Fixed a bug in channel estimation; and updated a dlsim test case

cmake_targets/autotests/test_case_list.xml

@@ -1088,7 +1088,7 @@
                                  (Test7: 106 PRB 51 PDSCH-Offset),
                                  (Test8: 217 PRB 100 PDSCH-PRBs),
                                  (Test9: 217 PRB 80 PDSCH-Offset),
-                                 (Test10: 217 PRB 100 PDSCH-PRBs 80 PDSCH-Offset),
+                                 (Test10: 217 PRB 100 PDSCH-PRBs 110 PDSCH-Offset),
                                  (Test11: 106 PRBs 50 PDSCH-PRBs MCS Index 28</desc>
       <pre_compile_prog></pre_compile_prog>
       <compile_prog>$OPENAIR_DIR/cmake_targets/build_oai</compile_prog>
@@ -1105,7 +1105,7 @@
                   -n100 -R106 -a51
                   -n100 -R217 -b100
                   -n100 -R217 -a80
-                  -n100 -R217 -a80 -b100
+                  -n100 -R217 -a110 -b100
                   -n100 -e28</main_exec_args>
       <tags>nr_dlsim.test1 nr_dlsim.test2 nr_dlsim.test3 nr_dlsim.test4 nr_dlsim.test5 nr_dlsim.test6 nr_dlsim.test7
       nr_dlsim.test8 nr_dlsim.test9 nr_dlsim.test10 nr_dlsim.test11</tags>

openair1/PHY/NR_ESTIMATION/nr_ul_channel_estimation.c

@@ -267,7 +267,8 @@ int nr_pusch_channel_estimation(PHY_VARS_gNB *gNB,
 
 
     // check if PRB crosses DC and improve estimates around DC
-    if ((bwp_start_subcarrier >= gNB->frame_parms.ofdm_symbol_size/2) && (bwp_start_subcarrier+nb_rb_pusch*12 >= gNB->frame_parms.ofdm_symbol_size)) {
+    uint16_t ofdm_symb_size = gNB->frame_parms.ofdm_symbol_size;
+    if ((bwp_start_subcarrier%ofdm_symb_size >= ofdm_symb_size/2) && ((bwp_start_subcarrier+nb_rb_pusch*12)%ofdm_symb_size >= ofdm_symb_size)) {
       ul_ch = (int16_t *)&ul_ch_estimates[aarx][ch_offset];
       uint16_t idxDC = 2*(gNB->frame_parms.ofdm_symbol_size - bwp_start_subcarrier);
       uint16_t idxPil = idxDC/2;

openair1/PHY/NR_UE_ESTIMATION/nr_dl_channel_estimation.c

@@ -874,7 +874,8 @@ int nr_pdsch_channel_estimation(PHY_VARS_NR_UE *ue,
     //}
     
     // check if PRB crosses DC and improve estimates around DC
-    if ((bwp_start_subcarrier >= ue->frame_parms.ofdm_symbol_size/2) && (bwp_start_subcarrier+nb_rb_pdsch*12 >= ue->frame_parms.ofdm_symbol_size)) {
+    uint16_t ofdm_symb_size = ue->frame_parms.ofdm_symbol_size;
+    if ((bwp_start_subcarrier%ofdm_symb_size >= ofdm_symb_size/2) && ((bwp_start_subcarrier+nb_rb_pdsch*12)%ofdm_symb_size >= ofdm_symb_size)) {
       dl_ch = (int16_t *)&dl_ch_estimates[aarx][ch_offset];
       uint16_t idxDC = 2*(ue->frame_parms.ofdm_symbol_size - bwp_start_subcarrier);
       uint16_t idxPil = idxDC/2;