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Solve Issue 2: Rate matching zeroes output data prior to soft-combine

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master
Jesus Gomez 4 years ago committed by Andre Puschmann
parent fb64c2a460
commit 6defd2658c
4 changed files with 34 additions and 24 deletions
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11
lib/include/srslte/phy/fec/ldpc/ldpc_rm.h
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@ -97,7 +97,8 @@ SRSLTE_API int srslte_ldpc_rm_rx_init_f(srslte_ldpc_rm_t* q);
* \param[in] input The LLRs obtained from the channel samples that correspond to
* the codeword to be first, rate-dematched and then decoded.
* \param[out] output The rate-dematched codeword resulting from the rate-dematching
* operation.
* operation. Shall be either initialized to all zeros or to the
* result of previous redundancy versions is available.
* \param[in] E Rate-matched codeword length.
* \param[in] F Number of filler bits.
* \param[in] bg; Current base graph.
@ -131,6 +132,9 @@ SRSLTE_API int srslte_ldpc_rm_rx_init_s(srslte_ldpc_rm_t* q);
* instance) that carries out the rate matching.
* \param[in] input The LLRs obtained from the channel samples that correspond to
* the codeword to be first, rate-dematched and then decoded.
* \param[out] output The rate-dematched codeword resulting from the rate-dematching
* operation. Shall be either initialized to all zeros or to the
* result of previous redundancy versions is available.
* \param[in] E Rate-matched codeword length.
* \param[in] F Number of filler bits.
* \param[in] bg; Current base graph.
@ -165,8 +169,9 @@ SRSLTE_API int srslte_ldpc_rm_rx_init_c(srslte_ldpc_rm_t* q);
* instance) that carries out the rate matching.
* \param[in] input The LLRs obtained from the channel samples that correspond to
* the codeword to be first, rate-dematched and then decoded.
* \param[out] output The rate-dematched codeword resulting from the rate-dematching
* operation.
* \param[out] output The rate-dematched codeword resulting from the rate-dematching
* operation. Shall be either initialized to all zeros or to the
* result of previous redundancy versions is available.
* \param[in] E Rate-matched codeword length.
* \param[in] F Number of filler bits.
* \param[in] bg; Current base graph.

33
lib/src/phy/fec/ldpc/ldpc_rm.c
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@ -191,11 +191,12 @@ static void bit_selection_rm_tx(const uint8_t* input,
* The output has the codeword length N. It inserts filler bits as INFINITY symbols
* (to indicate very reliable 0 bit), and set to 0 (completely unknown bit) all
* missing symbol. Repeated symbols are added.
* The input memory *output shall be either initialized to all zeros or to the
* result of previous redundancy versions is available.
*/
static void bit_selection_rm_rx(const float* input,
const uint32_t in_len,
float* output,
const uint32_t out_len,
uint32_t* indices,
const uint32_t ini_exclude,
const uint32_t end_exclude,
@ -203,7 +204,6 @@ static void bit_selection_rm_rx(const float* input,
const uint32_t Ncb)
{
uint32_t E = in_len;
uint32_t N = out_len;
uint32_t k = 0;
uint32_t j = 0;
@ -217,9 +217,6 @@ static void bit_selection_rm_rx(const float* input,
j = j + 1;
} // while
// Initializes the data_decoded_vector to all zeros
bzero(output, N * sizeof(float));
// set filler bits to INFINITY
for (uint32_t i = ini_exclude; i < end_exclude; i++) {
output[i] = INFINITY;
@ -236,11 +233,12 @@ static void bit_selection_rm_rx(const float* input,
* The output has the codeword length N. It inserts filler bits as INFINITY symbols
* (to indicate very reliable 0 bit), and set to 0 (completely unknown bit) all
* missing symbol. Repeated symbols are added.
* The input memory *output shall be either initialized to all zeros or to the
* result of previous redundancy versions is available.
*/
static void bit_selection_rm_rx_s(const int16_t* input,
const uint32_t in_len,
int16_t* output,
const uint32_t out_len,
uint32_t* indices,
const uint32_t ini_exclude,
const uint32_t end_exclude,
@ -248,7 +246,6 @@ static void bit_selection_rm_rx_s(const int16_t* input,
const uint32_t Ncb)
{
uint32_t E = in_len;
uint32_t N = out_len;
uint32_t k = 0;
uint32_t j = 0;
@ -262,9 +259,6 @@ static void bit_selection_rm_rx_s(const int16_t* input,
j = j + 1;
} // while
// Initializes the data_decoded_vector to all zeros
bzero(output, N * sizeof(int16_t));
// set filler bits to INFINITY
const long infinity16 = (1U << 15U) - 1; // Max positive value in 16-bit representation
for (uint32_t i = ini_exclude; i < end_exclude; i++) {
@ -293,11 +287,12 @@ static void bit_selection_rm_rx_s(const int16_t* input,
* The output has the codeword length N. It inserts filler bits as INFINITY symbols
* (to indicate very reliable 0 bit), and set to 0 (completely unknown bit) all
* missing symbol. Repeated symbols are added.
* The input memory *output shall be either initialized to all zeros or to the
* result of previous redundancy versions is available.
*/
static void bit_selection_rm_rx_c(const int8_t* input,
const uint32_t in_len,
int8_t* output,
const uint32_t out_len,
uint32_t* indices,
const uint32_t ini_exclude,
const uint32_t end_exclude,
@ -305,7 +300,6 @@ static void bit_selection_rm_rx_c(const int8_t* input,
const uint32_t Ncb)
{
uint32_t E = in_len;
uint32_t N = out_len;
uint32_t k = 0;
uint32_t j = 0;
@ -319,9 +313,6 @@ static void bit_selection_rm_rx_c(const int8_t* input,
j = j + 1;
} // while
// Initializes the data_decoded_vector to all zeros
bzero(output, N * sizeof(int8_t));
// set filler bits to INFINITY
const long infinity8 = (1U << 7U) - 1; // Max positive value in 8-bit representation
for (uint32_t i = ini_exclude; i < end_exclude; i++) {
@ -637,10 +628,10 @@ int srslte_ldpc_rm_rx_f(srslte_ldpc_rm_t* q,
uint32_t ini_exclude = end_exclude - q->F;
if (q->mod_order == 1) { // interleaver can be skipped
bit_selection_rm_rx(input, q->E, output, q->N, indices, ini_exclude, end_exclude, q->k0, q->Ncb);
bit_selection_rm_rx(input, q->E, output, indices, ini_exclude, end_exclude, q->k0, q->Ncb);
} else {
bit_interleaver_rm_rx(input, tmp_rm_symbol, q->E, q->mod_order);
bit_selection_rm_rx(tmp_rm_symbol, q->E, output, q->N, indices, ini_exclude, end_exclude, q->k0, q->Ncb);
bit_selection_rm_rx(tmp_rm_symbol, q->E, output, indices, ini_exclude, end_exclude, q->k0, q->Ncb);
}
return 0;
}
@ -669,10 +660,10 @@ int srslte_ldpc_rm_rx_s(srslte_ldpc_rm_t* q,
uint32_t ini_exclude = end_exclude - q->F;
if (q->mod_order == 1) { // interleaver can be skipped
bit_selection_rm_rx_s(input, q->E, output, q->N, indices, ini_exclude, end_exclude, q->k0, q->Ncb);
bit_selection_rm_rx_s(input, q->E, output, indices, ini_exclude, end_exclude, q->k0, q->Ncb);
} else {
bit_interleaver_rm_rx_s(input, tmp_rm_symbol, q->E, q->mod_order);
bit_selection_rm_rx_s(tmp_rm_symbol, q->E, output, q->N, indices, ini_exclude, end_exclude, q->k0, q->Ncb);
bit_selection_rm_rx_s(tmp_rm_symbol, q->E, output, indices, ini_exclude, end_exclude, q->k0, q->Ncb);
}
return 0;
@ -702,10 +693,10 @@ int srslte_ldpc_rm_rx_c(srslte_ldpc_rm_t* q,
uint32_t ini_exclude = end_exclude - q->F;
if (q->mod_order == 1) { // interleaver can be skipped
bit_selection_rm_rx_c(input, q->E, output, q->N, indices, ini_exclude, end_exclude, q->k0, q->Ncb);
bit_selection_rm_rx_c(input, q->E, output, indices, ini_exclude, end_exclude, q->k0, q->Ncb);
} else {
bit_interleaver_rm_rx_c(input, tmp_rm_symbol, q->E, q->mod_order);
bit_selection_rm_rx_c(tmp_rm_symbol, q->E, output, q->N, indices, ini_exclude, end_exclude, q->k0, q->Ncb);
bit_selection_rm_rx_c(tmp_rm_symbol, q->E, output, indices, ini_exclude, end_exclude, q->k0, q->Ncb);
}
return 0;

8
lib/src/phy/fec/ldpc/test/ldpc_rm_chain_test.c
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@ -407,6 +407,14 @@ int main(int argc, char** argv)
}
}
// HARQ procedure. Use previous previous rate-matched outputs if available from the previous redundancy versions,
// otherwise initialize to zeros.
for (i = 0; i < batch_size; i++) {
bzero(symbols + i * finalN, finalN * sizeof(float));
bzero(symbols_s + i * finalN, finalN * sizeof(int16_t));
bzero(symbols_c + i * finalN, finalN * sizeof(int8_t));
}
for (i = 0; i < batch_size; i++) {
if (srslte_ldpc_rm_rx_f(&rm_rx,
rm_symbols + i * rm_length,

6
lib/src/phy/fec/ldpc/test/ldpc_rm_test.c
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@ -250,6 +250,12 @@ int main(int argc, char** argv)
rm_symbols_c[r * E + i] = rm_codewords[r * E + i] ? -1 : 1;
}
// HARQ procedure. Use previous previous rate-matched outputs if available from the previous redundancy versions,
// otherwise initialize to zeros.
bzero(unrm_symbols + r * N, N * sizeof(float));
bzero(unrm_symbols_s + r * N, N * sizeof(int16_t));
bzero(unrm_symbols_c + r * N, N * sizeof(int8_t));
if (srslte_ldpc_rm_rx_f(
&rm_rx, rm_symbols + r * E, unrm_symbols + r * N, E, F, base_graph, lift_size, rv, mod_type, Nref)) {
exit(-1);

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