mirror of
https://github.com/saitohirga/WSJT-X.git
synced 2024-11-14 16:11:50 -05:00
80 lines
3.1 KiB
C
80 lines
3.1 KiB
C
// qracodes.h
|
|
// Q-ary RA codes encoding/decoding functions
|
|
//
|
|
// (c) 2016 - Nico Palermo, IV3NWV - Microtelecom Srl, Italy
|
|
// ------------------------------------------------------------------------------
|
|
// This file is part of the qracodes project, a Forward Error Control
|
|
// encoding/decoding package based on Q-ary RA (Repeat and Accumulate) LDPC codes.
|
|
//
|
|
// qracodes is free software: you can redistribute it and/or modify
|
|
// it under the terms of the GNU General Public License as published by
|
|
// the Free Software Foundation, either version 3 of the License, or
|
|
// (at your option) any later version.
|
|
// qracodes 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 General Public License for more details.
|
|
|
|
// You should have received a copy of the GNU General Public License
|
|
// along with qracodes source distribution.
|
|
// If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
#ifndef _qracodes_h_
|
|
#define _qracodes_h_
|
|
|
|
// type of codes
|
|
#define QRATYPE_NORMAL 0x00 // normal code
|
|
#define QRATYPE_CRC 0x01 // code with crc - last information symbol is a CRC
|
|
#define QRATYPE_CRCPUNCTURED 0x02 // the CRC symbol is punctured (not sent along the channel)
|
|
|
|
|
|
typedef struct {
|
|
// code parameters
|
|
const int K; // number of information symbols
|
|
const int N; // codeword length in symbols
|
|
const int m; // bits/symbol
|
|
const int M; // Symbol alphabet cardinality (2^m)
|
|
const int a; // code grouping factor
|
|
const int NC; // number of check symbols (N-K)
|
|
const int V; // number of variables in the code graph (N)
|
|
const int C; // number of factors in the code graph (N +(N-K)+1)
|
|
const int NMSG; // number of msgs in the code graph
|
|
const int MAXVDEG; // maximum variable degree
|
|
const int MAXCDEG; // maximum factor degree
|
|
const int type; // see QRATYPE_xx defines
|
|
const float R; // code rate (K/N)
|
|
const char name[64]; // code name
|
|
// tables used by the encoder
|
|
const int *acc_input_idx;
|
|
const int *acc_input_wlog;
|
|
const int *gflog;
|
|
const int *gfexp;
|
|
// tables used by the decoder -------------------------
|
|
const int *msgw;
|
|
const int *vdeg;
|
|
const int *cdeg;
|
|
const int *v2cmidx;
|
|
const int *c2vmidx;
|
|
const int *gfpmat;
|
|
} qracode;
|
|
// Uncomment the header file of the code which needs to be tested
|
|
|
|
//#include "qra12_63_64_irr_b.h" // irregular code (12,63) over GF(64)
|
|
//#include "qra13_64_64_irr_e.h" // irregular code with good performance and best UER protection at AP56
|
|
//#include "qra13_64_64_reg_a.h" // regular code with good UER but perf. inferior to that of code qra12_63_64_irr_b
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
int qra_encode(const qracode *pcode, int *y, const int *x);
|
|
float qra_mfskbesselmetric(float *pix, const float *rsq, const int m, const int N, float EsNoMetric);
|
|
int qra_extrinsic(const qracode *pcode, float *pex, const float *pix, int maxiter,float *qra_v2cmsg,float *qra_c2vmsg);
|
|
void qra_mapdecode(const qracode *pcode, int *xdec, float *pex, const float *pix);
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif // _qracodes_h_
|