lte_dl_cell_spec.c 8.37 KB
Newer Older
ghaddab's avatar
ghaddab committed
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25
/*******************************************************************************
    OpenAirInterface 
    Copyright(c) 1999 - 2014 Eurecom

    OpenAirInterface is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.


    OpenAirInterface is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with OpenAirInterface.The full GNU General Public License is 
   included in this distribution in the file called "COPYING". If not, 
   see <http://www.gnu.org/licenses/>.

  Contact Information
  OpenAirInterface Admin: openair_admin@eurecom.fr
  OpenAirInterface Tech : openair_tech@eurecom.fr
  OpenAirInterface Dev  : openair4g-devel@eurecom.fr
  
ghaddab's avatar
ghaddab committed
26
  Address      : Eurecom, Campus SophiaTech, 450 Route des Chappes, CS 50193 - 06904 Biot Sophia Antipolis cedex, FRANCE
ghaddab's avatar
ghaddab committed
27 28

 *******************************************************************************/
29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62
#ifdef USER_MODE
#include <stdio.h>
#include <stdlib.h>
#endif

#include "defs.h"
#include "PHY/defs.h"

//extern unsigned int lte_gold_table[3][20][2][14];
//#define DEBUG_DL_CELL_SPEC



//Calibration
int lte_dl_cell_spec_SS(PHY_VARS_eNB *phy_vars_eNB,
		     mod_sym_t *output,
		     short amp,
		     unsigned char Ns,
		     unsigned char l,//nb of sym per slot 
		     unsigned char p) {//nb of antennas

  unsigned char nu,mprime,mprime_dword,mprime_qpsk_symb,m;
  unsigned short k,a;
  mod_sym_t qpsk[4];

  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;
knopp's avatar
 
knopp committed
63

64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84

  if ((p==0) && (l==0) )
    nu = 0;
  else if ((p==0) && (l>0))
    nu = 3;
  else if ((p==1) && (l==0))
    nu = 3;
  else if ((p==1) && (l>0))
    nu = 0;
  else {
    msg("lte_dl_cell_spec: p %d, l %d -> ERROR\n",p,l);
    return(-1);
  }

  mprime = 110 - phy_vars_eNB->lte_frame_parms.N_RB_DL;
  
  k = (nu + phy_vars_eNB->lte_frame_parms.nushift);
  if (k > 6)//b
    k -=6;//b

  k+=phy_vars_eNB->lte_frame_parms.first_carrier_offset;
knopp's avatar
 
knopp committed
85 86

  for (m=0;m<phy_vars_eNB->lte_frame_parms.N_RB_DL<<1;m++) { // loop over pilots in one slot/symbol, 2*N_RB_DL pilots
87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156

    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_eNB->lte_gold_table[Ns][l][mprime_dword]>>(2*mprime_qpsk_symb))&3];
    //output[k] = (lte_gold_table[eNB_offset][Ns][l][mprime_dword]>>(2*mprime_qpsk_symb))&3;
#ifdef DEBUG_DL_CELL_SPEC
    debug_msg("Ns %d, l %d, m %d,mprime_dword %d, mprime_qpsk_symbol %d\n",
	   Ns,l,m,mprime_dword,mprime_qpsk_symb);
    debug_msg("index = %d (k %d)\n",(phy_vars_eNB->lte_gold_table[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+=6;//b
    if (k >= phy_vars_eNB->lte_frame_parms.ofdm_symbol_size) {
      k++;  // skip DC carrier
      k-=phy_vars_eNB->lte_frame_parms.ofdm_symbol_size;
    }
    //    printf("** k %d\n",k);
  }
  return(0);
}


int lte_dl_cell_spec(PHY_VARS_eNB *phy_vars_eNB,
		     mod_sym_t *output,
		     short amp,
		     unsigned char Ns,
		     unsigned char l,
		     unsigned char p) {

  unsigned char nu,mprime,mprime_dword,mprime_qpsk_symb,m;
  unsigned short k,a;
  mod_sym_t qpsk[4];

  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;

  if ((p==0) && (l==0) )
    nu = 0;
  else if ((p==0) && (l>0))
    nu = 3;
  else if ((p==1) && (l==0))
    nu = 3;
  else if ((p==1) && (l>0))
    nu = 0;
  else {
    msg("lte_dl_cell_spec: p %d, l %d -> ERROR\n",p,l);
    return(-1);
  }

  mprime = 110 - phy_vars_eNB->lte_frame_parms.N_RB_DL;
  
  k = (nu + phy_vars_eNB->lte_frame_parms.nushift);
  if (k > 5)
    k -=6;

  k+=phy_vars_eNB->lte_frame_parms.first_carrier_offset;
knopp's avatar
 
knopp committed
157

158 159 160 161
  DevAssert( Ns < 20 );
  DevAssert( l < 2 );
  DevAssert( mprime>>4 < 14 );

162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185
  for (m=0;m<phy_vars_eNB->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_eNB->lte_gold_table[Ns][l][mprime_dword]>>(2*mprime_qpsk_symb))&3];
    //output[k] = (lte_gold_table[eNB_offset][Ns][l][mprime_dword]>>(2*mprime_qpsk_symb))&3;
#ifdef DEBUG_DL_CELL_SPEC
    msg("Ns %d, l %d, m %d,mprime_dword %d, mprime_qpsk_symbol %d\n",
	   Ns,l,m,mprime_dword,mprime_qpsk_symb);
    msg("index = %d (k %d)\n",(phy_vars_eNB->lte_gold_table[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+=6;
    if (k >= phy_vars_eNB->lte_frame_parms.ofdm_symbol_size) {
      k++;  // skip DC carrier
      k-=phy_vars_eNB->lte_frame_parms.ofdm_symbol_size;
    }
knopp's avatar
 
knopp committed
186

187 188 189 190 191 192
    //    printf("** k %d\n",k);
  }
  return(0);
}

int lte_dl_cell_spec_rx(PHY_VARS_UE *phy_vars_ue,
gauthier's avatar
gauthier committed
193
			uint8_t eNB_offset,
194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316
			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++;
    //    printf("** k %d\n",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