add chunks to symbols block
This commit is contained in:
Bastian Bloessl
@@ -0,0 +1,144 @@
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/*
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* Copyright (C) 2013 Bastian Bloessl <bloessl@ccs-labs.org>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "chunks_to_symbols_impl.h"
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#include "utils.h"
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#include <gnuradio/io_signature.h>
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#include <gnuradio/tag_checker.h>
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#include <assert.h>
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using namespace gr::ieee802_11;
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chunks_to_symbols::sptr
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chunks_to_symbols::make()
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{
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return gnuradio::get_initial_sptr(new chunks_to_symbols_impl());
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}
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chunks_to_symbols_impl::chunks_to_symbols_impl()
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: tagged_stream_block("wifi_chunks_to_symbols",
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io_signature::make(1, 1, sizeof(char)),
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io_signature::make(1, 1, sizeof(gr_complex)), "packet_len") {
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}
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chunks_to_symbols_impl::~chunks_to_symbols_impl() { }
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int
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chunks_to_symbols_impl::work(int noutput_items,
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gr_vector_int &ninput_items,
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gr_vector_const_void_star &input_items,
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gr_vector_void_star &output_items) {
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const unsigned char *in = (unsigned char*)input_items[0];
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gr_complex *out = (gr_complex*)output_items[0];
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std::vector<tag_t> tags;
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get_tags_in_range(tags, 0, nitems_read(0),
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nitems_read(0) + ninput_items[0],
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pmt::mp("encoding"));
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if(tags.size() != 1) {
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throw std::runtime_error("no encoding in input stream");
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}
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Encoding encoding = (Encoding)pmt::to_long(tags[0].value);
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const gr_complex *mapping;
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switch (encoding) {
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case BPSK_1_2:
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case BPSK_3_4:
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mapping = BPSK;
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break;
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case QPSK_1_2:
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case QPSK_3_4:
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mapping = QPSK;
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break;
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case QAM16_1_2:
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case QAM16_3_4:
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mapping = QAM16;
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break;
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case QAM64_2_3:
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case QAM64_3_4:
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mapping = QAM64;
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break;
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default:
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throw std::invalid_argument("wrong encoding");
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break;
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}
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for(int i = 0; i < ninput_items[0]; i++) {
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out[i] = mapping[in[i]];
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}
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return ninput_items[0];
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}
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const gr_complex chunks_to_symbols_impl::BPSK[2] = {
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gr_complex(-1.0, 0.0), gr_complex(1.0, 0.0)};
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const gr_complex chunks_to_symbols_impl::QPSK[4] = {
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gr_complex(-0.7071, -0.7071), gr_complex(-0.7071, 0.7071),
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gr_complex(+0.7071, -0.7071), gr_complex(+0.7071, 0.7071)};
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const gr_complex chunks_to_symbols_impl::QAM16[16] = {
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gr_complex(-0.9487, -0.9487), gr_complex(-0.9487, -0.3162),
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gr_complex(-0.9487, 0.9487), gr_complex(-0.9487, 0.3162),
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gr_complex(-0.3162, -0.9487), gr_complex(-0.3162, -0.3162),
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gr_complex(-0.3162, 0.9487), gr_complex(-0.3162, 0.3162),
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gr_complex(0.9487, -0.9487), gr_complex(0.9487, -0.3162),
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gr_complex(0.9487, 0.9487), gr_complex(0.9487, 0.3162),
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gr_complex(0.3162, -0.9487), gr_complex(0.3162, -0.3162),
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gr_complex(0.3162, 0.9487), gr_complex(0.3162, 0.3162)};
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const gr_complex chunks_to_symbols_impl::QAM64[64] = {
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gr_complex(-1.0801, -1.0801), gr_complex(-1.0801, -0.7715),
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gr_complex(-1.0801, -0.1543), gr_complex(-1.0801, -0.4629),
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gr_complex(-1.0801, 1.0801), gr_complex(-1.0801, 0.7715),
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gr_complex(-1.0801, 0.1543), gr_complex(-1.0801, 0.4629),
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gr_complex(-0.7715, -1.0801), gr_complex(-0.7715, -0.7715),
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gr_complex(-0.7715, -0.1543), gr_complex(-0.7715, -0.4629),
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gr_complex(-0.7715, 1.0801), gr_complex(-0.7715, 0.7715),
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gr_complex(-0.7715, 0.1543), gr_complex(-0.7715, 0.4629),
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gr_complex(-0.1543, -1.0801), gr_complex(-0.1543, -0.7715),
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gr_complex(-0.1543, -0.1543), gr_complex(-0.1543, -0.4629),
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gr_complex(-0.1543, 1.0801), gr_complex(-0.1543, 0.7715),
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gr_complex(-0.1543, 0.1543), gr_complex(-0.1543, 0.4629),
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gr_complex(-0.4629, -1.0801), gr_complex(-0.4629, -0.7715),
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gr_complex(-0.4629, -0.1543), gr_complex(-0.4629, -0.4629),
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gr_complex(-0.4629, 1.0801), gr_complex(-0.4629, 0.7715),
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gr_complex(-0.4629, 0.1543), gr_complex(-0.4629, 0.4629),
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gr_complex(1.0801, -1.0801), gr_complex(1.0801, -0.7715),
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gr_complex(1.0801, -0.1543), gr_complex(1.0801, -0.4629),
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gr_complex(1.0801, 1.0801), gr_complex(1.0801, 0.7715),
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gr_complex(1.0801, 0.1543), gr_complex(1.0801, 0.4629),
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gr_complex(0.7715, -1.0801), gr_complex(0.7715, -0.7715),
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gr_complex(0.7715, -0.1543), gr_complex(0.7715, -0.4629),
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gr_complex(0.7715, 1.0801), gr_complex(0.7715, 0.7715),
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gr_complex(0.7715, 0.1543), gr_complex(0.7715, 0.4629),
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gr_complex(0.1543, -1.0801), gr_complex(0.1543, -0.7715),
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gr_complex(0.1543, -0.1543), gr_complex(0.1543, -0.4629),
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gr_complex(0.1543, 1.0801), gr_complex(0.1543, 0.7715),
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gr_complex(0.1543, 0.1543), gr_complex(0.1543, 0.4629),
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gr_complex(0.4629, -1.0801), gr_complex(0.4629, -0.7715),
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gr_complex(0.4629, -0.1543), gr_complex(0.4629, -0.4629),
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gr_complex(0.4629, 1.0801), gr_complex(0.4629, 0.7715),
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gr_complex(0.4629, 0.1543), gr_complex(0.4629, 0.4629)};
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