Included DC handling for odd number of RBs

openair1/PHY/NR_UE_ESTIMATION/filt16a_32.c

@@ -141,6 +141,12 @@ short filt8_dcl[8]= {
 short filt8_dcr[8]= {
 0,0,0,4096,8192,12288,16384,0};
 
+short filt8_dcl_h[8]= {
+16384,12288,8192,4096,0,0,0,0};
+
+short filt8_dcr_h[8]= {
+0,4096,8192,1228,16384,0,0,0};
+
 short filt8_l1[8] = {
 24576,16384,0,0,0,0,0,0};
 

openair1/PHY/NR_UE_ESTIMATION/filt16a_32.h

@@ -103,6 +103,10 @@ extern short filt8_dcl[8];
 
 extern short filt8_dcr[8];
 
+extern short filt8_dcl_h[8];
+
+extern short filt8_dcr_h[8];
+
 extern short filt8_l1[8];
 
 extern short filt8_ml1[8];

openair1/PHY/NR_UE_ESTIMATION/nr_dl_channel_estimation.c

@@ -892,10 +892,12 @@ int nr_pdsch_channel_estimation(PHY_VARS_NR_UE *ue,
       uint16_t idxPil = idxDC/2;
       re_offset = k;
       pil = (int16_t *)&pilot[rb_offset*((config_type==0) ? 6:4)];
+      
+      // for proper allignment of SIMD vectors
+      if((ue->frame_parms.N_RB_DL&1)==0) {
           pil += (idxPil-4);
           dl_ch += (idxDC-8);
           dl_ch = memset(dl_ch, 0, sizeof(int16_t)*14);
-      
           re_offset = (re_offset+idxDC/2-4)&(ue->frame_parms.ofdm_symbol_size-1);
           rxF   = (int16_t *)&rxdataF[aarx][(symbol_offset+nushift+re_offset)];
           ch[0] = (int16_t)(((int32_t)pil[0]*rxF[0] - (int32_t)pil[1]*rxF[1])>>15);
@@ -927,19 +929,32 @@ int nr_pdsch_channel_estimation(PHY_VARS_NR_UE *ue,
                                              ch,
                                              dl_ch,
                                              8);
+        } else {
+          pil += (idxPil-2);
+          dl_ch += (idxDC-4);
+          dl_ch = memset(dl_ch, 0, sizeof(int16_t)*10);
+          re_offset = (re_offset+idxDC/2-2)&(ue->frame_parms.ofdm_symbol_size-1);
+          rxF   = (int16_t *)&rxdataF[aarx][(symbol_offset+nushift+re_offset)];
+          ch[0] = (int16_t)(((int32_t)pil[0]*rxF[0] - (int32_t)pil[1]*rxF[1])>>15);
+          ch[1] = (int16_t)(((int32_t)pil[0]*rxF[1] + (int32_t)pil[1]*rxF[0])>>15);
           
-/*
-      pil += 2;
-      re_offset = (re_offset+2)&(ue->frame_parms.ofdm_symbol_size-1);
+          multadd_real_vector_complex_scalar(filt8_dcl_h,
+                                             ch,
+                                             dl_ch,
+                                             8);
+          
+          pil += 4;
+          re_offset = (re_offset+4)&(ue->frame_parms.ofdm_symbol_size-1);
           rxF   = (int16_t *)&rxdataF[aarx][(symbol_offset+nushift+re_offset)];
           ch[0] = (int16_t)(((int32_t)pil[0]*rxF[0] - (int32_t)pil[1]*rxF[1])>>15);
           ch[1] = (int16_t)(((int32_t)pil[0]*rxF[1] + (int32_t)pil[1]*rxF[0])>>15);
           
-      multadd_real_vector_complex_scalar(filt8_dcmd,
+          multadd_real_vector_complex_scalar(filt8_dcr_h,
                                              ch,
                                              dl_ch,
                                              8);
-*/                                         
+      }
+
     }
 
 #ifdef DEBUG_PDSCH