chaning SNR computation in nr_pbchsim and changing test_case_list.xml accordingly

cmake_targets/autotests/test_case_list.xml

@@ -1065,12 +1065,12 @@
       <pre_exec>$OPENAIR_DIR/cmake_targets/autotests/tools/free_mem.bash</pre_exec>
       <pre_exec_args></pre_exec_args>
       <main_exec> $OPENAIR_DIR/targets/bin/nr_pbchsim.Rel15</main_exec>
-      <main_exec_args>-s-11 -S-10 -n1000 -R106
-                      -s-11 -S-10 -n10 -I -R106
-		      -s-11 -S-10 -n1000 -R217 -N10
-                      -s-11 -S-10 -n10 -I -R217 -N10
-		      -s-11 -S-10 -n1000 -R273 -N20
-                      -s-11 -S-10 -n10 -I -R273 -N20</main_exec_args>
+      <main_exec_args>-s0 -S1 -n1000 -R106
+                      -s0 -S1 -n10 -I -R106
+		      -s0 -S1 -n1000 -R217 -N10
+                      -s0 -S1 -n10 -I -R217 -N10
+		      -s0 -S1 -n1000 -R273 -N20
+                      -s0 -S1 -n10 -I -R273 -N20</main_exec_args>
       <tags>nr_pbchsim.test1 nr_pbchsim.test2</tags>
       <search_expr_true>PBCH test OK</search_expr_true>
       <search_expr_false>segmentation fault|assertion|exiting|fatal</search_expr_false>

openair1/SIMULATION/NR_PHY/pbchsim.c

@@ -510,9 +510,9 @@ int main(int argc, char **argv)
       //multipath_channel(gNB2UE,s_re,s_im,r_re,r_im,frame_length_complex_samples,0);
       
       //AWGN
-      sigma2_dB = 10*log10((double)txlev)-SNR;
+      sigma2_dB = 20*log10((double)AMP/4)-SNR;
       sigma2 = pow(10,sigma2_dB/10);
-      //      printf("sigma2 %f (%f dB)\n",sigma2,sigma2_dB);
+      //printf("sigma2 %f (%f dB), tx_lev %f (%f dB)\n",sigma2,sigma2_dB,txlev,10*log10((double)txlev));
 
       for (i=0; i<frame_parms->samples_per_subframe; i++) {
 	for (aa=0; aa<frame_parms->nb_antennas_rx; aa++) {