mirror of
https://github.com/saitohirga/WSJT-X.git
synced 2025-10-30 20:40:28 -04:00
124 lines
4.5 KiB
C
124 lines
4.5 KiB
C
// q65.h
|
|
// Q65 modes encoding/decoding functions
|
|
//
|
|
// (c) 2020 - 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 _q65_h
|
|
#define _q65_h
|
|
|
|
#include "qracodes.h"
|
|
|
|
// Error codes returned by q65_decode(...)
|
|
#define Q65_DECODE_INVPARAMS -1
|
|
#define Q65_DECODE_FAILED -2
|
|
#define Q65_DECODE_CRCMISMATCH -3
|
|
#define Q65_DECODE_LLHLOW -4
|
|
#define Q65_DECODE_UNDETERR -5
|
|
|
|
// Verify loglikelihood after successful decoding
|
|
#define Q65_CHECKLLH
|
|
// Max codeword list size in q65_decode_fullaplist
|
|
#define Q65_FULLAPLIST_SIZE 256
|
|
|
|
// maximum number of weights for the fast-fading metric evaluation
|
|
#define Q65_FASTFADING_MAXWEIGTHS 65
|
|
|
|
extern float q65_llh;
|
|
|
|
typedef struct {
|
|
const qracode *pQraCode; // qra code to be used by the codec
|
|
float decoderEsNoMetric; // value for which we optimize the decoder metric
|
|
int *x; // codec input
|
|
int *y; // codec output
|
|
float *qra_v2cmsg; // decoder v->c messages
|
|
float *qra_c2vmsg; // decoder c->v messages
|
|
float *ix; // decoder intrinsic information
|
|
float *ex; // decoder extrinsic information
|
|
// variables used to compute the intrinsics in the fast-fading case
|
|
int nBinsPerTone;
|
|
int nBinsPerSymbol;
|
|
float ffNoiseVar;
|
|
float ffEsNoMetric;
|
|
int nWeights;
|
|
float ffWeight[Q65_FASTFADING_MAXWEIGTHS];
|
|
} q65_codec_ds;
|
|
|
|
int q65_init(q65_codec_ds *pCodec, const qracode *pQraCode);
|
|
void q65_free(q65_codec_ds *pCodec);
|
|
|
|
int q65_encode(const q65_codec_ds *pCodec, int *pOutputCodeword, const int *pInputMsg);
|
|
|
|
int q65_intrinsics(q65_codec_ds *pCodec, float *pIntrinsics, const float *pInputEnergies);
|
|
|
|
int q65_intrinsics_fastfading(q65_codec_ds *pCodec,
|
|
float *pIntrinsics, // intrinsic symbol probabilities output
|
|
const float *pInputEnergies, // received energies input
|
|
const int submode, // submode idx (0=A ... 4=E)
|
|
const float B90Ts, // normalized spread bandwidth (90% fractional energy)
|
|
const int fadingModel); // 0=Gaussian 1=Lorentzian fade model
|
|
|
|
|
|
int q65_decode(q65_codec_ds *pCodec,
|
|
int* pDecodedCodeword,
|
|
int *pDecodedMsg,
|
|
const float *pIntrinsics,
|
|
const int *pAPMask,
|
|
const int *pAPSymbols,
|
|
const int maxiters);
|
|
|
|
int q65_decode_fullaplist(q65_codec_ds *codec,
|
|
int *ydec,
|
|
int *xdec,
|
|
const float *pIntrinsics,
|
|
const int *pCodewords,
|
|
const int nCodewords);
|
|
|
|
int q65_esnodb(const q65_codec_ds *pCodec,
|
|
float *pEsNodB,
|
|
const int *ydec,
|
|
const float *pInputEnergies);
|
|
|
|
int q65_esnodb_fastfading(
|
|
const q65_codec_ds *pCodec,
|
|
float *pEsNodB,
|
|
const int *ydec,
|
|
const float *pInputEnergies);
|
|
|
|
|
|
// helper functions
|
|
#define q65_get_message_length(pCodec) _q65_get_message_length((pCodec)->pQraCode)
|
|
#define q65_get_codeword_length(pCodec) _q65_get_codeword_length((pCodec)->pQraCode)
|
|
#define q65_get_code_rate(pCodec) _q65_get_code_rate((pCodec)->pQraCode)
|
|
#define q65_get_alphabet_size(pCodec) _q65_get_alphabet_size((pCodec)->pQraCode)
|
|
#define q65_get_bits_per_symbol(pCodec) _q65_get_bits_per_symbol((pCodec)->pQraCode)
|
|
|
|
|
|
// internally used but made public for the above defines
|
|
int _q65_get_message_length(const qracode *pCode);
|
|
int _q65_get_codeword_length(const qracode *pCode);
|
|
float _q65_get_code_rate(const qracode *pCode);
|
|
static void _q65_mask(const qracode *pcode, float *ix, const int *mask, const int *x);
|
|
int _q65_get_alphabet_size(const qracode *pCode);
|
|
int _q65_get_bits_per_symbol(const qracode *pCode);
|
|
|
|
// internally used but made public for threshold optimization
|
|
int q65_check_llh(float *llh, const int* ydec, const int nN, const int nM, const float *pIntrin);
|
|
|
|
#endif // _qra65_h
|