pucch.c 32.2 KB
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/*******************************************************************************

  Eurecom OpenAirInterface
  Copyright(c) 1999 - 2011 Eurecom

  This program is free software; you can redistribute it and/or modify it
  under the terms and conditions of the GNU General Public License,
  version 2, as published by the Free Software Foundation.

  This program is distributed in the hope 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
  this program; if not, write to the Free Software Foundation, Inc.,
  51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.

  The full GNU General Public License is included in this distribution in
  the file called "COPYING".

  Contact Information
  Openair Admin: openair_admin@eurecom.fr
  Openair Tech : openair_tech@eurecom.fr
  Forums       : http://forums.eurecom.fsr/openairinterface
  Address      : Eurecom, 2229, route des crêtes, 06560 Valbonne Sophia Antipolis, France

*******************************************************************************/

/*! \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"

//u8 ncs_cell[20][7];
//#define DEBUG_PUCCH_TX
//#define DEBUG_PUCCH_RX

s16 cfo_pucch_np[24*7] = {20787,-25330,27244,-18205,31356,-9512,32767,0,31356,9511,27244,18204,20787,25329,
			  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};

s16 cfo_pucch_ep[24*6] = {24278,-22005,29621,-14010,32412,-4808,32412,4807,29621,14009,24278,22004,
			  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};


void init_ncs_cell(LTE_DL_FRAME_PARMS *frame_parms,u8 ncs_cell[20][7]) {

  u8 ns,l,reset=1,i,N_UL_symb;
  u32 x1,x2,j=0,s=0;
  
  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
    }

  }
}

s16 alpha_re[12] = {32767, 28377, 16383,     0,-16384,  -28378,-32768,-28378,-16384,    -1, 16383, 28377};
s16 alpha_im[12] = {0,     16383, 28377, 32767, 28377,   16383,     0,-16384,-28378,-32768,-28378,-16384};

s16 W4[3][4] = {{32767, 32767, 32767, 32767},
		{32767,-32768, 32767,-32768},
		{32767,-32768,-32768, 32767}};
s16 W3_re[3][6] = {{32767, 32767, 32767},
		   {32767,-16384,-16384},
		   {32767,-16384,-16384}};

s16 W3_im[3][6] = {{0    ,0     ,0     },
		   {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,
		    u8 ncs_cell[20][7],
		    PUCCH_FMT_t fmt,
		    PUCCH_CONFIG_DEDICATED *pucch_config_dedicated,
		    u16 n1_pucch,
		    u16 n2_pucch,
		    u8 shortened_format,
		    u8 *payload,
		    s16 amp,
		    u8 subframe) {
  
  u32 u,v,n;
  u32 z[12*14],*zptr;
  s16 d0;
  u8 ns,N_UL_symb,nsymb,n_oc,n_oc0,n_oc1;
  u8 c = (frame_parms->Ncp==0) ? 3 : 2;
  u16 nprime,nprime0,nprime1;
  u16 i,j,re_offset,thres,h;
  u8 Nprime_div_deltaPUCCH_Shift,Nprime,d;
  u8 m,l,refs;
  u8 n_cs,S,alpha_ind,rem;
  s16 tmp_re,tmp_im,ref_re,ref_im,W_re=0,W_im=0;
  mod_sym_t *txptr;
  u32 symbol_offset;

  u8 deltaPUCCH_Shift          = frame_parms->pucch_config_common.deltaPUCCH_Shift;
  u8 NRB2                      = frame_parms->pucch_config_common.nRB_CQI;
  u8 Ncs1_div_deltaPUCCH_Shift = frame_parms->pucch_config_common.nCS_AN;

  u32 u0 = (frame_parms->Nid_cell + frame_parms->pusch_config_common.ul_ReferenceSignalsPUSCH.grouphop[subframe<<1]) % 30;
  u32 u1 = (frame_parms->Nid_cell + frame_parms->pusch_config_common.ul_ReferenceSignalsPUSCH.grouphop[1+(subframe<<1)]) % 30;
  u32 v0=frame_parms->pusch_config_common.ul_ReferenceSignalsPUSCH.seqhop[subframe<<1];
  u32 v1=frame_parms->pusch_config_common.ul_ReferenceSignalsPUSCH.seqhop[1+(subframe<<1)];
  
  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 (NRB2 > 2047) {
    msg("[PHY] generate_pucch: Illegal NRB2 %d (should be 0...2047)\n",NRB2);
    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
	n_cs = ((u16)n_cs + (nprime*deltaPUCCH_Shift + (n_oc%deltaPUCCH_Shift))%Nprime)%12;
      }
      else {
	n_cs = ((u16)n_cs + (nprime*deltaPUCCH_Shift + (n_oc>>1))%Nprime)%12;	
      }


      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)
	tmp_re = (s16)(((s32)alpha_re[alpha_ind] * ul_ref_sigs[u][v][0][n<<1] - (s32)alpha_im[alpha_ind] * ul_ref_sigs[u][v][0][1+(n<<1)])>>15);
	tmp_im = (s16)(((s32)alpha_re[alpha_ind] * ul_ref_sigs[u][v][0][1+(n<<1)] + (s32)alpha_im[alpha_ind] * ul_ref_sigs[u][v][0][n<<1])>>15);

	// 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
	    
	    ((s16 *)&zptr[n])[0] = ((s32)amp*ref_re)>>15;
	    ((s16 *)&zptr[n])[1] = ((s32)amp*ref_im)>>15;
	    
	    break;
	    
	  case pucch_format1a:  //BPSK 1-bit
	    d0 = (payload[0]&1)==0 ? amp : -amp;
	    ((s16 *)&zptr[n])[0] = ((s32)d0*ref_re)>>15;
	    ((s16 *)&zptr[n])[1] = ((s32)d0*ref_im)>>15;
	    //	    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
	      ((s16 *)&zptr[n])[0] = ((s32)amp*ref_re)>>15;
	      ((s16 *)&zptr[n])[1] = ((s32)amp*ref_im)>>15;
	    }
	    else if (((payload[0]&1)==0) && ((payload[1]&1)==1))  {// -j
	      ((s16 *)&zptr[n])[0] = ((s32)amp*ref_im)>>15;
	      ((s16 *)&zptr[n])[1] = (-(s32)amp*ref_re)>>15;
	    }
	    else if (((payload[0]&1)==1) && ((payload[1]&1)==0))  {// j
	      ((s16 *)&zptr[n])[0] = (-(s32)amp*ref_im)>>15;
	      ((s16 *)&zptr[n])[1] = ((s32)amp*ref_re)>>15;
	    }
	    else  {// -1
	      ((s16 *)&zptr[n])[0] = (-(s32)amp*ref_re)>>15;
	      ((s16 *)&zptr[n])[1] = (-(s32)amp*ref_im)>>15;
	    }
	    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

	  ((s16 *)&zptr[n])[0] = ((s32)amp*ref_re)>>15;
	  ((s16 *)&zptr[n])[1] = ((s32)amp*ref_im)>>15;
	  //	  printf("ref\n");
	}
#ifdef DEBUG_PUCCH_TX
	msg("[PHY] PUCCH subframe %d z(%d,%d) => %d,%d, alpha(%d) => %d,%d\n",subframe,l,n,((s16 *)&zptr[n])[0],((s16 *)&zptr[n])[1],
	    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
      msg("[PHY] PUCCH subframe %d (%d,%d,%d,%d) => %d,%d\n",subframe,l,i,re_offset-1,m,((s16 *)&z[j])[0],((s16 *)&z[j])[1]);
#endif
    }
  }

}

void generate_pucch_emul(PHY_VARS_UE *phy_vars_ue,
			 PUCCH_FMT_t format,
			 u8 ncs1,
			 u8 *pucch_payload,
			 u8 sr,
			 u8 subframe) {

  UE_transport_info[phy_vars_ue->Mod_id].cntl.pucch_flag    = format;
  UE_transport_info[phy_vars_ue->Mod_id].cntl.pucch_Ncs1    = ncs1;


  UE_transport_info[phy_vars_ue->Mod_id].cntl.sr            = sr;
  // the value of phy_vars_ue->pucch_sel[subframe] is set by get_n1_pucch
  UE_transport_info[phy_vars_ue->Mod_id].cntl.pucch_sel      = phy_vars_ue->pucch_sel[subframe];
  
  // 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];
    UE_transport_info[phy_vars_ue->Mod_id].cntl.pucch_payload = pucch_payload[0];
  }
  else if (format == pucch_format1b) {
    phy_vars_ue->pucch_payload[0] = pucch_payload[0] + (pucch_payload[1]<<1);
    UE_transport_info[phy_vars_ue->Mod_id].cntl.pucch_payload = pucch_payload[0] + (pucch_payload[1]<<1);
  }
  else if (format == pucch_format1) {
    LOG_D(PHY,"[UE %d] Frame %d subframe %d Generating PUCCH for SR %d\n",phy_vars_ue->Mod_id,phy_vars_ue->frame,subframe,sr);
  }
  phy_vars_ue->sr[subframe] = sr; 

}

s32 rx_pucch(PHY_VARS_eNB *phy_vars_eNB,
	     PUCCH_FMT_t fmt,
	     u8 UE_id,
	     u16 n1_pucch,
	     u16 n2_pucch,
	     u8 shortened_format,
	     u8 *payload,
	     u8 subframe,
	     u8 pucch1_thres) {


  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];
  s8 sigma2_dB                                   = phy_vars_eNB->PHY_measurements_eNB[0].n0_power_tot_dB;
  u32 u,v,n,aa;
  u32 z[12*14];
  s16 *zptr;
  s16 rxcomp[NB_ANTENNAS_RX][2*12*14];
  u8 ns,N_UL_symb,nsymb,n_oc,n_oc0,n_oc1;
  u8 c = (frame_parms->Ncp==0) ? 3 : 2;
  u16 nprime,nprime0,nprime1;
  u16 i,j,re_offset,thres,h,off;
  u8 Nprime_div_deltaPUCCH_Shift,Nprime,d;
  u8 m,l,refs,phase,re,l2,phase_max=0;
  u8 n_cs,S,alpha_ind,rem;
  s16 tmp_re,tmp_im,W_re=0,W_im=0;
  s16 *rxptr;
  u32 symbol_offset;
  s16 stat_ref_re,stat_ref_im,*cfo,chest_re,chest_im;
  s32 stat_re=0,stat_im=0;
  s32 stat,stat_max=0;

  u8 deltaPUCCH_Shift          = frame_parms->pucch_config_common.deltaPUCCH_Shift;
  u8 NRB2                      = frame_parms->pucch_config_common.nRB_CQI;
  u8 Ncs1_div_deltaPUCCH_Shift = frame_parms->pucch_config_common.nCS_AN;

  u32 u0 = (frame_parms->Nid_cell + frame_parms->pusch_config_common.ul_ReferenceSignalsPUSCH.grouphop[subframe<<1]) % 30;
  u32 u1 = (frame_parms->Nid_cell + frame_parms->pusch_config_common.ul_ReferenceSignalsPUSCH.grouphop[1+(subframe<<1)]) % 30;
  u32 v0=frame_parms->pusch_config_common.ul_ReferenceSignalsPUSCH.seqhop[subframe<<1];
  u32 v1=frame_parms->pusch_config_common.ul_ReferenceSignalsPUSCH.seqhop[1+(subframe<<1)];


  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 (NRB2 > 2047) {
    LOG_E(PHY,"[eNB] rx_pucch: Illegal NRB2 %d (should be 0...2047)\n",NRB2);
    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);
  }

  zptr = (s16 *)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_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
	n_cs = ((u16)n_cs + (nprime*deltaPUCCH_Shift + (n_oc%deltaPUCCH_Shift))%Nprime)%12;
      }
      else {
	n_cs = ((u16)n_cs + (nprime*deltaPUCCH_Shift + (n_oc>>1))%Nprime)%12;	
      }


      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)
	tmp_re = (s16)(((s32)alpha_re[alpha_ind] * ul_ref_sigs[u][v][0][n<<1] - (s32)alpha_im[alpha_ind] * ul_ref_sigs[u][v][0][1+(n<<1)])>>15);
	tmp_im = (s16)(((s32)alpha_re[alpha_ind] * ul_ref_sigs[u][v][0][1+(n<<1)] + (s32)alpha_im[alpha_ind] * ul_ref_sigs[u][v][0][n<<1])>>15);

	// 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;

  zptr = (s16*)z;

  // 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;
#ifndef NEW_FFT
      rxptr = (s16 *)&eNB_common_vars->rxdataF[0][aa][2*symbol_offset];
#else
      rxptr = (s16 *)&eNB_common_vars->rxdataF[0][aa][symbol_offset];
#endif      
      for (i=0;i<12;i++,j+=2,re_offset++) {
#ifndef NEW_FFT	
	rxcomp[aa][j]   = (s16)((rxptr[re_offset<<2]*(s32)zptr[j])>>15)   - ((rxptr[1+(re_offset<<2)]*(s32)zptr[1+j])>>15);
	rxcomp[aa][1+j] = (s16)((rxptr[re_offset<<2]*(s32)zptr[1+j])>>15) + ((rxptr[1+(re_offset<<2)]*(s32)zptr[j])>>15);
#else
	rxcomp[aa][j]   = (s16)((rxptr[re_offset<<1]*(s32)zptr[j])>>15)   - ((rxptr[1+(re_offset<<1)]*(s32)zptr[1+j])>>15);
	rxcomp[aa][1+j] = (s16)((rxptr[re_offset<<1]*(s32)zptr[1+j])>>15) + ((rxptr[1+(re_offset<<1)]*(s32)zptr[j])>>15);
#endif
	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++) {
	    stat_re += ((rxcomp[aa][off]*(s32)cfo[l<<1])>>15)     - ((rxcomp[aa][1+off]*(s32)cfo[1+(l<<1)])>>15);
	    stat_im += ((rxcomp[aa][off]*(s32)cfo[1+(l<<1)])>>15) + ((rxcomp[aa][1+off]*(s32)cfo[(l<<1)])>>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 (l2=0,l=(nsymb>>1);l<(nsymb-1);l++,l2++) {
	    stat_re += ((rxcomp[aa][off]*(s32)cfo[l2<<1])>>15)     - ((rxcomp[aa][1+off]*(s32)cfo[1+(l2<<1)])>>15);
	    stat_im += ((rxcomp[aa][off]*(s32)cfo[1+(l2<<1)])>>15) + ((rxcomp[aa][1+off]*(s32)cfo[(l2<<1)])>>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,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
	      stat_re += ((rxcomp[aa][off]*(s32)cfo[l<<1])>>15)     - ((rxcomp[aa][1+off]*(s32)cfo[1+(l<<1)])>>15);
	      stat_im += ((rxcomp[aa][off]*(s32)cfo[1+(l<<1)])>>15) + ((rxcomp[aa][1+off]*(s32)cfo[(l<<1)])>>15);
	    } 
	    else {   //reference symbols
	      stat_ref_re += ((rxcomp[aa][off]*(s32)cfo[l<<1])>>15)     - ((rxcomp[aa][1+off]*(s32)cfo[1+(l<<1)])>>15);
	      stat_ref_im += ((rxcomp[aa][off]*(s32)cfo[1+(l<<1)])>>15) + ((rxcomp[aa][1+off]*(s32)cfo[(l<<1)])>>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 (l2=0,l=(nsymb>>1);l<(nsymb-1);l++,l2++) {
	    if ((l2<2) || ((l2>(nsymb>>1) - 3)) ) {  // data symbols
	      stat_re += ((rxcomp[aa][off]*(s32)cfo[l2<<1])>>15)     - ((rxcomp[aa][1+off]*(s32)cfo[1+(l2<<1)])>>15);
	      stat_im += ((rxcomp[aa][off]*(s32)cfo[1+(l2<<1)])>>15) + ((rxcomp[aa][1+off]*(s32)cfo[(l2<<1)])>>15);
	    }
	    else {  //reference_symbols
	      stat_ref_re += ((rxcomp[aa][off]*(s32)cfo[l<<1])>>15)     - ((rxcomp[aa][1+off]*(s32)cfo[1+(l<<1)])>>15);
	      stat_ref_im += ((rxcomp[aa][off]*(s32)cfo[1+(l<<1)])>>15) + ((rxcomp[aa][1+off]*(s32)cfo[(l<<1)])>>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,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);
	    chest_re += ((rxcomp[aa][off]*(s32)cfo[l<<1])>>15)     - ((rxcomp[aa][1+off]*(s32)cfo[1+(l<<1)])>>15);
	    chest_im += ((rxcomp[aa][off]*(s32)cfo[1+(l<<1)])>>15) + ((rxcomp[aa][1+off]*(s32)cfo[(l<<1)])>>15);
	  }
#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);
	    tmp_re = ((rxcomp[aa][off]*(s32)cfo[l<<1])>>15)     - ((rxcomp[aa][1+off]*(s32)cfo[1+(l<<1)])>>15);
	    tmp_im = ((rxcomp[aa][off]*(s32)cfo[1+(l<<1)])>>15) + ((rxcomp[aa][1+off]*(s32)cfo[(l<<1)])>>15);
	    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);
	    tmp_re = ((rxcomp[aa][off]*(s32)cfo[l<<1])>>15)     - ((rxcomp[aa][1+off]*(s32)cfo[1+(l<<1)])>>15);
	    tmp_im = ((rxcomp[aa][off]*(s32)cfo[1+(l<<1)])>>15) + ((rxcomp[aa][1+off]*(s32)cfo[(l<<1)])>>15);
	    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;
	    chest_re += ((rxcomp[aa][off]*(s32)cfo[l<<1])>>15)     - ((rxcomp[aa][1+off]*(s32)cfo[1+(l<<1)])>>15);
	    chest_im += ((rxcomp[aa][off]*(s32)cfo[1+(l<<1)])>>15) + ((rxcomp[aa][1+off]*(s32)cfo[(l<<1)])>>15);
	  }
#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;
	    tmp_re = ((rxcomp[aa][off]*(s32)cfo[l<<1])>>15)     - ((rxcomp[aa][1+off]*(s32)cfo[1+(l<<1)])>>15);
	    tmp_im = ((rxcomp[aa][off]*(s32)cfo[1+(l<<1)])>>15) + ((rxcomp[aa][1+off]*(s32)cfo[(l<<1)])>>15);
	    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;
	    tmp_re = ((rxcomp[aa][off]*(s32)cfo[l<<1])>>15)     - ((rxcomp[aa][1+off]*(s32)cfo[1+(l<<1)])>>15);
	    tmp_im = ((rxcomp[aa][off]*(s32)cfo[1+(l<<1)])>>15) + ((rxcomp[aa][1+off]*(s32)cfo[(l<<1)])>>15);
	    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");
  }

  return((s32)stat_max);

}


s32 rx_pucch_emul(PHY_VARS_eNB *phy_vars_eNB,
		  u8 UE_index,
		  PUCCH_FMT_t fmt,
		  u8 n1_pucch_sel,
		  u8 *payload,
		  u8 subframe) {
  u8 UE_id;
  u16 rnti;

  rnti = phy_vars_eNB->ulsch_eNB[UE_index]->rnti;
  for (UE_id=0;UE_id<NB_UE_INST;UE_id++) {
    if (rnti == PHY_vars_UE_g[UE_id]->lte_ue_pdcch_vars[0]->crnti)
      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) {
    payload[0] = PHY_vars_UE_g[UE_id]->sr[subframe];
  }
  else if (fmt == pucch_format1a) {
    payload[0] = PHY_vars_UE_g[UE_id]->pucch_payload[0];
  }
  else if (fmt == pucch_format1b) {
    payload[0] = PHY_vars_UE_g[UE_id]->pucch_payload[0];
    payload[1] = PHY_vars_UE_g[UE_id]->pucch_payload[1];    
  }
  else 
    LOG_E(PHY,"[eNB] Frame %d: Can't handle formats 2/2a/2b\n",phy_vars_eNB->frame);

  if (PHY_vars_UE_g[UE_id]->pucch_sel[subframe] == n1_pucch_sel)
    return(99);
  else
    return(0);
}