mirror of https://github.com/saitohirga/WSJT-X.git
81 lines
3.2 KiB
C
81 lines
3.2 KiB
C
// qracodes.h
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// Q-ary RA codes encoding/decoding functions
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//
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// (c) 2016 - Nico Palermo, IV3NWV - Microtelecom Srl, Italy
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// ------------------------------------------------------------------------------
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// This file is part of the qracodes project, a Forward Error Control
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// encoding/decoding package based on Q-ary RA (Repeat and Accumulate) LDPC codes.
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//
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// qracodes is free software: you can redistribute it and/or modify
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// it under the terms of the GNU 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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// qracodes 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 General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with qracodes source distribution.
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// If not, see <http://www.gnu.org/licenses/>.
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#ifndef _qracodes_h_
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#define _qracodes_h_
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// type of codes
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#define QRATYPE_NORMAL 0x00 // normal code
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#define QRATYPE_CRC 0x01 // code with crc - last information symbol is a CRC-6
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#define QRATYPE_CRCPUNCTURED 0x02 // the CRC-6 symbol is punctured (not sent along the channel)
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#define QRATYPE_CRCPUNCTURED2 0x03 // code with CRC-12. The two crc symbols are punctured
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typedef struct {
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// code parameters
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const int K; // number of information symbols
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const int N; // codeword length in symbols
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const int m; // bits/symbol
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const int M; // Symbol alphabet cardinality (2^m)
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const int a; // code grouping factor
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const int NC; // number of check symbols (N-K)
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const int V; // number of variables in the code graph (N)
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const int C; // number of factors in the code graph (N +(N-K)+1)
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const int NMSG; // number of msgs in the code graph
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const int MAXVDEG; // maximum variable degree
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const int MAXCDEG; // maximum factor degree
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const int type; // see QRATYPE_xx defines
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const float R; // code rate (K/N)
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const char name[64]; // code name
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// tables used by the encoder
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const int *acc_input_idx;
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const int *acc_input_wlog;
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const int *gflog;
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const int *gfexp;
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// tables used by the decoder -------------------------
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const int *msgw;
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const int *vdeg;
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const int *cdeg;
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const int *v2cmidx;
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const int *c2vmidx;
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const int *gfpmat;
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} qracode;
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// Uncomment the header file of the code which needs to be tested
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//#include "qra12_63_64_irr_b.h" // irregular code (12,63) over GF(64)
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//#include "qra13_64_64_irr_e.h" // irregular code with good performance and best UER protection at AP56
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//#include "qra13_64_64_reg_a.h" // regular code with good UER but perf. inferior to that of code qra12_63_64_irr_b
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#ifdef __cplusplus
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extern "C" {
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#endif
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int qra_encode(const qracode *pcode, int *y, const int *x);
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float qra_mfskbesselmetric(float *pix, const float *rsq, const int m, const int N, float EsNoMetric);
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int qra_extrinsic(const qracode *pcode, float *pex, const float *pix, int maxiter,float *qra_v2cmsg,float *qra_c2vmsg);
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void qra_mapdecode(const qracode *pcode, int *xdec, float *pex, const float *pix);
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#ifdef __cplusplus
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}
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#endif
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#endif // _qracodes_h_
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