ue changing pbch dmrs modulation

openair1/PHY/NR_REFSIG/nr_dmrs_rx.c

@@ -41,6 +41,7 @@
 
 #include "refsig_defs_ue.h"
 #include "PHY/defs_nr_UE.h"
+#include "nr_mod_table.h"
 #include "log.h"
 
 /*Table 7.4.1.1.2-1/2 from 38.211 */
@@ -50,7 +51,7 @@ int wf2[12][2] = {{1,1},{1,-1},{1,1},{1,-1},{1,1},{1,-1},{1,1},{1,1},{1,1},{1,-1
 int wt2[12][2] = {{1,1},{1,1},{1,1},{1,1},{1,1},{1,1},{1,-1},{1,-1},{1,-1},{1,-1},{1,-1},{1,-1}};
 
 //short nr_mod_table[14] = {0,0,-23170,-23170,23170,23170,-23170,-23170,-23170,23170,23170,-23170,23170,23170};
-  short nr_mod_table[14] = {0,0,23170,-23170,-23170,23170,23170,-23170,23170,23170,-23170,-23170,-23170,23170};
+  short nr_rx_mod_table[NR_MOD_TABLE_SIZE_SHORT] = {0,0,23170,-23170,-23170,23170,23170,-23170,23170,23170,-23170,-23170,-23170,23170};
 //short nr_mod_table[14] = {0,0,23170,23170,-23170,-23170,23170,23170,23170,-23170,-23170,23170,-23170,-23170};
 //extern short nr_mod_table[NR_MOD_TABLE_SIZE_SHORT];
 
@@ -144,15 +145,19 @@ int nr_pbch_dmrs_rx(unsigned int *nr_gold_pbch,
 					int32_t *output	)
 {
     int m;
+    uint8_t idx=0;
+
+    /// QPSK modulation
+    for (m=0; m<NR_PBCH_DMRS_LENGTH>>1; m++) {
+      idx = ((((nr_gold_pbch[(m<<1)>>5])>>((m<<1)&0x1f))&1)<<1) ^ (((nr_gold_pbch[((m<<1)+1)>>5])>>(((m<<1)+1)&0x1f))&1);
+      ((int16_t*)output)[m<<1] = nr_rx_mod_table[(NR_MOD_TABLE_QPSK_OFFSET + idx)<<1];
+      ((int16_t*)output)[(m<<1)+1] = nr_rx_mod_table[((NR_MOD_TABLE_QPSK_OFFSET + idx)<<1) + 1];
 
-	/// BPSK modulation
-    for (m=0; m<NR_PBCH_DMRS_LENGTH; m++) {
-      ((int16_t*)output)[m<<1] = nr_mod_table[((1 + ((nr_gold_pbch[m>>5]&(1<<(m&0x1f)))>>(m&0x1f)))<<1)];
-      ((int16_t*)output)[(m<<1)+1] = nr_mod_table[((1 + ((nr_gold_pbch[m>>5]&(1<<(m&0x1f)))>>(m&0x1f)))<<1) + 1];
 #ifdef DEBUG_PBCH
-	//printf("nr_gold_pbch[m>>5] %x\n",nr_gold_pbch[m>>5]);
        if (m<16)
+        {printf("nr_gold_pbch[(m<<1)>>5] %x\n",nr_gold_pbch[(m<<1)>>5]);
 	printf("m %d  output %d %d addr %p\n", m, ((int16_t*)output)[m<<1], ((int16_t*)output)[(m<<1)+1],&output[0]);
+	}
 #endif
     }
 

openair1/PHY/NR_REFSIG/nr_mod_table.h

 #define NR_MOD_TABLE_SIZE_SHORT 14
 #define NR_MOD_TABLE_BPSK_OFFSET 1
 #define NR_MOD_TABLE_QPSK_OFFSET 3
-short nr_mod_table[MOD_TABLE_SIZE_SHORT] = {0,0,23170,23170,-23170,-23170,23170,23170,23170,-23170,-23170,23170,-23170,-23170};
+short nr_mod_table[NR_MOD_TABLE_SIZE_SHORT] = {0,0,23170,23170,-23170,-23170,23170,23170,23170,-23170,-23170,23170,-23170,-23170};

openair1/PHY/NR_UE_TRANSPORT/nr_pbch.c

@@ -496,7 +496,7 @@ uint16_t nr_rx_pbch( PHY_VARS_NR_UE *ue,
   uint8_t *decoded_output = nr_ue_pbch_vars->decoded_output;
   //uint16_t crc;
   //short nr_demod_table[8] = {0,0,0,1,1,0,1,1};
-  double nr_demod_table[8] = {0.707,0.707,0.707,-0.707,-0.707,0.707,-0.707,-0.707};
+  double nr_demod_table[8] = {0.707,0.707,-0.707,0.707,0.707,-0.707,-0.707,-0.707};
   double *demod_pbch_e  = malloc (sizeof(double) * 864); 
   unsigned short idx_demod =0;
   int8_t decoderState=0;
@@ -607,8 +607,8 @@ uint16_t nr_rx_pbch( PHY_VARS_NR_UE *ue,
   //polar decoding de-rate matching
   decoderState = polar_decoder(demod_pbch_e, pbch_a, &frame_parms->pbch_polar_params, decoderListSize, aPrioriArray, pathMetricAppr);
 
-  //for (i=0; i<NR_POLAR_PBCH_PAYLOAD_BITS; i++)
-  // printf("pbch_a[%d] = %u \n", i,pbch_a[i]);
+  for (i=0; i<NR_POLAR_PBCH_PAYLOAD_BITS; i++)
+   printf("pbch_a[%d] = %u \n", i,pbch_a[i]);
   
   //un-scrambling
   nr_pbch_unscrambling(frame_parms,pbch_a,NR_POLAR_PBCH_PAYLOAD_BITS);