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Commit 52669a08 authored by Raymond Knopp's avatar Raymond Knopp
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order of dimensions on llr array

parent ee1ea7e5
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Showing with 30 additions and 23 deletions
openair1/PHY/CODING/nrPolar_tools/nr_polar_decoder.c
View file @ 52669a08
......@@ -40,7 +40,7 @@ int8_t polar_decoder(
uint8_t ***bit = nr_alloc_uint8_t_3D_array(polarParams->N, (polarParams->n+1), 2*listSize);
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(polarParams->N, (polarParams->n+1), 2*listSize);
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
......@@ -92,7 +92,7 @@ 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);
for (int j = 0; j < polarParams->N; j++) llr[j][polarParams->n][0]=d_tilde[j];
for (int j = 0; j < polarParams->N; j++) llr[0][polarParams->n][j]=d_tilde[j];
/*
......@@ -130,7 +130,7 @@ int8_t polar_decoder(
for (int j = 0; j < polarParams->N; j++) {
for (int k = 0; k < (polarParams->n+1); k++) {
bit[j][k][i+currentListSize]=bit[j][k][i];
llr[j][k][i+currentListSize]=llr[j][k][i];}}}
llr[i+currentListSize][k][j]=llr[i][k][j];}}}
for (int i = 0; i < currentListSize; i++) {
bit[currentBit][0][i]=0;
......@@ -167,7 +167,7 @@ int8_t polar_decoder(
for (int i=0; i<polarParams->N; i++) {
for (int j=0; j<(polarParams->n+1); j++) {
bit[i][j][listIndex[(2*listSize-1)-k]]=bit[i][j][listIndex[k]];
llr[i][j][listIndex[(2*listSize-1)-k]]=llr[i][j][listIndex[k]];
llr[listIndex[(2*listSize-1)-k]][j][i]=llr[listIndex[k]][j][i];
}
}
}
......@@ -188,7 +188,7 @@ int8_t polar_decoder(
for (int i = 0; i < polarParams->N; i++) {
for (int j = 0; j < (polarParams->n + 1); j++) {
bit[i][j][k] = bit[i][j][copyIndex];
llr[i][j][k] = llr[i][j][copyIndex];
llr[k][j][i] = llr[copyIndex][j][i];
}
}
}
......@@ -236,7 +236,7 @@ int8_t polar_decoder(
free(pathMetric);
free(crcState);
nr_free_uint8_t_3D_array(bit, polarParams->N, (polarParams->n+1));
nr_free_double_3D_array(llr, polarParams->N, (polarParams->n+1));
nr_free_double_3D_array(llr, 2*listSize, (polarParams->n+1));
nr_free_uint8_t_2D_array(crcChecksum, polarParams->crcParityBits);
return(-1);
}
......@@ -271,7 +271,7 @@ int8_t polar_decoder(
free(pathMetric);
free(crcState);
nr_free_uint8_t_3D_array(bit, polarParams->N, (polarParams->n+1));
nr_free_double_3D_array(llr, polarParams->N, (polarParams->n+1));
nr_free_double_3D_array(llr, 2*listSize, (polarParams->n+1));
nr_free_uint8_t_2D_array(crcChecksum, polarParams->crcParityBits);
nr_free_uint8_t_2D_array(extended_crc_generator_matrix, polarParams->K);
nr_free_uint8_t_2D_array(tempECGM, polarParams->K);
......
openair1/PHY/CODING/nrPolar_tools/nr_polar_decoding_tools.c
View file @ 52669a08
......@@ -36,7 +36,7 @@ void updateLLR(double ***llr, uint8_t **llrU, uint8_t ***bit, uint8_t **bitU,
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);
#endif
llr[row][col][i] = (pow((-1),bit[row-offset][col][i])*llr[row-offset][col+1][i]) + llr[row][col+1][i];
llr[i][col][row] = (pow((-1),bit[row-offset][col][i])*llr[i][col+1][row-offset]) + llr[i][col+1][row];
}
} else {
if (llrU[row][col+1]==0) updateLLR(llr, llrU, bit, bitU, listSize, row, (col+1), xlen, ylen, approximation);
......@@ -84,11 +84,11 @@ 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[row][0][i]) )) pathMetric[i] += fabs(llr[row][0][i]);
if ((2*bitValue) != ( 1 - copysign(1.0,llr[i][0][row]) )) pathMetric[i] += fabs(llr[i][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[row][0][i]) ) ;
for (uint8_t i=0; i<listSize; i++) pathMetric[i] += log ( 1 + exp(multiplier*llr[i][0][row]) ) ;
}
}
......@@ -138,25 +138,27 @@ void updatePathMetric2(double *pathMetric, double ***llr, uint8_t listSize, uint
if (appr) { //eq. (12)
for (i = 0; i < listSize; i++) {
// bitValue=0
if (llr[row][0][i]<0) pathMetric[i] -= llr[row][0][i];
if (llr[i][0][row]<0) pathMetric[i] -= llr[i][0][row];
// bitValue=1
else pm2[i] += llr[row][0][i];
else pm2[i] += llr[i][0][row];
}
} else { //eq. (11b)
for (i = 0; i < listSize; i++) {
// bitValue=0
pathMetric[i] += log(1 + exp(-llr[row][0][i]));
pathMetric[i] += log(1 + exp(-llr[i][0][row]));
// bitValue=1
pm2[i] += log(1 + exp(llr[row][0][i]));
pm2[i] += log(1 + exp(llr[i][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)) {
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 = llr[row][col + 1];
double *b = llr[row + offset][col + 1];
double a;
double b;
double absA,absB;
......@@ -164,14 +166,19 @@ inline void computeLLR(double ***llr, uint16_t row, uint16_t col, uint8_t listSi
printf("computeLLR (%d,%d,%d,%d)\n",row,col,offset,i);
#endif
if (approximation) { //eq. (9)
for (int i=0;i<listSize;i++) {
absA = fabs(a[i]);
absB = fabs(b[i]);
llr[row][col][i] = copysign(1.0, a[i]) * copysign(1.0, b[i]) * fmin(absA, absB);
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++)
llr[row][col][i] = log((exp(a[i] + b[i]) + 1) / (exp(a[i]) + exp(b[i])));
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)));
}
}
}
......
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