dlsch_decoding.c 23.8 KB
Newer Older
1
/*******************************************************************************
ghaddab's avatar
ghaddab committed
2 3
    OpenAirInterface 
    Copyright(c) 1999 - 2014 Eurecom
4

ghaddab's avatar
ghaddab committed
5 6 7 8
    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.
9 10


ghaddab's avatar
ghaddab committed
11 12 13 14
    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.
15

ghaddab's avatar
ghaddab committed
16 17 18 19
    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/>.
20 21

  Contact Information
ghaddab's avatar
ghaddab committed
22 23 24 25
  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
27

ghaddab's avatar
ghaddab committed
28
 *******************************************************************************/
29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46

/*! \file PHY/LTE_TRANSPORT/dlsch_decoding.c
* \brief Top-level routines for decoding  Turbo-coded (DLSCH) transport channels from 36-212, V8.6 2009-03
* \author R. Knopp
* \date 2011
* \version 0.1
* \company Eurecom
* \email: knopp@eurecom.fr
* \note
* \warning
*/

//#include "defs.h"
#include "PHY/defs.h"
#include "PHY/extern.h"
#include "PHY/CODING/extern.h"
#include "SCHED/extern.h"
#include "SIMULATION/TOOLS/defs.h"
Raymond Knopp's avatar
 
Raymond Knopp committed
47
//#define DEBUG_DLSCH_DECODING
48 49 50 51 52 53 54 55 56


void free_ue_dlsch(LTE_UE_DLSCH_t *dlsch) {

  int i,r;

  if (dlsch) {
    for (i=0;i<dlsch->Mdlharq;i++) {
      if (dlsch->harq_processes[i]) {
57
	if (dlsch->harq_processes[i]->b) {
58
	  free16(dlsch->harq_processes[i]->b,MAX_DLSCH_PAYLOAD_BYTES);
59 60
	  dlsch->harq_processes[i]->b = NULL;
	}
61
	if (dlsch->harq_processes[i]->c) {
62
	  for (r=0;r<MAX_NUM_DLSCH_SEGMENTS;r++) {
63
	    free16(dlsch->harq_processes[i]->c[r],((r==0)?8:0) + 3+768);
64 65
	    dlsch->harq_processes[i]->c[r] = NULL;
	  }
66 67
	}
	for (r=0;r<MAX_NUM_DLSCH_SEGMENTS;r++)
68
	  if (dlsch->harq_processes[i]->d[r]) {
69
	    free16(dlsch->harq_processes[i]->d[r],((3*8*6144)+12+96)*sizeof(short));
70 71
	    dlsch->harq_processes[i]->d[r] = NULL;
	  }
72
	free16(dlsch->harq_processes[i],sizeof(LTE_DL_UE_HARQ_t));
73
	dlsch->harq_processes[i] = NULL;
74 75 76
      }
    }
  free16(dlsch,sizeof(LTE_UE_DLSCH_t));
77
  dlsch = NULL;
78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103
  }
}

LTE_UE_DLSCH_t *new_ue_dlsch(uint8_t Kmimo,uint8_t Mdlharq,uint8_t max_turbo_iterations,uint8_t N_RB_DL, uint8_t abstraction_flag) {

  LTE_UE_DLSCH_t *dlsch;
  uint8_t exit_flag = 0,i,r;
  
  unsigned char bw_scaling =1;
  
  switch (N_RB_DL){
  case 6: 
    bw_scaling =16;
    break;
  case 25:
    bw_scaling =4;
    break;
  case 50: 
    bw_scaling =2;
    break;
  default:
    bw_scaling =1;
    break;
  }
  dlsch = (LTE_UE_DLSCH_t *)malloc16(sizeof(LTE_UE_DLSCH_t));
  if (dlsch) {
104
    memset(dlsch,0,sizeof(LTE_UE_DLSCH_t));
105 106 107 108 109 110 111 112
    dlsch->Kmimo = Kmimo;
    dlsch->Mdlharq = Mdlharq;
    dlsch->max_turbo_iterations = max_turbo_iterations;

    for (i=0;i<Mdlharq;i++) {
      //      msg("new_ue_dlsch: Harq process %d\n",i);
      dlsch->harq_processes[i] = (LTE_DL_UE_HARQ_t *)malloc16(sizeof(LTE_DL_UE_HARQ_t));
      if (dlsch->harq_processes[i]) {
113
	memset(dlsch->harq_processes[i],0,sizeof(LTE_DL_UE_HARQ_t));
114
	dlsch->harq_processes[i]->first_tx=1;
115
	dlsch->harq_processes[i]->b = (uint8_t*)malloc16(MAX_DLSCH_PAYLOAD_BYTES/bw_scaling);
116 117 118 119
	if (dlsch->harq_processes[i]->b) 
	  memset(dlsch->harq_processes[i]->b,0,MAX_DLSCH_PAYLOAD_BYTES/bw_scaling);
	else
	  exit_flag=3;
120 121
	if (abstraction_flag == 0) {
	  for (r=0;r<MAX_NUM_DLSCH_SEGMENTS/bw_scaling;r++) {
122 123 124 125
	    dlsch->harq_processes[i]->c[r] = (uint8_t*)malloc16(((r==0)?8:0) + 3+ 768);
	    if (dlsch->harq_processes[i]->c[r])
	      memset(dlsch->harq_processes[i]->c[r],0,((r==0)?8:0) + 3+ 768);
	    else
126 127
	      exit_flag=2;
	    dlsch->harq_processes[i]->d[r] = (short*)malloc16(((3*8*6144)+12+96)*sizeof(short));
128 129 130 131
	    if (dlsch->harq_processes[i]->d[r])
	      memset(dlsch->harq_processes[i]->d[r],0,((3*8*6144)+12+96)*sizeof(short));
	    else
	      exit_flag=2;
132 133 134 135 136 137 138 139 140 141
	  }
	}
      }	else {
	exit_flag=1;
      }
    }

    if (exit_flag==0)
      return(dlsch);
  }
142
  msg("new_ue_dlsch with size %zu: exit_flag = %u\n",sizeof(LTE_DL_UE_HARQ_t), exit_flag);
143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164
  free_ue_dlsch(dlsch);

  return(NULL);
}

uint32_t  dlsch_decoding(PHY_VARS_UE *phy_vars_ue,
                         short *dlsch_llr,
                         LTE_DL_FRAME_PARMS *frame_parms,
                         LTE_UE_DLSCH_t *dlsch,
                         LTE_DL_UE_HARQ_t *harq_process,
                         uint8_t subframe,
                         uint8_t harq_pid,
                         uint8_t is_crnti,
			 uint8_t llr8_flag) {
  
  
  time_stats_t *dlsch_rate_unmatching_stats=&phy_vars_ue->dlsch_rate_unmatching_stats;
  time_stats_t *dlsch_turbo_decoding_stats=&phy_vars_ue->dlsch_turbo_decoding_stats;
  time_stats_t *dlsch_deinterleaving_stats=&phy_vars_ue->dlsch_deinterleaving_stats;
  uint32_t A,E;
  uint32_t G;
  uint32_t ret,offset;
165
  uint16_t iind;
166 167 168 169 170
  //  uint8_t dummy_channel_output[(3*8*block_length)+12];
  short dummy_w[MAX_NUM_DLSCH_SEGMENTS][3*(6144+64)];
  uint32_t r,r_offset=0,Kr,Kr_bytes,err_flag=0;
  uint8_t crc_type;
#ifdef DEBUG_DLSCH_DECODING
171
  uint16_t i;
172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238
#endif
  uint8_t (*tc)(int16_t *y,
		uint8_t *,
		uint16_t,			       
		uint16_t,
		uint16_t,
		uint8_t,
		uint8_t,
		uint8_t,
		time_stats_t *,
		time_stats_t *,
		time_stats_t *,
		time_stats_t *,
		time_stats_t *,
		time_stats_t *,
		time_stats_t *);

  if (!dlsch_llr) {
    msg("dlsch_decoding.c: NULL dlsch_llr pointer\n");
    return(dlsch->max_turbo_iterations);
  }

  if (!harq_process) {
      msg("dlsch_decoding.c: NULL harq_process pointer\n");
      return(dlsch->max_turbo_iterations);
  }

  if (!frame_parms) {
      msg("dlsch_decoding.c: NULL frame_parms pointer\n");
      return(dlsch->max_turbo_iterations);
  }
  
  if (subframe>9) {
      msg("dlsch_decoding.c: Illegal subframe index %d\n",subframe);
      return(dlsch->max_turbo_iterations);
  }

  if (llr8_flag == 0)
    tc = phy_threegpplte_turbo_decoder16;
  else
    tc = phy_threegpplte_turbo_decoder8;
  //  nb_rb = dlsch->nb_rb;

  /*
  if (nb_rb > frame_parms->N_RB_DL) {
    msg("dlsch_decoding.c: Illegal nb_rb %d\n",nb_rb);
    return(max_turbo_iterations);
    }*/

  /*harq_pid = dlsch->current_harq_pid;
  if (harq_pid >= 8) {
    msg("dlsch_decoding.c: Illegal harq_pid %d\n",harq_pid);
    return(max_turbo_iterations);
  }
  */
  A = harq_process->TBS; //2072 for QPSK 1/3

  //  mod_order = get_Qm(harq_process->mcs);

  ret = dlsch->max_turbo_iterations;


  G = harq_process->G;
  //get_G(frame_parms,nb_rb,dlsch->rb_alloc,mod_order,num_pdcch_symbols,phy_vars_ue->frame,subframe);

  //  msg("DLSCH Decoding, harq_pid %d Ndi %d\n",harq_pid,harq_process->Ndi);

239
  if (harq_process->round == 0) {
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
    // This is a new packet, so compute quantities regarding segmentation
    harq_process->B = A+24;
    lte_segmentation(NULL,
		     NULL,
		     harq_process->B,
		     &harq_process->C,
		     &harq_process->Cplus,
		     &harq_process->Cminus,
		     &harq_process->Kplus,
		     &harq_process->Kminus,		     
		     &harq_process->F);
    //  CLEAR LLR's HERE for first packet in process
  }
  /*
  else {
    msg("dlsch_decoding.c: Ndi>0 not checked yet!!\n");
    return(max_turbo_iterations);
  }
  */
  err_flag = 0;
  r_offset = 0;
  for (r=0;r<harq_process->C;r++) {

    // Get Turbo interleaver parameters
    if (r<harq_process->Cminus)
      Kr = harq_process->Kminus;
    else
      Kr = harq_process->Kplus;
    Kr_bytes = Kr>>3;
    
    if (Kr_bytes<=64)
      iind = (Kr_bytes-5);
    else if (Kr_bytes <=128)
      iind = 59 + ((Kr_bytes-64)>>1);
    else if (Kr_bytes <= 256)
      iind = 91 + ((Kr_bytes-128)>>2);
    else if (Kr_bytes <= 768)
      iind = 123 + ((Kr_bytes-256)>>3);
    else {
      msg("dlsch_decoding: Illegal codeword size %d!!!\n",Kr_bytes);
280
      return(dlsch->max_turbo_iterations);
281 282 283 284 285 286 287 288 289 290 291 292 293
    }
  
#ifdef DEBUG_DLSCH_DECODING     
    msg("f1 %d, f2 %d, F %d\n",f1f2mat_old[2*iind],f1f2mat_old[1+(2*iind)],(r==0) ? harq_process->F : 0);
#endif

    start_meas(dlsch_rate_unmatching_stats);
    memset(&dummy_w[r][0],0,3*(6144+64)*sizeof(short));
    harq_process->RTC[r] = generate_dummy_w(4+(Kr_bytes*8), 
							       (uint8_t*) &dummy_w[r][0],
							       (r==0) ? harq_process->F : 0);

#ifdef DEBUG_DLSCH_DECODING    
Raymond Knopp's avatar
 
Raymond Knopp committed
294
    LOG_I(PHY,"HARQ_PID %d Rate Matching Segment %d (coded bits %d,unpunctured/repeated bits %d, TBS %d, mod_order %d, nb_rb %d, Nl %d, rv %d, round %d)...\n",
295
	harq_pid,r, G,
296 297 298 299
	Kr*3,
	harq_process->TBS,
	get_Qm(harq_process->mcs),
	harq_process->nb_rb,
Raymond Knopp's avatar
Raymond Knopp committed
300 301 302
	harq_process->Nl,
	harq_process->rvidx,
	harq_process->round);
303 304 305 306 307 308 309
#endif    


    if (lte_rate_matching_turbo_rx(harq_process->RTC[r],
				   G,
				   harq_process->w[r],
				   (uint8_t*)&dummy_w[r][0],
Raymond Knopp's avatar
 
Raymond Knopp committed
310
				   dlsch_llr+r_offset,
311 312 313 314 315
				   harq_process->C,
				   NSOFT,
				   dlsch->Mdlharq,
				   dlsch->Kmimo,
				   harq_process->rvidx,
316
				   (harq_process->round==0)?1:0,
317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414
				   get_Qm(harq_process->mcs),
				   harq_process->Nl,
				   r,
				   &E)==-1) {
      stop_meas(dlsch_rate_unmatching_stats);
      msg("dlsch_decoding.c: Problem in rate_matching\n");
      return(dlsch->max_turbo_iterations);
    }
    else
      stop_meas(dlsch_rate_unmatching_stats);
    r_offset += E;

    /*
    msg("Subblock deinterleaving, d %p w %p\n",
	   harq_process->d[r],
	   harq_process->w);
    */
    start_meas(dlsch_deinterleaving_stats);
    sub_block_deinterleaving_turbo(4+Kr, 
				   &harq_process->d[r][96], 

				   harq_process->w[r]); 
    stop_meas(dlsch_deinterleaving_stats);
    
#ifdef DEBUG_DLSCH_DECODING    
    /*
    if (r==0) {
              write_output("decoder_llr.m","decllr",dlsch_llr,G,1,0);
              write_output("decoder_in.m","dec",&harq_process->d[0][96],(3*8*Kr_bytes)+12,1,0);
    }
    
    msg("decoder input(segment %d) :",r);
    int i; for (i=0;i<(3*8*Kr_bytes)+12;i++)
      msg("%d : %d\n",i,harq_process->d[r][96+i]);
      msg("\n");*/
#endif
    

    //    msg("Clearing c, %p\n",harq_process->c[r]);
    memset(harq_process->c[r],0,Kr_bytes);
    //    msg("done\n");
    if (harq_process->C == 1) 
      crc_type = CRC24_A;
    else 
      crc_type = CRC24_B;

    /*            
    msg("decoder input(segment %d)\n",r);
    for (i=0;i<(3*8*Kr_bytes)+12;i++)
      if ((harq_process->d[r][96+i]>7) || 
	  (harq_process->d[r][96+i] < -8))
	msg("%d : %d\n",i,harq_process->d[r][96+i]);
    msg("\n");
    */

    if (err_flag == 0) {

      start_meas(dlsch_turbo_decoding_stats);      
#ifdef TURBO_S
      ret = phy_threegpplte_turbo_decoder_scalar
#else
	
      ret = tc
#endif
	(&harq_process->d[r][96],
	 harq_process->c[r],
	 Kr,
	 f1f2mat_old[iind*2],   
	 f1f2mat_old[(iind*2)+1], 
	 dlsch->max_turbo_iterations,
	 crc_type,
	 (r==0) ? harq_process->F : 0,
	 &phy_vars_ue->dlsch_tc_init_stats,
	 &phy_vars_ue->dlsch_tc_alpha_stats,
	 &phy_vars_ue->dlsch_tc_beta_stats,
	 &phy_vars_ue->dlsch_tc_gamma_stats,
	 &phy_vars_ue->dlsch_tc_ext_stats,
	 &phy_vars_ue->dlsch_tc_intl1_stats,
	 &phy_vars_ue->dlsch_tc_intl2_stats); //(is_crnti==0)?harq_pid:harq_pid+1);
      

      stop_meas(dlsch_turbo_decoding_stats);            
    }


      
    if ((err_flag == 0) && (ret>=(1+dlsch->max_turbo_iterations))) {// a Code segment is in error so break;
      //msg("CRC failed, segment %d\n",r);
      err_flag = 1;
    }

  }

  if (err_flag == 1) {
    dlsch->harq_ack[subframe].ack = 0;
    dlsch->harq_ack[subframe].harq_id = harq_pid;
    dlsch->harq_ack[subframe].send_harq_status = 1;
    harq_process->round++;
Raymond Knopp's avatar
Raymond Knopp committed
415 416
    //    LOG_D(PHY,"[UE %d] DLSCH: Setting NACK for subframe %d (pid %d, round %d)\n",phy_vars_ue->Mod_id,subframe,harq_pid,harq_process->round);
    //    printf("Rate: [UE %d] DLSCH: Setting NACK for subframe %d (pid %d, round %d)\n",phy_vars_ue->Mod_id,subframe,harq_pid,harq_process->round);
417 418 419 420 421 422 423 424 425 426 427 428
    if (harq_process->round >= dlsch->Mdlharq) {
      harq_process->status = SCH_IDLE;
    }
    
    return((1+dlsch->max_turbo_iterations));
  }
  else {
    harq_process->status = SCH_IDLE;
    harq_process->round  = 0;
    dlsch->harq_ack[subframe].ack = 1;
    dlsch->harq_ack[subframe].harq_id = harq_pid;
    dlsch->harq_ack[subframe].send_harq_status = 1;
Raymond Knopp's avatar
 
Raymond Knopp committed
429 430
    LOG_D(PHY,"[UE %d] DLSCH: Setting ACK for subframe %d (pid %d, round %d)\n",phy_vars_ue->Mod_id,subframe,harq_pid,harq_process->round);

431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476
  }
  // Reassembly of Transport block here
  offset = 0;
  /*  
  msg("harq_pid %d\n",harq_pid);
  msg("F %d, Fbytes %d\n",harq_process->F,harq_process->F>>3);
  msg("C %d\n",harq_process->C);
  */
  for (r=0;r<harq_process->C;r++) {
    if (r<harq_process->Cminus)
      Kr = harq_process->Kminus;
    else
      Kr = harq_process->Kplus;

    Kr_bytes = Kr>>3;
    //    printf("Segment %d : Kr= %d bytes\n",r,Kr_bytes);
    if (r==0) {
      memcpy(harq_process->b,
	     &harq_process->c[0][(harq_process->F>>3)],
	     Kr_bytes - (harq_process->F>>3)- ((harq_process->C>1)?3:0));
      offset = Kr_bytes - (harq_process->F>>3) - ((harq_process->C>1)?3:0);
      //            msg("copied %d bytes to b sequence (harq_pid %d)\n",
      //      	  Kr_bytes - (harq_process->F>>3),harq_pid); 
    //          msg("b[0] = %x,c[%d] = %x\n",
    //  	  harq_process->b[0],
    //  	  harq_process->F>>3,
    //  	  harq_process->c[0][(harq_process->F>>3)]);
    }
    else {
      memcpy(harq_process->b+offset,
	     harq_process->c[r],
	     Kr_bytes- ((harq_process->C>1)?3:0));
      offset += (Kr_bytes - ((harq_process->C>1)?3:0));
    }
  }
  
  return(ret);
}

#ifdef PHY_ABSTRACTION
#include "SIMULATION/TOOLS/defs.h"
#ifdef OPENAIR2
#include "LAYER2/MAC/extern.h"
#include "LAYER2/MAC/defs.h"
#endif

477 478 479
int dlsch_abstraction_EESM(double* sinr_dB, uint8_t TM, uint32_t rb_alloc[4], uint8_t mcs, uint8_t dl_power_off) {
  
  int ii;
480 481 482 483 484 485
  double sinr_eff = 0;
  int rb_count = 0;
  int offset;
  double bler = 0;
  if(TM==5 && dl_power_off==1)
    { //do nothing -- means there is no second UE and TM 5 is behaving like TM 6 for a singal user
486
    }
487
  else
488 489
    TM = TM-1;
  
490 491 492 493 494 495 496 497 498 499 500 501 502
  for (offset = 0; offset <= 24; offset++) {
    if (rb_alloc[0] & (1<<offset)) {
      rb_count++;
      for(ii=0;ii<12;ii++)
	{
	  sinr_eff += exp(-(pow(10, 0.1*(sinr_dB[(offset*12)+ii])))/beta1_dlsch[TM][mcs]);
	  //printf("sinr_eff1 = %f, power %lf\n",sinr_eff, exp(-pow(10,6.8)));
	  
	  //  sinr_eff += exp(-(pow(10, (sinr_dB[offset*2+1])/10))/beta1_dlsch[TM][mcs]);
	  //printf("sinr_dB[%d]=%f\n",offset,sinr_dB[offset*2]);
	}
    }
  }       
503
  LOG_D(OCM,"sinr_eff (lin, unweighted) = %f\n",sinr_eff);
504
  sinr_eff =  -beta2_dlsch[TM][mcs]*log((sinr_eff)/(12*rb_count));
505
  LOG_D(OCM,"sinr_eff (lin, weighted) = %f\n",sinr_eff);
506
  sinr_eff = 10 * log10(sinr_eff);
507
  LOG_D(OCM,"sinr_eff (dB) = %f\n",sinr_eff);
508
  
509
  bler = interp(sinr_eff,&sinr_bler_map[mcs][0][0],&sinr_bler_map[mcs][1][0],table_length[mcs]);
510
  
511
#ifdef USER_MODE // need to be adapted for the emulation in the kernel space 
512 513
  if (uniformrandom() < bler) {
    LOG_I(OCM,"abstraction_decoding failed (mcs=%d, sinr_eff=%f, bler=%f, TM %d)\n",mcs,sinr_eff,bler, TM);
514
    return(1);
515 516
  }
  else {
517
    LOG_I(OCM,"abstraction_decoding successful (mcs=%d, sinr_eff=%f, bler=%f, TM %d)\n",mcs,sinr_eff,bler, TM);
518 519 520 521 522
    return(1);
  }
#endif
}

523 524
int dlsch_abstraction_MIESM(double* sinr_dB,uint8_t TM, uint32_t rb_alloc[4], uint8_t mcs,uint8_t dl_power_off) {
  int ii;
525 526
  double sinr_eff = 0;
  double x = 0;
527
  double I =0;
528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578
  double qpsk_max=12.2;
  double qam16_max=19.2;
  double qam64_max=25.2;
  double sinr_min = -20;
  int rb_count = 0;
  int offset=0;
  double bler = 0;

  if(TM==5 && dl_power_off==1)
    { //do nothing -- means there is no second UE and TM 5 is behaving like TM 6 for a singal user
    }
  else
    TM = TM-1; 
  
  
  for (offset = 0; offset <= 24; offset++) {
    if (rb_alloc[0] & (1<<offset)) {
      rb_count++;
      for(ii=0;ii<12;ii++){
	//x is the sinr_dB in dB
	  x = sinr_dB[(offset*12)+ii] - 10*log10(beta1_dlsch_MI[TM][mcs]);
	  if(x<sinr_min)
	    I +=0;
	  else{
	  if(mcs<10)
	    {
	      if(x>qpsk_max)
		I += 1;
	      else
		I += (q_qpsk[0]*pow(x,7) + q_qpsk[1]*pow(x,6) + q_qpsk[2]*pow(x,5) + q_qpsk[3]*pow(x,4) + q_qpsk[4]*pow(x,3) + q_qpsk[5]*pow(x,2) + q_qpsk[6]*x + q_qpsk[7]);
	    }
	  else if(mcs>9 && mcs<17)
	    {
	      if(x>qam16_max)
		I += 1;
	      else
		I += (q_qam16[0]*pow(x,7) + q_qam16[1]*pow(x,6) + q_qam16[2]*pow(x,5) + q_qam16[3]*pow(x,4) + q_qam16[4]*pow(x,3) + q_qam16[5]*pow(x,2) + q_qam16[6]*x + q_qam16[7]);
	    }
	  else if(mcs>16 && mcs<23)
	    {
	      
	      if(x>qam64_max)
		I += 1;
	      else
		I += (q_qam64[0]*pow(x,7) + q_qam64[1]*pow(x,6) + q_qam64[2]*pow(x,5) + q_qam64[3]*pow(x,4) + q_qam64[4]*pow(x,3) + q_qam64[5]*pow(x,2) + q_qam64[6]*x + q_qam64[7]);
	    }
	  }
      }
    }
  }
  // averaging of accumulated MI 
579 580 581 582 583 584
  I = I/(12*rb_count);  
  //Now  I->SINR_effective Mapping
  
  if(mcs<10)
    {
      sinr_eff = (p_qpsk[0]*pow(I,7) + p_qpsk[1]*pow(I,6) + p_qpsk[2]*pow(I,5) + p_qpsk[3]*pow(I,4) + p_qpsk[4]*pow(I,3) + p_qpsk[5]*pow(I,2) + p_qpsk[6]*I + p_qpsk[7]);
585
    }
586 587 588
  else if(mcs>9 && mcs<17)
    {
      sinr_eff = (p_qam16[0]*pow(I,7) + p_qam16[1]*pow(I,6) + p_qam16[2]*pow(I,5) + p_qam16[3]*pow(I,4) + p_qam16[4]*pow(I,3) + p_qam16[5]*pow(I,2) + p_qam16[6]*I + p_qam16[7]);
589
    }
590 591 592 593 594 595 596 597 598 599
  else if(mcs>16 && mcs<23)
    {
      sinr_eff = (p_qam64[0]*pow(I,7) + p_qam64[1]*pow(I,6) + p_qam64[2]*pow(I,5) + p_qam64[3]*pow(I,4) + p_qam64[4]*pow(I,3) + p_qam64[5]*pow(I,2) + p_qam64[6]*I + p_qam64[7]);
    }	  
  
  //sinr_eff = sinr_eff + 10*log10(beta2_dlsch_MI[TM][mcs]); 
  LOG_D(OCM,"SINR_Eff = %e\n",sinr_eff);
  
  bler = interp(sinr_eff,&sinr_bler_map[mcs][0][0],&sinr_bler_map[mcs][1][0],table_length[mcs]);
  
600
#ifdef USER_MODE // need to be adapted for the emulation in the kernel space 
601
  if (uniformrandom() < bler) {
602
    LOG_N(OCM,"abstraction_decoding failed (mcs=%d, sinr_eff=%f, bler=%f)\n",mcs,sinr_eff,bler);
603 604 605
    return(0);
  }
  else {
606
    LOG_I(OCM,"abstraction_decoding successful (mcs=%d, sinr_eff=%f, bler=%f)\n",mcs,sinr_eff,bler);
607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622
    return(1);
  }
#endif
 }

uint32_t dlsch_decoding_emul(PHY_VARS_UE *phy_vars_ue,
			uint8_t subframe,
			uint8_t dlsch_id,
			uint8_t eNB_id) {

  LTE_UE_DLSCH_t *dlsch_ue;
  LTE_eNB_DLSCH_t *dlsch_eNB;
  uint8_t harq_pid;
  uint32_t eNB_id2;
  uint32_t ue_id;
#ifdef DEBUG_DLSCH_DECODING
623
  uint16_t i;
624
#endif
Raymond Knopp's avatar
 
Raymond Knopp committed
625
  uint8_t CC_id = phy_vars_ue->CC_id;
626

627
  // may not be necessary for PMCH??
628
  for (eNB_id2=0;eNB_id2<NB_eNB_INST;eNB_id2++) {
Raymond Knopp's avatar
 
Raymond Knopp committed
629
    if (PHY_vars_eNB_g[eNB_id2][CC_id]->lte_frame_parms.Nid_cell == phy_vars_ue->lte_frame_parms.Nid_cell)
630 631 632 633
      break;
  }
  if (eNB_id2==NB_eNB_INST) {
    LOG_E(PHY,"FATAL : Could not find attached eNB for DLSCH emulation !!!!\n");
634
    mac_xface->macphy_exit("Could not find attached eNB for DLSCH emulation");
635 636 637 638 639 640 641 642 643 644
  }

  LOG_D(PHY,"[UE] dlsch_decoding_emul : subframe %d, eNB_id %d, dlsch_id %d\n",subframe,eNB_id2,dlsch_id);

  //  printf("dlsch_eNB_ra->harq_processes[0] %p\n",PHY_vars_eNB_g[eNB_id]->dlsch_eNB_ra->harq_processes[0]);


  switch (dlsch_id) {
  case 0: // SI
    dlsch_ue = phy_vars_ue->dlsch_ue_SI[eNB_id];
Raymond Knopp's avatar
 
Raymond Knopp committed
645
    dlsch_eNB = PHY_vars_eNB_g[eNB_id2][CC_id]->dlsch_eNB_SI;
646 647 648 649 650 651 652 653 654 655 656 657
    //    msg("Doing SI: TBS %d\n",dlsch_ue->harq_processes[0]->TBS>>3);
    memcpy(dlsch_ue->harq_processes[0]->b,dlsch_eNB->harq_processes[0]->b,dlsch_ue->harq_processes[0]->TBS>>3);
#ifdef DEBUG_DLSCH_DECODING   
    LOG_D(PHY,"SI Decoded\n");
    for (i=0;i<dlsch_ue->harq_processes[0]->TBS>>3;i++)
      LOG_T(PHY,"%x.",dlsch_eNB->harq_processes[0]->b[i]);
    LOG_T(PHY,"\n");
#endif
    return(1);
    break;
  case 1: // RA
    dlsch_ue  = phy_vars_ue->dlsch_ue_ra[eNB_id];
Raymond Knopp's avatar
 
Raymond Knopp committed
658
    dlsch_eNB = PHY_vars_eNB_g[eNB_id2][CC_id]->dlsch_eNB_ra;
659 660 661 662 663 664 665 666 667 668 669 670
    memcpy(dlsch_ue->harq_processes[0]->b,dlsch_eNB->harq_processes[0]->b,dlsch_ue->harq_processes[0]->TBS>>3);
#ifdef DEBUG_DLSCH_DECODING   
    LOG_D(PHY,"RA Decoded\n");
    for (i=0;i<dlsch_ue->harq_processes[0]->TBS>>3;i++)
      LOG_T(PHY,"%x.",dlsch_eNB->harq_processes[0]->b[i]);
    LOG_T(PHY,"\n");
#endif
    return(1);
    break;
  case 2: // TB0
    dlsch_ue  = phy_vars_ue->dlsch_ue[eNB_id][0];
    harq_pid = dlsch_ue->current_harq_pid;
Raymond Knopp's avatar
 
Raymond Knopp committed
671
    ue_id= (uint32_t)find_ue((int16_t)phy_vars_ue->lte_ue_pdcch_vars[(uint32_t)eNB_id]->crnti,PHY_vars_eNB_g[eNB_id2][CC_id]);
672
    DevAssert( ue_id != (uint32_t)-1 );
Raymond Knopp's avatar
 
Raymond Knopp committed
673
    dlsch_eNB = PHY_vars_eNB_g[eNB_id2][CC_id]->dlsch_eNB[ue_id][0];
674 675 676 677 678 679 680

#ifdef DEBUG_DLSCH_DECODING
    for (i=0;i<dlsch_ue->harq_processes[harq_pid]->TBS>>3;i++)
      LOG_T(PHY,"%x.",dlsch_eNB->harq_processes[harq_pid]->b[i]);
    LOG_T(PHY,"\n current harq pid is %d ue id %d \n", harq_pid, ue_id);
#endif

681 682
    if (dlsch_abstraction_MIESM(phy_vars_ue->sinr_dB, 
				phy_vars_ue->transmission_mode[eNB_id], 
683
				dlsch_eNB->harq_processes[harq_pid]->rb_alloc, 
684
				dlsch_eNB->harq_processes[harq_pid]->mcs,
Raymond Knopp's avatar
 
Raymond Knopp committed
685
				PHY_vars_eNB_g[eNB_id][CC_id]->mu_mimo_mode[ue_id].dl_pow_off) == 1) {
686 687 688 689 690 691
      // reset HARQ 
      dlsch_ue->harq_processes[harq_pid]->status = SCH_IDLE;
      dlsch_ue->harq_processes[harq_pid]->round  = 0;
      dlsch_ue->harq_ack[subframe].ack = 1;
      dlsch_ue->harq_ack[subframe].harq_id = harq_pid;
      dlsch_ue->harq_ack[subframe].send_harq_status = 1;
692
      if (dlsch_ue->harq_processes[harq_pid]->round == 0)
693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708
	memcpy(dlsch_ue->harq_processes[harq_pid]->b,
	       dlsch_eNB->harq_processes[harq_pid]->b,
	       dlsch_ue->harq_processes[harq_pid]->TBS>>3);
      return(1);
    }
    else {
      // retransmission
      dlsch_ue->harq_processes[harq_pid]->status = ACTIVE;
      dlsch_ue->harq_processes[harq_pid]->round++;
      dlsch_ue->harq_ack[subframe].ack = 0;
      dlsch_ue->harq_ack[subframe].harq_id = harq_pid;
      dlsch_ue->harq_ack[subframe].send_harq_status = 1;
      return(1+dlsch_ue->max_turbo_iterations);
      }

    break;
709
  case 3: { // TB1
710 711
    dlsch_ue = phy_vars_ue->dlsch_ue[eNB_id][1];
    harq_pid = dlsch_ue->current_harq_pid;
712 713 714
    int8_t UE_id = find_ue( phy_vars_ue->lte_ue_pdcch_vars[eNB_id]->crnti, PHY_vars_eNB_g[eNB_id2][CC_id] );
    DevAssert( UE_id != -1 );
    dlsch_eNB = PHY_vars_eNB_g[eNB_id2][CC_id]->dlsch_eNB[UE_id][1];
715 716 717 718 719 720
     // reset HARQ 
    dlsch_ue->harq_processes[harq_pid]->status = SCH_IDLE;
    dlsch_ue->harq_processes[harq_pid]->round  = 0;
    dlsch_ue->harq_ack[subframe].ack = 1;
    dlsch_ue->harq_ack[subframe].harq_id = harq_pid;
    dlsch_ue->harq_ack[subframe].send_harq_status = 1;
721
    if (dlsch_ue->harq_processes[harq_pid]->round == 0)
722 723
      memcpy(dlsch_eNB->harq_processes[harq_pid]->b,dlsch_ue->harq_processes[harq_pid]->b,dlsch_ue->harq_processes[harq_pid]->TBS>>3);
    break;
724
  }
725 726 727
  case 5: // PMCH
 
    dlsch_ue  = phy_vars_ue->dlsch_ue_MCH[eNB_id];
Raymond Knopp's avatar
 
Raymond Knopp committed
728
    dlsch_eNB = PHY_vars_eNB_g[eNB_id2][CC_id]->dlsch_eNB_MCH;
729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753

    LOG_D(PHY,"decoding pmch emul (size is %d, enb %d %d)\n",  dlsch_ue->harq_processes[0]->TBS>>3, eNB_id, eNB_id2);
#ifdef DEBUG_DLSCH_DECODING
    for (i=0;i<dlsch_ue->harq_processes[0]->TBS>>3;i++)
      LOG_T(PHY,"%x.",dlsch_eNB->harq_processes[0]->b[i]);
    LOG_T(PHY,"\n");
#endif
    /*
      if (dlsch_abstraction_MIESM(phy_vars_ue->sinr_dB, phy_vars_ue->transmission_mode[eNB_id], dlsch_eNB->rb_alloc, 
				dlsch_eNB->harq_processes[0]->mcs,PHY_vars_eNB_g[eNB_id]->mu_mimo_mode[ue_id].dl_pow_off) == 1) {
    */ 
    if (1) {
      // reset HARQ 
      dlsch_ue->harq_processes[0]->status = SCH_IDLE;
      dlsch_ue->harq_processes[0]->round  = 0;
      memcpy(dlsch_ue->harq_processes[0]->b,
	     dlsch_eNB->harq_processes[0]->b,
	     dlsch_ue->harq_processes[0]->TBS>>3);
      return(1);
    }
    else {
      // retransmission
      return(1+dlsch_ue->max_turbo_iterations);
    }
    break;
754 755 756 757 758 759 760 761 762 763
  default:
    dlsch_ue = phy_vars_ue->dlsch_ue[eNB_id][0];
    LOG_E(PHY,"dlsch_decoding_emul: FATAL, unknown DLSCH_id %d\n",dlsch_id);
    return(1+dlsch_ue->max_turbo_iterations);
  }

  LOG_E(PHY,"[FATAL] dlsch_decoding.c: Should never exit here ...\n");
  return(0);
}
#endif