NR MIMO 2x2 Support

This commit provides CSI reporting support
which is required for MIMO.  It also updates
the configuration files, provides sample BLER
simualtion files for packet dropping in the
MIMO 2x2 case. It also includes the hooks
and functions (e.g., updating UCI2_3_4 PDU field)
for MIMO 2x2 support. This commit will not include
any channel abstraction code or modelling.

openair2/NR_UE_PHY_INTERFACE/NR_Packet_Drop.c

@@ -181,3 +181,27 @@ bool should_drop_transport_block(int slot, uint16_t rnti)
   }
   return false;
 }
+
+int get_mcs_from_sinr(nr_bler_struct *nr_bler_data, float sinr)
+{
+  if (sinr < (nr_bler_data[0].bler_table[0][0])) {
+    LOG_I(NR_MAC, "The SINR found is smaller than first MCS table\n");
+    return 0;
+  }
+
+  if (sinr > (nr_bler_data[NR_NUM_MCS-1].bler_table[nr_bler_data[NR_NUM_MCS-1].length - 1][0])) {
+    LOG_I(NR_MAC, "The SINR found is larger than last MCS table\n");
+    return NR_NUM_MCS-1;
+  }
+
+  for (int n = NR_NUM_MCS-1; n >= 0; n--) {
+    float largest_sinr = (nr_bler_data[n].bler_table[nr_bler_data[n].length - 1][0]);
+    float smallest_sinr = (nr_bler_data[n].bler_table[0][0]);
+    if (sinr < largest_sinr && sinr > smallest_sinr) {
+      LOG_I(NR_MAC, "The SINR found in MCS %d table\n", n);
+      return n;
+    }
+  }
+  LOG_E(NR_MAC, "Unable to get an MCS value.\n");
+  abort();
+}