maki/openairinterface5g
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

SRS channel interpolation improved for comb_size 4

Browse Source
This commit is contained in:
rmagueta
2022-01-11 10:32:48 +00:00
parent d14d36747d
commit 5a34801a94
3 changed files with 31 additions and 16 deletions
Download Patch File Download Diff File Expand all files Collapse all files
openair1/PHY/NR_ESTIMATION/nr_ul_channel_estimation.c
+15 -15
View File
@@ -1152,21 +1152,21 @@ int nr_srs_channel_estimation(PHY_VARS_gNB *gNB,
srs_estimated_channel16 = (int16_t *)&srs_estimated_channel_freq[ant][nr_srs_info->sc_list[sc_idx]];
}
} else {
if(sc_idx>0) {
multadd_real_vector_complex_scalar(filt8_dcr0_h, ls_estimated, srs_estimated_channel16, 8);
if(nr_srs_info->sc_list[sc_idx] < nr_srs_info->sc_list[sc_idx - 1]) {
srs_estimated_channel16 = (int16_t *)&srs_estimated_channel_freq[ant][nr_srs_info->sc_list[sc_idx + 1]] - 8;
} else {
srs_estimated_channel16 = (int16_t *)&srs_estimated_channel_freq[ant][nr_srs_info->sc_list[sc_idx]];
}
srs_estimated_channel16[0] = 0;
srs_estimated_channel16[1] = 0;
}
multadd_real_vector_complex_scalar(filt8_dcl0_h, ls_estimated, srs_estimated_channel16, 8);
if(sc_idx == (nr_srs_info->sc_list_length - 1)) {
srs_estimated_channel_freq[ant][nr_srs_info->sc_list[sc_idx] + 1] = srs_estimated_channel_freq[ant][nr_srs_info->sc_list[sc_idx]];
srs_estimated_channel_freq[ant][nr_srs_info->sc_list[sc_idx] + 2] = srs_estimated_channel_freq[ant][nr_srs_info->sc_list[sc_idx]];
srs_estimated_channel_freq[ant][nr_srs_info->sc_list[sc_idx] + 3] = srs_estimated_channel_freq[ant][nr_srs_info->sc_list[sc_idx]];
if(sc_idx == 0) { // First subcarrier case
// filt16_start is {12288,8192,8192,8192,4096,0,0,0,0,0,0,0,0,0,0,0}
multadd_real_vector_complex_scalar(filt16_start, ls_estimated, srs_estimated_channel16, 16);
} else if(nr_srs_info->sc_list[sc_idx] < nr_srs_info->sc_list[sc_idx - 1]) { // Start of OFDM symbol case
srs_estimated_channel16 = (int16_t *)&srs_estimated_channel_freq[ant][nr_srs_info->sc_list[sc_idx + 1]] - 8;
// filt16_start is {12288,8192,8192,8192,4096,0,0,0,0,0,0,0,0,0,0,0}
multadd_real_vector_complex_scalar(filt16_start, ls_estimated, srs_estimated_channel16, 16);
} else if((sc_idx < (nr_srs_info->sc_list_length - 1) && nr_srs_info->sc_list[sc_idx + 1] < nr_srs_info->sc_list[sc_idx])
|| (sc_idx == (nr_srs_info->sc_list_length - 1))) { // End of OFDM symbol or last subcarrier cases
// filt16_end is {4096,8192,8192,8192,12288,16384,16384,16384,0,0,0,0,0,0,0,0}
multadd_real_vector_complex_scalar(filt16_end, ls_estimated, srs_estimated_channel16, 16);
} else { // Middle case
// filt16_middle4 is {4096,8192,8192,8192,8192,8192,8192,8192,4096,0,0,0,0,0,0,0}
multadd_real_vector_complex_scalar(filt16_middle4, ls_estimated, srs_estimated_channel16, 16);
srs_estimated_channel16 = (int16_t *)&srs_estimated_channel_freq[ant][nr_srs_info->sc_list[sc_idx]];
}
}
openair1/PHY/NR_UE_ESTIMATION/filt16a_32.c
+11 -1
View File
@@ -272,4 +272,14 @@ short filt8_middle4[8] = {
0,0,4096,8192,8192,8192,4096,0};
short filt8_end[8] = {
4096,8192,12288,16384,0,0,0,0};
4096,8192,12288,16384,0,0,0,0};
// Comb size 4
short filt16_start[16] = {
12288,8192,8192,8192,4096,0,0,0,0,0,0,0,0,0,0,0};
short filt16_middle4[16] = {
4096,8192,8192,8192,8192,8192,8192,8192,4096,0,0,0,0,0,0,0};
short filt16_end[16] = {
4096,8192,8192,8192,12288,16384,16384,16384,0,0,0,0,0,0,0,0};
openair1/PHY/NR_UE_ESTIMATION/filt16a_32.h
+5
View File
@@ -188,4 +188,9 @@ extern short filt8_start[8];
extern short filt8_middle2[8];
extern short filt8_middle4[8];
extern short filt8_end[8];
/*Comb size 4*/
extern short filt16_start[16];
extern short filt16_middle4[16];
extern short filt16_end[16];
#endif