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Merge remote-tracking branch 'origin/remove_power_reduction_for_MIMO' into integration_2024_w42 (!3004)

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This hotfix removes division by num_antenna_ports in PDSCH precoding matrix generation.
These matrices are defined for CSI reporting in this way but here we are using them for
transmission and this results in an unwanted 10*log10(num_antenna_ports) reduction in
transmit power (3dB for 2 antenna ports, 6dB for 4 antenna ports, etc.)
This commit is contained in:
Jaroslava Fiedlerova
2024-10-18 14:54:28 +02:00
parent 1917f5486d d2ebc356a0
commit 6a54905b2e
1 changed files with 2 additions and 2 deletions
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openair2/LAYER2/NR_MAC_gNB/config.c
+2 -2
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@@ -136,7 +136,7 @@ int precoding_weigths_generation(nfapi_nr_pm_list_t *mat,
double complex res_code;
for (int i_rows = 0; i_rows < N1 * N2; i_rows++) {
nfapi_nr_pm_weights_t *weights = &mat->pmi_pdu[pmiq].weights[j_col][i_rows];
res_code = sqrt(1 / (double)(L * num_antenna_ports)) * v_lm[llc][mmc][i_rows];
res_code = sqrt(1 / (double)L) * v_lm[llc][mmc][i_rows];
c16_t precoder_weight = convert_precoder_weight(res_code);
weights->precoder_weight_Re = precoder_weight.r;
weights->precoder_weight_Im = precoder_weight.i;
@@ -153,7 +153,7 @@ int precoding_weigths_generation(nfapi_nr_pm_list_t *mat,
}
for (int i_rows = N1 * N2; i_rows < 2 * N1 * N2; i_rows++) {
nfapi_nr_pm_weights_t *weights = &mat->pmi_pdu[pmiq].weights[j_col][i_rows];
res_code = sqrt(1 / (double)(L * num_antenna_ports)) * (phase_sign)*theta_n[nn] * v_lm[llc][mmc][i_rows - N1 * N2];
res_code = sqrt(1 / (double)L) * (phase_sign)*theta_n[nn] * v_lm[llc][mmc][i_rows - N1 * N2];
c16_t precoder_weight = convert_precoder_weight(res_code);
weights->precoder_weight_Re = precoder_weight.r;
weights->precoder_weight_Im = precoder_weight.i;