr_complex( 0.0000, 0.8165), gr_complex(-0.1123, 1.2670), gr_complex(-0.6969, -0.1196), gr_complex( 0.0208, -1.1755),
gr_complex( 0.4082, 0.4082), gr_complex(-1.1755, 0.0208), gr_complex(-0.1196, -0.6969), gr_complex( 1.2670, -0.1123),
gr_complex( 0.8165, 0.0000), gr_complex( 1.2670, -0.1123), gr_complex(-0.1196, -0.6969), gr_complex(-1.1755, 0.0208),
gr_complex( 0.4082, 0.4082), gr_complex( 0.0208, -1.1755), gr_complex(-0.6969, -0.1196), gr_complex(-0.1123, 1.2670),
gr_complex( 0.0000, 0.8165), gr_complex(-0.1123, 1.2670), gr_complex(-0.6969, -0.1196), gr_complex( 0.0208, -1.1755),
gr_complex(-0.4893, 0.2041), gr_complex( 0.1090, -0.8662), gr_complex( 0.8140, -0.9396), gr_complex(-0.8155, -1.0218),
gr_complex(-0.0249, -0.4773), gr_complex( 0.6663, 0.6571), gr_complex(-1.1300, 0.1820), gr_complex(-1.0818, 0.1470),
gr_complex(-0.3110, 1.3392), gr_complex(-0.5011, 0.1935), gr_complex(-0.5353, -0.7214), gr_complex( 0.6173, -0.1253),
gr_complex( 0.7297, -0.8197), gr_complex(-1.1650, -0.5789), gr_complex(-0.5077, -0.3488), gr_complex( 0.3277, -0.8728),
gr_complex( 0.5547, 0.5547), gr_complex( 1.0583, 0.0363), gr_complex(-0.1995, -1.4259), gr_complex( 0.5207, 0.1326),
gr_complex( 0.2172, 0.5195), gr_complex(-1.2142, 0.4205), gr_complex( 0.0088, 1.0207), gr_complex( 0.4734, -0.0362),
gr_complex( 0.8657, 0.2298), gr_complex(-0.3401, 0.9423), gr_complex(-1.0218, 0.4897), gr_complex( 0.5309, 0.7784),
gr_complex( 0.1874, -0.2475), gr_complex( 0.8594, -0.7348), gr_complex( 0.3528, 0.9865), gr_complex(-0.0455, 1.0679),
gr_complex( 1.3868, 0.0000), gr_complex(-0.0455, -1.0679), gr_complex( 0.3528, -0.9865), gr_complex( 0.8594, 0.7348),
gr_complex( 0.1874, 0.2475), gr_complex( 0.5309, -0.7784), gr_complex(-1.0218, -0.4897), gr_complex(-0.3401, -0.9423),
gr_complex( 0.8657, -0.2298), gr_complex( 0.4734, 0.0362), gr_complex( 0.0088, -1.0207), gr_complex(-1.2142, -0.4205),
gr_complex( 0.2172, -0.5195), gr_complex( 0.5207, -0.1326), gr_complex(-0.1995, 1.4259), gr_complex( 1.0583, -0.0363),
gr_complex( 0.5547, -0.5547), gr_complex( 0.3277, 0.8728), gr_complex(-0.5077, 0.3488), gr_complex(-1.1650, 0.5789),
gr_complex( 0.7297, 0.8197), gr_complex( 0.6173, 0.1253), gr_complex(-0.5353, 0.7214), gr_complex(-0.5011, -0.1935),
gr_complex(-0.3110, -1.3392), gr_complex(-1.0818, -0.1470), gr_complex(-1.1300, -0.1820), gr_complex( 0.6663, -0.6571),
gr_complex(-0.0249, 0.4773), gr_complex(-0.8155, 1.0218), gr_complex( 0.8140, 0.9396), gr_complex( 0.1090, 0.8662),
gr_complex(-1.3868, 0.0000), gr_complex( 0.1090, -0.8662), gr_complex( 0.8140, -0.9396), gr_complex(-0.8155, -1.0218),
gr_complex(-0.0249, -0.4773), gr_complex( 0.6663, 0.6571), gr_complex(-1.1300, 0.1820), gr_complex(-1.0818, 0.1470),
gr_complex(-0.3110, 1.3392), gr_complex(-0.5011, 0.1935), gr_complex(-0.5353, -0.7214), gr_complex( 0.6173, -0.1253),
gr_complex( 0.7297, -0.8197), gr_complex(-1.1650, -0.5789), gr_complex(-0.5077, -0.3488), gr_complex( 0.3277, -0.8728),
gr_complex( 0.5547, 0.5547), gr_complex( 1.0583, 0.0363), gr_complex(-0.1995, -1.4259), gr_complex( 0.5207, 0.1326),
gr_complex( 0.2172, 0.5195), gr_complex(-1.2142, 0.4205), gr_complex( 0.0088, 1.0207), gr_complex( 0.4734, -0.0362),
gr_complex( 0.8657, 0.2298), gr_complex(-0.3401, 0.9423), gr_complex(-1.0218, 0.4897), gr_complex( 0.5309, 0.7784),
gr_complex( 0.1874, -0.2475), gr_complex( 0.8594, -0.7348), gr_complex( 0.3528, 0.9865), gr_complex(-0.0455, 1.0679),
gr_complex( 1.3868, 0.0000), gr_complex(-0.0455, -1.0679), gr_complex( 0.3528, -0.9865), gr_complex( 0.8594, 0.7348),
gr_complex( 0.1874, 0.2475), gr_complex( 0.5309, -0.7784), gr_complex(-1.0218, -0.4897), gr_complex(-0.3401, -0.9423),
gr_complex( 0.8657, -0.2298), gr_complex( 0.4734, 0.0362), gr_complex( 0.0088, -1.0207), gr_complex(-1.2142, -0.4205),
gr_complex( 0.2172, -0.5195), gr_complex( 0.5207, -0.1326), gr_complex(-0.1995, 1.4259), gr_complex( 1.0583, -0.0363),
gr_complex( 0.5547, -0.5547), gr_complex( 0.3277, 0.8728), gr_complex(-0.5077, 0.3488), gr_complex(-1.1650, 0.5789),
gr_complex( 0.7297, 0.8197), gr_complex( 0.6173, 0.1253), gr_complex(-0.5353, 0.7214), gr_complex(-0.5011, -0.1935),
gr_complex(-0.3110, -1.3392), gr_complex(-1.0818, -0.1470), gr_complex(-1.1300, -0.1820), gr_complex( 0.6663, -0.6571),
gr_complex(-0.0249, 0.4773), gr_complex(-0.8155, 1.0218), gr_complex( 0.8140, 0.9396), gr_complex( 0.1090, 0.8662),
gr_complex(-1.3868, 0.0000), gr_complex( 0.1090, -0.8662), gr_complex( 0.8140, -0.9396), gr_complex(-0.8155, -1.0218),
gr_complex(-0.0249, -0.4773), gr_complex( 0.6663, 0.6571), gr_complex(-1.1300, 0.1820), gr_complex(-1.0818, 0.1470),
gr_complex(-0.3110, 1.3392), gr_complex(-0.5011, 0.1935), gr_complex(-0.5353, -0.7214), gr_complex( 0.6173, -0.1253),
gr_complex( 0.7297, -0.8197), gr_complex(-1.1650, -0.5789), gr_complex(-0.5077, -0.3488), gr_complex( 0.3277, -0.8728),
gr_complex( 0.5547, 0.5547), gr_complex( 1.0583, 0.0363), gr_complex(-0.1995, -1.4259), gr_complex( 0.5207, 0.1326),
gr_complex( 0.2172, 0.5195), gr_complex(-1.2142, 0.4205), gr_complex( 0.0088, 1.0207), gr_complex( 0.4734, -0.0362),
gr_complex( 0.8657, 0.2298), gr_complex(-0.3401, 0.9423), gr_complex(-1.0218, 0.4897), gr_complex( 0.5309, 0.7784),
gr_complex( 0.1874, -0.2475), gr_complex( 0.8594, -0.7348), gr_complex( 0.3528, 0.9865), gr_complex(-0.0455, 1.0679)
};
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