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/* GMR-1 puncturing */
/* See GMR-1 05.003 (ETSI TS 101 376-5-3 V1.2.1) - Section 4.5 */
/* (C) 2011-2016 by Sylvain Munaut <tnt@246tNt.com>
* All Rights Reserved
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Affero 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/*! \addtogroup punct
* @{
*/
/*! \file l1/punct.c
* \brief Osmocom GMR-1 puncturing implementation
*/
#include <osmocom/core/conv.h>
#include <osmocom/gmr1/l1/punct.h>
#include <errno.h>
#include <stdlib.h>
/*! \brief Generate convolutional code puncturing array for a osmo_conv_code
* \param[inout] code The code for which to generate the puncturing array
* \param[in] punct_pre The puncturing scheme for first block (can be NULL)
* \param[in] punct_main The puncturing scheme
* \param[in] punct_post The puncturing scheme for last block (can be NULL)
* \param[in] repeat How many time to apply main punctured (0 = auto)
* \return 0 for success, <0 for error codes.
*
* The array is allocated with malloc and must be free'd by the caller
* when no longer required.
*/
int
gmr1_puncturer_generate(struct osmo_conv_code *code,
const struct gmr1_puncturer *punct_pre,
const struct gmr1_puncturer *punct_main,
const struct gmr1_puncturer *punct_post,
int repeat)
{
int N, d, cl, pl;
int ip, ii, io, i;
int *p;
/* Safety checks */
N = code->N;
if (punct_pre && (punct_pre->N != N))
return -EINVAL;
if (punct_main->N != N)
return -EINVAL;
if (punct_post && (punct_post->N != N))
return -EINVAL;
/* Upper bound for length */
cl = osmo_conv_get_output_length(code, 0);
pl = 0;
if (punct_pre) {
cl -= punct_pre->L * N;
pl += punct_pre->r;
}
if (punct_post) {
cl -= punct_post->L * N;
pl += punct_post->r;
}
d = punct_main->L * N;
if (!repeat)
repeat = ((cl + d - 1) / d);
pl += repeat * punct_main->r + 1;
/* Alloc array */
p = malloc(pl * sizeof(int));
if (!p)
return -ENOMEM;
/* Fill */
cl = osmo_conv_get_output_length(code, 0);
ii = io = 0;
if (punct_pre) {
d = punct_pre->L * N;
for (ip=0; ii<cl && ip<d ; ii++,ip++)
if (punct_pre->mask[ip] == 0)
p[io++] = ii;
}
if (punct_post) {
cl -= punct_post->L * N;
}
for (i=0; i<repeat; i++) {
d = punct_main->L * N;
for (ip=0; ii<cl && ip<d; ii++,ip++) {
if (punct_main->mask[ip] == 0)
p[io++] = ii;
}
}
if (punct_post) {
d = punct_post->L * N;
ii = cl;
for (ip=0; ii>0 && ip<d; ii++,ip++)
if (punct_post->mask[ip] == 0)
p[io++] = ii;
}
p[io] = -1;
code->puncture = p;
return 0;
}
/*! \brief GMR-1 P(1;2) puncturing code for the rate 1/2 conv coder */
const struct gmr1_puncturer gmr1_punct12_P12 = {
.r = 1,
.L = 2,
.N = 2,
.mask = {
1, 1,
1, 0,
},
};
/*! \brief GMR-1 P(2;3) puncturing code for the rate 1/2 conv coder */
const struct gmr1_puncturer gmr1_punct12_P23 = {
.r = 2,
.L = 3,
.N = 2,
.mask = {
0, 1,
1, 0,
1, 1,
},
};
/*! \brief GMR-1 P(2;5) puncturing code for the rate 1/2 conv coder */
const struct gmr1_puncturer gmr1_punct12_P25 = {
.r = 2,
.L = 5,
.N = 2,
.mask = {
1, 0,
1, 1,
1, 0,
1, 1,
1, 1,
},
};
/*! \brief GMR-1 P*(2;5) puncturing code for the rate 1/2 conv coder */
const struct gmr1_puncturer gmr1_punct12_Ps25 = {
.r = 2,
.L = 5,
.N = 2,
.mask = {
1, 1,
1, 1,
1, 0,
1, 1,
1, 0,
},
};
/*! \brief GMR-1 P(3;11) puncturing code for the rate 1/2 conv coder */
const struct gmr1_puncturer gmr1_punct12_P311 = {
.r = 3,
.L = 11,
.N = 2,
.mask = {
1, 0,
1, 1,
1, 0,
1, 1,
1, 1,
1, 0,
1, 1,
1, 1,
1, 1,
1, 1,
1, 1,
},
};
/*! \brief GMR-1 P(4;12) puncturing code for the rate 1/2 conv coder */
const struct gmr1_puncturer gmr1_punct12_P412 = {
.r = 4,
.L = 12,
.N = 2,
.mask = {
1, 0,
1, 1,
1, 0,
1, 1,
1, 0,
1, 1,
1, 0,
1, 1,
1, 1,
1, 1,
1, 1,
1, 1,
},
};
/*! \brief GMR-1 P*(4;12) puncturing code for the rate 1/2 conv coder */
const struct gmr1_puncturer gmr1_punct12_Ps412 = {
.r = 4,
.L = 12,
.N = 2,
.mask = {
1, 1,
1, 1,
1, 1,
1, 1,
1, 1,
1, 0,
1, 1,
1, 0,
1, 1,
1, 0,
1, 1,
1, 0,
},
};
/*! \brief GMR-1 P(2;5) puncturing code for the rate 1/3 conv coder */
const struct gmr1_puncturer gmr1_punct13_P25 = {
.r = 2,
.L = 5,
.N = 3,
.mask = {
1, 1, 1,
1, 1, 1,
1, 0, 1,
1, 1, 1,
1, 0, 1,
},
};
/*! \brief GMR-1 P(1;5) puncturing code for the rate 1/3 conv coder */
const struct gmr1_puncturer gmr1_punct13_P15 = {
.r = 1,
.L = 5,
.N = 3,
.mask = {
1, 0, 1,
1, 1, 1,
1, 1, 1,
1, 1, 1,
1, 1, 1,
},
};
/*! \brief GMR-1 P*(1;5) puncturing code for the rate 1/3 conv coder */
const struct gmr1_puncturer gmr1_punct13_Ps15 = {
.r = 1,
.L = 5,
.N = 3,
.mask = {
1, 1, 1,
1, 1, 1,
1, 1, 1,
1, 1, 1,
1, 0, 1,
},
};
/*! \brief GMR-1 P(1;6) puncturing code for the rate 1/3 conv coder */
const struct gmr1_puncturer gmr1_punct13_P16 = {
.r = 1,
.L = 6,
.N = 3,
.mask = {
1, 1, 0,
1, 1, 1,
1, 1, 1,
1, 1, 1,
1, 1, 1,
1, 1, 1,
},
};
/*! \brief GMR-1 P(2;3) puncturing code for the rate 1/5 conv coder */
const struct gmr1_puncturer gmr1_punct15_P23 = {
.r = 2,
.L = 3,
.N = 5,
.mask = {
1, 1, 1, 1, 1,
1, 1, 0, 1, 1,
1, 1, 1, 1, 0,
},
};
/*! \brief GMR-1 P(5;3) puncturing code for the rate 1/5 conv coder */
const struct gmr1_puncturer gmr1_punct15_P53 = {
.r = 5,
.L = 3,
.N = 5,
.mask = {
1, 1, 1, 0, 1,
1, 0, 0, 1, 1,
1, 1, 1, 0, 0,
},
};
/*! \brief GMR-1 P*(5;3) puncturing code for the rate 1/5 conv coder */
const struct gmr1_puncturer gmr1_punct15_Ps53 = {
.r = 5,
.L = 3,
.N = 5,
.mask = {
1, 1, 1, 0, 0,
1, 0, 0, 1, 1,
1, 1, 1, 0, 1,
},
};
/*! @} */
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