200 lines
5.9 KiB
C
200 lines
5.9 KiB
C
/* GMR-1 convolutional coding */
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/* See GMR-1 05.003 (ETSI TS 101 376-5-3 V1.2.1) - Section 4.4 */
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/* (C) 2011-2019 by Sylvain Munaut <tnt@246tNt.com>
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* All Rights Reserved
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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 Affero 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 Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero 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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/*! \addtogroup conv
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* @{
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*/
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/*! \file l1/conv.c
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* \brief Osmocom GMR-1 convolutional coding implementation
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*/
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#include <stdint.h>
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#include <osmocom/core/conv.h>
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/* All codes are K=5 and share the same next_state table */
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static const uint8_t gmr1_conv_next_state[][2] = {
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{ 0, 1 }, { 2, 3 }, { 4, 5 }, { 6, 7 },
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{ 8, 9 }, { 10, 11 }, { 12, 13 }, { 14, 15 },
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{ 0, 1 }, { 2, 3 }, { 4, 5 }, { 6, 7 },
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{ 8, 9 }, { 10, 11 }, { 12, 13 }, { 14, 15 },
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};
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/*
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* GMR-1 Rate 1/2 convolutional code
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*
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* g0(D) = 1 + D^3 + D^4
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* g1(D) = 1 + D + D^2 + D^4
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*/
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static const uint8_t gmr1_conv_12_next_output[][2] = {
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{ 0, 3 }, { 1, 2 }, { 1, 2 }, { 0, 3 },
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{ 2, 1 }, { 3, 0 }, { 3, 0 }, { 2, 1 },
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{ 3, 0 }, { 2, 1 }, { 2, 1 }, { 3, 0 },
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{ 1, 2 }, { 0, 3 }, { 0, 3 }, { 1, 2 },
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};
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/*! \brief GMR-1 rate 1/2 convolutional code */
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const struct osmo_conv_code gmr1_conv_12 = {
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.N = 2,
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.K = 5,
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.len = 0, /* to be filled during specialization */
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.next_output = gmr1_conv_12_next_output,
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.next_state = gmr1_conv_next_state,
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};
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/*
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* GMR-1 Rate 1/3 convolutional code
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*
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* g0(D) = 1 + D^2 + D^4
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* g1(D) = 1 + D + D^3 + D^4
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* g2(D) = 1 + D + D^2 + D^3 + D^4
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*/
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static const uint8_t gmr1_conv_13_next_output[][2] = {
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{ 0, 7 }, { 3, 4 }, { 5, 2 }, { 6, 1 },
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{ 3, 4 }, { 0, 7 }, { 6, 1 }, { 5, 2 },
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{ 7, 0 }, { 4, 3 }, { 2, 5 }, { 1, 6 },
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{ 4, 3 }, { 7, 0 }, { 1, 6 }, { 2, 5 },
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};
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/*! \brief GMR-1 rate 1/3 convolutional code */
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const struct osmo_conv_code gmr1_conv_13 = {
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.N = 3,
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.K = 5,
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.len = 0, /* to be filled during specialization */
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.next_output = gmr1_conv_13_next_output,
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.next_state = gmr1_conv_next_state,
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};
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/*
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* GMR-1 Rate 1/4 convolutional code
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*
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* g0(D) = 1 + D^3 + D^4
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* g1(D) = 1 + D + D^2 + D^4
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* g2(D) = 1 + D^2 + D^4
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* g3(D) = 1 + D + D^2 + D^3 + D^4
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*/
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static const uint8_t gmr1_conv_14_next_output[][2] = {
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{ 0, 15 }, { 5, 10 }, { 7, 8 }, { 2, 13 },
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{ 9, 6 }, { 12, 3 }, { 14, 1 }, { 11, 4 },
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{ 15, 0 }, { 10, 5 }, { 8, 7 }, { 13, 2 },
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{ 6, 9 }, { 3, 12 }, { 1, 14 }, { 4, 11 },
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};
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/*! \brief GMR-1 rate 1/4 convolutional code */
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const struct osmo_conv_code gmr1_conv_14 = {
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.N = 4,
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.K = 5,
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.len = 0, /* to be filled during specialization */
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.next_output = gmr1_conv_14_next_output,
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.next_state = gmr1_conv_next_state,
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};
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/*
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* GMR-1 Rate 1/5 convolutional code
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*
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* g0(D) = 1 + D^2 + D^4
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* g1(D) = 1 + D + D^3 + D^4
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* g2(D) = 1 + D + D^2 + D^3 + D^4
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* g3(D) = 1 + D^2 + D^3 + D^4
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* g4(D) = 1 + D + D^2 + D^4
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*/
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static const uint8_t gmr1_conv_15_next_output[][2] = {
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{ 0, 31 }, { 13, 18 }, { 23, 8 }, { 26, 5 },
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{ 14, 17 }, { 3, 28 }, { 25, 6 }, { 20, 11 },
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{ 31, 0 }, { 18, 13 }, { 8, 23 }, { 5, 26 },
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{ 17, 14 }, { 28, 3 }, { 6, 25 }, { 11, 20 },
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};
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/*! \brief GMR-1 rate 1/5 convolutional code */
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const struct osmo_conv_code gmr1_conv_15 = {
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.N = 5,
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.K = 5,
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.len = 0, /* to be filled during specialization */
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.next_output = gmr1_conv_15_next_output,
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.next_state = gmr1_conv_next_state,
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};
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/*
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* GMR-1 TCH3 Speech (Rate 1/2 with tail biting) convolutional code
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*
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* g0(D) = 1 + D^2 + D^3 + D^5 + D^6
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* g1(D) = 1 + D + D^2 + D^3 + D^6
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*/
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static const uint8_t gmr1_conv_tch3_next_output[][2] = {
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{ 0, 3 }, { 1, 2 }, { 3, 0 }, { 2, 1 },
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{ 3, 0 }, { 2, 1 }, { 0, 3 }, { 1, 2 },
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{ 0, 3 }, { 1, 2 }, { 3, 0 }, { 2, 1 },
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{ 3, 0 }, { 2, 1 }, { 0, 3 }, { 1, 2 },
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{ 2, 1 }, { 3, 0 }, { 1, 2 }, { 0, 3 },
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{ 1, 2 }, { 0, 3 }, { 2, 1 }, { 3, 0 },
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{ 2, 1 }, { 3, 0 }, { 1, 2 }, { 0, 3 },
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{ 1, 2 }, { 0, 3 }, { 2, 1 }, { 3, 0 },
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{ 3, 0 }, { 2, 1 }, { 0, 3 }, { 1, 2 },
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{ 0, 3 }, { 1, 2 }, { 3, 0 }, { 2, 1 },
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{ 3, 0 }, { 2, 1 }, { 0, 3 }, { 1, 2 },
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{ 0, 3 }, { 1, 2 }, { 3, 0 }, { 2, 1 },
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{ 1, 2 }, { 0, 3 }, { 2, 1 }, { 3, 0 },
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{ 2, 1 }, { 3, 0 }, { 1, 2 }, { 0, 3 },
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{ 1, 2 }, { 0, 3 }, { 2, 1 }, { 3, 0 },
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{ 2, 1 }, { 3, 0 }, { 1, 2 }, { 0, 3 },
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};
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static const uint8_t gmr1_conv_tch3_next_state[][2] = {
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{ 0, 1 }, { 2, 3 }, { 4, 5 }, { 6, 7 },
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{ 8, 9 }, { 10, 11 }, { 12, 13 }, { 14, 15 },
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{ 16, 17 }, { 18, 19 }, { 20, 21 }, { 22, 23 },
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{ 24, 25 }, { 26, 27 }, { 28, 29 }, { 30, 31 },
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{ 32, 33 }, { 34, 35 }, { 36, 37 }, { 38, 39 },
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{ 40, 41 }, { 42, 43 }, { 44, 45 }, { 46, 47 },
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{ 48, 49 }, { 50, 51 }, { 52, 53 }, { 54, 55 },
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{ 56, 57 }, { 58, 59 }, { 60, 61 }, { 62, 63 },
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{ 0, 1 }, { 2, 3 }, { 4, 5 }, { 6, 7 },
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{ 8, 9 }, { 10, 11 }, { 12, 13 }, { 14, 15 },
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{ 16, 17 }, { 18, 19 }, { 20, 21 }, { 22, 23 },
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{ 24, 25 }, { 26, 27 }, { 28, 29 }, { 30, 31 },
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{ 32, 33 }, { 34, 35 }, { 36, 37 }, { 38, 39 },
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{ 40, 41 }, { 42, 43 }, { 44, 45 }, { 46, 47 },
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{ 48, 49 }, { 50, 51 }, { 52, 53 }, { 54, 55 },
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{ 56, 57 }, { 58, 59 }, { 60, 61 }, { 62, 63 },
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};
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/*! \brief GMR-1 TCH3 speech tail-biting convolutional code */
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const struct osmo_conv_code gmr1_conv_tch3 = {
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.N = 2,
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.K = 7,
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.term = CONV_TERM_TAIL_BITING,
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.next_output = gmr1_conv_tch3_next_output,
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.next_state = gmr1_conv_tch3_next_state,
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};
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/*! @} */
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