git-svn-id: http://svn.eurecom.fr/openair4G/trunk@5352 818b1a75-f10b-46b9-bf7c-635c3b92a50f

openair1/PHY/LTE_REFSIG/lte_dl_uespec.c

+/*******************************************************************************
+
+  Eurecom OpenAirInterface
+  Copyright(c) 1999 - 2014 Eurecom
+
+  This program is free software; you can redistribute it and/or modify it
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+  version 2, as published by the Free Software Foundation.
+
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+  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
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+
+  You should have received a copy of the GNU General Public License along with
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+  The full GNU General Public License is included in this distribution in
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+
+  Contact Information
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+*******************************************************************************/
+
+/*! \file PHY/LTE_REFSIG/lte_dl_uespec.c
+* \brief Top-level routines for generating UE-specific Reference signals from 36-211, V11.3.0 2013-06
+* \author R. Knopp
+* \date 2014
+* \version 0.1
+* \company Eurecom
+* \email: knopp@eurecom.fr
+* \note
+* \warning
+*/
+
+#ifdef USER_MODE
+#include <stdio.h>
+#include <stdlib.h>
+#endif
+
+#include "defs.h"
+#include "PHY/defs.h"
+#include "log.h"
+
+//extern unsigned int lte_gold_table[3][20][2][14];
+//#define DEBUG_DL_CELL_SPEC
+
+int Wbar_NCP[8][4] = {{1,1,1,1},{1,-1,1,-1},{1,1,1,1},{1,-1,1,-1},{1,1,-1,-1},{-1,-1,1,1},{1,-1,-1,1},{-1,1,1,-1}};
+
+int lte_dl_ue_spec(PHY_VARS_eNB *phy_vars_eNB,
+		   uint8_t UE_id,
+		   mod_sym_t *output,
+		   short amp,
+		   uint8_t Ns,
+		   uint8_t p,
+		   int SS_flag ) {
+
+  mod_sym_t qpsk[4],nqpsk[4],*qpsk_p,*output_p;
+  int16_t a;
+  int w,lprime,ind,l,ind_dword,ind_qpsk_symb,nPRB;
+  //  LTE_eNB_DLSCH_t *dlsch = phy_vars_eNB->dlsch_eNB[UE_id][0];
+
+  a = (amp*ONE_OVER_SQRT2_Q15)>>15;
+  ((short *)&qpsk[0])[0] = a;
+  ((short *)&qpsk[0])[1] = a;
+  ((short *)&qpsk[1])[0] = -a;
+  ((short *)&qpsk[1])[1] = a;
+  ((short *)&qpsk[2])[0] = a;
+  ((short *)&qpsk[2])[1] = -a;
+  ((short *)&qpsk[3])[0] = -a;
+  ((short *)&qpsk[3])[1] = -a;
+
+  ((short *)&nqpsk[0])[0] = -a;
+  ((short *)&nqpsk[0])[1] = -a;
+  ((short *)&nqpsk[1])[0] = a;
+  ((short *)&nqpsk[1])[1] = -a;
+  ((short *)&nqpsk[2])[0] = -a;
+  ((short *)&nqpsk[2])[1] = a;
+  ((short *)&nqpsk[3])[0] = a;
+  ((short *)&nqpsk[3])[1] = a;
+
+  if (p>=7) {
+    if (SS_flag==0) {
+      if (phy_vars_eNB->lte_frame_parms.Ncp == NORMAL) {
+	// this is 3GPP 36-211 6.10.3.2, NORMAL CP, p>=7
+
+
+
+	// position output pointer to 5th symbol in slot
+	output_p = output+(60*phy_vars_eNB->lte_frame_parms.N_RB_DL);
+	// shift to 2nd RE in PRB for p=7,8,11,13
+	if ((p==7) || (p==8) || (p==11) || (p==13)) output_p++;
+	
+
+	for (lprime=0;lprime<2;lprime++) {
+	  
+	  ind = 3*lprime*phy_vars_eNB->lte_frame_parms.N_RB_DL;
+	  l = lprime + ((Ns&1)<<1);
+
+	  // loop over pairs of PRBs, this is the periodicity of the W_bar_NCP sequence
+	  // unroll the computations for the 6 pilots, select qpsk or nqpsk as function of W_bar_NCP
+	  for (nPRB=0;nPRB<phy_vars_eNB->lte_frame_parms.N_RB_DL;nPRB+=2) {
+ 
+	    // First pilot 	    
+	    w = Wbar_NCP[p-7][l];
+	    qpsk_p = (w==1) ? qpsk : nqpsk;
+
+
+	    ind_dword     = ind>>4;
+	    ind_qpsk_symb = ind&0xf;
+	    
+	    *output_p = qpsk_p[(phy_vars_eNB->lte_gold_uespec_table[0][Ns][lprime][ind_dword]>>(2*ind_qpsk_symb))&3];
+
+
+#ifdef DEBUG_DL_UESPEC
+	    LOG_D(PHY,"Ns %d, l %d, m %d,ind_dword %d, ind_qpsk_symbol %d\n",
+		  Ns,l,m,mprime_dword,mprime_qpsk_symb);
+	    LOG_D(PHY,"index = %d\n",(phy_vars_eNB->lte_gold_uespec_table[0][Ns][lprime][ind_dword]>>(2*ind_qpsk_symb))&3);
+#endif 
+
+	    output_p+=5;	    
+	    ind++;
+
+	    w =  Wbar_NCP[p-7][3-l];
+	    qpsk_p = (w==1) ? qpsk : nqpsk;
+
+	    // Second pilot 
+	    ind_dword     = ind>>4;
+	    ind_qpsk_symb = ind&0xf;
+	    
+	    *output_p = qpsk_p[(phy_vars_eNB->lte_gold_uespec_table[0][Ns][lprime][ind_dword]>>(2*ind_qpsk_symb))&3];
+	    
+#ifdef DEBUG_DL_UESPEC
+	    LOG_D(PHY,"Ns %d, l %d, m %d,ind_dword %d, ind_qpsk_symbol %d\n",
+		  Ns,l,m,mprime_dword,mprime_qpsk_symb);
+	    LOG_D(PHY,"index = %d\n",(phy_vars_eNB->lte_gold_uespec_table[0][Ns][lprime][ind_dword]>>(2*ind_qpsk_symb))&3);
+#endif 
+
+	    output_p+=5;	    
+	    ind++;
+
+	    w = Wbar_NCP[p-7][l];
+	    qpsk_p = (w==1) ? qpsk : nqpsk;
+	    // Third pilot 
+	    ind_dword     = ind>>4;
+	    ind_qpsk_symb = ind&0xf;
+	    
+	    *output_p = qpsk_p[(phy_vars_eNB->lte_gold_uespec_table[0][Ns][lprime][ind_dword]>>(2*ind_qpsk_symb))&3];
+	    
+#ifdef DEBUG_DL_UESPEC
+	    LOG_D(PHY,"Ns %d, l %d, m %d,ind_dword %d, ind_qpsk_symbol %d\n",
+		  Ns,l,m,mprime_dword,mprime_qpsk_symb);
+	    LOG_D(PHY,"index = %d\n",(phy_vars_eNB->lte_gold_uespec_table[0][Ns][lprime][ind_dword]>>(2*ind_qpsk_symb))&3);
+#endif 
+
+	    output_p+=2;	    
+	    ind++;
+
+	    // Fourth pilot 	    
+	    w = Wbar_NCP[p-7][3-l];
+	    qpsk_p = (w==1) ? qpsk : nqpsk;
+
+
+	    ind_dword     = ind>>4;
+	    ind_qpsk_symb = ind&0xf;
+	    
+	    *output_p = qpsk_p[(phy_vars_eNB->lte_gold_uespec_table[0][Ns][lprime][ind_dword]>>(2*ind_qpsk_symb))&3];
+
+
+#ifdef DEBUG_DL_UESPEC
+	    LOG_D(PHY,"Ns %d, l %d, m %d,ind_dword %d, ind_qpsk_symbol %d\n",
+		  Ns,l,m,mprime_dword,mprime_qpsk_symb);
+	    LOG_D(PHY,"index = %d\n",(phy_vars_eNB->lte_gold_uespec_table[0][Ns][lprime][ind_dword]>>(2*ind_qpsk_symb))&3);
+#endif 
+
+	    output_p+=5;	    
+	    ind++;
+
+	    w =  Wbar_NCP[p-7][l];
+	    qpsk_p = (w==1) ? qpsk : nqpsk;
+
+	    // Fifth pilot 
+	    ind_dword     = ind>>4;
+	    ind_qpsk_symb = ind&0xf;
+	    
+	    *output_p = qpsk_p[(phy_vars_eNB->lte_gold_uespec_table[0][Ns][lprime][ind_dword]>>(2*ind_qpsk_symb))&3];
+	    
+#ifdef DEBUG_DL_UESPEC
+	    LOG_D(PHY,"Ns %d, l %d, m %d,ind_dword %d, ind_qpsk_symbol %d\n",
+		  Ns,l,m,mprime_dword,mprime_qpsk_symb);
+	    LOG_D(PHY,"index = %d\n",(phy_vars_eNB->lte_gold_uespec_table[0][Ns][lprime][ind_dword]>>(2*ind_qpsk_symb))&3);
+#endif 
+
+	    output_p+=5;	    
+	    ind++;
+
+	    w = Wbar_NCP[p-7][3-l];
+	    qpsk_p = (w==1) ? qpsk : nqpsk;
+	    // Sixth pilot 
+	    ind_dword     = ind>>4;
+	    ind_qpsk_symb = ind&0xf;
+	    
+	    *output_p = qpsk_p[(phy_vars_eNB->lte_gold_uespec_table[0][Ns][lprime][ind_dword]>>(2*ind_qpsk_symb))&3];
+	    
+#ifdef DEBUG_DL_UESPEC
+	    LOG_D(PHY,"Ns %d, l %d, m %d,ind_dword %d, ind_qpsk_symbol %d\n",
+		  Ns,l,m,mprime_dword,mprime_qpsk_symb);
+	    LOG_D(PHY,"index = %d\n",(phy_vars_eNB->lte_gold_uespec_table[0][Ns][lprime][ind_dword]>>(2*ind_qpsk_symb))&3);
+#endif 
+
+	    output_p+=2;	    
+	    ind++;
+	  }
+	}
+      }
+      else {
+	LOG_E(PHY,"Special subframe not supported for UE specific pilots yet\n");
+      }
+    }
+  }
+  else if (p==5) {
+    LOG_E(PHY,"p=5 not supported for UE specific pilots yet\n");
+  }
+  else {
+    LOG_E(PHY,"Illegal p %d UE specific pilots\n",p);
+  }
+  return(0);
+}
+
+/*
+int lte_dl_cell_spec_rx(PHY_VARS_UE *phy_vars_ue,
+			uint8_t eNB_offset,
+			int *output,
+			unsigned char Ns,
+			unsigned char l,
+			unsigned char p) {
+  
+
+  unsigned char mprime,mprime_dword,mprime_qpsk_symb,m;
+  unsigned short k=0;
+  unsigned int qpsk[4];
+  short pamp;
+  
+  // Compute the correct pilot amplitude, sqrt_rho_b = Q3.13
+  pamp = ONE_OVER_SQRT2_Q15;
+
+  // This includes complex conjugate for channel estimation
+
+  ((short *)&qpsk[0])[0] = pamp;
+  ((short *)&qpsk[0])[1] = -pamp;
+  ((short *)&qpsk[1])[0] = -pamp;
+  ((short *)&qpsk[1])[1] = -pamp;
+  ((short *)&qpsk[2])[0] = pamp;
+  ((short *)&qpsk[2])[1] = pamp;
+  ((short *)&qpsk[3])[0] = -pamp;
+  ((short *)&qpsk[3])[1] = pamp;
+
+  mprime = 110 - phy_vars_ue->lte_frame_parms.N_RB_DL;
+  
+  for (m=0;m<phy_vars_ue->lte_frame_parms.N_RB_DL<<1;m++) {
+
+    mprime_dword     = mprime>>4;
+    mprime_qpsk_symb = mprime&0xf;
+
+    // this is r_mprime from 3GPP 36-211 6.10.1.2 
+    output[k] = qpsk[(phy_vars_ue->lte_gold_table[eNB_offset][Ns][l][mprime_dword]>>(2*mprime_qpsk_symb))&3];
+#ifdef DEBUG_DL_CELL_SPEC
+    printf("Ns %d, l %d, m %d,mprime_dword %d, mprime_qpsk_symbol %d\n",
+	   Ns,l,m,mprime_dword,mprime_qpsk_symb);
+    printf("index = %d (k %d)\n",(phy_vars_ue->lte_gold_table[eNB_offset][Ns][l][mprime_dword]>>(2*mprime_qpsk_symb))&3,k);
+#endif 
+
+    mprime++;
+#ifdef DEBUG_DL_CELL_SPEC
+    if (m<4)
+    printf("Ns %d l %d output[%d] = (%d,%d)\n",Ns,l,k,((short *)&output[k])[0],((short *)&output[k])[1]);
+#endif
+    k++;
+  }
+  return(0);
+}
+
+*/
+
+#ifdef LTE_DL_CELL_SPEC_MAIN
+
+
+
+//extern int write_output(const char *,const char *,void *,int,int,char);
+// flag change eren
+extern int write_output(const char *,const char *,void *,int,int,char);
+main() {
+
+  unsigned short Nid_cell=0;
+  unsigned int Ncp = 0;
+  int output00[1024];
+  int output01[1024];
+  int output10[1024];
+  int output11[1024];
+
+  memset(output00,0,1024*sizeof(int));
+  memset(output01,0,1024*sizeof(int));  
+  memset(output10,0,1024*sizeof(int));
+  memset(output11,0,1024*sizeof(int));
+
+  lte_gold(Nid_cell,Ncp);
+
+  lte_dl_cell_spec(output00,
+		   ONE_OVER_SQRT2_Q15,
+		   50,
+		   Nid_cell,
+		   Ncp,
+		   0,
+		   0,
+		   0,
+		   0);
+  
+  lte_dl_cell_spec(output10,
+		   ONE_OVER_SQRT2_Q15,
+		   50,
+		   Nid_cell,
+		   Ncp,
+		   0,
+		   1,
+		   0,
+		   0);
+
+  lte_dl_cell_spec(output01,
+		   ONE_OVER_SQRT2_Q15,
+		   50,
+		   Nid_cell,
+		   Ncp,
+		   0,
+		   0,
+		   1,
+		   0);
+
+  lte_dl_cell_spec(output11,
+		   ONE_OVER_SQRT2_Q15,
+		   50,
+		   Nid_cell,
+		   Ncp,
+		   0,
+		   1,
+		   1,
+		   0);
+  
+
+  write_output("dl_cell_spec00.m","dl_cs00",output00,1024,1,1);
+  write_output("dl_cell_spec01.m","dl_cs01",output01,1024,1,1);
+  write_output("dl_cell_spec10.m","dl_cs10",output10,1024,1,1);  
+  write_output("dl_cell_spec11.m","dl_cs11",output11,1024,1,1);
+}		   
+
+  
+#endif