dlsch_modulation.c 50.5 KB
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/*******************************************************************************
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    OpenAirInterface
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    Copyright(c) 1999 - 2014 Eurecom
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    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.
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    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.
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    You should have received a copy of the GNU General Public License
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    along with OpenAirInterface.The full GNU General Public License is
   included in this distribution in the file called "COPYING". If not,
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   see <http://www.gnu.org/licenses/>.
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  Contact Information
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  OpenAirInterface Admin: openair_admin@eurecom.fr
  OpenAirInterface Tech : openair_tech@eurecom.fr
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  OpenAirInterface Dev  : openair4g-devel@lists.eurecom.fr
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  Address      : Eurecom, Campus SophiaTech, 450 Route des Chappes, CS 50193 - 06904 Biot Sophia Antipolis cedex, FRANCE
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 *******************************************************************************/
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/*! \file PHY/LTE_TRANSPORT/dlsch_modulation.c
* \brief Top-level routines for generating the PDSCH physical channel from 36-211, V8.6 2009-03
* \author R. Knopp, F. Kaltenberger
* \date 2011
* \version 0.1
* \company Eurecom
* \email: knopp@eurecom.fr,florian.kaltenberger@eurecom.fr
* \note
* \warning
*/
#include "PHY/defs.h"
#include "PHY/extern.h"
#include "PHY/CODING/defs.h"
#include "PHY/CODING/extern.h"
#include "PHY/CODING/lte_interleaver_inline.h"
#include "PHY/LTE_TRANSPORT/defs.h"
#include "defs.h"
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#include "UTIL/LOG/vcd_signal_dumper.h"
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//#define DEBUG_DLSCH_MODULATION
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//#define is_not_pilot(pilots,re,nushift,use2ndpilots) ((pilots==0) || ((re!=nushift) && (re!=nushift+6)&&((re!=nushift+3)||(use2ndpilots==1))&&((re!=nushift+9)||(use2ndpilots==1)))?1:0)

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uint8_t is_not_pilot(uint8_t pilots, uint8_t re, uint8_t nushift, uint8_t use2ndpilots)
{
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  uint8_t offset = (pilots==2)?3:0;
  int nushiftmod3 = nushift%3;
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  if (pilots==0)
    return(1);

  if (use2ndpilots==1) {  // This is for SISO (mode 1)
    if ((re!=nushift+offset) && (re!=((nushift+6+offset)%12)))
      return(1);
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  } else { // 2 antenna pilots
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    if ((re!=nushiftmod3) && (re!=nushiftmod3+6) && (re!=nushiftmod3+3) && (re!=nushiftmod3+9))
      return(1);
  }
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  return(0);
}

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uint8_t is_not_UEspecRS(int first_layer,int re)
{
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  return(1);
}

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void generate_64qam_table(void)
{
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  int a,b,c,index;


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  for (a=-1; a<=1; a+=2)
    for (b=-1; b<=1; b+=2)
      for (c=-1; c<=1; c+=2) {
        index = (1+a)*2 + (1+b) + (1+c)/2;
        qam64_table[index] = -a*(QAM64_n1 + b*(QAM64_n2 + (c*QAM64_n3))); // 0 1 2
      }
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}

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void generate_16qam_table(void)
{
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  int a,b,index;

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  for (a=-1; a<=1; a+=2)
    for (b=-1; b<=1; b+=2) {
      index = (1+a) + (1+b)/2;
      qam16_table[index] = -a*(QAM16_n1 + (b*QAM16_n2));
    }
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}




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void layer1prec2A(int32_t *antenna0_sample, int32_t *antenna1_sample, uint8_t precoding_index)
{
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  switch (precoding_index) {

  case 0: // 1 1
    *antenna1_sample=*antenna0_sample;
    break;

  case 1: // 1 -1
    ((int16_t *)antenna1_sample)[0] = -((int16_t *)antenna0_sample)[0];
    ((int16_t *)antenna1_sample)[1] = -((int16_t *)antenna0_sample)[1];
    break;

  case 2: // 1 j
    ((int16_t *)antenna1_sample)[0] = -((int16_t *)antenna0_sample)[1];
    ((int16_t *)antenna1_sample)[1] = ((int16_t *)antenna0_sample)[0];
    break;

  case 3: // 1 -j
    ((int16_t *)antenna1_sample)[0] = ((int16_t *)antenna0_sample)[1];
    ((int16_t *)antenna1_sample)[1] = -((int16_t *)antenna0_sample)[0];
    break;
  }

  // normalize
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  /*  ((int16_t *)antenna0_sample)[0] = (int16_t)((((int16_t *)antenna0_sample)[0]*ONE_OVER_SQRT2_Q15)>>15);
  ((int16_t *)antenna0_sample)[1] = (int16_t)((((int16_t *)antenna0_sample)[1]*ONE_OVER_SQRT2_Q15)>>15);  ((int16_t *)antenna1_sample)[0] = (int16_t)((((int16_t *)antenna1_sample)[0]*ONE_OVER_SQRT2_Q15)>>15);
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  ((int16_t *)antenna1_sample)[1] = (int16_t)((((int16_t *)antenna1_sample)[1]*ONE_OVER_SQRT2_Q15)>>15);  */
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}
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int allocate_REs_in_RB(LTE_DL_FRAME_PARMS *frame_parms,
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                       mod_sym_t **txdataF,
                       uint32_t *jj,
                       uint32_t *jj2,
                       uint16_t re_offset,
                       uint32_t symbol_offset,
                       LTE_DL_eNB_HARQ_t *dlsch0_harq,
                       LTE_DL_eNB_HARQ_t *dlsch1_harq,
                       uint8_t pilots,
                       int16_t amp,
                       uint8_t precoder_index,
                       int16_t *qam_table_s0,
                       int16_t *qam_table_s1,
                       uint32_t *re_allocated,
                       uint8_t skip_dc,
                       uint8_t skip_half)
{
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  uint8_t *x0             = dlsch0_harq->e;
  MIMO_mode_t mimo_mode   = dlsch0_harq->mimo_mode;

  int first_layer0        = dlsch0_harq->first_layer;
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  int Nlayers0            = dlsch0_harq->Nlayers;
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  uint8_t mod_order0      = get_Qm(dlsch0_harq->mcs);
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  uint8_t mod_order1=2;
  uint8_t precoder_index0,precoder_index1;
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  uint8_t *x1=NULL;
  // Fill these in later for TM8-10
  //  int Nlayers1;
  //  int first_layer1;
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  int use2ndpilots = (frame_parms->mode1_flag==1)?1:0;
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  uint32_t tti_offset,aa;
  uint8_t re;
  uint8_t qam64_table_offset_re = 0;
  uint8_t qam64_table_offset_im = 0;
  uint8_t qam16_table_offset_re = 0;
  uint8_t qam16_table_offset_im = 0;
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  uint8_t qam64_table_offset_re0 = 0;
  uint8_t qam64_table_offset_im0 = 0;
  uint8_t qam16_table_offset_re0 = 0;
  uint8_t qam16_table_offset_im0 = 0;
  uint8_t qam64_table_offset_re1 = 0;
  uint8_t qam64_table_offset_im1 = 0;
  uint8_t qam16_table_offset_re1 = 0;
  uint8_t qam16_table_offset_im1 = 0;
  int16_t xx0_re,xx1_re;
  int16_t xx0_im,xx1_im;

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  int16_t gain_lin_QPSK;//,gain_lin_16QAM1,gain_lin_16QAM2;
  int16_t re_off=re_offset;
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  uint8_t first_re,last_re;
  int32_t tmp_sample1,tmp_sample2;
  int16_t tmp_amp=amp;
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  int s=1;

  gain_lin_QPSK = (int16_t)((amp*ONE_OVER_SQRT2_Q15)>>15);
  //  if (mimo_mode == LARGE_CDD) gain_lin_QPSK>>=1;

  if (dlsch1_harq) {
    x1             = dlsch1_harq->e;
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    // Fill these in later for TM8-10
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    //    Nlayers1       = dlsch1_harq->Nlayers;
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    //    first_layer1   = dlsch1_harq->first_layer;
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    mod_order1     = get_Qm(dlsch1_harq->mcs);

  }
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  /*
  switch (mod_order) {
  case 2:
    // QPSK single stream
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    break;
  case 4:
    //16QAM Single stream
    gain_lin_16QAM1 = (int16_t)(((int32_t)amp*QAM16_n1)>>15);
    gain_lin_16QAM2 = (int16_t)(((int32_t)amp*QAM16_n2)>>15);
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    break;
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  case 6:
    //64QAM Single stream
    break;
  default:
    break;
  }
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  */
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#ifdef DEBUG_DLSCH_MODULATION
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  printf("allocate_re (mod %d): symbol_offset %d re_offset %d (%d,%d), jj %d -> %d,%d\n",mod_order0,symbol_offset,re_offset,skip_dc,skip_half,*jj, x0[*jj], x0[1+*jj]);
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#endif

  first_re=0;
  last_re=12;

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  if (skip_half==1)
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    last_re=6;
  else if (skip_half==2)
    first_re=6;
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  for (re=first_re; re<last_re; re++) {
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    if ((skip_dc == 1) && (re==6))
      re_off=re_off - frame_parms->ofdm_symbol_size+1;
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    tti_offset = symbol_offset + re_off + re;
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    // check that RE is not from Cell-specific RS

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    if (is_not_pilot(pilots,re,frame_parms->nushift,use2ndpilots)==1) {
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      //     printf("re %d (jj %d)\n",re,*jj);
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      if (mimo_mode == SISO) {  //SISO mapping
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        *re_allocated = *re_allocated + 1;

        switch (mod_order0) {
        case 2:  //QPSK

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//          printf("%d(%d) : %d,%d => ",tti_offset,*jj,((int16_t*)&txdataF[0][tti_offset])[0],((int16_t*)&txdataF[0][tti_offset])[1]);
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          for (aa=0; aa<frame_parms->nb_antennas_tx; aa++) {
            ((int16_t*)&txdataF[aa][tti_offset])[0] += (x0[*jj]==1) ? (-gain_lin_QPSK) : gain_lin_QPSK; //I //b_i
          }

          *jj = *jj + 1;

          for (aa=0; aa<frame_parms->nb_antennas_tx; aa++) {
            ((int16_t*)&txdataF[aa][tti_offset])[1] += (x0[*jj]==1) ? (-gain_lin_QPSK) : gain_lin_QPSK; //Q //b_{i+1}
          }

          *jj = *jj + 1;

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 //         printf("%d,%d\n",((int16_t*)&txdataF[0][tti_offset])[0],((int16_t*)&txdataF[0][tti_offset])[1]);
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          break;

        case 4:  //16QAM

          qam16_table_offset_re = 0;
          qam16_table_offset_im = 0;

          if (x0[*jj] == 1)
            qam16_table_offset_re+=2;

          *jj=*jj+1;

          if (x0[*jj] == 1)
            qam16_table_offset_im+=2;

          *jj=*jj+1;


          if (x0[*jj] == 1)
            qam16_table_offset_re+=1;

          *jj=*jj+1;

          if (x0[*jj] == 1)
            qam16_table_offset_im+=1;

          *jj=*jj+1;

          for (aa=0; aa<frame_parms->nb_antennas_tx; aa++) {
            ((int16_t *)&txdataF[aa][tti_offset])[0]+=qam_table_s0[qam16_table_offset_re];
            ((int16_t *)&txdataF[aa][tti_offset])[1]+=qam_table_s0[qam16_table_offset_im];
            //      ((int16_t *)&txdataF[aa][tti_offset])[0]+=(int16_t)(((int32_t)amp*qam16_table[qam16_table_offset_re])>>15);
            //      ((int16_t *)&txdataF[aa][tti_offset])[1]+=(int16_t)(((int32_t)amp*qam16_table[qam16_table_offset_im])>>15);
          }

          break;

        case 6:  //64QAM


          qam64_table_offset_re = 0;
          qam64_table_offset_im = 0;

          if (x0[*jj] == 1)
            qam64_table_offset_re+=4;

          *jj=*jj+1;

          if (x0[*jj] == 1)
            qam64_table_offset_im+=4;

          *jj=*jj+1;

          if (x0[*jj] == 1)
            qam64_table_offset_re+=2;

          *jj=*jj+1;

          if (x0[*jj] == 1)
            qam64_table_offset_im+=2;

          *jj=*jj+1;

          if (x0[*jj] == 1)
            qam64_table_offset_re+=1;

          *jj=*jj+1;

          if (x0[*jj] == 1)
            qam64_table_offset_im+=1;

          *jj=*jj+1;

          for (aa=0; aa<frame_parms->nb_antennas_tx; aa++) {
            ((int16_t *)&txdataF[aa][tti_offset])[0]+=qam_table_s0[qam64_table_offset_re];//(int16_t)(((int32_t)amp*qam64_table[qam64_table_offset_re])>>15);
            ((int16_t *)&txdataF[aa][tti_offset])[1]+=qam_table_s0[qam64_table_offset_im];//(int16_t)(((int32_t)amp*qam64_table[qam64_table_offset_im])>>15);
          }

          break;

        }
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      }

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      else if (mimo_mode == ALAMOUTI) {
        *re_allocated = *re_allocated + 1;
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        amp = (int16_t)(((int32_t)tmp_amp*ONE_OVER_SQRT2_Q15)>>15);

        switch (mod_order0) {
        case 2:  //QPSK

          // first antenna position n -> x0

          ((int16_t*)&tmp_sample1)[0] = (x0[*jj]==1) ? (-gain_lin_QPSK) : gain_lin_QPSK;
          *jj=*jj+1;
          ((int16_t*)&tmp_sample1)[1] = (x0[*jj]==1) ? (-gain_lin_QPSK) : gain_lin_QPSK;
          *jj=*jj+1;

          // second antenna position n -> -x1*

          ((int16_t*)&tmp_sample2)[0] = (x0[*jj]==1) ? (gain_lin_QPSK) : -gain_lin_QPSK;
          *jj=*jj+1;
          ((int16_t*)&tmp_sample2)[1] = (x0[*jj]==1) ? (-gain_lin_QPSK) : gain_lin_QPSK;
          *jj=*jj+1;

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      // normalization for 2 tx antennas
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	  ((int16_t*)&txdataF[0][tti_offset])[0] += (int16_t)((((int16_t*)&tmp_sample1)[0]*ONE_OVER_SQRT2_Q15)>>15);
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	  ((int16_t*)&txdataF[0][tti_offset])[1] += (int16_t)((((int16_t*)&tmp_sample1)[1]*ONE_OVER_SQRT2_Q15)>>15);
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	  ((int16_t*)&txdataF[1][tti_offset])[0] += (int16_t)((((int16_t*)&tmp_sample2)[0]*ONE_OVER_SQRT2_Q15)>>15);
	  ((int16_t*)&txdataF[1][tti_offset])[1] += (int16_t)((((int16_t*)&tmp_sample2)[1]*ONE_OVER_SQRT2_Q15)>>15);
	  
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	  break;
	  
	case 4:  //16QAM
	  
	  // Antenna 0 position n 
	  
	  qam16_table_offset_re = 0;
	  qam16_table_offset_im = 0;
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	  if (x0[*jj] == 1)
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	    qam16_table_offset_re+=2;
	  *jj=*jj+1;
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	  if (x0[*jj] == 1)
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	    qam16_table_offset_im+=2;
	  *jj=*jj+1;
	  
	  
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	  if (x0[*jj] == 1)
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	    qam16_table_offset_re+=1;
	  *jj=*jj+1;
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	  if (x0[*jj] == 1)
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	    qam16_table_offset_im+=1;
	  *jj=*jj+1;
	  
	  ((int16_t *)&txdataF[0][tti_offset])[0]+=(int16_t)(((int32_t)amp*qam16_table[qam16_table_offset_re])>>15);
	  ((int16_t *)&txdataF[0][tti_offset])[1]+=(int16_t)(((int32_t)amp*qam16_table[qam16_table_offset_im])>>15);
	  
	  // Antenna 1 position n Real part -> -x1*
	  
	  qam16_table_offset_re = 0;
	  qam16_table_offset_im = 0;
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	  if (x0[*jj] == 1)
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	    qam16_table_offset_re+=2;
	  *jj=*jj+1;
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	  if (x0[*jj] == 1)
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	    qam16_table_offset_im+=2;
	  *jj=*jj+1;
	  
	  
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	  if (x0[*jj] == 1)
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	    qam16_table_offset_re+=1;
	  *jj=*jj+1;
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	  if (x0[*jj] == 1)
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	    qam16_table_offset_im+=1;
	  *jj=*jj+1;
	  
	  ((int16_t *)&txdataF[1][tti_offset])[0]+=-(int16_t)(((int32_t)amp*qam16_table[qam16_table_offset_re])>>15);
	  ((int16_t *)&txdataF[1][tti_offset])[1]+=(int16_t)(((int32_t)amp*qam16_table[qam16_table_offset_im])>>15);
	  
	  
	  break;
	case 6:   // 64-QAM
	  
	  // Antenna 0
	  qam64_table_offset_re = 0;
	  qam64_table_offset_im = 0;

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	  if (x0[*jj] == 1)
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	    qam64_table_offset_re+=4;
	  *jj=*jj+1;
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	  if (x0[*jj] == 1)
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	    qam64_table_offset_im+=4;
	  *jj=*jj+1;
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	  if (x0[*jj] == 1)
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	    qam64_table_offset_re+=2;
	  *jj=*jj+1;
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	  if (x0[*jj] == 1)
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	    qam64_table_offset_im+=2;
	  *jj=*jj+1;
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	  if (x0[*jj] == 1)
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	    qam64_table_offset_re+=1;
	  *jj=*jj+1;
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	  if (x0[*jj] == 1)
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	    qam64_table_offset_im+=1;
	  *jj=*jj+1;
	  
	  ((int16_t *)&txdataF[0][tti_offset])[0]+=(int16_t)(((int32_t)amp*qam64_table[qam64_table_offset_re])>>15);
	  ((int16_t *)&txdataF[0][tti_offset])[1]+=(int16_t)(((int32_t)amp*qam64_table[qam64_table_offset_im])>>15);
	  
	  
	  // Antenna 1 => -x1*
	  qam64_table_offset_re = 0;
	  qam64_table_offset_im = 0;
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	  if (x0[*jj] == 1)
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	    qam64_table_offset_re+=4;
	  *jj=*jj+1;
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	  if (x0[*jj] == 1)
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	    qam64_table_offset_im+=4;
	  *jj=*jj+1;
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	  if (x0[*jj] == 1)
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	    qam64_table_offset_re+=2;
	  *jj=*jj+1;
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	  if (x0[*jj] == 1)
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	    qam64_table_offset_im+=2;
	  *jj=*jj+1;
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	  if (x0[*jj] == 1)
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	    qam64_table_offset_re+=1;
	  *jj=*jj+1;
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	  if (x0[*jj] == 1)
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	    qam64_table_offset_im+=1;
	  *jj=*jj+1;
	  
	  ((int16_t *)&txdataF[1][tti_offset])[0]+=-(int16_t)(((int32_t)amp*qam64_table[qam64_table_offset_re])>>15);
	  ((int16_t *)&txdataF[1][tti_offset])[1]+=(int16_t)(((int32_t)amp*qam64_table[qam64_table_offset_im])>>15);
	  
	  break;
	}
	// fill in the rest of the ALAMOUTI precoding
	if (is_not_pilot(pilots,re + 1,frame_parms->nushift,use2ndpilots)==1) {
	  ((int16_t *)&txdataF[0][tti_offset+1])[0] += -((int16_t *)&txdataF[1][tti_offset])[0]; //x1
	  ((int16_t *)&txdataF[0][tti_offset+1])[1] += ((int16_t *)&txdataF[1][tti_offset])[1];
	  ((int16_t *)&txdataF[1][tti_offset+1])[0] += ((int16_t *)&txdataF[0][tti_offset])[0];  //x0*
	  ((int16_t *)&txdataF[1][tti_offset+1])[1] += -((int16_t *)&txdataF[0][tti_offset])[1];
	}
	else {
	  ((int16_t *)&txdataF[0][tti_offset+2])[0] += -((int16_t *)&txdataF[1][tti_offset])[0]; //x1
	  ((int16_t *)&txdataF[0][tti_offset+2])[1] += ((int16_t *)&txdataF[1][tti_offset])[1];
	  ((int16_t *)&txdataF[1][tti_offset+2])[0] += ((int16_t *)&txdataF[0][tti_offset])[0];  //x0*
	  ((int16_t *)&txdataF[1][tti_offset+2])[1] += -((int16_t *)&txdataF[0][tti_offset])[1];
	}
      }
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      else if (mimo_mode == LARGE_CDD) {
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	*re_allocated = *re_allocated + 1;
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	if (frame_parms->nb_antennas_tx == 2) {
	  switch (mod_order0) {
	  default:
	    LOG_E(PHY,"Unknown mod_order0 %d\n",mod_order0);
	    xx0_re=xx0_im=0;
	    break;
	  case 2:  //QPSK
	    //	  printf("%d(%d) : %d,%d => ",tti_offset,*jj,((int16_t*)&txdataF[0][tti_offset])[0],((int16_t*)&txdataF[0][tti_offset])[1]);
	    xx0_re = (x0[*jj]==1) ? (-gain_lin_QPSK) : gain_lin_QPSK;
	    *jj = *jj + 1;
	    xx0_im = (x0[*jj]==1) ? (-gain_lin_QPSK) : gain_lin_QPSK;
	    *jj = *jj + 1;
	    


	    // printf("%d,%d\n",((int16_t*)&txdataF[0][tti_offset])[0],((int16_t*)&txdataF[0][tti_offset])[1]);
	    break;
	    
	  case 4:  //16QAM
	    
	    qam16_table_offset_re0 = 0;
	    qam16_table_offset_im0 = 0;
	    if (x0[*jj] == 1)
	      qam16_table_offset_re0+=2;
	    *jj=*jj+1;
	    if (x0[*jj] == 1)
	      qam16_table_offset_im0+=2;
	    *jj=*jj+1;
	    
	    if (x0[*jj] == 1)
	      qam16_table_offset_re0+=1;
	    *jj=*jj+1;
	    if (x0[*jj] == 1)
	      qam16_table_offset_im0+=1;
	    *jj=*jj+1;
	    
	    xx0_re = qam_table_s0[qam16_table_offset_re0];
	    xx0_im = qam_table_s0[qam16_table_offset_im0];

	    break;
	    
	  case 6:  //64QAM
	    
	    
	    qam64_table_offset_re0 = 0;
	    qam64_table_offset_im0 = 0;
	    
	    if (x0[*jj] == 1)
	      qam64_table_offset_re0+=4;
	    *jj=*jj+1;
	    if (x0[*jj] == 1)
	      qam64_table_offset_im0+=4;
	    *jj=*jj+1;
	    if (x0[*jj] == 1)
	      qam64_table_offset_re0+=2;
	    *jj=*jj+1;
	    if (x0[*jj] == 1)
	      qam64_table_offset_im0+=2;
	    *jj=*jj+1;
	    if (x0[*jj] == 1)
	      qam64_table_offset_re0+=1;
	    *jj=*jj+1;
	    if (x0[*jj] == 1)
	      qam64_table_offset_im0+=1;
	    *jj=*jj+1;

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	    xx0_re = qam_table_s0[qam64_table_offset_re0];
	    xx0_im = qam_table_s0[qam64_table_offset_im0];
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	    break;
	    
	  }
	  switch (mod_order1) {
	  default:
	    LOG_E(PHY,"Unknown mod_order1 %d\n",mod_order1);
	    xx1_re=xx1_im=0;
	    break;
	  case 2:  //QPSK
	    //	  printf("%d(%d) : %d,%d => ",tti_offset,*jj,((int16_t*)&txdataF[0][tti_offset])[0],((int16_t*)&txdataF[0][tti_offset])[1]);
	    xx1_re = (x1[*jj2]==1) ? (-gain_lin_QPSK) : gain_lin_QPSK; 
	    *jj2 = *jj2 + 1;
	    xx1_im = (x1[*jj2]==1) ? (-gain_lin_QPSK) : gain_lin_QPSK; 
	    *jj2 = *jj2 + 1;
	    // printf("%d,%d\n",((int16_t*)&txdataF[0][tti_offset])[0],((int16_t*)&txdataF[0][tti_offset])[1]);
	    break;
	    
	  case 4:  //16QAM
	    
	    qam16_table_offset_re1 = 0;
	    qam16_table_offset_im1 = 0;
	    if (x1[*jj2] == 1)
	      qam16_table_offset_re1+=2;
	    *jj2 = *jj2 + 1;
	    if (x1[*jj2] == 1)
	      qam16_table_offset_im1+=2;
	    *jj2 = *jj2 + 1;
	    if (x1[*jj2] == 1)
	      qam16_table_offset_re1+=1;
	    *jj2 = *jj2 + 1;
	    if (x1[*jj2] == 1)
	      qam16_table_offset_im1+=1;
	    *jj2 = *jj2 + 1;

	    xx1_re = qam_table_s1[qam16_table_offset_re1];
	    xx1_im = qam_table_s1[qam16_table_offset_im1];

	    break;
	    
	  case 6:  //64QAM
	    
	    qam64_table_offset_re1 = 0;
	    qam64_table_offset_im1 = 0;
	    
	    if (x1[*jj2] == 1)
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	      qam64_table_offset_re1+=4;
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	    *jj2 = *jj2 + 1;
	    if (x1[*jj2] == 1)
	      qam64_table_offset_im1+=4;
	    *jj2 = *jj2 + 1;
	    if (x1[*jj2] == 1)
	      qam64_table_offset_re1+=2;
	    *jj2 = *jj2 + 1;
	    if (x1[*jj2] == 1)
	      qam64_table_offset_im1+=2;
	    *jj2 = *jj2 + 1;
	    if (x1[*jj2] == 1)
	      qam64_table_offset_re1+=1;
	    *jj2 = *jj2 + 1;
	    if (x1[*jj2] == 1)
	      qam64_table_offset_im1+=1;
	    *jj2 = *jj2 + 1;

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	    xx1_re = qam_table_s1[qam64_table_offset_re1];
	    xx1_im = qam_table_s1[qam64_table_offset_im1];
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	    break;
	    
	  }

	  // This implements the Large CDD precoding for 2 TX antennas
	  // -  -        -    -  -         -  -     -  -  -       -              -
	  //| y0 |      | 1  0 || 1    0    || 1   1 || x0 |     |        x0 + x1 |
	  //| y1 | = .5 | 0  1 || 0  (-1)^i || 1  -1 || x1 | = .5| (-1)^i(x0 - x1)|
	  // -  -        -    -  -         -  -     -  -  -       - 
	  // Note: Factor .5 is accounted for in amplitude when calling this function
	  ((int16_t *)&txdataF[0][tti_offset])[0]+=((xx0_re+xx1_re)>>1);
	  ((int16_t *)&txdataF[1][tti_offset])[0]+=(s*((xx0_re-xx1_re)>>1));
	  ((int16_t *)&txdataF[0][tti_offset])[1]+=((xx0_im+xx1_im)>>1);
	  ((int16_t *)&txdataF[1][tti_offset])[1]+=(s*((xx0_im-xx1_im)>>1));
	  /*
	  printf("CDD: xx0 (%d,%d), xx1(%d,%d), s(%d), txF[0] (%d,%d), txF[1] (%d,%d)\n",
		 xx0_re,xx0_im,xx1_re,xx1_im, s, ((int16_t *)&txdataF[0][tti_offset])[0],((int16_t *)&txdataF[0][tti_offset])[1],
		 ((int16_t *)&txdataF[1][tti_offset])[0],((int16_t *)&txdataF[1][tti_offset])[1]);
	  */
	  // s alternates +1/-1 for each RE
	  s = -s;
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	}
      }
      else if ((mimo_mode >= UNIFORM_PRECODING11)&&(mimo_mode <= PUSCH_PRECODING1)) {
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	// this is for transmission modes 5-6 (1 layer)
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	*re_allocated = *re_allocated + 1;	         
	amp = (int16_t)(((int32_t)tmp_amp*ONE_OVER_SQRT2_Q15)>>15);
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	switch (mod_order0) {
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	case 2:  //QPSK

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	  ((int16_t*)&tmp_sample1)[0] = (x0[*jj]==1) ? (-gain_lin_QPSK) : gain_lin_QPSK;
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	  *jj = *jj + 1;
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	  ((int16_t*)&tmp_sample1)[1] = (x0[*jj]==1) ? (-gain_lin_QPSK) : gain_lin_QPSK;
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	  *jj = *jj + 1;

      // normalization for 2 tx antennas
	  ((int16_t*)&txdataF[0][tti_offset])[0] += (int16_t)((((int16_t*)&tmp_sample1)[0]*ONE_OVER_SQRT2_Q15)>>15);
	  ((int16_t*)&txdataF[0][tti_offset])[1] += (int16_t)((((int16_t*)&tmp_sample1)[1]*ONE_OVER_SQRT2_Q15)>>15);

	  if (frame_parms->nb_antennas_tx == 2) {
	    layer1prec2A(&tmp_sample1,&tmp_sample2,precoder_index);
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	    ((int16_t*)&txdataF[1][tti_offset])[0] += (int16_t)((((int16_t*)&tmp_sample2)[0]*ONE_OVER_SQRT2_Q15)>>15);
	    ((int16_t*)&txdataF[1][tti_offset])[1] += (int16_t)((((int16_t*)&tmp_sample2)[1]*ONE_OVER_SQRT2_Q15)>>15);
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	  }

	  break;
	  
	case 4:  //16QAM
	  
	  qam16_table_offset_re = 0;
	  qam16_table_offset_im = 0;

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	  if (x0[*jj] == 1)
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	    qam16_table_offset_re+=2;
	  *jj=*jj+1;
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	  if (x0[*jj] == 1)
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	    qam16_table_offset_im+=2;
	  *jj=*jj+1;
	  
	  
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	  if (x0[*jj] == 1)
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	    qam16_table_offset_re+=1;
	  *jj=*jj+1;
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	  if (x0[*jj] == 1)
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	    qam16_table_offset_im+=1;
	  *jj=*jj+1;
	  
	   ((int16_t*)&tmp_sample1)[0] = (int16_t)(((int32_t)amp*qam16_table[qam16_table_offset_re])>>15);
	   ((int16_t*)&tmp_sample1)[1] = (int16_t)(((int32_t)amp*qam16_table[qam16_table_offset_im])>>15);

	   ((int16_t *)&txdataF[0][tti_offset])[0] += ((int16_t*)&tmp_sample1)[0];
	   ((int16_t *)&txdataF[0][tti_offset])[1] += ((int16_t*)&tmp_sample1)[1];
	  
	  if (frame_parms->nb_antennas_tx == 2) {
	    layer1prec2A(&tmp_sample1,&tmp_sample2,precoder_index);
	    ((int16_t*)&txdataF[1][tti_offset])[0] += ((int16_t*)&tmp_sample2)[0];
	    ((int16_t*)&txdataF[1][tti_offset])[1] += ((int16_t*)&tmp_sample2)[1];
	  }

	  break;
	  
	case 6:  //64QAM
	  
	  
	  qam64_table_offset_re = 0;
	  qam64_table_offset_im = 0;
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	  if (x0[*jj] == 1)
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	    qam64_table_offset_re+=4;
	  *jj=*jj+1;
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	  if (x0[*jj] == 1)
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	    qam64_table_offset_im+=4;
	  *jj=*jj+1;
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	  if (x0[*jj] == 1)
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	    qam64_table_offset_re+=2;
	  *jj=*jj+1;
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	  if (x0[*jj] == 1)
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	    qam64_table_offset_im+=2;
	  *jj=*jj+1;
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	  if (x0[*jj] == 1)
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	    qam64_table_offset_re+=1;
	  *jj=*jj+1;
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	  if (x0[*jj] == 1)
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	    qam64_table_offset_im+=1;
	  *jj=*jj+1;
	  
	  ((int16_t*)&tmp_sample1)[0] = (int16_t)(((int32_t)amp*qam64_table[qam64_table_offset_re])>>15);
	  ((int16_t*)&tmp_sample1)[1] = (int16_t)(((int32_t)amp*qam64_table[qam64_table_offset_im])>>15);

	  ((int16_t *)&txdataF[0][tti_offset])[0] += ((int16_t*)&tmp_sample1)[0];
	  ((int16_t *)&txdataF[0][tti_offset])[1] += ((int16_t*)&tmp_sample1)[1];
	  
	  if (frame_parms->nb_antennas_tx == 2) {
	    layer1prec2A(&tmp_sample1,&tmp_sample2,precoder_index);
	    ((int16_t*)&txdataF[1][tti_offset])[0] += ((int16_t*)&tmp_sample2)[0];
	    ((int16_t*)&txdataF[1][tti_offset])[1] += ((int16_t*)&tmp_sample2)[1];
	  }
	  
	  break;
	  
	}
      }
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      else if ((mimo_mode >= DUALSTREAM_UNIFORM_PRECODING1)&&(mimo_mode <= DUALSTREAM_PUSCH_PRECODING)) {
	// this is for transmission mode 4 (1 layer)
	*re_allocated = *re_allocated + 1;	         
	//amp = (int16_t)(((int32_t)tmp_amp*ONE_OVER_SQRT2_Q15)>>15);
	amp = tmp_amp/2;
	gain_lin_QPSK = (int16_t)((amp*ONE_OVER_SQRT2_Q15)>>15);

	if (precoder_index==0) {
	  precoder_index0 = 0; //[1 1]
	  precoder_index1 = 1; //[1 -1]
	}
	else if (precoder_index==1) {
	  precoder_index0 = 2; //[1 j]
	  precoder_index1 = 3; //[1 -j]
	}
	else {
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	 printf("problem with precoder in TM4\n");
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	  return(-1);
	}

	switch (mod_order0) {
	case 2:  //QPSK

	  ((int16_t*)&tmp_sample1)[0] = (x0[*jj]==1) ? (-gain_lin_QPSK) : gain_lin_QPSK;
	  *jj = *jj + 1;
	  ((int16_t*)&tmp_sample1)[1] = (x0[*jj]==1) ? (-gain_lin_QPSK) : gain_lin_QPSK;
	  *jj = *jj + 1;

      // normalization for 2 tx antennas
	  ((int16_t*)&txdataF[0][tti_offset])[0] += ((int16_t*)&tmp_sample1)[0];
	  ((int16_t*)&txdataF[0][tti_offset])[1] += ((int16_t*)&tmp_sample1)[1];

	  if (frame_parms->nb_antennas_tx == 2) {
	    layer1prec2A(&tmp_sample1,&tmp_sample2,precoder_index0);
	    ((int16_t*)&txdataF[1][tti_offset])[0] += ((int16_t*)&tmp_sample2)[0];
	    ((int16_t*)&txdataF[1][tti_offset])[1] += ((int16_t*)&tmp_sample2)[1];
	  }

	  break;
	  
	case 4:  //16QAM
	  
	  qam16_table_offset_re = 0;
	  qam16_table_offset_im = 0;

	  if (x0[*jj] == 1)
	    qam16_table_offset_re+=2;
	  *jj=*jj+1;
	  if (x0[*jj] == 1)
	    qam16_table_offset_im+=2;
	  *jj=*jj+1;
	  
	  
	  if (x0[*jj] == 1)
	    qam16_table_offset_re+=1;
	  *jj=*jj+1;
	  if (x0[*jj] == 1)
	    qam16_table_offset_im+=1;
	  *jj=*jj+1;
	  
	   ((int16_t*)&tmp_sample1)[0] = (int16_t)(((int32_t)amp*qam16_table[qam16_table_offset_re])>>15);
	   ((int16_t*)&tmp_sample1)[1] = (int16_t)(((int32_t)amp*qam16_table[qam16_table_offset_im])>>15);

	   ((int16_t *)&txdataF[0][tti_offset])[0] += ((int16_t*)&tmp_sample1)[0];
	   ((int16_t *)&txdataF[0][tti_offset])[1] += ((int16_t*)&tmp_sample1)[1];
	  
	  if (frame_parms->nb_antennas_tx == 2) {
	    layer1prec2A(&tmp_sample1,&tmp_sample2,precoder_index0);
	    ((int16_t*)&txdataF[1][tti_offset])[0] += ((int16_t*)&tmp_sample2)[0];
	    ((int16_t*)&txdataF[1][tti_offset])[1] += ((int16_t*)&tmp_sample2)[1];
	  }

	  break;
	  
	case 6:  //64QAM
	  
	  
	  qam64_table_offset_re = 0;
	  qam64_table_offset_im = 0;
	  if (x0[*jj] == 1)
	    qam64_table_offset_re+=4;
	  *jj=*jj+1;
	  if (x0[*jj] == 1)
	    qam64_table_offset_im+=4;
	  *jj=*jj+1;
	  if (x0[*jj] == 1)
	    qam64_table_offset_re+=2;
	  *jj=*jj+1;
	  if (x0[*jj] == 1)
	    qam64_table_offset_im+=2;
	  *jj=*jj+1;
	  if (x0[*jj] == 1)
	    qam64_table_offset_re+=1;
	  *jj=*jj+1;
	  if (x0[*jj] == 1)
	    qam64_table_offset_im+=1;
	  *jj=*jj+1;
	  
	  ((int16_t*)&tmp_sample1)[0] = (int16_t)(((int32_t)amp*qam64_table[qam64_table_offset_re])>>15);
	  ((int16_t*)&tmp_sample1)[1] = (int16_t)(((int32_t)amp*qam64_table[qam64_table_offset_im])>>15);

	  ((int16_t *)&txdataF[0][tti_offset])[0] += ((int16_t*)&tmp_sample1)[0];
	  ((int16_t *)&txdataF[0][tti_offset])[1] += ((int16_t*)&tmp_sample1)[1];
	  
	  if (frame_parms->nb_antennas_tx == 2) {
	    layer1prec2A(&tmp_sample1,&tmp_sample2,precoder_index0);
	    ((int16_t*)&txdataF[1][tti_offset])[0] += ((int16_t*)&tmp_sample2)[0];
	    ((int16_t*)&txdataF[1][tti_offset])[1] += ((int16_t*)&tmp_sample2)[1];
	  }
	  
	  break;
	  
	}
	switch (mod_order1) {
	case 2:  //QPSK

	  ((int16_t*)&tmp_sample1)[0] = (x1[*jj2]==1) ? (-gain_lin_QPSK) : gain_lin_QPSK;
	  *jj2 = *jj2 + 1;
	  ((int16_t*)&tmp_sample1)[1] = (x1[*jj2]==1) ? (-gain_lin_QPSK) : gain_lin_QPSK;
	  *jj2 = *jj2 + 1;

      // normalization for 2 tx antennas
	  ((int16_t*)&txdataF[0][tti_offset])[0] += ((int16_t*)&tmp_sample1)[0];
	  ((int16_t*)&txdataF[0][tti_offset])[1] += ((int16_t*)&tmp_sample1)[1];

	  if (frame_parms->nb_antennas_tx == 2) {
	    layer1prec2A(&tmp_sample1,&tmp_sample2,precoder_index1);
	    ((int16_t*)&txdataF[1][tti_offset])[0] += ((int16_t*)&tmp_sample2)[0];
	    ((int16_t*)&txdataF[1][tti_offset])[1] += ((int16_t*)&tmp_sample2)[1];
	  }

	  break;
	  
	case 4:  //16QAM
	  
	  qam16_table_offset_re = 0;
	  qam16_table_offset_im = 0;

	  if (x1[*jj2] == 1)
	    qam16_table_offset_re+=2;
	  *jj2=*jj2+1;
	  if (x1[*jj2] == 1)
	    qam16_table_offset_im+=2;
	  *jj2=*jj2+1;
	  
	  
	  if (x1[*jj2] == 1)
	    qam16_table_offset_re+=1;
	  *jj2=*jj2+1;
	  if (x1[*jj2] == 1)
	    qam16_table_offset_im+=1;
	  *jj2=*jj2+1;
	  
	   ((int16_t*)&tmp_sample1)[0] = (int16_t)(((int32_t)amp*qam16_table[qam16_table_offset_re])>>15);
	   ((int16_t*)&tmp_sample1)[1] = (int16_t)(((int32_t)amp*qam16_table[qam16_table_offset_im])>>15);

	   ((int16_t *)&txdataF[0][tti_offset])[0] += ((int16_t*)&tmp_sample1)[0];
	   ((int16_t *)&txdataF[0][tti_offset])[1] += ((int16_t*)&tmp_sample1)[1];
	  
	  if (frame_parms->nb_antennas_tx == 2) {
	    layer1prec2A(&tmp_sample1,&tmp_sample2,precoder_index1);
	    ((int16_t*)&txdataF[1][tti_offset])[0] += ((int16_t*)&tmp_sample2)[0];
	    ((int16_t*)&txdataF[1][tti_offset])[1] += ((int16_t*)&tmp_sample2)[1];
	  }

	  break;
	  
	case 6:  //64QAM
	  
	  
	  qam64_table_offset_re = 0;
	  qam64_table_offset_im = 0;
	  if (x1[*jj2] == 1)
	    qam64_table_offset_re+=4;
	  *jj2=*jj2+1;
	  if (x1[*jj2] == 1)
	    qam64_table_offset_im+=4;
	  *jj2=*jj2+1;
	  if (x1[*jj2] == 1)
	    qam64_table_offset_re+=2;
	  *jj2=*jj2+1;
	  if (x1[*jj2] == 1)
	    qam64_table_offset_im+=2;
	  *jj2=*jj2+1;
	  if (x1[*jj2] == 1)
	    qam64_table_offset_re+=1;
	  *jj2=*jj2+1;
	  if (x1[*jj2] == 1)
	    qam64_table_offset_im+=1;
	  *jj2=*jj2+1;
	  
	  ((int16_t*)&tmp_sample1)[0] = (int16_t)(((int32_t)amp*qam64_table[qam64_table_offset_re])>>15);
	  ((int16_t*)&tmp_sample1)[1] = (int16_t)(((int32_t)amp*qam64_table[qam64_table_offset_im])>>15);

	  ((int16_t *)&txdataF[0][tti_offset])[0] += ((int16_t*)&tmp_sample1)[0];
	  ((int16_t *)&txdataF[0][tti_offset])[1] += ((int16_t*)&tmp_sample1)[1];
	  
	  if (frame_parms->nb_antennas_tx == 2) {
	    layer1prec2A(&tmp_sample1,&tmp_sample2,precoder_index1);
	    ((int16_t*)&txdataF[1][tti_offset])[0] += ((int16_t*)&tmp_sample2)[0];
	    ((int16_t*)&txdataF[1][tti_offset])[1] += ((int16_t*)&tmp_sample2)[1];
	  }
	  
	  break;
	  
	}
      }

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      if (mimo_mode == ALAMOUTI) {
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        re++;  // adjacent carriers are taken care of by precoding
        *re_allocated = *re_allocated + 1;

        if (is_not_pilot(pilots,re,frame_parms->nushift,use2ndpilots)==0) {
          re++;
          *re_allocated = *re_allocated + 1;
        }
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      }
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      if (mimo_mode >= TM8) { //TM8,TM9,TM10

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        if (is_not_UEspecRS(first_layer0,re)) {
          switch (mod_order0) {
          case 2:  //QPSK
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            //    printf("%d : %d,%d => ",tti_offset,((int16_t*)&txdataF[0][tti_offset])[0],((int16_t*)&txdataF[0][tti_offset])[1]);
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            for (int layer=first_layer0; layer<=(first_layer0+Nlayers0); layer++) {
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              ((int16_t*)&txdataF[layer][tti_offset])[0] = (x0[*jj]==1) ? (-gain_lin_QPSK) : gain_lin_QPSK; //I //b_i
              *jj = *jj + 1;
              ((int16_t*)&txdataF[layer][tti_offset])[1] = (x0[*jj]==1) ? (-gain_lin_QPSK) : gain_lin_QPSK; //Q //b_{i+1}
              *jj = *jj + 1;
            }
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            break;
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          case 4:  //16QAM
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            if (is_not_UEspecRS(0/*layer (FIXME uninitialized!)*/,re)) {
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              qam16_table_offset_re = 0;
              qam16_table_offset_im = 0;

              if (x0[*jj] == 1)
                qam16_table_offset_re+=2;

              *jj = *jj + 1;

              if (x0[*jj] == 1)
                qam16_table_offset_im+=2;

              *jj = *jj + 1;

              if (x0[*jj] == 1)
                qam16_table_offset_re+=1;

              *jj = *jj + 1;

              if (x0[*jj] == 1)
                qam16_table_offset_im+=1;

              *jj = *jj + 1;

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              for (int layer=first_layer0; layer<=(first_layer0+Nlayers0); layer++) {
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                ((int16_t*)&txdataF[layer][tti_offset])[0] = qam_table_s0[qam16_table_offset_re];
                ((int16_t*)&txdataF[layer][tti_offset])[1] = qam_table_s0[qam16_table_offset_im];
              }
            }

            break;

          case 6:  //64QAM


            qam64_table_offset_re = 0;
            qam64_table_offset_im = 0;

            if (x0[*jj] == 1)
              qam64_table_offset_re+=4;

            *jj = *jj + 1;

            if (x0[*jj] == 1)
              qam64_table_offset_im+=4;

            *jj = *jj + 1;

            if (x0[*jj] == 1)
              qam64_table_offset_re+=2;

            *jj = *jj + 1;

            if (x0[*jj] == 1)
              qam64_table_offset_im+=2;

            *jj = *jj + 1;

            if (x0[*jj] == 1)
              qam64_table_offset_re+=1;

            *jj = *jj + 1;

            if (x0[*jj] == 1)
              qam64_table_offset_im+=1;

            *jj = *jj + 1;

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            for (int layer=first_layer0; layer<=(first_layer0+Nlayers0); layer++) {
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              ((int16_t*)&txdataF[layer][tti_offset])[0] = qam_table_s0[qam64_table_offset_re];
              ((int16_t*)&txdataF[layer][tti_offset])[1] = qam_table_s0[qam64_table_offset_im];
            }

            break;

          }
        }
      } else if (mimo_mode>=TM9_10) {
        msg("allocate_REs_in_RB() [dlsch.c] : ERROR, unknown mimo_mode %d\n",mimo_mode);
        return(-1);
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      }
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    }
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  }
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  return(0);
}

int allocate_REs_in_RB_MCH(mod_sym_t **txdataF,
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                           uint32_t *jj,
                           uint16_t re_offset,
                           uint32_t symbol_offset,
                           uint8_t *x0,
                           uint8_t l,
                           uint8_t mod_order,
                           int16_t amp,
                           int16_t *qam_table_s,
                           uint32_t *re_allocated,
                           uint8_t skip_dc,
                           LTE_DL_FRAME_PARMS *frame_parms)
{
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  uint32_t tti_offset,aa;
  uint8_t re;
  uint8_t qam64_table_offset_re = 0;
  uint8_t qam64_table_offset_im = 0;
  uint8_t qam16_table_offset_re = 0;
  uint8_t qam16_table_offset_im = 0;
  int16_t gain_lin_QPSK;//,gain_lin_16QAM1,gain_lin_16QAM2;
  int16_t re_off=re_offset;
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  gain_lin_QPSK = (int16_t)((amp*ONE_OVER_SQRT2_Q15)>>15);
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  uint8_t first_re,last_re;
  int inc;
#ifdef DEBUG_DLSCH_MODULATION
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  printf("allocate_re_MCH (mod %d): symbol_offset %d re_offset %d (%d), jj %d -> %d,%d, gain_lin_QPSK %d,txdataF %p\n",mod_order,symbol_offset,re_offset,skip_dc,*jj, x0[*jj], x0[1+*jj],gain_lin_QPSK,&txdataF[0][symbol_offset]);
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#endif

  last_re=12;
  first_re=0;
  inc=1;
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  if ((l==2)||(l==10)) {
    inc=2;
    first_re=1;
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  } else if (l==6) {
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    inc=2;
  }
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  for (re=first_re; re<last_re; re+=inc) {

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    if ((skip_dc == 1) && (re==(6+first_re)))
      re_off=re_off - frame_parms->ofdm_symbol_size+1;
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    tti_offset = symbol_offset + re_off + re;
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    //    printf("re %d (jj %d)\n",re,*jj);
    *re_allocated = *re_allocated + 1;
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    switch (mod_order) {
    case 2:  //QPSK
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      //            printf("%d : %d,%d => ",tti_offset,((int16_t*)&txdataF[0][tti_offset])[0],((int16_t*)&txdataF[0][tti_offset])[1]);
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      for (aa=0; aa<frame_parms->nb_antennas_tx; aa++)
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        ((int16_t*)&txdataF[aa][tti_offset])[0] += (x0[*jj]==1) ? (-gain_lin_QPSK) : gain_lin_QPSK; //I //b_i

      *jj = *jj + 1;

      for (aa=0; aa<frame_parms->nb_antennas_tx; aa++)
        ((int16_t*)&txdataF[aa][tti_offset])[1] += (x0[*jj]==1) ? (-gain_lin_QPSK) : gain_lin_QPSK; //Q //b_{i+1}

      *jj = *jj + 1;

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      //      printf("%d,%d\n",((int16_t*)&txdataF[0][tti_offset])[0],((int16_t*)&txdataF[0][tti_offset])[1]);
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      break;

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    case 4:  //16QAM
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      qam16_table_offset_re = 0;
      qam16_table_offset_im = 0;
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      if (x0[*jj] == 1)
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        qam16_table_offset_re+=2;

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      *jj=*jj+1;
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      if (x0[*jj] == 1)
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        qam16_table_offset_im+=2;

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      *jj=*jj+1;
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      if (x0[*jj] == 1)
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        qam16_table_offset_re+=1;

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      *jj=*jj+1;
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      if (x0[*jj] == 1)
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        qam16_table_offset_im+=1;

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      *jj=*jj+1;
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      for (aa=0; aa<frame_parms->nb_antennas_tx; aa++) {
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        ((int16_t *)&txdataF[aa][tti_offset])[0]+=qam_table_s[qam16_table_offset_re];
        ((int16_t *)&txdataF[aa][tti_offset])[1]+=qam_table_s[qam16_table_offset_im];
        //      ((int16_t *)&txdataF[aa][tti_offset])[0]+=(int16_t)(((int32_t)amp*qam16_table[qam16_table_offset_re])>>15);
        //      ((int16_t *)&txdataF[aa][tti_offset])[1]+=(int16_t)(((int32_t)amp*qam16_table[qam16_table_offset_im])>>15);
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      }
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      break;
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    case 6:  //64QAM
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      qam64_table_offset_re = 0;
      qam64_table_offset_im = 0;
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      if (x0[*jj] == 1)
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        qam64_table_offset_re+=4;

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      *jj=*jj+1;
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      if (x0[*jj] == 1)
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        qam64_table_offset_im+=4;

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      *jj=*jj+1;
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      if (x0[*jj] == 1)
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        qam64_table_offset_re+=2;

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      *jj=*jj+1;
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      if (x0[*jj] == 1)
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        qam64_table_offset_im+=2;

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      *jj=*jj+1;
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      if (x0[*jj] == 1)
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        qam64_table_offset_re+=1;

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      *jj=*jj+1;
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      if (x0[*jj] == 1)
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        qam64_table_offset_im+=1;

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      *jj=*jj+1;
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      for (aa=0; aa<frame_parms->nb_antennas_tx; aa++) {
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        ((int16_t *)&txdataF[aa][tti_offset])[0]+=qam_table_s[qam64_table_offset_re];//(int16_t)(((int32_t)amp*qam64_table[qam64_table_offset_re])>>15);
        ((int16_t *)&txdataF[aa][tti_offset])[1]+=qam_table_s[qam64_table_offset_im];//(int16_t)(((int32_t)amp*qam64_table[qam64_table_offset_im])>>15);
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      }
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      break;
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    }
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  }

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  return(0);
}

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uint8_t get_pmi(uint8_t N_RB_DL,LTE_DL_eNB_HARQ_t *dlsch_harq,uint16_t rb)
{
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  MIMO_mode_t mode   = dlsch_harq->mimo_mode;
  uint32_t pmi_alloc = dlsch_harq->pmi_alloc;
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 printf("Getting pmi for RB %d => %d\n",rb,((pmi_alloc>>rb)&1));
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  switch (N_RB_DL) {
  case 6:   // 1 PRB per subband
    if (mode <= PUSCH_PRECODING1)
      return((pmi_alloc>>(rb<<1))&3);
    else
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      return((pmi_alloc>>rb)&1);

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    break;
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  default:
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  case 25:  // 4 PRBs per subband
    if (mode <= PUSCH_PRECODING1)
      return((pmi_alloc>>((rb>>2)<<1))&3);
    else
      return((pmi_alloc>>(rb>>2))&1);
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    break;
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  case 50: // 6 PRBs per subband
    if (mode <= PUSCH_PRECODING1)
      return((pmi_alloc>>((rb/6)<<1))&3);
    else
      return((pmi_alloc>>(rb/6))&1);
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    break;
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  case 100: // 8 PRBs per subband
    if (mode <= PUSCH_PRECODING1)
      return((pmi_alloc>>((rb>>3)<<1))&3);
    else
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      return((pmi_alloc>>(rb>>3))&1);

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    break;
  }
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}

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int dlsch_modulation(mod_sym_t **txdataF,
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                     int16_t amp,
                     uint32_t subframe_offset,
                     LTE_DL_FRAME_PARMS *frame_parms,
                     uint8_t num_pdcch_symbols,
                     LTE_eNB_DLSCH_t *dlsch0,
                     LTE_eNB_DLSCH_t *dlsch1)
{
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  uint8_t nsymb;
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  uint8_t harq_pid = dlsch0->current_harq_pid;
  LTE_DL_eNB_HARQ_t *dlsch0_harq = dlsch0->harq_processes[harq_pid];
  LTE_DL_eNB_HARQ_t *dlsch1_harq; //= dlsch1->harq_processes[harq_pid];
  uint32_t i,jj,jj2,re_allocated,symbol_offset;
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  uint16_t l,rb,re_offset;
  uint32_t rb_alloc_ind;
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  uint32_t *rb_alloc = dlsch0_harq->rb_alloc;
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  uint8_t pilots=0;
  uint8_t skip_dc,skip_half;
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  uint8_t mod_order0 = get_Qm(dlsch0_harq->mcs);
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  uint8_t mod_order1 = 0;
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  int16_t amp_rho_a, amp_rho_b;
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  int16_t qam16_table_a0[4],qam64_table_a0[8],qam16_table_b0[4],qam64_table_b0[8];
  int16_t qam16_table_a1[4],qam64_table_a1[8],qam16_table_b1[4],qam64_table_b1[8];
  int16_t *qam_table_s0,*qam_table_s1;
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#ifdef DEBUG_DLSCH_MODULATION
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  uint8_t Nl0 = dlsch0_harq->Nl;
  uint8_t Nl1;
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#endif