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Use LDPC RM number of useful LLR and rename functions

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master
Xavier Arteaga 4 years ago committed by Xavier Arteaga
parent ecd2c1cdcc
commit 3568f633c3
11 changed files with 33 additions and 56 deletions
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19
lib/include/srsran/phy/fec/ldpc/ldpc_decoder.h
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@ -126,19 +126,6 @@ srsran_ldpc_decoder_decode_f(srsran_ldpc_decoder_t* q, const float* llrs, uint8_
SRSRAN_API int
srsran_ldpc_decoder_decode_s(srsran_ldpc_decoder_t* q, const int16_t* llrs, uint8_t* message, uint32_t cdwd_rm_length);
/*!
* Carries out the actual decoding with 8-bit integer-valued LLRs. It is
* recommended to use a 7-bit representation for the LLRs, given that all
* values exceeding \f$ 2^{7}-1 \f$ (in magnitude) will be considered as infinity.
* \param[in] q A pointer to the LDPC decoder (a srsran_ldpc_decoder_t structure
* instance) that carries out the decoding.
* \param[in] llrs The LLRs obtained from the channel samples that correspond to
* the codeword to be decoded.
* \param[out] message The message (uncoded bits) resulting from the decoding
* operation.
*/
SRSRAN_API int srsran_ldpc_decoder_decode_c(srsran_ldpc_decoder_t* q, const int8_t* llrs, uint8_t* message);
/*!
* Carries out the actual decoding with 8-bit integer-valued LLRs. It is
* recommended to use a 7-bit representation for the LLRs, given that all
@ -151,9 +138,7 @@ SRSRAN_API int srsran_ldpc_decoder_decode_c(srsran_ldpc_decoder_t* q, const int8
* operation.
* \param[in] cdwd_rm_length The number of bits forming the codeword (after rate matching).
*/
SRSRAN_API int srsran_ldpc_decoder_decode_rm_c(srsran_ldpc_decoder_t* q,
const int8_t* llrs,
uint8_t* message,
uint32_t cdwd_rm_length);
SRSRAN_API int
srsran_ldpc_decoder_decode_c(srsran_ldpc_decoder_t* q, const int8_t* llrs, uint8_t* message, uint32_t cdwd_rm_length);
#endif // SRSRAN_LDPCDECODER_H

2
lib/include/srsran/phy/fec/ldpc/ldpc_rm.h
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@ -169,7 +169,7 @@ SRSRAN_API int srsran_ldpc_rm_rx_init_c(srsran_ldpc_rm_t* q);
* \param[in] rv Redundancy version 0,1,2,3.
* \param[in] mod_type Modulation type.
* \param[in] Nref Size of limited buffer.
* \return An integer: 0 if the function executes correctly, -1 otherwise.
* \return An integer: The number of useful LLR if the function executes correctly, -1 otherwise.
*/
SRSRAN_API int srsran_ldpc_rm_rx_c(srsran_ldpc_rm_t* q,
const int8_t* input,

14
lib/src/phy/fec/ldpc/ldpc_decoder.c
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@ -1028,19 +1028,7 @@ int srsran_ldpc_decoder_decode_s(srsran_ldpc_decoder_t* q,
return q->decode_s(q, llrs, message, cdwd_rm_length);
}
int srsran_ldpc_decoder_decode_c(srsran_ldpc_decoder_t* q, const int8_t* llrs, uint8_t* message)
{
uint32_t cdwd_rm_length = q->liftN - 2 * q->ls;
// Trim input LLR to find last zero
while (llrs[cdwd_rm_length - 1] == 0 && cdwd_rm_length > 0) {
cdwd_rm_length--;
}
return q->decode_c(q, llrs, message, cdwd_rm_length);
}
int srsran_ldpc_decoder_decode_rm_c(srsran_ldpc_decoder_t* q,
int srsran_ldpc_decoder_decode_c(srsran_ldpc_decoder_t* q,
const int8_t* llrs,
uint8_t* message,
uint32_t cdwd_rm_length)

3
lib/src/phy/fec/ldpc/ldpc_rm.c
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@ -686,5 +686,6 @@ int srsran_ldpc_rm_rx_c(srsran_ldpc_rm_t* q,
bit_selection_rm_rx_c(tmp_rm_symbol, q->E, output, indices, ini_exclude, end_exclude, q->k0, q->Ncb);
}
return 0;
// Return the number of useful LLR
return (int)((q->k0 + q->E) % q->Ncb);
}

13
lib/src/phy/fec/ldpc/test/ldpc_chain_test.c
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@ -422,8 +422,7 @@ int main(int argc, char** argv)
// Recover messages
gettimeofday(&t[1], NULL);
for (j = 0; j < batch_size; j++) {
srsran_ldpc_decoder_decode_rm_c(
&decoder_c, symbols_c + j * finalN, messages_sim_c + j * finalK, n_useful_symbols);
srsran_ldpc_decoder_decode_c(&decoder_c, symbols_c + j * finalN, messages_sim_c + j * finalK, n_useful_symbols);
}
gettimeofday(&t[2], NULL);
get_time_interval(t);
@ -444,7 +443,7 @@ int main(int argc, char** argv)
// Recover messages
gettimeofday(&t[1], NULL);
for (j = 0; j < batch_size; j++) {
srsran_ldpc_decoder_decode_rm_c(
srsran_ldpc_decoder_decode_c(
&decoder_c_flood, symbols_c + j * finalN, messages_sim_c_flood + j * finalK, n_useful_symbols);
}
gettimeofday(&t[2], NULL);
@ -467,7 +466,7 @@ int main(int argc, char** argv)
// Recover messages
gettimeofday(&t[1], NULL);
for (j = 0; j < batch_size; j++) {
srsran_ldpc_decoder_decode_rm_c(
srsran_ldpc_decoder_decode_c(
&decoder_avx, symbols_c + j * finalN, messages_sim_avx + j * finalK, n_useful_symbols);
}
gettimeofday(&t[2], NULL);
@ -489,7 +488,7 @@ int main(int argc, char** argv)
// Recover messages
gettimeofday(&t[1], NULL);
for (j = 0; j < batch_size; j++) {
srsran_ldpc_decoder_decode_rm_c(
srsran_ldpc_decoder_decode_c(
&decoder_avx_flood, symbols_c + j * finalN, messages_sim_avx_flood + j * finalK, n_useful_symbols);
}
gettimeofday(&t[2], NULL);
@ -513,7 +512,7 @@ int main(int argc, char** argv)
// Recover messages
gettimeofday(&t[1], NULL);
for (j = 0; j < batch_size; j++) {
srsran_ldpc_decoder_decode_rm_c(
srsran_ldpc_decoder_decode_c(
&decoder_avx512, symbols_c + j * finalN, messages_sim_avx512 + j * finalK, n_useful_symbols);
}
gettimeofday(&t[2], NULL);
@ -534,7 +533,7 @@ int main(int argc, char** argv)
// Recover messages
gettimeofday(&t[1], NULL);
for (j = 0; j < batch_size; j++) {
srsran_ldpc_decoder_decode_rm_c(
srsran_ldpc_decoder_decode_c(
&decoder_avx512_flood, symbols_c + j * finalN, messages_sim_avx512_flood + j * finalK, n_useful_symbols);
}
gettimeofday(&t[2], NULL);

2
lib/src/phy/fec/ldpc/test/ldpc_dec_avx2_test.c
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@ -207,7 +207,7 @@ int main(int argc, char** argv)
printf(" codeword %d\n", j);
gettimeofday(&t[1], NULL);
for (l = 0; l < nof_reps; l++) {
srsran_ldpc_decoder_decode_rm_c(&decoder, symbols + j * finalN, messages_sim + j * finalK, finalN);
srsran_ldpc_decoder_decode_c(&decoder, symbols + j * finalN, messages_sim + j * finalK, finalN);
}
gettimeofday(&t[2], NULL);

2
lib/src/phy/fec/ldpc/test/ldpc_dec_avx512_test.c
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@ -206,7 +206,7 @@ int main(int argc, char** argv)
printf(" codeword %d\n", j);
gettimeofday(&t[1], NULL);
for (l = 0; l < nof_reps; l++) {
srsran_ldpc_decoder_decode_rm_c(&decoder, symbols + j * finalN, messages_sim + j * finalK, finalN);
srsran_ldpc_decoder_decode_c(&decoder, symbols + j * finalN, messages_sim + j * finalK, finalN);
}
gettimeofday(&t[2], NULL);

2
lib/src/phy/fec/ldpc/test/ldpc_dec_c_test.c
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@ -197,7 +197,7 @@ int main(int argc, char** argv)
gettimeofday(&t[1], NULL);
for (j = 0; j < NOF_MESSAGES; j++) {
printf(" codeword %d\n", j);
srsran_ldpc_decoder_decode_rm_c(&decoder, symbols + j * finalN, messages_sim + j * finalK, finalN);
srsran_ldpc_decoder_decode_c(&decoder, symbols + j * finalN, messages_sim + j * finalK, finalN);
}
gettimeofday(&t[2], NULL);
get_time_interval(t);

13
lib/src/phy/fec/ldpc/test/ldpc_rm_chain_test.c
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@ -554,7 +554,7 @@ int main(int argc, char** argv)
// Recover messages
gettimeofday(&t[1], NULL);
for (j = 0; j < batch_size; j++) {
srsran_ldpc_decoder_decode_rm_c(
srsran_ldpc_decoder_decode_c(
&decoder_c, symbols_c + j * finalN, messages_sim_c + j * finalK, n_useful_symbols_dec);
}
gettimeofday(&t[2], NULL);
@ -576,7 +576,7 @@ int main(int argc, char** argv)
// Recover messages
gettimeofday(&t[1], NULL);
for (j = 0; j < batch_size; j++) {
srsran_ldpc_decoder_decode_rm_c(
srsran_ldpc_decoder_decode_c(
&decoder_c_flood, symbols_c + j * finalN, messages_sim_c_flood + j * finalK, n_useful_symbols_dec);
}
gettimeofday(&t[2], NULL);
@ -599,7 +599,7 @@ int main(int argc, char** argv)
// Recover messages
gettimeofday(&t[1], NULL);
for (j = 0; j < batch_size; j++) {
srsran_ldpc_decoder_decode_rm_c(
srsran_ldpc_decoder_decode_c(
&decoder_avx, symbols_c + j * finalN, messages_sim_avx + j * finalK, n_useful_symbols_dec);
}
gettimeofday(&t[2], NULL);
@ -621,7 +621,7 @@ int main(int argc, char** argv)
// Recover messages
gettimeofday(&t[1], NULL);
for (j = 0; j < batch_size; j++) {
srsran_ldpc_decoder_decode_rm_c(
srsran_ldpc_decoder_decode_c(
&decoder_avx_flood, symbols_c + j * finalN, messages_sim_avx_flood + j * finalK, n_useful_symbols_dec);
}
gettimeofday(&t[2], NULL);
@ -645,8 +645,7 @@ int main(int argc, char** argv)
// Recover messages
gettimeofday(&t[1], NULL);
for (j = 0; j < batch_size; j++) {
srsran_ldpc_decoder_decode_rm_c(
&decoder_avx512, symbols_c + j * finalN, messages_sim_avx512 + j * finalK, finalN);
srsran_ldpc_decoder_decode_c(&decoder_avx512, symbols_c + j * finalN, messages_sim_avx512 + j * finalK, finalN);
}
gettimeofday(&t[2], NULL);
get_time_interval(t);
@ -667,7 +666,7 @@ int main(int argc, char** argv)
// Recover messages
gettimeofday(&t[1], NULL);
for (j = 0; j < batch_size; j++) {
srsran_ldpc_decoder_decode_rm_c(
srsran_ldpc_decoder_decode_c(
&decoder_avx512_flood, symbols_c + j * finalN, messages_sim_avx512_flood + j * finalK, finalN);
}
gettimeofday(&t[2], NULL);

4
lib/src/phy/fec/ldpc/test/ldpc_rm_test.c
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@ -256,7 +256,8 @@ int main(int argc, char** argv)
exit(-1);
}
if (srsran_ldpc_rm_rx_c(
&rm_rx_c, rm_symbols_c + r * E, unrm_symbols_c + r * N, E, F, base_graph, lift_size, rv, mod_type, Nref)) {
&rm_rx_c, rm_symbols_c + r * E, unrm_symbols_c + r * N, E, F, base_graph, lift_size, rv, mod_type, Nref) <
0) {
exit(-1);
}
@ -269,7 +270,6 @@ int main(int argc, char** argv)
((unrm_symbols[i + r * N] < 0) && (codewords[i + r * N]))) {
// any of these cases are ok
} else {
error = -1;
break;
}

7
lib/src/phy/phch/sch_nr.c
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@ -581,10 +581,15 @@ int sch_nr_decode(srsran_sch_nr_t* q,
tb->rv,
cfg.Qm,
cfg.Nref);
int n_llr =
srsran_ldpc_rm_rx_c(&q->rx_rm, input_ptr, rm_buffer, E, cfg.F, cfg.bg, cfg.Z, tb->rv, tb->mod, cfg.Nref);
if (n_llr < SRSRAN_SUCCESS) {
ERROR("Error in LDPC rate mateching");
return SRSRAN_ERROR;
}
// Decode
srsran_ldpc_decoder_decode_c(decoder, rm_buffer, q->temp_cb);
srsran_ldpc_decoder_decode_c(decoder, rm_buffer, q->temp_cb, n_llr);
// Compute CB CRC
uint32_t cb_len = cfg.Kp - cfg.L_cb;

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