pucch.c 32.7 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

/*! \file PHY/LTE_TRANSPORT/pucch.c
* \brief Top-level routines for generating and decoding the PUCCH physical channel V8.6 2009-03
* \author R. Knopp
* \date 2011
* \version 0.1
* \company Eurecom
* \email: knopp@eurecom.fr
* \note
* \warning
*/
#include "PHY/defs.h"
#include "PHY/extern.h"
#include "LAYER2/MAC/extern.h"

gauthier's avatar
gauthier committed
44
//uint8_t ncs_cell[20][7];
45 46 47
//#define DEBUG_PUCCH_TX
//#define DEBUG_PUCCH_RX

gauthier's avatar
gauthier committed
48
int16_t cfo_pucch_np[24*7] = {20787,-25330,27244,-18205,31356,-9512,32767,0,31356,9511,27244,18204,20787,25329,
49 50 51 52 53 54 55
			  27244,-18205,30272,-12540,32137,-6393,32767,0,32137,6392,30272,12539,27244,18204,
			  31356,-9512,32137,-6393,32609,-3212,32767,0,32609,3211,32137,6392,31356,9511,
			  32767,0,32767,0,32767,0,32767,0,32767,0,32767,0,32767,0,
			  31356,9511,32137,6392,32609,3211,32767,0,32609,-3212,32137,-6393,31356,-9512,
			  27244,18204,30272,12539,32137,6392,32767,0,32137,-6393,30272,-12540,27244,-18205,
			  20787,25329,27244,18204,31356,9511,32767,0,31356,-9512,27244,-18205,20787,-25330};

gauthier's avatar
gauthier committed
56
int16_t cfo_pucch_ep[24*6] = {24278,-22005,29621,-14010,32412,-4808,32412,4807,29621,14009,24278,22004,
57 58 59 60 61 62 63 64
			  28897,-15447,31356,-9512,32609,-3212,32609,3211,31356,9511,28897,15446,
			  31785,-7962,32412,-4808,32727,-1608,32727,1607,32412,4807,31785,7961,
			  32767,0,32767,0,32767,0,32767,0,32767,0,32767,0,
			  31785,7961,32412,4807,32727,1607,32727,-1608,32412,-4808,31785,-7962,
			  28897,15446,31356,9511,32609,3211,32609,-3212,31356,-9512,28897,-15447,
			  24278,22004,29621,14009,32412,4807,32412,-4808,29621,-14010,24278,-22005};


gauthier's avatar
gauthier committed
65
void init_ncs_cell(LTE_DL_FRAME_PARMS *frame_parms,uint8_t ncs_cell[20][7]) {
66

gauthier's avatar
gauthier committed
67 68
  uint8_t ns,l,reset=1,i,N_UL_symb;
  uint32_t x1,x2,j=0,s=0;
69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95
  
  N_UL_symb = (frame_parms->Ncp==0) ? 7 : 6;
  x2 = frame_parms->Nid_cell;

  for (ns=0;ns<20;ns++) {

    for (l=0;l<N_UL_symb;l++) {
      ncs_cell[ns][l]=0;

      for (i=0;i<8;i++) {
	if ((j%32) == 0) {
	  s = lte_gold_generic(&x1,&x2,reset);
	  //	  printf("s %x\n",s);
	  reset=0;
	}
	if (((s>>(j%32))&1)==1)
	  ncs_cell[ns][l] += (1<<i);
	j++;
      }
#ifdef DEBUG_PUCCH_TX
      msg("[PHY] PUCCH ncs_cell init (j %d): Ns %d, l %d => ncs_cell %d\n",j,ns,l,ncs_cell[ns][l]);
#endif
    }

  }
}

gauthier's avatar
gauthier committed
96 97
int16_t alpha_re[12] = {32767, 28377, 16383,     0,-16384,  -28378,-32768,-28378,-16384,    -1, 16383, 28377};
int16_t alpha_im[12] = {0,     16383, 28377, 32767, 28377,   16383,     0,-16384,-28378,-32768,-28378,-16384};
98

gauthier's avatar
gauthier committed
99
int16_t W4[3][4] = {{32767, 32767, 32767, 32767},
100 101
		{32767,-32768, 32767,-32768},
		{32767,-32768,-32768, 32767}};
gauthier's avatar
gauthier committed
102
int16_t W3_re[3][6] = {{32767, 32767, 32767},
103 104 105
		   {32767,-16384,-16384},
		   {32767,-16384,-16384}};

gauthier's avatar
gauthier committed
106
int16_t W3_im[3][6] = {{0    ,0     ,0     },
107 108 109 110 111 112 113
		   {0    , 28377,-28378},
		   {0    ,-28378, 28377}};

char pucch_format_string[6][20] = {"format 1\0","format 1a\0","format 1b\0","format 2\0","format 2a\0","format 2b\0"};

void generate_pucch(mod_sym_t **txdataF,
		    LTE_DL_FRAME_PARMS *frame_parms,
gauthier's avatar
gauthier committed
114
		    uint8_t ncs_cell[20][7],
115 116
		    PUCCH_FMT_t fmt,
		    PUCCH_CONFIG_DEDICATED *pucch_config_dedicated,
gauthier's avatar
gauthier committed
117 118 119 120 121 122
		    uint16_t n1_pucch,
		    uint16_t n2_pucch,
		    uint8_t shortened_format,
		    uint8_t *payload,
		    int16_t amp,
		    uint8_t subframe) {
123
  
gauthier's avatar
gauthier committed
124 125 126 127 128 129 130 131 132 133 134
  uint32_t u,v,n;
  uint32_t z[12*14],*zptr;
  int16_t d0;
  uint8_t ns,N_UL_symb,nsymb,n_oc,n_oc0,n_oc1;
  uint8_t c = (frame_parms->Ncp==0) ? 3 : 2;
  uint16_t nprime,nprime0,nprime1;
  uint16_t i,j,re_offset,thres,h;
  uint8_t Nprime_div_deltaPUCCH_Shift,Nprime,d;
  uint8_t m,l,refs;
  uint8_t n_cs,S,alpha_ind,rem;
  int16_t tmp_re,tmp_im,ref_re,ref_im,W_re=0,W_im=0;
135
  mod_sym_t *txptr;
gauthier's avatar
gauthier committed
136
  uint32_t symbol_offset;
137

gauthier's avatar
gauthier committed
138 139 140
  uint8_t deltaPUCCH_Shift          = frame_parms->pucch_config_common.deltaPUCCH_Shift;
  uint8_t NRB2                      = frame_parms->pucch_config_common.nRB_CQI;
  uint8_t Ncs1_div_deltaPUCCH_Shift = frame_parms->pucch_config_common.nCS_AN;
141

gauthier's avatar
gauthier committed
142 143 144 145
  uint32_t u0 = (frame_parms->Nid_cell + frame_parms->pusch_config_common.ul_ReferenceSignalsPUSCH.grouphop[subframe<<1]) % 30;
  uint32_t u1 = (frame_parms->Nid_cell + frame_parms->pusch_config_common.ul_ReferenceSignalsPUSCH.grouphop[1+(subframe<<1)]) % 30;
  uint32_t v0=frame_parms->pusch_config_common.ul_ReferenceSignalsPUSCH.seqhop[subframe<<1];
  uint32_t v1=frame_parms->pusch_config_common.ul_ReferenceSignalsPUSCH.seqhop[1+(subframe<<1)];
146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212
  
  if ((deltaPUCCH_Shift==0) || (deltaPUCCH_Shift>3)) {
    msg("[PHY] generate_pucch: Illegal deltaPUCCH_shift %d (should be 1,2,3)\n",deltaPUCCH_Shift);
    return;
  }

  if (Ncs1_div_deltaPUCCH_Shift > 7) {
    msg("[PHY] generate_pucch: Illegal Ncs1_div_deltaPUCCH_Shift %d (should be 0...7)\n",Ncs1_div_deltaPUCCH_Shift);
    return;
  }

  zptr = z;
  thres = (c*Ncs1_div_deltaPUCCH_Shift);
  Nprime_div_deltaPUCCH_Shift = (n1_pucch < thres) ? Ncs1_div_deltaPUCCH_Shift : (12/deltaPUCCH_Shift);
  Nprime = Nprime_div_deltaPUCCH_Shift * deltaPUCCH_Shift;

#ifdef DEBUG_PUCCH_TX
  msg("[PHY] PUCCH: cNcs1/deltaPUCCH_Shift %d, Nprime %d, n1_pucch %d\n",thres,Nprime,n1_pucch);
#endif

  N_UL_symb = (frame_parms->Ncp==0) ? 7 : 6;

  if (n1_pucch < thres)
    nprime0=n1_pucch;
  else
    nprime0 = (n1_pucch - thres)%(12*c/deltaPUCCH_Shift); 
  
  if (n1_pucch >= thres)
    nprime1= ((c*(nprime0+1))%((12*c/deltaPUCCH_Shift)+1))-1;
  else {
    d = (frame_parms->Ncp==0) ? 2 : 0;
    h= (nprime0+d)%(c*Nprime_div_deltaPUCCH_Shift);
    nprime1 = (h/c) + (h%c)*Nprime_div_deltaPUCCH_Shift; 
  }

#ifdef DEBUG_PUCCH_TX
  msg("[PHY] PUCCH: nprime0 %d nprime1 %d, %s, payload (%d,%d)\n",nprime0,nprime1,pucch_format_string[fmt],payload[0],payload[1]);
#endif

  n_oc0 = nprime0/Nprime_div_deltaPUCCH_Shift;
  if (frame_parms->Ncp==1)
    n_oc0<<=1;

  n_oc1 = nprime1/Nprime_div_deltaPUCCH_Shift;
  if (frame_parms->Ncp==1)  // extended CP
    n_oc1<<=1;

#ifdef DEBUG_PUCCH_TX
  msg("[PHY] PUCCH: noc0 %d noc11 %d\n",n_oc0,n_oc1);
#endif

  nprime=nprime0;
  n_oc  =n_oc0;

  // loop over 2 slots
  for (ns=(subframe<<1),u=u0,v=v0;ns<(2+(subframe<<1));ns++,u=u1,v=v1) {

    if ((nprime&1) == 0)
      S=0;  // 1
    else
      S=1;  // j

    //loop over symbols in slot
    for (l=0;l<N_UL_symb;l++) {
      // Compute n_cs (36.211 p. 18)
      n_cs = ncs_cell[ns][l];
      if (frame_parms->Ncp==0) { // normal CP
gauthier's avatar
gauthier committed
213
	n_cs = ((uint16_t)n_cs + (nprime*deltaPUCCH_Shift + (n_oc%deltaPUCCH_Shift))%Nprime)%12;
214 215
      }
      else {
gauthier's avatar
gauthier committed
216
	n_cs = ((uint16_t)n_cs + (nprime*deltaPUCCH_Shift + (n_oc>>1))%Nprime)%12;	
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
      }


      refs=0;
      // Comput W_noc(m) (36.211 p. 19)
      if ((ns==(1+(subframe<<1))) && (shortened_format==1)) {  // second slot and shortened format

	if (l<2) {                                         // data
	  W_re=W3_re[n_oc][l];
	  W_im=W3_im[n_oc][l];
	}
	else if ((l<N_UL_symb-2)&&(frame_parms->Ncp==0)) { // reference and normal CP 
	  W_re=W3_re[n_oc][l-2];
	  W_im=W3_im[n_oc][l-2];
	  refs=1;
	}
	else if ((l<N_UL_symb-2)&&(frame_parms->Ncp==1)) {  // reference and extended CP 
	  W_re=W4[n_oc][l-2];                          
	  W_im=0;
	  refs=1;
	}     
	else if ((l>=N_UL_symb-2)) {                        // data
	  W_re=W3_re[n_oc][l-N_UL_symb+4];
	  W_im=W3_im[n_oc][l-N_UL_symb+4];
	}
      }
      else {
	if (l<2) {                                         // data
	  W_re=W4[n_oc][l];
	  W_im=0;
	}
	else if ((l<N_UL_symb-2)&&(frame_parms->Ncp==0)) { // reference and normal CP 
	  W_re=W3_re[n_oc][l-2];
	  W_im=W3_im[n_oc][l-2];
	  refs=1;
	}
	else if ((l<N_UL_symb-2)&&(frame_parms->Ncp==1)) { // reference and extended CP 
	  W_re=W4[n_oc][l-2];
	  W_im=0;
	  refs=1;
	}
	else if ((l>=N_UL_symb-2)) {                       // data
	  W_re=W4[n_oc][l-N_UL_symb+4];
	  W_im=0;
	}
      }

      // multiply W by S(ns) (36.211 p.17). only for data, reference symbols do not have this factor  
      if ((S==1)&&(refs==0)) {
	tmp_re = W_re;
	W_re = -W_im;
	W_im = tmp_re;
      }

#ifdef DEBUG_PUCCH_TX
      msg("[PHY] PUCCH: ncs[%d][%d]=%d, W_re %d, W_im %d, S %d, refs %d\n",ns,l,n_cs,W_re,W_im,S,refs);
#endif
      alpha_ind=0;
	// compute output sequence

      for (n=0;n<12;n++) {

	// this is r_uv^alpha(n)
gauthier's avatar
gauthier committed
280 281
	tmp_re = (int16_t)(((int32_t)alpha_re[alpha_ind] * ul_ref_sigs[u][v][0][n<<1] - (int32_t)alpha_im[alpha_ind] * ul_ref_sigs[u][v][0][1+(n<<1)])>>15);
	tmp_im = (int16_t)(((int32_t)alpha_re[alpha_ind] * ul_ref_sigs[u][v][0][1+(n<<1)] + (int32_t)alpha_im[alpha_ind] * ul_ref_sigs[u][v][0][n<<1])>>15);
282 283 284 285 286 287 288 289 290

	// this is S(ns)*w_noc(m)*r_uv^alpha(n)
	ref_re = (tmp_re*W_re - tmp_im*W_im)>>15;
	ref_im = (tmp_re*W_im + tmp_im*W_re)>>15;

	if ((l<2)||(l>=(N_UL_symb-2))) { //these are PUCCH data symbols
	  switch (fmt) {
	  case pucch_format1:   //OOK 1-bit
	    
gauthier's avatar
gauthier committed
291 292
	    ((int16_t *)&zptr[n])[0] = ((int32_t)amp*ref_re)>>15;
	    ((int16_t *)&zptr[n])[1] = ((int32_t)amp*ref_im)>>15;
293 294 295 296 297
	    
	    break;
	    
	  case pucch_format1a:  //BPSK 1-bit
	    d0 = (payload[0]&1)==0 ? amp : -amp;
gauthier's avatar
gauthier committed
298 299
	    ((int16_t *)&zptr[n])[0] = ((int32_t)d0*ref_re)>>15;
	    ((int16_t *)&zptr[n])[1] = ((int32_t)d0*ref_im)>>15;
300 301 302 303 304
	    //	    printf("d0 %d\n",d0);
	    break;
	    
	  case pucch_format1b:  //QPSK 2-bits (Table 5.4.1-1 from 36.211, pg. 18)
	    if (((payload[0]&1)==0) && ((payload[1]&1)==0))  {// 1
gauthier's avatar
gauthier committed
305 306
	      ((int16_t *)&zptr[n])[0] = ((int32_t)amp*ref_re)>>15;
	      ((int16_t *)&zptr[n])[1] = ((int32_t)amp*ref_im)>>15;
307 308
	    }
	    else if (((payload[0]&1)==0) && ((payload[1]&1)==1))  {// -j
gauthier's avatar
gauthier committed
309 310
	      ((int16_t *)&zptr[n])[0] = ((int32_t)amp*ref_im)>>15;
	      ((int16_t *)&zptr[n])[1] = (-(int32_t)amp*ref_re)>>15;
311 312
	    }
	    else if (((payload[0]&1)==1) && ((payload[1]&1)==0))  {// j
gauthier's avatar
gauthier committed
313 314
	      ((int16_t *)&zptr[n])[0] = (-(int32_t)amp*ref_im)>>15;
	      ((int16_t *)&zptr[n])[1] = ((int32_t)amp*ref_re)>>15;
315 316
	    }
	    else  {// -1
gauthier's avatar
gauthier committed
317 318
	      ((int16_t *)&zptr[n])[0] = (-(int32_t)amp*ref_re)>>15;
	      ((int16_t *)&zptr[n])[1] = (-(int32_t)amp*ref_im)>>15;
319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336
	    }
	    break;
	    
	  case pucch_format2:
	    msg("[PHY] PUCCH format 2 not implemented\n");
	    break;
	    
	  case pucch_format2a:
	    msg("[PHY] PUCCH format 2a not implemented\n");
	    break;
	    
	  case pucch_format2b:
	    msg("[PHY] PUCCH format 2b not implemented\n");
	    break;
	  } // switch fmt
	}
	else {   // These are PUCCH reference symbols

gauthier's avatar
gauthier committed
337 338
	  ((int16_t *)&zptr[n])[0] = ((int32_t)amp*ref_re)>>15;
	  ((int16_t *)&zptr[n])[1] = ((int32_t)amp*ref_im)>>15;
339 340 341
	  //	  printf("ref\n");
	}
#ifdef DEBUG_PUCCH_TX
gauthier's avatar
gauthier committed
342
	msg("[PHY] PUCCH subframe %d z(%d,%d) => %d,%d, alpha(%d) => %d,%d\n",subframe,l,n,((int16_t *)&zptr[n])[0],((int16_t *)&zptr[n])[1],
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
	    alpha_ind,alpha_re[alpha_ind],alpha_im[alpha_ind]);
#endif
	alpha_ind = (alpha_ind + n_cs)%12;
      } // n
      zptr+=12;
    } // l

  nprime=nprime1;
  n_oc  =n_oc1;
  } // ns

  rem = ((((12*Ncs1_div_deltaPUCCH_Shift)>>3)&7)>0) ? 1 : 0;

  m = (n1_pucch < thres) ? NRB2 : (((n1_pucch-thres)/(12*c/deltaPUCCH_Shift))+NRB2+((deltaPUCCH_Shift*Ncs1_div_deltaPUCCH_Shift)>>3)+rem);

#ifdef DEBUG_PUCCH_TX
  msg("[PHY] PUCCH: m %d\n",m);
#endif
  nsymb = N_UL_symb<<1;

  //for (j=0,l=0;l<(nsymb-1);l++) {
  for (j=0,l=0;l<(nsymb);l++) {

    if ((l<(nsymb>>1)) && ((m&1) == 0))
      re_offset = (m*6) + frame_parms->first_carrier_offset;
    else if ((l<(nsymb>>1)) && ((m&1) == 1))
      re_offset = frame_parms->first_carrier_offset + (frame_parms->N_RB_DL - (m>>1) - 1)*12;
    else if ((m&1) == 0)
      re_offset = frame_parms->first_carrier_offset + (frame_parms->N_RB_DL - (m>>1) - 1)*12;
    else
      re_offset = ((m-1)*6) + frame_parms->first_carrier_offset;

    if (re_offset > frame_parms->ofdm_symbol_size)
      re_offset -= (frame_parms->ofdm_symbol_size);

    symbol_offset = (unsigned int)frame_parms->ofdm_symbol_size*(l+(subframe*nsymb));
    txptr = &txdataF[0][symbol_offset];

    for (i=0;i<12;i++,j++) {
      txptr[re_offset++] = z[j];
      if (re_offset==frame_parms->ofdm_symbol_size)
	re_offset = 0; 
#ifdef DEBUG_PUCCH_TX
gauthier's avatar
gauthier committed
386
      msg("[PHY] PUCCH subframe %d (%d,%d,%d,%d) => %d,%d\n",subframe,l,i,re_offset-1,m,((int16_t *)&z[j])[0],((int16_t *)&z[j])[1]);
387 388 389 390 391 392 393 394
#endif
    }
  }

}

void generate_pucch_emul(PHY_VARS_UE *phy_vars_ue,
			 PUCCH_FMT_t format,
gauthier's avatar
gauthier committed
395 396 397 398
			 uint8_t ncs1,
			 uint8_t *pucch_payload,
			 uint8_t sr,
			 uint8_t subframe) {
399

knopp's avatar
 
knopp committed
400 401
  UE_transport_info[phy_vars_ue->Mod_id][phy_vars_ue->CC_id].cntl.pucch_flag    = format;
  UE_transport_info[phy_vars_ue->Mod_id][phy_vars_ue->CC_id].cntl.pucch_Ncs1    = ncs1;
402 403


knopp's avatar
 
knopp committed
404
  UE_transport_info[phy_vars_ue->Mod_id][phy_vars_ue->CC_id].cntl.sr            = sr;
405
  // the value of phy_vars_ue->pucch_sel[subframe] is set by get_n1_pucch
knopp's avatar
 
knopp committed
406
  UE_transport_info[phy_vars_ue->Mod_id][phy_vars_ue->CC_id].cntl.pucch_sel      = phy_vars_ue->pucch_sel[subframe];
407 408 409 410 411 412
  
  // LOG_I(PHY,"subframe %d emu tx pucch_sel is %d sr is %d \n", subframe, UE_transport_info[phy_vars_ue->Mod_id].cntl.pucch_sel, sr);
  
  if (format == pucch_format1a) {
    
    phy_vars_ue->pucch_payload[0] = pucch_payload[0];
knopp's avatar
 
knopp committed
413
    UE_transport_info[phy_vars_ue->Mod_id][phy_vars_ue->CC_id].cntl.pucch_payload = pucch_payload[0];
414 415 416
  }
  else if (format == pucch_format1b) {
    phy_vars_ue->pucch_payload[0] = pucch_payload[0] + (pucch_payload[1]<<1);
knopp's avatar
 
knopp committed
417
    UE_transport_info[phy_vars_ue->Mod_id][phy_vars_ue->CC_id].cntl.pucch_payload = pucch_payload[0] + (pucch_payload[1]<<1);
418 419
  }
  else if (format == pucch_format1) {
knopp's avatar
 
knopp committed
420
    LOG_D(PHY,"[UE %d] Frame %d subframe %d Generating PUCCH for SR %d\n",phy_vars_ue->Mod_id,phy_vars_ue->frame_tx,subframe,sr);
421 422 423 424 425
  }
  phy_vars_ue->sr[subframe] = sr; 

}

gauthier's avatar
gauthier committed
426
int32_t rx_pucch(PHY_VARS_eNB *phy_vars_eNB,
427
	     PUCCH_FMT_t fmt,
gauthier's avatar
gauthier committed
428 429 430 431 432 433 434
	     uint8_t UE_id,
	     uint16_t n1_pucch,
	     uint16_t n2_pucch,
	     uint8_t shortened_format,
	     uint8_t *payload,
	     uint8_t subframe,
	     uint8_t pucch1_thres) {
435 436 437 438 439


  LTE_eNB_COMMON *eNB_common_vars                = &phy_vars_eNB->lte_eNB_common_vars;
  LTE_DL_FRAME_PARMS *frame_parms                = &phy_vars_eNB->lte_frame_parms;
  //  PUCCH_CONFIG_DEDICATED *pucch_config_dedicated = &phy_vars_eNB->pucch_config_dedicated[UE_id];
gauthier's avatar
gauthier committed
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
  int8_t sigma2_dB                                   = phy_vars_eNB->PHY_measurements_eNB[0].n0_power_tot_dB;
  uint32_t u,v,n,aa;
  uint32_t z[12*14];
  int16_t *zptr;
  int16_t rxcomp[NB_ANTENNAS_RX][2*12*14];
  uint8_t ns,N_UL_symb,nsymb,n_oc,n_oc0,n_oc1;
  uint8_t c = (frame_parms->Ncp==0) ? 3 : 2;
  uint16_t nprime,nprime0,nprime1;
  uint16_t i,j,re_offset,thres,h,off;
  uint8_t Nprime_div_deltaPUCCH_Shift,Nprime,d;
  uint8_t m,l,refs,phase,re,l2,phase_max=0;
  uint8_t n_cs,S,alpha_ind,rem;
  int16_t tmp_re,tmp_im,W_re=0,W_im=0;
  int16_t *rxptr;
  uint32_t symbol_offset;
  int16_t stat_ref_re,stat_ref_im,*cfo,chest_re,chest_im;
  int32_t stat_re=0,stat_im=0;
  int32_t stat,stat_max=0;

  uint8_t deltaPUCCH_Shift          = frame_parms->pucch_config_common.deltaPUCCH_Shift;
  uint8_t NRB2                      = frame_parms->pucch_config_common.nRB_CQI;
  uint8_t Ncs1_div_deltaPUCCH_Shift = frame_parms->pucch_config_common.nCS_AN;

  uint32_t u0 = (frame_parms->Nid_cell + frame_parms->pusch_config_common.ul_ReferenceSignalsPUSCH.grouphop[subframe<<1]) % 30;
  uint32_t u1 = (frame_parms->Nid_cell + frame_parms->pusch_config_common.ul_ReferenceSignalsPUSCH.grouphop[1+(subframe<<1)]) % 30;
  uint32_t v0=frame_parms->pusch_config_common.ul_ReferenceSignalsPUSCH.seqhop[subframe<<1];
  uint32_t v1=frame_parms->pusch_config_common.ul_ReferenceSignalsPUSCH.seqhop[1+(subframe<<1)];
467 468 469 470 471 472 473 474 475 476 477 478


  if ((deltaPUCCH_Shift==0) || (deltaPUCCH_Shift>3)) {
    LOG_E(PHY,"[eNB] rx_pucch: Illegal deltaPUCCH_shift %d (should be 1,2,3)\n",deltaPUCCH_Shift);
    return(-1);
  }

  if (Ncs1_div_deltaPUCCH_Shift > 7) {
    LOG_E(PHY,"[eNB] rx_pucch: Illegal Ncs1_div_deltaPUCCH_Shift %d (should be 0...7)\n",Ncs1_div_deltaPUCCH_Shift);
    return(-1);
  }

gauthier's avatar
gauthier committed
479
  zptr = (int16_t *)z;
480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534
  thres = (c*Ncs1_div_deltaPUCCH_Shift);
  Nprime_div_deltaPUCCH_Shift = (n1_pucch < thres) ? Ncs1_div_deltaPUCCH_Shift : (12/deltaPUCCH_Shift);
  Nprime = Nprime_div_deltaPUCCH_Shift * deltaPUCCH_Shift;

#ifdef DEBUG_PUCCH_RX
  LOG_D(PHY,"[eNB] PUCCH: cNcs1/deltaPUCCH_Shift %d, Nprime %d, n1_pucch %d\n",thres,Nprime,n1_pucch);
#endif

  N_UL_symb = (frame_parms->Ncp==0) ? 7 : 6;

  if (n1_pucch < thres)
    nprime0=n1_pucch;
  else
    nprime0 = (n1_pucch - thres)%(12*c/deltaPUCCH_Shift); 
  
  if (n1_pucch >= thres)
    nprime1= ((c*(nprime0+1))%((12*c/deltaPUCCH_Shift)+1))-1;
  else {
    d = (frame_parms->Ncp==0) ? 2 : 0;
    h= (nprime0+d)%(c*Nprime_div_deltaPUCCH_Shift);
    nprime1 = (h/c) + (h%c)*Nprime_div_deltaPUCCH_Shift; 
  }

#ifdef DEBUG_PUCCH_RX
  LOG_D(PHY,"PUCCH: nprime0 %d nprime1 %d\n",nprime0,nprime1);
#endif

  n_oc0 = nprime0/Nprime_div_deltaPUCCH_Shift;
  if (frame_parms->Ncp==1)
    n_oc0<<=1;

  n_oc1 = nprime1/Nprime_div_deltaPUCCH_Shift;
  if (frame_parms->Ncp==1)  // extended CP
    n_oc1<<=1;

#ifdef DEBUG_PUCCH_RX
  LOG_D(PHY,"[eNB] PUCCH: noc0 %d noc11 %d\n",n_oc0,n_oc1);
#endif

  nprime=nprime0;
  n_oc  =n_oc0;

  // loop over 2 slots
  for (ns=(subframe<<1),u=u0,v=v0;ns<(2+(subframe<<1));ns++,u=u1,v=v1) {

    if ((nprime&1) == 0)
      S=0;  // 1
    else
      S=1;  // j

    //loop over symbols in slot
    for (l=0;l<N_UL_symb;l++) {
      // Compute n_cs (36.211 p. 18)
      n_cs = phy_vars_eNB->ncs_cell[ns][l];
      if (frame_parms->Ncp==0) { // normal CP
gauthier's avatar
gauthier committed
535
	n_cs = ((uint16_t)n_cs + (nprime*deltaPUCCH_Shift + (n_oc%deltaPUCCH_Shift))%Nprime)%12;
536 537
      }
      else {
gauthier's avatar
gauthier committed
538
	n_cs = ((uint16_t)n_cs + (nprime*deltaPUCCH_Shift + (n_oc>>1))%Nprime)%12;	
539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601
      }


      refs=0;
      // Comput W_noc(m) (36.211 p. 19)
      if ((ns==(1+(subframe<<1))) && (shortened_format==1)) {  // second slot and shortened format

	if (l<2) {                                         // data
	  W_re=W3_re[n_oc][l];
	  W_im=W3_im[n_oc][l];
	}
	else if ((l<N_UL_symb-2)&&(frame_parms->Ncp==0)) { // reference and normal CP 
	  W_re=W3_re[n_oc][l-2];
	  W_im=W3_im[n_oc][l-2];
	  refs=1;
	}
	else if ((l<N_UL_symb-2)&&(frame_parms->Ncp==1)) {  // reference and extended CP 
	  W_re=W4[n_oc][l-2];                          
	  W_im=0;
	  refs=1;
	}     
	else if ((l>=N_UL_symb-2)) {                        // data
	  W_re=W3_re[n_oc][l-N_UL_symb+4];
	  W_im=W3_im[n_oc][l-N_UL_symb+4];
	}
      }
      else {
	if (l<2) {                                         // data
	  W_re=W4[n_oc][l];
	  W_im=0;
	}
	else if ((l<N_UL_symb-2)&&(frame_parms->Ncp==0)) { // reference and normal CP 
	  W_re=W3_re[n_oc][l-2];
	  W_im=W3_im[n_oc][l-2];
	  refs=1;
	}
	else if ((l<N_UL_symb-2)&&(frame_parms->Ncp==1)) { // reference and extended CP 
	  W_re=W4[n_oc][l-2];
	  W_im=0;
	  refs=1;
	}
	else if ((l>=N_UL_symb-2)) {                       // data
	  W_re=W4[n_oc][l-N_UL_symb+4];
	  W_im=0;
	}
      }

      // multiply W by S(ns) (36.211 p.17). only for data, reference symbols do not have this factor  
      if ((S==1)&&(refs==0)) {
	tmp_re = W_re;
	W_re = -W_im;
	W_im = tmp_re;
      }

#ifdef DEBUG_PUCCH_RX
      LOG_D(PHY,"[eNB] PUCCH: ncs[%d][%d]=%d, W_re %d, W_im %d, S %d, refs %d\n",ns,l,n_cs,W_re,W_im,S,refs);
#endif
      alpha_ind=0;
	// compute output sequence

      for (n=0;n<12;n++) {

	// this is r_uv^alpha(n)
gauthier's avatar
gauthier committed
602 603
	tmp_re = (int16_t)(((int32_t)alpha_re[alpha_ind] * ul_ref_sigs[u][v][0][n<<1] - (int32_t)alpha_im[alpha_ind] * ul_ref_sigs[u][v][0][1+(n<<1)])>>15);
	tmp_im = (int16_t)(((int32_t)alpha_re[alpha_ind] * ul_ref_sigs[u][v][0][1+(n<<1)] + (int32_t)alpha_im[alpha_ind] * ul_ref_sigs[u][v][0][n<<1])>>15);
604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630

	// this is S(ns)*w_noc(m)*r_uv^alpha(n)
	zptr[n<<1] = (tmp_re*W_re - tmp_im*W_im)>>15;
	zptr[1+(n<<1)] = -(tmp_re*W_im + tmp_im*W_re)>>15;

#ifdef DEBUG_PUCCH_RX
	LOG_D(PHY,"[eNB] PUCCH subframe %d z(%d,%d) => %d,%d, alpha(%d) => %d,%d\n",subframe,l,n,zptr[n<<1],zptr[(n<<1)+1],
	    alpha_ind,alpha_re[alpha_ind],alpha_im[alpha_ind]);
#endif
	alpha_ind = (alpha_ind + n_cs)%12;
      } // n
      zptr+=24;
    } // l

  nprime=nprime1;
  n_oc  =n_oc1;
  } // ns

  rem = ((((deltaPUCCH_Shift*Ncs1_div_deltaPUCCH_Shift)>>3)&7)>0) ? 1 : 0;

  m = (n1_pucch < thres) ? NRB2 : (((n1_pucch-thres)/(12*c/deltaPUCCH_Shift))+NRB2+((deltaPUCCH_Shift*Ncs1_div_deltaPUCCH_Shift)>>3)+rem);

#ifdef DEBUG_PUCCH_RX
  LOG_D(PHY,"[eNB] PUCCH: m %d\n",m);
#endif
  nsymb = N_UL_symb<<1;

gauthier's avatar
gauthier committed
631
  zptr = (int16_t*)z;
632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650

  // Do detection
  for (aa=0;aa<frame_parms->nb_antennas_rx;aa++) {
    
    //for (j=0,l=0;l<(nsymb-1);l++) {
    for (j=0,l=0;l<nsymb;l++) {
      if ((l<(nsymb>>1)) && ((m&1) == 0))
	re_offset = (m*6) + frame_parms->first_carrier_offset;
      else if ((l<(nsymb>>1)) && ((m&1) == 1))
	re_offset = frame_parms->first_carrier_offset + (frame_parms->N_RB_DL - (m>>1) - 1)*12;
      else if ((m&1) == 0)
	re_offset = frame_parms->first_carrier_offset + (frame_parms->N_RB_DL - (m>>1) - 1)*12;
      else
	re_offset = ((m-1)*6) + frame_parms->first_carrier_offset;
      
      if (re_offset > frame_parms->ofdm_symbol_size)
	re_offset -= (frame_parms->ofdm_symbol_size);
      
      symbol_offset = (unsigned int)frame_parms->ofdm_symbol_size*l;
gauthier's avatar
gauthier committed
651
      rxptr = (int16_t *)&eNB_common_vars->rxdataF[0][aa][symbol_offset];
652
      for (i=0;i<12;i++,j+=2,re_offset++) {
gauthier's avatar
gauthier committed
653 654
	rxcomp[aa][j]   = (int16_t)((rxptr[re_offset<<2]*(int32_t)zptr[j])>>15)   - ((rxptr[1+(re_offset<<2)]*(int32_t)zptr[1+j])>>15);
	rxcomp[aa][1+j] = (int16_t)((rxptr[re_offset<<2]*(int32_t)zptr[1+j])>>15) + ((rxptr[1+(re_offset<<2)]*(int32_t)zptr[j])>>15);
655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688
	if (re_offset==frame_parms->ofdm_symbol_size)
	  re_offset = 0; 
#ifdef DEBUG_PUCCH_RX
	LOG_D(PHY,"[eNB] PUCCH subframe %d (%d,%d,%d,%d,%d) => (%d,%d) x (%d,%d) : (%d,%d)\n",subframe,l,i,re_offset,m,j,
	    rxptr[re_offset<<2],rxptr[1+(re_offset<<2)],
	    zptr[j],zptr[1+j],
	    rxcomp[aa][j],rxcomp[aa][1+j]);
#endif
      } //re
    } // symbol
  }  // antenna


  // PUCCH Format 1
  // Do cfo correction and MRC across symbols

  if (fmt == pucch_format1) {
#ifdef DEBUG_PUCCH_RX
    LOG_D(PHY,"Doing PUCCH detection for format 1\n");
#endif

    stat_max = 0;
    
    
    for (phase=0;phase<7;phase++) {
      stat=0;
      for (aa=0;aa<frame_parms->nb_antennas_rx;aa++) {
	for (re=0;re<12;re++) {
	  stat_re=0;
	  stat_im=0;
	  off=re<<1;
	  cfo =  (frame_parms->Ncp==0) ? &cfo_pucch_np[14*phase] : &cfo_pucch_ep[12*phase];
	  
	  for (l=0;l<(nsymb>>1);l++) {
gauthier's avatar
gauthier committed
689 690
	    stat_re += ((rxcomp[aa][off]*(int32_t)cfo[l<<1])>>15)     - ((rxcomp[aa][1+off]*(int32_t)cfo[1+(l<<1)])>>15);
	    stat_im += ((rxcomp[aa][off]*(int32_t)cfo[1+(l<<1)])>>15) + ((rxcomp[aa][1+off]*(int32_t)cfo[(l<<1)])>>15);
691 692 693 694 695 696 697 698 699
	    off+=2;
#ifdef DEBUG_PUCCH_RX
	    LOG_D(PHY,"[eNB] PUCCH subframe %d (%d,%d) => (%d,%d) x (%d,%d) : (%d,%d)\n",subframe,l,re,
		rxcomp[aa][off],rxcomp[aa][1+off],
		cfo[l<<1],cfo[1+(l<<1)],
		stat_re,stat_im);
#endif	    
	  }
	  for (l2=0,l=(nsymb>>1);l<(nsymb-1);l++,l2++) {
gauthier's avatar
gauthier committed
700 701
	    stat_re += ((rxcomp[aa][off]*(int32_t)cfo[l2<<1])>>15)     - ((rxcomp[aa][1+off]*(int32_t)cfo[1+(l2<<1)])>>15);
	    stat_im += ((rxcomp[aa][off]*(int32_t)cfo[1+(l2<<1)])>>15) + ((rxcomp[aa][1+off]*(int32_t)cfo[(l2<<1)])>>15);
702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751
	    off+=2;
#ifdef DEBUG_PUCCH_RX
	    LOG_D(PHY,"[eNB] PUCCH subframe %d (%d,%d) => (%d,%d) x (%d,%d) : (%d,%d)\n",subframe,l2,re,
		rxcomp[aa][off],rxcomp[aa][1+off],
		cfo[l2<<1],cfo[1+(l2<<1)],
		stat_re,stat_im);
#endif	    
	    
	  }
	} //re 
      } // aa

      stat = (stat_re*stat_re) + (stat_im*stat_im);
      
      if (stat>stat_max) {
	stat_max = stat;
	phase_max = phase;
      }
#ifdef DEBUG_PUCCH_RX
      LOG_D(PHY,"[eNB] PUCCH: stat %d, stat_max %d, phase_max %d\n", stat,stat_max,phase_max);
#endif
    } //phase
#ifdef DEBUG_PUCCH_RX 
      LOG_D(PHY,"[eNB] PUCCH fmt0:  stat_max : %d, sigma2_dB %d, phase_max : %d\n",dB_fixed(stat_max),sigma2_dB,phase_max);
#endif
    if (sigma2_dB<(dB_fixed(stat_max)-pucch1_thres))  //
      *payload = 1;
    else
      *payload = 0;

  }
  else if ((fmt == pucch_format1a)||(fmt == pucch_format1b)) {
    stat_max = 0;
#ifdef DEBUG_PUCCH_RX
    LOG_I(PHY,"Doing PUCCH detection for format 1a/1b\n");    
#endif
    for (phase=0;phase<7;phase++) {
      stat=0;
      for (aa=0;aa<frame_parms->nb_antennas_rx;aa++) {
	for (re=0;re<12;re++) {
	  stat_re=0;
	  stat_im=0;
	  stat_ref_re=0;
	  stat_ref_im=0;
	  off=re<<1;
	  cfo =  (frame_parms->Ncp==0) ? &cfo_pucch_np[14*phase] : &cfo_pucch_ep[12*phase];
	  
	  
	  for (l=0;l<(nsymb>>1);l++) {
	    if ((l<2)||(l>(nsymb>>1) - 3)) {  //data symbols
gauthier's avatar
gauthier committed
752 753
	      stat_re += ((rxcomp[aa][off]*(int32_t)cfo[l<<1])>>15)     - ((rxcomp[aa][1+off]*(int32_t)cfo[1+(l<<1)])>>15);
	      stat_im += ((rxcomp[aa][off]*(int32_t)cfo[1+(l<<1)])>>15) + ((rxcomp[aa][1+off]*(int32_t)cfo[(l<<1)])>>15);
754 755
	    } 
	    else {   //reference symbols
gauthier's avatar
gauthier committed
756 757
	      stat_ref_re += ((rxcomp[aa][off]*(int32_t)cfo[l<<1])>>15)     - ((rxcomp[aa][1+off]*(int32_t)cfo[1+(l<<1)])>>15);
	      stat_ref_im += ((rxcomp[aa][off]*(int32_t)cfo[1+(l<<1)])>>15) + ((rxcomp[aa][1+off]*(int32_t)cfo[(l<<1)])>>15);
758 759 760 761 762 763 764 765 766 767 768 769
	    }
	    off+=2;
#ifdef DEBUG_PUCCH_RX
	    LOG_D(PHY,"[eNB] PUCCH subframe %d (%d,%d) => (%d,%d) x (%d,%d) : (%d,%d)\n",subframe,l,re,
		rxcomp[aa][off],rxcomp[aa][1+off],
		cfo[l<<1],cfo[1+(l<<1)],
		stat_re,stat_im);
#endif	    
	  }

	  for (l2=0,l=(nsymb>>1);l<(nsymb-1);l++,l2++) {
	    if ((l2<2) || ((l2>(nsymb>>1) - 3)) ) {  // data symbols
gauthier's avatar
gauthier committed
770 771
	      stat_re += ((rxcomp[aa][off]*(int32_t)cfo[l2<<1])>>15)     - ((rxcomp[aa][1+off]*(int32_t)cfo[1+(l2<<1)])>>15);
	      stat_im += ((rxcomp[aa][off]*(int32_t)cfo[1+(l2<<1)])>>15) + ((rxcomp[aa][1+off]*(int32_t)cfo[(l2<<1)])>>15);
772 773
	    }
	    else {  //reference_symbols
gauthier's avatar
gauthier committed
774 775
	      stat_ref_re += ((rxcomp[aa][off]*(int32_t)cfo[l<<1])>>15)     - ((rxcomp[aa][1+off]*(int32_t)cfo[1+(l<<1)])>>15);
	      stat_ref_im += ((rxcomp[aa][off]*(int32_t)cfo[1+(l<<1)])>>15) + ((rxcomp[aa][1+off]*(int32_t)cfo[(l<<1)])>>15);
776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820
	    }
	    off+=2;
#ifdef DEBUG_PUCCH_RX
	    LOG_D(PHY,"[eNB] PUCCH subframe %d (%d,%d) => (%d,%d) x (%d,%d) : (%d,%d)\n",subframe,l2,re,
		rxcomp[aa][off],rxcomp[aa][1+off],
		cfo[l2<<1],cfo[1+(l2<<1)],
		stat_re,stat_im);
#endif	    
	    
	  }
	  stat += (((stat_re*stat_re)) + ((stat_im*stat_im)) + 
		   ((stat_ref_re*stat_ref_re)) + ((stat_ref_im*stat_ref_im)));
#ifdef DEBUG_PUCCH_RX
	  LOG_D(PHY,"aa%d re %d : phase %d : stat %d\n",aa,re,phase,stat);
#endif
	} //re 
      } // aa
#ifdef DEBUG_PUCCH_RX      
      LOG_I(PHY,"phase %d : stat %d\n",phase,stat);
#endif 
      if (stat>stat_max) {
	stat_max = stat;
	phase_max = phase;
      }
    } //phase
#ifdef DEBUG_PUCCH_RX 
    LOG_I(PHY,"[eNB] PUCCH fmt1:  stat_max : %d, phase_max : %d\n",stat_max,phase_max);
#endif

    // Do detection now
    stat_re=0;
    stat_im=0;

    if (sigma2_dB<(dB_fixed(stat_max)-pucch1_thres))  {//


      for (aa=0;aa<frame_parms->nb_antennas_rx;aa++) {
	for (re=0;re<12;re++) {
	  chest_re=0;
	  chest_im=0;
	  cfo =  (frame_parms->Ncp==0) ? &cfo_pucch_np[14*phase_max] : &cfo_pucch_ep[12*phase_max];
	  
	  // channel estimate for first slot
	  for (l=2;l<(nsymb>>1)-2;l++) {
	    off=(re<<1) + (24*l);
gauthier's avatar
gauthier committed
821 822
	    chest_re += ((rxcomp[aa][off]*(int32_t)cfo[l<<1])>>15)     - ((rxcomp[aa][1+off]*(int32_t)cfo[1+(l<<1)])>>15);
	    chest_im += ((rxcomp[aa][off]*(int32_t)cfo[1+(l<<1)])>>15) + ((rxcomp[aa][1+off]*(int32_t)cfo[(l<<1)])>>15);
823 824 825 826 827 828 829
	  }
#ifdef DEBUG_PUCCH_RX
	  LOG_D(PHY,"[eNB] PUCCH subframe %d l %d re %d chest1 => (%d,%d)\n",subframe,l,re,
		chest_re,chest_im);
#endif	    
	  for (l=0;l<2;l++) {
	    off=(re<<1) + (24*l);
gauthier's avatar
gauthier committed
830 831
	    tmp_re = ((rxcomp[aa][off]*(int32_t)cfo[l<<1])>>15)     - ((rxcomp[aa][1+off]*(int32_t)cfo[1+(l<<1)])>>15);
	    tmp_im = ((rxcomp[aa][off]*(int32_t)cfo[1+(l<<1)])>>15) + ((rxcomp[aa][1+off]*(int32_t)cfo[(l<<1)])>>15);
832 833 834 835 836 837 838 839 840 841 842 843
	    stat_re += ((tmp_re*chest_re)>>15) + ((tmp_im*chest_im)>>15);
	    stat_im += ((tmp_re*chest_im)>>15) - ((tmp_im*chest_re)>>15);
	    off+=2;
#ifdef DEBUG_PUCCH_RX
	    LOG_D(PHY,"[eNB] PUCCH subframe %d (%d,%d) => (%d,%d) x (%d,%d) : (%d,%d)\n",subframe,l,re,
		  rxcomp[aa][off],rxcomp[aa][1+off],
		  cfo[l<<1],cfo[1+(l<<1)],
		  stat_re,stat_im);
#endif	    
	  }
	  for (l=(nsymb>>1)-2;l<(nsymb>>1);l++) {
	    off=(re<<1) + (24*l);
gauthier's avatar
gauthier committed
844 845
	    tmp_re = ((rxcomp[aa][off]*(int32_t)cfo[l<<1])>>15)     - ((rxcomp[aa][1+off]*(int32_t)cfo[1+(l<<1)])>>15);
	    tmp_im = ((rxcomp[aa][off]*(int32_t)cfo[1+(l<<1)])>>15) + ((rxcomp[aa][1+off]*(int32_t)cfo[(l<<1)])>>15);
846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861
	    stat_re += ((tmp_re*chest_re)>>15) + ((tmp_im*chest_im)>>15);
	    stat_im += ((tmp_re*chest_im)>>15) - ((tmp_im*chest_re)>>15);
	    off+=2;
#ifdef DEBUG_PUCCH_RX
	    LOG_D(PHY,"[eNB] PUCCH subframe %d (%d,%d) => (%d,%d) x (%d,%d) : (%d,%d)\n",subframe,l,re,
		  rxcomp[aa][off],rxcomp[aa][1+off],
		  cfo[l<<1],cfo[1+(l<<1)],
		  stat_re,stat_im);
#endif	    
	  }	
	  
	  chest_re=0;
	  chest_im=0;
	  // channel estimate for second slot
	  for (l=2;l<(nsymb>>1)-2;l++) {
	    off=(re<<1) + (24*l) + (nsymb>>1)*24;
gauthier's avatar
gauthier committed
862 863
	    chest_re += ((rxcomp[aa][off]*(int32_t)cfo[l<<1])>>15)     - ((rxcomp[aa][1+off]*(int32_t)cfo[1+(l<<1)])>>15);
	    chest_im += ((rxcomp[aa][off]*(int32_t)cfo[1+(l<<1)])>>15) + ((rxcomp[aa][1+off]*(int32_t)cfo[(l<<1)])>>15);
864 865 866 867 868 869 870
	  }
#ifdef DEBUG_PUCCH_RX
	  LOG_D(PHY,"[eNB] PUCCH subframe %d l %d re %d chest2 => (%d,%d)\n",subframe,l,re,
		chest_re,chest_im);
#endif	    
	  for (l=0;l<2;l++) {
	    off=(re<<1) + (24*l) + (nsymb>>1)*24;
gauthier's avatar
gauthier committed
871 872
	    tmp_re = ((rxcomp[aa][off]*(int32_t)cfo[l<<1])>>15)     - ((rxcomp[aa][1+off]*(int32_t)cfo[1+(l<<1)])>>15);
	    tmp_im = ((rxcomp[aa][off]*(int32_t)cfo[1+(l<<1)])>>15) + ((rxcomp[aa][1+off]*(int32_t)cfo[(l<<1)])>>15);
873 874 875 876 877 878 879 880 881 882 883 884
	    stat_re += ((tmp_re*chest_re)>>15) + ((tmp_im*chest_im)>>15);
	    stat_im += ((tmp_re*chest_im)>>15) - ((tmp_im*chest_re)>>15);
	    off+=2;
#ifdef DEBUG_PUCCH_RX
	    LOG_D(PHY,"[PHY][eNB] PUCCH subframe %d (%d,%d) => (%d,%d) x (%d,%d) : (%d,%d)\n",subframe,l,re,
		  rxcomp[aa][off],rxcomp[aa][1+off],
		  cfo[l<<1],cfo[1+(l<<1)],
		  stat_re,stat_im);
#endif	    
	  }
	  for (l=(nsymb>>1)-2;l<(nsymb>>1)-1;l++) {
	    off=(re<<1) + (24*l) + (nsymb>>1)*24;
gauthier's avatar
gauthier committed
885 886
	    tmp_re = ((rxcomp[aa][off]*(int32_t)cfo[l<<1])>>15)     - ((rxcomp[aa][1+off]*(int32_t)cfo[1+(l<<1)])>>15);
	    tmp_im = ((rxcomp[aa][off]*(int32_t)cfo[1+(l<<1)])>>15) + ((rxcomp[aa][1+off]*(int32_t)cfo[(l<<1)])>>15);
887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921
	    stat_re += ((tmp_re*chest_re)>>9) + ((tmp_im*chest_im)>>9);
	    stat_im += ((tmp_re*chest_im)>>9) - ((tmp_im*chest_re)>>9);
	    off+=2;
#ifdef DEBUG_PUCCH_RX
	    LOG_D(PHY,"[PHY][eNB] PUCCH subframe %d (%d,%d) => (%d,%d) x (%d,%d) : (%d,%d)\n",subframe,l,re,
		  rxcomp[aa][off],rxcomp[aa][1+off],
		  cfo[l<<1],cfo[1+(l<<1)],
		  stat_re,stat_im);
#endif	
	  }
	  
#ifdef DEBUG_PUCCH_RX
	  LOG_D(PHY,"aa%d re %d : stat %d,%d\n",aa,re,stat_re,stat_im);
#endif
	  
	} //re 
      } // aa
      
#ifdef DEBUG_PUCCH_RX
      LOG_I(PHY,"stat %d,%d\n",stat_re,stat_im);
#endif    
      *payload = (stat_re<0) ? 1 : 0;
      if (fmt==pucch_format1b) 
	*(1+payload) = (stat_im<0) ? 1 : 0;
    }
    else {  // insufficient energy on PUCCH so NAK
      *payload = 0;
      if (fmt==pucch_format1b) 
	*(1+payload) = 0;
    }
  }
  else {
    LOG_E(PHY,"[eNB] PUCCH fmt2/2a/2b not supported\n");
  }

gauthier's avatar
gauthier committed
922
  return((int32_t)stat_max);
923 924 925 926

}


gauthier's avatar
gauthier committed
927 928
int32_t rx_pucch_emul(PHY_VARS_eNB *phy_vars_eNB,
		  uint8_t UE_index,
929
		  PUCCH_FMT_t fmt,
gauthier's avatar
gauthier committed
930 931
		  uint8_t n1_pucch_sel,
		  uint8_t *payload,
knopp's avatar
 
knopp committed
932
		  uint8_t sched_subframe) {
gauthier's avatar
gauthier committed
933 934
  uint8_t UE_id;
  uint16_t rnti;
knopp's avatar
 
knopp committed
935
  int subframe = phy_vars_eNB->proc[sched_subframe].subframe_rx;
knopp's avatar
 
knopp committed
936
  uint8_t CC_id = phy_vars_eNB->CC_id;
937 938 939

  rnti = phy_vars_eNB->ulsch_eNB[UE_index]->rnti;
  for (UE_id=0;UE_id<NB_UE_INST;UE_id++) {
940
    if (rnti == PHY_vars_UE_g[UE_id][CC_id]->lte_ue_pdcch_vars[0]->crnti)
941 942 943 944 945 946 947 948
      break;
  }
  if (UE_id==NB_UE_INST) {
    LOG_E(PHY,"rx_pucch_emul: FATAL, didn't find UE with rnti %x\n",rnti);
    return(-1);
  }

  if (fmt == pucch_format1) {
949
    payload[0] = PHY_vars_UE_g[UE_id][CC_id]->sr[subframe];
950 951
  }
  else if (fmt == pucch_format1a) {
952
    payload[0] = PHY_vars_UE_g[UE_id][CC_id]->pucch_payload[0];
953 954
  }
  else if (fmt == pucch_format1b) {
955 956
    payload[0] = PHY_vars_UE_g[UE_id][CC_id]->pucch_payload[0];
    payload[1] = PHY_vars_UE_g[UE_id][CC_id]->pucch_payload[1];    
957 958
  }
  else 
knopp's avatar
 
knopp committed
959
    LOG_E(PHY,"[eNB] Frame %d: Can't handle formats 2/2a/2b\n",phy_vars_eNB->proc[sched_subframe].frame_rx);
960

961
  if (PHY_vars_UE_g[UE_id][CC_id]->pucch_sel[subframe] == n1_pucch_sel)
962 963 964 965
    return(99);
  else
    return(0);
}