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/*
FILE...: ldpc_codes.c
AUTHOR.: David Rowe
CREATED: July 2020
Array of LDPC codes used for various Codec2 waveforms.
*/
#include <stdio.h>
#include <string.h>
#include "assert.h"
#include "ldpc_codes.h"
#include "interldpc.h"
#include "H_2064_516_sparse.h"
#include "HRA_112_112.h"
#include "HRAb_396_504.h"
#include "H_256_768_22.h"
#include "H_256_512_4.h"
#include "HRAa_1536_512.h"
#include "H_128_256_5.h"
#include "HRA_56_56.h"
#include "H_4096_8192_3d.h"
#include "H_16200_9720.h"
#include "H_1024_2048_4f.h"
#include "H_212_158.h"
struct LDPC ldpc_codes[] = {
/* short rate 1/2 code for FreeDV 700D */
{
"HRA_112_112",
HRA_112_112_MAX_ITER,
0,
1,
1,
HRA_112_112_CODELENGTH,
HRA_112_112_NUMBERPARITYBITS,
HRA_112_112_NUMBERROWSHCOLS,
HRA_112_112_MAX_ROW_WEIGHT,
HRA_112_112_MAX_COL_WEIGHT,
(uint16_t *)HRA_112_112_H_rows,
(uint16_t *)HRA_112_112_H_cols
}
,
/* short rate 1/2 code for FreeDV 700E */
{
"HRA_56_56",
HRA_56_56_MAX_ITER,
0,
1,
1,
HRA_56_56_CODELENGTH,
HRA_56_56_NUMBERPARITYBITS,
HRA_56_56_NUMBERROWSHCOLS,
HRA_56_56_MAX_ROW_WEIGHT,
HRA_56_56_MAX_COL_WEIGHT,
(uint16_t *)HRA_56_56_H_rows,
(uint16_t *)HRA_56_56_H_cols
},
#ifndef __EMBEDDED__
/* default Wenet High Alitiude Balloon rate 0.8 code */
{
"H_2064_516_sparse",
MAX_ITER,
0,
1,
1,
CODELENGTH,
NUMBERPARITYBITS,
NUMBERROWSHCOLS,
MAX_ROW_WEIGHT,
MAX_COL_WEIGHT,
(uint16_t *)H_2064_516_sparse_H_rows,
(uint16_t *)H_2064_516_sparse_H_cols
},
/* rate 0.8 code used for FreeDV 2020 */
{
"HRAb_396_504",
HRAb_396_504_MAX_ITER,
0,
1,
1,
HRAb_396_504_CODELENGTH,
HRAb_396_504_NUMBERPARITYBITS,
HRAb_396_504_NUMBERROWSHCOLS,
HRAb_396_504_MAX_ROW_WEIGHT,
HRAb_396_504_MAX_COL_WEIGHT,
(uint16_t *)HRAb_396_504_H_rows,
(uint16_t *)HRAb_396_504_H_cols
},
/* Rate 0.745 code for mopping up errors on 2020C from Bill VK5DSP */
{
"H_212_158",
H_212_158_MAX_ITER,
0,
1,
1,
H_212_158_CODELENGTH,
H_212_158_NUMBERPARITYBITS,
H_212_158_NUMBERROWSHCOLS,
H_212_158_MAX_ROW_WEIGHT,
H_212_158_MAX_COL_WEIGHT,
(uint16_t *)H_212_158_H_rows,
(uint16_t *)H_212_158_H_cols
},
/* rate 1/3 code, works at raw BER of 14% */
{
"H_256_768_22",
H_256_768_22_MAX_ITER,
0,
1,
1,
H_256_768_22_CODELENGTH,
H_256_768_22_NUMBERPARITYBITS,
H_256_768_22_NUMBERROWSHCOLS,
H_256_768_22_MAX_ROW_WEIGHT,
H_256_768_22_MAX_COL_WEIGHT,
(uint16_t *)H_256_768_22_H_rows,
(uint16_t *)H_256_768_22_H_cols
},
/* used for 4FSK/LLR experiments */
{
"H_256_512_4",
H_256_512_4_MAX_ITER,
0,
1,
1,
H_256_512_4_CODELENGTH,
H_256_512_4_NUMBERPARITYBITS,
H_256_512_4_NUMBERROWSHCOLS,
H_256_512_4_MAX_ROW_WEIGHT,
H_256_512_4_MAX_COL_WEIGHT,
(uint16_t *)H_256_512_4_H_rows,
(uint16_t *)H_256_512_4_H_cols
},
/* used for 4FSK/LLR experiments */
{
"HRAa_1536_512",
HRAa_1536_512_MAX_ITER,
0,
1,
1,
HRAa_1536_512_CODELENGTH,
HRAa_1536_512_NUMBERPARITYBITS,
HRAa_1536_512_NUMBERROWSHCOLS,
HRAa_1536_512_MAX_ROW_WEIGHT,
HRAa_1536_512_MAX_COL_WEIGHT,
(uint16_t *)HRAa_1536_512_H_rows,
(uint16_t *)HRAa_1536_512_H_cols
},
/* used for 4FSK/LLR experiments */
{
"H_128_256_5",
H_128_256_5_MAX_ITER,
0,
1,
1,
H_128_256_5_CODELENGTH,
H_128_256_5_NUMBERPARITYBITS,
H_128_256_5_NUMBERROWSHCOLS,
H_128_256_5_MAX_ROW_WEIGHT,
H_128_256_5_MAX_COL_WEIGHT,
(uint16_t *)H_128_256_5_H_rows,
(uint16_t *)H_128_256_5_H_cols
},
/* Nice long code from Bill VK5DSP - useful for HF data */
{
"H_4096_8192_3d",
H_4096_8192_3d_MAX_ITER,
0,
1,
1,
H_4096_8192_3d_CODELENGTH,
H_4096_8192_3d_NUMBERPARITYBITS,
H_4096_8192_3d_NUMBERROWSHCOLS,
H_4096_8192_3d_MAX_ROW_WEIGHT,
H_4096_8192_3d_MAX_COL_WEIGHT,
(uint16_t *)H_4096_8192_3d_H_rows,
(uint16_t *)H_4096_8192_3d_H_cols
},
/* Nice long code from Bill VK5DSP - useful for HF data */
{
"H_16200_9720",
H_16200_9720_MAX_ITER,
0,
1,
1,
H_16200_9720_CODELENGTH,
H_16200_9720_NUMBERPARITYBITS,
H_16200_9720_NUMBERROWSHCOLS,
H_16200_9720_MAX_ROW_WEIGHT,
H_16200_9720_MAX_COL_WEIGHT,
(uint16_t *)H_16200_9720_H_rows,
(uint16_t *)H_16200_9720_H_cols
},
/* Another fine code from Bill VK5DSP - also useful for HF data */
{
"H_1024_2048_4f",
H_1024_2048_4f_MAX_ITER,
0,
1,
1,
H_1024_2048_4f_CODELENGTH,
H_1024_2048_4f_NUMBERPARITYBITS,
H_1024_2048_4f_NUMBERROWSHCOLS,
H_1024_2048_4f_MAX_ROW_WEIGHT,
H_1024_2048_4f_MAX_COL_WEIGHT,
(uint16_t *)H_1024_2048_4f_H_rows,
(uint16_t *)H_1024_2048_4f_H_cols
}
#endif
};
int ldpc_codes_num(void) { return sizeof(ldpc_codes)/sizeof(struct LDPC); }
void ldpc_codes_list() {
fprintf(stderr, "\n");
for(int c=0; c<ldpc_codes_num(); c++) {
int n = ldpc_codes[c].NumberRowsHcols + ldpc_codes[c].NumberParityBits;
int k = ldpc_codes[c].NumberRowsHcols;
float rate = (float)k/n;
fprintf(stderr, "%-20s rate %3.2f (%d,%d) \n", ldpc_codes[c].name, (double)rate, n, k);
}
fprintf(stderr, "\n");
}
int ldpc_codes_find(char name[]) {
int code_index = -1;
for(int c=0; c<ldpc_codes_num(); c++)
if (strcmp(ldpc_codes[c].name, name) == 0)
code_index = c;
assert(code_index != -1); /* code not found */
return code_index;
}
void ldpc_codes_setup(struct LDPC *ldpc, char name[]) {
int code_index;
code_index = ldpc_codes_find(name);
assert(code_index != -1);
memcpy(ldpc,&ldpc_codes[code_index], sizeof(struct LDPC));
set_up_ldpc_constants(ldpc, ldpc->CodeLength, ldpc->NumberParityBits);
}
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