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srsLTE
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This commit is contained in:
Xavier Arteaga 2021-10-15 10:48:20 +02:00
parent bdcf90d990
commit 537f165482
1 changed files with 6 additions and 2 deletions
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8
lib/src/phy/phch/pucch_nr.c
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@ -528,14 +528,18 @@ int srsran_pucch_nr_format1_decode(srsran_pucch_nr_t* q,
float llr[SRSRAN_PUCCH_NR_FORMAT1_MAX_NOF_BITS];
srsran_demod_soft_demodulate((nof_bits == 1) ? SRSRAN_MOD_BPSK : SRSRAN_MOD_QPSK, &d, llr, 1);
// Hard decision
// Hard decision based on the LLRs sign
for (uint32_t i = 0; i < nof_bits; i++) {
b[i] = llr[i] > 0.0f ? 1 : 0;
}
// Calculate normalised correlation, it uses the absolute value of d and accumulated average power
if (norm_corr != NULL) {
float nsymb = (float)SRSRAN_CEIL(resource->nof_symbols, 2);
// Get the number of payload symbols. As the one of every 2 symbols carry DMRS, the payload symbols is half of the
// total symbols rounding down
float nsymb = (float)SRSRAN_FLOOR(resource->nof_symbols, 2);
// Avoid zero, INF or NAN division, set correlation to 0 in this case
if (isnormal(pwr_acc) && isnormal(nsymb)) {
*norm_corr = cabsf(d) / sqrtf(pwr_acc * nsymb);
} else {