Fix bug in LLR threshold buffer

The LLR threshold buffers hold only for one symbol but the LLRs are
computed for all symbols together. So only the threshold of last symbol
was used for computing LLR for all other symbols.

This commit calls nr_dlsch_llr for each symbol togther with rest of
nr_rx_pdsch() and calls nr_dlsch_layer_demapping at the last symbol.

Fixes issue 948.

openair1/SCHED_NR_UE/phy_procedures_nr_ue.c

@@ -605,6 +605,15 @@ static int nr_ue_pdsch_procedures(PHY_VARS_NR_UE *ue,
     uint32_t llr_offset[NR_SYMBOLS_PER_SLOT] = {0};
 
     int32_t log2_maxh = 0;
+
+    const uint32_t rx_llr_layer_size = (G + dlsch[0].Nl - 1) / dlsch[0].Nl;
+
+    if (dlsch[0].Nl == 0 || rx_llr_layer_size == 0 || rx_llr_layer_size > 10 * 1000 * 1000) {
+      LOG_E(PHY, "rx_llr_layer_size %d, G %d, Nl, %d, discarding this pdsch\n", rx_llr_layer_size, G, dlsch[0].Nl);
+      return -1;
+    }
+    __attribute__((aligned(32))) int16_t layer_llr[dlsch[0].Nl][rx_llr_layer_size];
+
     start_meas_nr_ue_phy(ue, RX_PDSCH_STATS);
     pdsch_scope_req_t scope_req = { .copy_chanest_to_scope = false,
                                     .copy_rxdataF_to_scope = false,
@@ -639,6 +648,8 @@ static int nr_ue_pdsch_procedures(PHY_VARS_NR_UE *ue,
                       harq_pid,
                       pdsch_est_size,
                       pdsch_dl_ch_estimates,
+                      rx_llr_layer_size,
+                      layer_llr,
                       llr,
                       dl_valid_re,
                       rxdataF,