Commit d5e94b2c authored by knopp's avatar knopp

decoder_list_t structure for in-place computations

parent d4d2f866
......@@ -29,14 +29,16 @@
#include "PHY/CODING/nrPolar_tools/nr_polar_pbch_defs.h"
#include "PHY/TOOLS/time_meas.h"
int8_t polar_decoder(
double *input,
uint8_t *output,
t_nrPolar_params *polarParams,
uint8_t listSize,
double *aPrioriPayload,
uint8_t pathMetricAppr,
time_stats_t *init,
uint8_t pathMetricAppr,
time_stats_t *init,
time_stats_t *polar_rate_matching,
time_stats_t *decoding,
time_stats_t *bit_extraction,
......@@ -48,23 +50,24 @@ int8_t polar_decoder(
start_meas(init);
uint8_t ***bit = nr_alloc_uint8_t_3D_array(2*listSize, (polarParams->n+1), polarParams->N);
uint8_t **bitUpdated = nr_alloc_uint8_t_2D_array(polarParams->N, (polarParams->n+1)); //0=False, 1=True
uint8_t **llrUpdated = nr_alloc_uint8_t_2D_array(polarParams->N, (polarParams->n+1)); //0=False, 1=True
double ***llr = nr_alloc_double_3D_array(2*listSize,(polarParams->n+1), polarParams->N);
uint8_t **crcChecksum = nr_alloc_uint8_t_2D_array(polarParams->crcParityBits, 2*listSize);
double *pathMetric = malloc(sizeof(double)*(2*listSize));
uint8_t *crcState = malloc(sizeof(uint8_t)*(2*listSize)); //0=False, 1=True
for (int i=0; i<(2*listSize); i++) {
pathMetric[i] = 0;
crcState[i]=1;
for (int j=0; j< polarParams->n+1; j++) {
memset((void*)&bit[i][j][0],0,sizeof(uint8_t)*polarParams->N);
memset((void*)&llr[i][j][0],0,sizeof(double)*polarParams->N);
}
for (int j=0;j<polarParams->crcParityBits;j++) crcChecksum[j][i] = 0;
decoder_list_t dlist[2*listSize];
for ( int i=0;i<2*listSize;i++) {
dlist[i].bit = nr_alloc_uint8_t_2D_array((polarParams->n+1), polarParams->N);
dlist[i].llr = nr_alloc_double_2D_array((polarParams->n+1), polarParams->N);
dlist[i].crcChecksum = malloc(sizeof(uint8_t)*polarParams->crcParityBits);
for (int j=0; j< polarParams->n+1; j++) {
memset((void*)&dlist[i].bit[j][0],0,sizeof(uint8_t)*polarParams->N);
memset((void*)&dlist[i].llr[j][0],0,sizeof(double)*polarParams->N);
}
for (int j=0;j<polarParams->crcParityBits;j++) dlist[i].crcChecksum[j] = 0;
dlist[i].crcState = 1;
dlist[i].pathMetric = 0;
}
for (int i=0; i<polarParams->N; i++) {
memset((void *)&llrUpdated[i][0],0,sizeof(uint8_t)*polarParams->n);
memset((void *)&bitUpdated[i][0],0,sizeof(uint8_t)*polarParams->n);
......@@ -114,7 +117,7 @@ int8_t polar_decoder(
double *d_tilde = malloc(sizeof(double) * polarParams->N);
nr_polar_rate_matching(input, d_tilde, polarParams->rate_matching_pattern, polarParams->K, polarParams->N, polarParams->encoderLength);
memcpy((void*)&llr[0][polarParams->n][0],(void*)&d_tilde[0],sizeof(double)*polarParams->N);
memcpy((void*)&dlist[0].llr[polarParams->n][0],(void*)&d_tilde[0],sizeof(double)*polarParams->N);
stop_meas(polar_rate_matching);
/*
......@@ -125,69 +128,81 @@ int8_t polar_decoder(
uint8_t currentListSize=1;
uint8_t decoderIterationCheck=0;
int16_t checkCrcBits=-1;
uint8_t listIndex[2*listSize], copyIndex=0;
uint8_t copyIndex=0;
decoder_list_t *sorted_dlist[2*listSize];
int listIndex[2*listSize];
double pathMetric[2*listSize];
for (uint8_t i = 0; i < 2*listSize; i++) sorted_dlist[i] = &dlist[i];
// for (uint8_t i = 0; i < 2*listSize; i++) listIndex[i]=i;
for (uint16_t currentBit=0; currentBit<polarParams->N; currentBit++){
// printf("***************** BIT %d\n",currentBit);
start_meas(update_LLR);
updateLLR(llr, llrUpdated, bit, bitUpdated, currentListSize, currentBit, 0, polarParams->N, (polarParams->n+1), pathMetricAppr);
updateLLR(sorted_dlist, llrUpdated, bitUpdated, currentListSize, currentBit, 0, polarParams->N, (polarParams->n+1), pathMetricAppr);
stop_meas(update_LLR);
if (polarParams->information_bit_pattern[currentBit]==0) { //Frozen bit.
updatePathMetric(pathMetric, llr, currentListSize, 0, currentBit, pathMetricAppr); //approximation=0 --> 11b, approximation=1 --> 12
} else { //Information or CRC bit.
if ( (polarParams->interleaving_pattern[nonFrozenBit] < polarParams->payloadBits) && (aPrioriPayload[polarParams->interleaving_pattern[nonFrozenBit]] == 0) ) {
printf("app[%d] %f, payloadBits %d\n",polarParams->interleaving_pattern[nonFrozenBit],
polarParams->payloadBits,
aPrioriPayload[polarParams->interleaving_pattern[nonFrozenBit]]);
//Information bit with known value of "0".
updatePathMetric(pathMetric, llr, currentListSize, 0, currentBit, pathMetricAppr);
bitUpdated[currentBit][0]=1; //0=False, 1=True
} else if ( (polarParams->interleaving_pattern[nonFrozenBit] < polarParams->payloadBits) && (aPrioriPayload[polarParams->interleaving_pattern[nonFrozenBit]] == 1) ) {
//Information bit with known value of "1".
updatePathMetric(pathMetric, llr, currentListSize, 1, currentBit, pathMetricAppr);
for (uint8_t i=0; i<currentListSize; i++) bit[i][0][currentBit]=1;
bitUpdated[currentBit][0]=1;
updateCrcChecksum(crcChecksum, extended_crc_generator_matrix, currentListSize, nonFrozenBit, polarParams->crcParityBits);
} else {
start_meas(path_metric);
updatePathMetric2(pathMetric, llr, currentListSize, currentBit, pathMetricAppr);
stop_meas(path_metric);
start_meas(sorting);
for (int i = 0; i < currentListSize; i++) {
for (int k = 0; k < (polarParams->n+1); k++) {
/*
for (int j = 0; j < polarParams->N; j++) {
bit[i+currentListSize][k][j]=bit[i][k][j];
llr[i+currentListSize][k][j]=llr[i][k][j];
}*/
memcpy((void*)&bit[i+currentListSize][k][0],(void*)&bit[i][k][0],sizeof(uint8_t)*polarParams->N);
memcpy((void*)&llr[i+currentListSize][k][0],(void*)&llr[i][k][0],sizeof(double)*polarParams->N);
}
}
for (int i = 0; i < currentListSize; i++) {
bit[i][0][currentBit]=0;
crcState[i+currentListSize]=crcState[i];
}
for (int i = currentListSize; i < 2*currentListSize; i++) bit[i][0][currentBit]=1;
bitUpdated[currentBit][0]=1;
updateCrcChecksum2(crcChecksum, extended_crc_generator_matrix, currentListSize, nonFrozenBit, polarParams->crcParityBits);
currentListSize*=2;
//Keep only the best "listSize" number of entries.
if (currentListSize > listSize) {
for (uint8_t i = 0; i < 2*listSize; i++) listIndex[i]=i;
nr_sort_asc_double_1D_array_ind(pathMetric, listIndex, currentListSize);
//sort listIndex[listSize, ..., 2*listSize-1] in descending order.
uint8_t swaps, tempInd;
for (uint8_t i = 0; i < listSize; i++) {
swaps = 0;
for (uint8_t j = listSize; j < (2*listSize - i) - 1; j++) {
if (listIndex[j+1] > listIndex[j]) {
if (polarParams->information_bit_pattern[currentBit]==0) { //Frozen bit.
updatePathMetric(sorted_dlist,currentListSize, 0, currentBit, pathMetricAppr); //approximation=0 --> 11b, approximation=1 --> 12
} else { //Information or CRC bit.
if ( (polarParams->interleaving_pattern[nonFrozenBit] < polarParams->payloadBits) && (aPrioriPayload[polarParams->interleaving_pattern[nonFrozenBit]] == 0) ) {
printf("app[%d] %f, payloadBits %d\n",polarParams->interleaving_pattern[nonFrozenBit],
polarParams->payloadBits,
aPrioriPayload[polarParams->interleaving_pattern[nonFrozenBit]]);
//Information bit with known value of "0".
updatePathMetric(sorted_dlist, currentListSize, 0, currentBit, pathMetricAppr);
bitUpdated[currentBit][0]=1; //0=False, 1=True
} else if ( (polarParams->interleaving_pattern[nonFrozenBit] < polarParams->payloadBits) && (aPrioriPayload[polarParams->interleaving_pattern[nonFrozenBit]] == 1) ) {
//Information bit with known value of "1".
updatePathMetric(sorted_dlist, currentListSize, 1, currentBit, pathMetricAppr);
for (uint8_t i=0; i<currentListSize; i++) sorted_dlist[i]->bit[0][currentBit]=1;
bitUpdated[currentBit][0]=1;
updateCrcChecksum(sorted_dlist, extended_crc_generator_matrix, currentListSize, nonFrozenBit, polarParams->crcParityBits);
} else {
start_meas(path_metric);
updatePathMetric2(sorted_dlist, currentListSize, currentBit, pathMetricAppr);
stop_meas(path_metric);
start_meas(sorting);
for (int i = 0; i < currentListSize; i++) {
for (int k = 0; k < (polarParams->n+1); k++) {
/*
for (int j = 0; j < polarParams->N; j++) {
bit[i+currentListSize][k][j]=bit[i][k][j];
llr[i+currentListSize][k][j]=llr[i][k][j];
}*/
memcpy((void*)&sorted_dlist[i+currentListSize]->bit[k][0],(void*)&sorted_dlist[i]->bit[k][0],sizeof(uint8_t)*polarParams->N);
memcpy((void*)&sorted_dlist[i+currentListSize]->llr[k][0],(void*)&sorted_dlist[i]->llr[k][0],sizeof(double)*polarParams->N);
}
}
for (int i = 0; i < currentListSize; i++) {
sorted_dlist[i]->bit[0][currentBit]=0;
sorted_dlist[i+currentListSize]->crcState=sorted_dlist[i]->crcState;
}
for (int i = currentListSize; i < 2*currentListSize; i++) sorted_dlist[i]->bit[currentBit]=1;
bitUpdated[currentBit][0]=1;
updateCrcChecksum2(sorted_dlist,extended_crc_generator_matrix, currentListSize, nonFrozenBit, polarParams->crcParityBits);
currentListSize*=2;
//Keep only the best "listSize" number of entries.
if (currentListSize > listSize) {
for (int i = 0; i < 2*listSize; i++) {
listIndex[i]=i;
pathMetric[i] = dlist[i].pathMetric;
}
nr_sort_asc_double_1D_array_ind(pathMetric, listIndex, currentListSize);
for (int i = 0; i < 2*listSize; i++) sorted_dlist[i]=&dlist[listIndex[i]];
}
/*
//sort listIndex[listSize, ..., 2*listSize-1] in descending order.
uint8_t swaps, tempInd;
for (uint8_t i = 0; i < listSize; i++) {
swaps = 0;
for (uint8_t j = listSize; j < (2*listSize - i) - 1; j++) {
if (listIndex[j+1] > listIndex[j]) {
tempInd = listIndex[j];
listIndex[j] = listIndex[j + 1];
listIndex[j + 1] = tempInd;
......@@ -201,11 +216,11 @@ int8_t polar_decoder(
//First, backup the best "listSize" number of entries.
for (int k=(listSize-1); k>0; k--) {
for (int j=0; j<(polarParams->n+1); j++) {
/*
for (int i=0; i<polarParams->N; i++) {
bit[listIndex[(2*listSize-1)-k]][j][i]=bit[listIndex[k]][j][i];
llr[listIndex[(2*listSize-1)-k]][j][i]=llr[listIndex[k]][j][i];
}*/
//for (int i=0; i<polarParams->N; i++) {
// bit[listIndex[(2*listSize-1)-k]][j][i]=bit[listIndex[k]][j][i];
// llr[listIndex[(2*listSize-1)-k]][j][i]=llr[listIndex[k]][j][i];
// }
memcpy((void*)&bit[listIndex[(2*listSize-1)-k]][j][0],
(void*)&bit[listIndex[k]][j][0],
sizeof(uint8_t)*polarParams->N);
......@@ -231,10 +246,10 @@ int8_t polar_decoder(
if (copyIndex!=k) {
for (int j = 0; j < (polarParams->n + 1); j++) {
/* for (int i = 0; i < polarParams->N; i++) {
bit[k][j][i] = bit[copyIndex][j][i];
llr[k][j][i] = llr[copyIndex][j][i];
}*/
//for (int i = 0; i < polarParams->N; i++) {
// bit[k][j][i] = bit[copyIndex][j][i];
// llr[k][j][i] = llr[copyIndex][j][i];
// }
memcpy((void*)&bit[k][j][0],(void*)&bit[copyIndex][j][0],sizeof(uint8_t)*polarParams->N);
memcpy((void*)&llr[k][j][0],(void*)&llr[copyIndex][j][0],sizeof(double)*polarParams->N);
}
......@@ -259,7 +274,7 @@ int8_t polar_decoder(
crcState[k]=crcState[copyIndex];
}
currentListSize = listSize;
}
}*/
stop_meas(sorting);
}
......@@ -272,21 +287,21 @@ int8_t polar_decoder(
if ( checkCrcBits > (-1) ) {
for (uint8_t i = 0; i < currentListSize; i++) {
if (crcChecksum[checkCrcBits][i]==1) {
crcState[i]=0; //0=False, 1=True
if (dlist[i].crcChecksum[checkCrcBits]==1) {
dlist[i].crcState=0; //0=False, 1=True
}
}
}
for (uint8_t i = 0; i < currentListSize; i++) decoderIterationCheck+=crcState[i];
for (uint8_t i = 0; i < currentListSize; i++) decoderIterationCheck+=sorted_dlist[i]->crcState;
if (decoderIterationCheck==0) {
//perror("[SCL polar decoder] All list entries have failed the CRC checks.");
free(d_tilde);
free(pathMetric);
free(crcState);
nr_free_uint8_t_3D_array(bit, 2*listSize, (polarParams->n+1));
nr_free_double_3D_array(llr, 2*listSize, (polarParams->n+1));
nr_free_uint8_t_2D_array(crcChecksum, polarParams->crcParityBits);
for (int i=0;i<2*listSize;i++) {
nr_free_uint8_t_2D_array(dlist[i].bit, (polarParams->n+1));
nr_free_double_2D_array(dlist[i].llr, (polarParams->n+1));
free(dlist[i].crcChecksum);
}
stop_meas(decoding);
return(-1);
}
......@@ -301,30 +316,30 @@ int8_t polar_decoder(
nr_sort_asc_double_1D_array_ind(pathMetric, listIndex, currentListSize);
for (uint8_t i = 0; i < fmin(listSize, (pow(2,polarParams->crcCorrectionBits)) ); i++) {
if ( crcState[listIndex[i]] == 1 ) {
for (int j = 0; j < polarParams->N; j++) polarParams->nr_polar_u[j]=bit[listIndex[i]][0][j];
start_meas(bit_extraction);
//Extract the information bits (û to ĉ)
nr_polar_info_bit_extraction(polarParams->nr_polar_u, polarParams->nr_polar_cPrime, polarParams->information_bit_pattern, polarParams->N);
stop_meas(bit_extraction);
//Deinterleaving (ĉ to b)
start_meas(deinterleaving);
nr_polar_deinterleaver(polarParams->nr_polar_cPrime, polarParams->nr_polar_b, polarParams->interleaving_pattern, polarParams->K);
stop_meas(deinterleaving);
//Remove the CRC (â)
for (int j = 0; j < polarParams->payloadBits; j++) output[j]=polarParams->nr_polar_b[j];
break;
}
if ( dlist[i].crcState == 1 ) {
for (int j = 0; j < polarParams->N; j++) polarParams->nr_polar_u[j]=dlist[listIndex[i]].bit[0][j];
start_meas(bit_extraction);
//Extract the information bits (û to ĉ)
nr_polar_info_bit_extraction(polarParams->nr_polar_u, polarParams->nr_polar_cPrime, polarParams->information_bit_pattern, polarParams->N);
stop_meas(bit_extraction);
//Deinterleaving (ĉ to b)
start_meas(deinterleaving);
nr_polar_deinterleaver(polarParams->nr_polar_cPrime, polarParams->nr_polar_b, polarParams->interleaving_pattern, polarParams->K);
stop_meas(deinterleaving);
//Remove the CRC (â)
for (int j = 0; j < polarParams->payloadBits; j++) output[j]=polarParams->nr_polar_b[j];
break;
}
}
free(d_tilde);
free(pathMetric);
free(crcState);
nr_free_uint8_t_3D_array(bit, 2*listSize, (polarParams->n+1));
nr_free_double_3D_array(llr, 2*listSize, (polarParams->n+1));
nr_free_uint8_t_2D_array(crcChecksum, polarParams->crcParityBits);
for (int i=0;i<2*listSize;i++) {
nr_free_uint8_t_2D_array(dlist[i].bit, (polarParams->n+1));
nr_free_double_2D_array(dlist[i].llr, (polarParams->n+1));
free(dlist[i].crcChecksum);
}
nr_free_uint8_t_2D_array(extended_crc_generator_matrix, polarParams->K);
nr_free_uint8_t_2D_array(tempECGM, polarParams->K);
stop_meas(decoding);
......
......@@ -22,59 +22,85 @@
#include "PHY/CODING/nrPolar_tools/nr_polar_defs.h"
//#define SHOWCOMP 1
void updateLLR(double ***llr, uint8_t **llrU, uint8_t ***bit, uint8_t **bitU,
inline void computeLLR(double **llr, uint16_t row, uint16_t col,
uint16_t offset, uint8_t approximation) __attribute__((always_inline));
inline void computeLLR(double **llr, uint16_t row, uint16_t col,
uint16_t offset, uint8_t approximation) {
double a;
double b;
double absA,absB;
#ifdef SHOWCOMP
printf("computeLLR (%d,%d,%d,%d)\n",row,col,offset,i);
#endif
a = llr[col + 1][row];
b = llr[col+1][row + offset];
if (approximation) { //eq. (9)
absA = fabs(a);
absB = fabs(b);
llr[col][row] = copysign(1.0, a) * copysign(1.0, b) * fmin(absA, absB);
} else { //eq. (8a)
llr[col][row] = log((exp(a + b) + 1) / (exp(a) + exp(b)));
}
}
void updateLLR(decoder_list_t **dlist,uint8_t **llrU, uint8_t **bitU,
uint8_t listSize, uint16_t row, uint16_t col, uint16_t xlen, uint8_t ylen, uint8_t approximation) {
uint16_t offset = (xlen/(1<<(ylen-col-1)));
if (( (row) % (2*offset) ) >= offset ) {
if (bitU[row-offset][col]==0) updateBit(bit, bitU, listSize, (row-offset), col, xlen, ylen);
if (llrU[row-offset][col+1]==0) updateLLR(llr, llrU, bit, bitU, listSize, (row-offset), (col+1), xlen, ylen, approximation);
if (llrU[row][col+1]==0) updateLLR(llr, llrU, bit, bitU, listSize, row, (col+1), xlen, ylen, approximation);
if (bitU[row-offset][col]==0) updateBit(dlist, bitU, listSize, (row-offset), col, xlen, ylen);
if (llrU[row-offset][col+1]==0) updateLLR(dlist, llrU, bitU, listSize, (row-offset), (col+1), xlen, ylen, approximation);
if (llrU[row][col+1]==0) updateLLR(dlist, llrU, bitU, listSize, row, (col+1), xlen, ylen, approximation);
for (uint8_t i=0; i<listSize; i++) {
#ifdef SHOWCOMP
printf("updating LLR (%d,%d,%d) (bit %d,%d,%d, llr0 %d,%d,%d, llr1 %d,%d,%d \n",row,col,i,
row-offset,col,i,row-offset,col+1,i,row,col+1,i);
row-offset,col,i,row-offset,col+1,i,row,col+1,i);
#endif
llr[i][col][row] = (pow((-1),bit[i][col][row-offset])*llr[i][col+1][row-offset]) + llr[i][col+1][row];
dlist[i]->llr[col][row] = (pow((-1),dlist[i]->bit[col][row-offset])*dlist[i]->llr[col+1][row-offset]) + dlist[i]->llr[col+1][row];
}
} else {
if (llrU[row][col+1]==0) updateLLR(llr, llrU, bit, bitU, listSize, row, (col+1), xlen, ylen, approximation);
if (llrU[row+offset][col+1]==0) updateLLR(llr, llrU, bit, bitU, listSize, (row+offset), (col+1), xlen, ylen, approximation);
computeLLR(llr, row, col, listSize, offset, approximation);
if (llrU[row][col+1]==0) updateLLR(dlist, llrU, bitU, listSize, row, (col+1), xlen, ylen, approximation);
if (llrU[row+offset][col+1]==0) updateLLR(dlist, llrU, bitU, listSize, (row+offset), (col+1), xlen, ylen, approximation);
for (int i=0;i<listSize;i++) computeLLR(dlist[i]->llr, row, col, offset, approximation);
}
llrU[row][col]=1;
}
void updateBit(uint8_t ***bit, uint8_t **bitU, uint8_t listSize, uint16_t row,
uint16_t col, uint16_t xlen, uint8_t ylen) {
uint16_t offset = ( xlen/(pow(2,(ylen-col))) );
for (uint8_t i=0; i<listSize; i++) {
if (( (row) % (2*offset) ) >= offset ) {
if (bitU[row][col-1]==0) updateBit(bit, bitU, listSize, row, (col-1), xlen, ylen);
bit[i][col][row] = bit[i][col-1][row];
void updateBit(decoder_list_t **dlist, uint8_t **bitU, uint8_t listSize, uint16_t row,
uint16_t col, uint16_t xlen, uint8_t ylen) {
uint16_t offset = ( xlen/(pow(2,(ylen-col))) );
for (uint8_t i=0; i<listSize; i++) {
if (( (row) % (2*offset) ) >= offset ) {
if (bitU[row][col-1]==0) updateBit(dlist, bitU, listSize, row, (col-1), xlen, ylen);
dlist[i]->bit[col][row] = dlist[i]->bit[col-1][row];
#ifdef SHOWCOMP
printf("updating bit (%d,%d,%d) from (%d,%d,%d)\n",
row,col,i,row,col-1,i);
printf("updating bit (%d,%d,%d) from (%d,%d,%d)\n",
row,col,i,row,col-1,i);
#endif
} else {
if (bitU[row][col-1]==0) updateBit(bit, bitU, listSize, row, (col-1), xlen, ylen);
if (bitU[row+offset][col-1]==0) updateBit(bit, bitU, listSize, (row+offset), (col-1), xlen, ylen);
bit[i][col][row] = ( (bit[i][col-1][row]+bit[i][col-1][row+offset]) % 2);
} else {
if (bitU[row][col-1]==0) updateBit(dlist, bitU, listSize, row, (col-1), xlen, ylen);
if (bitU[row+offset][col-1]==0) updateBit(dlist, bitU, listSize, (row+offset), (col-1), xlen, ylen);
dlist[i]->bit[col][row] = ( (dlist[i]->bit[col-1][row]+dlist[i]->bit[col-1][row+offset]) % 2);
#ifdef SHOWCOMP
printf("updating bit (%d,%d,%d) from (%d,%d,%d)+(%d,%d,%d)\n",
row,col,i,row,col-1,i,row+offset,col-1,i);
printf("updating bit (%d,%d,%d) from (%d,%d,%d)+(%d,%d,%d)\n",
row,col,i,row,col-1,i,row+offset,col-1,i);
#endif
}
}
bitU[row][col]=1;
}
}
bitU[row][col]=1;
}
void updatePathMetric(double *pathMetric, double ***llr, uint8_t listSize, uint8_t bitValue,
void updatePathMetric(decoder_list_t **dlist,uint8_t listSize, uint8_t bitValue,
uint16_t row, uint8_t approximation) {
#ifdef SHOWCOMP
......@@ -84,11 +110,11 @@ void updatePathMetric(double *pathMetric, double ***llr, uint8_t listSize, uint8
if (approximation) { //eq. (12)
for (uint8_t i=0; i<listSize; i++) {
if ((2*bitValue) != ( 1 - copysign(1.0,llr[i][0][row]) )) pathMetric[i] += fabs(llr[i][0][row]);
if ((2*bitValue) != ( 1 - copysign(1.0,dlist[i]->llr[0][row]) )) dlist[i]->pathMetric += fabs(dlist[i]->llr[0][row]);
}
} else { //eq. (11b)
int8_t multiplier = (2*bitValue) - 1;
for (uint8_t i=0; i<listSize; i++) pathMetric[i] += log ( 1 + exp(multiplier*llr[i][0][row]) ) ;
for (uint8_t i=0; i<listSize; i++) dlist[i]->pathMetric += log ( 1 + exp(multiplier*dlist[i]->llr[0][row]) ) ;
}
}
......@@ -124,13 +150,13 @@ void updatePathMetric2(double *pathMetric, double ***llr, uint8_t listSize, uint
}
*/
void updatePathMetric2(double *pathMetric, double ***llr, uint8_t listSize, uint16_t row, uint8_t appr) {
double *pm2=&pathMetric[listSize];
memcpy((void*)pm2,(void*)pathMetric,listSize*sizeof(double*));
void updatePathMetric2(decoder_list_t **dlist, uint8_t listSize, uint16_t row, uint8_t appr) {
int i;
for (i=0;i<listSize;i++) dlist[i+listSize]->pathMetric = dlist[i]->pathMetric;
decoder_list_t **dlist2 = &dlist[listSize];
#ifdef SHOWCOMP
printf("updating path_metric from information bit (%d,%d) \n",
row,0);
......@@ -138,65 +164,36 @@ void updatePathMetric2(double *pathMetric, double ***llr, uint8_t listSize, uint
if (appr) { //eq. (12)
for (i = 0; i < listSize; i++) {
// bitValue=0
if (llr[i][0][row]<0) pathMetric[i] -= llr[i][0][row];
if (dlist[i]->llr[0][row]<0) dlist[i]->pathMetric -= dlist[i]->llr[0][row];
// bitValue=1
else pm2[i] += llr[i][0][row];
else dlist2[i]->pathMetric += dlist[i]->llr[0][row];
}
} else { //eq. (11b)
for (i = 0; i < listSize; i++) {
// bitValue=0
pathMetric[i] += log(1 + exp(-llr[i][0][row]));
dlist[i]->pathMetric += log(1 + exp(-dlist[i]->llr[0][row]));
// bitValue=1
pm2[i] += log(1 + exp(llr[i][0][row]));
dlist2[i]->pathMetric += log(1 + exp(dlist[i]->llr[0][row]));
}
}
}
inline void computeLLR(double ***llr, uint16_t row, uint16_t col, uint8_t listSize,
uint16_t offset, uint8_t approximation) __attribute__((always_inline));
inline void computeLLR(double ***llr, uint16_t row, uint16_t col, uint8_t listSize,
uint16_t offset, uint8_t approximation) {
double a;
double b;
double absA,absB;
#ifdef SHOWCOMP
printf("computeLLR (%d,%d,%d,%d)\n",row,col,offset,i);
#endif
if (approximation) { //eq. (9)
for (int i=0;i<listSize;i++) {
a = llr[i][col + 1][row];
b = llr[i][col+1][row + offset];
absA = fabs(a);
absB = fabs(b);
llr[i][col][row] = copysign(1.0, a) * copysign(1.0, b) * fmin(absA, absB);
}
} else { //eq. (8a)
for (int i=0;i<listSize;i++) {
a = llr[i][col + 1][row];
b = llr[i][col+1][row + offset];
llr[i][col][row] = log((exp(a + b) + 1) / (exp(a) + exp(b)));
}
}
}
void updateCrcChecksum(uint8_t **crcChecksum, uint8_t **crcGen,
uint8_t listSize, uint32_t i2, uint8_t len) {
for (uint8_t i = 0; i < listSize; i++) {
for (uint8_t j = 0; j < len; j++) {
crcChecksum[j][i] = ( (crcChecksum[j][i] + crcGen[i2][j]) % 2 );
}
}
void updateCrcChecksum(decoder_list_t **dlist, uint8_t **crcGen,
uint8_t listSize, uint32_t i2, uint8_t len) {
for (uint8_t i = 0; i < listSize; i++) {
for (uint8_t j = 0; j < len; j++) {
dlist