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srsLTE
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Improved srslte_chest_set_smooth_filter_gauss

This commit is contained in:
Xavier Arteaga 2020-11-30 17:54:12 +01:00 committed by Andre Puschmann
parent c635b1e467
commit 90aa4fbea7
1 changed files with 18 additions and 11 deletions
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29
lib/src/phy/ch_estimation/chest_common.c
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@ -62,19 +62,26 @@ uint32_t srslte_chest_set_smooth_filter_gauss(float* filter, uint32_t order, flo
{
const uint32_t filterlen = order + 1;
const int center = (filterlen - 1) / 2;
float norm_p = 0.0f;
if (filterlen) {
for (int i = 0; i < filterlen; i++) {
filter[i] = expf(-powf(i - center, 2) / (2.0f * powf(std_dev, 2)));
norm_p += powf(filter[i], 2);
}
const float norm = srslte_vec_acc_ff(filter, filterlen);
srslte_vec_sc_prod_fff(filter, 1.0f / norm, filter, filterlen);
if (!filterlen) {
return 0;
}
for (int i = 0; i < filterlen; i++) {
filter[i] = expf(-powf(i - center, 2) / (2.0f * powf(std_dev, 2)));
}
// Calculate average for normalization
const float norm = srslte_vec_acc_ff(filter, filterlen);
// Avoids NAN, INF or ZERO division
if (!isnormal(norm)) {
return 0;
}
// Normalize filter
srslte_vec_sc_prod_fff(filter, 1.0f / norm, filter, filterlen);
return filterlen;
}