GNU Radio Manual and C++ API Reference 3.8.5.0
The Free & Open Software Radio Ecosystem
 
Loading...
Searching...
No Matches
polar_decoder_sc_systematic.h
Go to the documentation of this file.
1/* -*- c++ -*- */
2/*
3 * Copyright 2015 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
24#ifndef INCLUDED_FEC_POLAR_DECODER_SC_SYSTEMATIC_H
25#define INCLUDED_FEC_POLAR_DECODER_SC_SYSTEMATIC_H
26
27#include <gnuradio/fec/api.h>
29
30namespace gr {
31namespace fec {
32namespace code {
33
34/*!
35 * \brief Standard systematic successive cancellation (SC) decoder for POLAR codes
36 *
37 * \details
38 * It expects float input with bits mapped 1 --> 1, 0 --> -1
39 * Or: f = 2.0 * bit - 1.0
40 *
41 * Systematic encoding indicates that the info bit values are present in the codeword.
42 * 'info_bit_positions' may be obtained by ordering all non frozen_bit_positions in
43 * increasing order. One may extract them at their positions after a bit reversal
44 * operation. encoder -> decoder chain would need additional bit-reversal after encoding +
45 * before decoding. This is unnecessary.
46 */
48{
49public:
50 /*!
51 * \param block_size codeword size. MUST be a power of 2.
52 * \param num_info_bits represents the number of information
53 * bits in a block. Also called frame_size. <= block_size
54 * \param frozen_bit_positions is an integer vector which
55 * defines the position of all frozen bits in a block.
56 * Its size MUST be equal to block_size - num_info_bits.
57 * Also it must be sorted and every position must only
58 * occur once.
59 */
61 make(int block_size, int num_info_bits, std::vector<int> frozen_bit_positions);
62
64
65 // FECAPI
66 void generic_work(void* in_buffer, void* out_buffer);
67
68private:
69 polar_decoder_sc_systematic(int block_size,
70 int num_info_bits,
71 std::vector<int> frozen_bit_positions);
72 float* d_llr_vec;
73 unsigned char* d_u_hat_vec;
74 unsigned char* d_frame_vec;
75 unsigned char retrieve_bit_from_llr(float llr, const int pos);
76 void sc_decode(float* llrs, unsigned char* u);
77 void extract_info_bits_reversed(unsigned char* outbuf, const unsigned char* inbuf);
78};
79
80} /* namespace code */
81} // namespace fec
82} // namespace gr
83
84#endif /* INCLUDED_FEC_POLAR_DECODER_SC_SYSTEMATIC_H */
Class holds common methods and attributes for different decoder implementations.
Definition polar_decoder_common.h:40
Standard systematic successive cancellation (SC) decoder for POLAR codes.
Definition polar_decoder_sc_systematic.h:48
static generic_decoder::sptr make(int block_size, int num_info_bits, std::vector< int > frozen_bit_positions)
void generic_work(void *in_buffer, void *out_buffer)
boost::shared_ptr< generic_decoder > sptr
Definition generic_decoder.h:75
#define FEC_API
Definition gr-fec/include/gnuradio/fec/api.h:30
GNU Radio logging wrapper for log4cpp library (C++ port of log4j)
Definition basic_block.h:46