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Not include DC for CSI IM measurement

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DC subcarrier has a significantly higher energy compared to other CSI IM
resource elements. This causes the average interference + noise
estimation to be higher than CSI-RS signal power making the CQI 0. With
a third-party gnb that schedules PDSCH based on CQI, the UE never
receives DL DCI once it starts sending CSI reports.
This commit is contained in:
Sakthivel Velumani
2025-08-03 16:53:52 -04:00
parent 350cf8d6ef
commit 39c6cb203c
1 changed files with 2 additions and 0 deletions
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openair1/PHY/NR_UE_TRANSPORT/csi_rx.c
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@@ -782,6 +782,8 @@ static void nr_csi_im_power_estimation(const PHY_VARS_NR_UE *ue,
LOG_I(NR_PHY, "(ant_rx %i, sc %i) real %i, imag %i\n", ant_rx, sc, rx_signal[sc].r, rx_signal[sc].i); LOG_I(NR_PHY, "(ant_rx %i, sc %i) real %i, imag %i\n", ant_rx, sc, rx_signal[sc].r, rx_signal[sc].i);
#endif #endif
if (sc == 0) // skip DC for noise power estimation
continue;
sum_re += rx_signal[sc].r; sum_re += rx_signal[sc].r;
sum_im += rx_signal[sc].i; sum_im += rx_signal[sc].i;
sum2_re += rx_signal[sc].r * rx_signal[sc].r; sum2_re += rx_signal[sc].r * rx_signal[sc].r;