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Fix channel estimation based on CSI-RS

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This commit is contained in:
Roberto Louro Magueta
2022-05-18 14:31:13 +01:00
parent e5c4e0f3d3
commit 2d96262d7c
1 changed files with 2 additions and 31 deletions
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openair1/PHY/NR_UE_TRANSPORT/csi_rx.c
+2 -31
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@@ -150,34 +150,6 @@ int nr_get_csi_rs_signal(PHY_VARS_NR_UE *ue,
return 0;
}
int get_wf(int kp, int s) {
int wf = 0;
if (kp == 0) {
wf = 1;
} else {
wf = -2*(s%2)+1;
}
return wf;
}
int get_wt(int lp, int s) {
int wt = 0;
if (s < 2) {
wt = 1;
} else if (s < 4) {
wt = -2*(lp%2)+1;
} else if (s < 6) {
wt = -2*(lp/2)+1;
} else {
if ((lp == 0) || (lp == 3)) {
wt = 1;
} else {
wt = -1;
}
}
return wt;
}
uint32_t calc_power_csirs(uint16_t *x, fapi_nr_dl_config_csirs_pdu_rel15_t *csirs_config_pdu) {
uint64_t sum_x = 0;
uint64_t sum_x2 = 0;
@@ -245,9 +217,8 @@ int nr_csi_rs_channel_estimation(PHY_VARS_NR_UE *ue,
// This is not just the LS estimation for each (k,l), but also the sum of the different contributions
// for the sake of optimizing the memory used.
int w = get_wf(kp,s)*get_wt(lp,s);
csi_rs_ls_estimated_channel[kinit<<1] += w*csi_rs_ls_estimated_channel_re;
csi_rs_ls_estimated_channel[(kinit<<1)+1] += w*csi_rs_ls_estimated_channel_im;
csi_rs_ls_estimated_channel[kinit<<1] += csi_rs_ls_estimated_channel_re;
csi_rs_ls_estimated_channel[(kinit<<1)+1] += csi_rs_ls_estimated_channel_im;
}
}
}