dlsch_modulation.c 67.2 KB
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/*
 * Licensed to the OpenAirInterface (OAI) Software Alliance under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The OpenAirInterface Software Alliance licenses this file to You under
 * the OAI Public License, Version 1.0  (the "License"); you may not use this file
 * except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.openairinterface.org/?page_id=698
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *-------------------------------------------------------------------------------
 * For more information about the OpenAirInterface (OAI) Software Alliance:
 *      contact@openairinterface.org
 */
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/*! \file PHY/LTE_TRANSPORT/dlsch_modulation.c
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 * \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
 */
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#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)
{
  return(1);
}*/
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uint8_t is_not_UEspecRS(int8_t lprime, uint8_t re, uint8_t nushift, uint8_t Ncp, uint8_t beamforming_mode)
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{
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  uint8_t offset = (lprime==1||lprime==3)?2:0;
  if (lprime==-1)
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    return(1);

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  switch (beamforming_mode) {
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    case 7:
      if (Ncp == NORMAL){
        if ((re!=nushift+offset) && (re!=((nushift+4+offset)%12)) &&  (re!=((nushift+8+offset)%12))) 
          return(1);
        /*else{
          printf("(is_no_UEspec_RS):lprime=%d, re=%d, nushift=%d, offset=%d\n",lprime, re,nushift,offset);
        }*/
      } else { 
        if ((re!=nushift+offset) && (re!=((nushift+3+offset)%12)) && (re!=((nushift+6+offset)%12)) && (re!=((nushift+9+offset)%12)))
          return(1);
      }
      break;

    default:
      msg("is_not_UEspecRS() [dlsch_modulation.c] : ERROR, unknown beamforming_mode %d\n",beamforming_mode);
      return(-1);
  }
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  return(0);
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}

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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) {

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

  // normalize
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  /*  ((int16_t *)antenna0_sample)[0] = (int16_t)((((int16_t *)antenna0_sample)[0]*ONE_OVER_SQRT2_Q15)>>15);
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      ((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);
      ((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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uint32_t FOUR[2]={0,4};
uint32_t TWO[2]={0,2};

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int allocate_REs_in_RB_no_pilots_16QAM_siso(PHY_VARS_eNB* phy_vars_eNB,
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					    int **txdataF,
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					    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 lprime,
					    uint8_t mprime,
					    uint8_t Ns,
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					    int *P1_SHIFT,
					    int *P2_SHIFT)
{

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  LTE_DL_FRAME_PARMS *frame_parms = &phy_vars_eNB->frame_parms;
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  uint8_t *x0             = dlsch0_harq->e;
  uint32_t qam16_table_offset_re = 0;
  uint32_t qam16_table_offset_im = 0;

  uint32_t tti_offset;
  uint8_t re;
  uint8_t *x0p;

  if (skip_dc == 0) {
    for (x0p=&x0[*jj],tti_offset=symbol_offset+re_offset,re=0; 
	 re<12; 
	 re++,x0p+=4,tti_offset++) {
      
      qam16_table_offset_re=TWO[x0p[0]];
      qam16_table_offset_im=TWO[x0p[1]];
      qam16_table_offset_re+=x0p[2];
      qam16_table_offset_im+=x0p[3];
      ((int16_t *)&txdataF[0][tti_offset])[0]=qam_table_s0[qam16_table_offset_re];
      ((int16_t *)&txdataF[0][tti_offset])[1]=qam_table_s0[qam16_table_offset_im];
    }
  }
  else {
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    // 1st half of PRB   
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    for (x0p=&x0[*jj],tti_offset=symbol_offset+re_offset,re=0; 
	 re<6; 
	 re++,x0p+=4,tti_offset++) {
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      qam16_table_offset_re=TWO[x0p[0]];
      qam16_table_offset_im=TWO[x0p[1]];
      qam16_table_offset_re+=x0p[2];
      qam16_table_offset_im+=x0p[3];
      ((int16_t *)&txdataF[0][tti_offset])[0]=qam_table_s0[qam16_table_offset_re];
      ((int16_t *)&txdataF[0][tti_offset])[1]=qam_table_s0[qam16_table_offset_im];
    }
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    // 2nd half of PRB   
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    for (tti_offset=symbol_offset+re_offset-frame_parms->ofdm_symbol_size+7; 
	 re<12; 
	 re++,x0p+=4,tti_offset++) {
      
      qam16_table_offset_re=TWO[x0p[0]];
      qam16_table_offset_im=TWO[x0p[1]];
      qam16_table_offset_re+=x0p[2];
      qam16_table_offset_im+=x0p[3];
      ((int16_t *)&txdataF[0][tti_offset])[0]=qam_table_s0[qam16_table_offset_re];
      ((int16_t *)&txdataF[0][tti_offset])[1]=qam_table_s0[qam16_table_offset_im];
    }
  }
  *re_allocated = *re_allocated + 12;
  *jj=*jj + 48;
    
    return(0);
}

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int allocate_REs_in_RB_pilots_16QAM_siso(PHY_VARS_eNB* phy_vars_eNB,
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					 int **txdataF,
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					 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 lprime,
					 uint8_t mprime,
					 uint8_t Ns,
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					 int *P1_SHIFT,
					 int *P2_SHIFT)
{
  
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  LTE_DL_FRAME_PARMS *frame_parms=&phy_vars_eNB->frame_parms;
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  uint8_t *x0             = dlsch0_harq->e;
  uint32_t qam16_table_offset_re = 0;
  uint32_t qam16_table_offset_im = 0;

  uint32_t tti_offset;
  uint8_t re;
  uint8_t *x0p;


  if (skip_dc == 0) {
    //    printf("pilots: P1_SHIFT[0] %d\n",P1_SHIFT[0]);
    for (x0p=&x0[*jj],tti_offset=symbol_offset+re_offset+P1_SHIFT[0],re=P1_SHIFT[0]; 
	 re<12; 
	 x0p+=4) {
      
      qam16_table_offset_re=TWO[x0p[0]];
      qam16_table_offset_im=TWO[x0p[1]];
      qam16_table_offset_re+=x0p[2];
      qam16_table_offset_im+=x0p[3];
      ((int16_t *)&txdataF[0][tti_offset])[0]=qam_table_s0[qam16_table_offset_re];
      ((int16_t *)&txdataF[0][tti_offset])[1]=qam_table_s0[qam16_table_offset_im];
      //      printf("pilots: re %d, tti_offset %d, P1_SHIFT %d\n",re,tti_offset,P1_SHIFT[re+1]);
      tti_offset+=P1_SHIFT[re+1];
      re+=P1_SHIFT[re+1];
    }
  }
  else {
    for (x0p=&x0[*jj],tti_offset=symbol_offset+re_offset+P1_SHIFT[0],re=P1_SHIFT[0]; 
	 re<6; 
	 x0p+=4) {
      
      qam16_table_offset_re=TWO[x0p[0]];
      qam16_table_offset_im=TWO[x0p[1]];
      qam16_table_offset_re+=x0p[2];
      qam16_table_offset_im+=x0p[3];
      ((int16_t *)&txdataF[0][tti_offset])[0]=qam_table_s0[qam16_table_offset_re];
      ((int16_t *)&txdataF[0][tti_offset])[1]=qam_table_s0[qam16_table_offset_im];
      tti_offset+=P1_SHIFT[re+1];
      re+=P1_SHIFT[re+1];
    }

    for (tti_offset=symbol_offset+re_offset-frame_parms->ofdm_symbol_size+6+P1_SHIFT[6]; 
	 re<12; 
	 x0p+=4) {
      
      qam16_table_offset_re=TWO[x0p[0]];
      qam16_table_offset_im=TWO[x0p[1]];
      qam16_table_offset_re+=x0p[2];
      qam16_table_offset_im+=x0p[3];
      ((int16_t *)&txdataF[0][tti_offset])[0]=qam_table_s0[qam16_table_offset_re];
      ((int16_t *)&txdataF[0][tti_offset])[1]=qam_table_s0[qam16_table_offset_im];
      tti_offset+=P1_SHIFT[re+1];
      re+=P1_SHIFT[re+1];
    }
  }
  *re_allocated = *re_allocated + 10;
  *jj=*jj + 40;

  return(0);
}

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int allocate_REs_in_RB_no_pilots_64QAM_siso(PHY_VARS_eNB* phy_vars_eNB,
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					    int **txdataF,
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					    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 lprime,
					    uint8_t mprime,
					    uint8_t Ns,
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					    int *P1_SHIFT,
					    int *P2_SHIFT)
{

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  LTE_DL_FRAME_PARMS *frame_parms = &phy_vars_eNB->frame_parms;
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  uint8_t *x0             = dlsch0_harq->e;
  uint32_t qam64_table_offset_re = 0;
  uint32_t qam64_table_offset_im = 0;

  uint32_t tti_offset;
  uint8_t re;
  uint8_t *x0p;

  if (skip_dc == 0) {

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    x0p=&x0[*jj],tti_offset=symbol_offset+re_offset;
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    /*    for (x0p=&x0[*jj],tti_offset=symbol_offset+re_offset,re=0; 
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	 re<12; 
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	 re+=4,x0p+=24,tti_offset+=4) {*/
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      qam64_table_offset_re=(x0p[0]<<2)|(x0p[2]<<1)|x0p[4];
      qam64_table_offset_im=(x0p[1]<<2)|(x0p[3]<<1)|x0p[5];
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      ((int16_t *)&txdataF[0][tti_offset])[0]=qam_table_s0[qam64_table_offset_re];
      ((int16_t *)&txdataF[0][tti_offset])[1]=qam_table_s0[qam64_table_offset_im];
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      qam64_table_offset_re=(x0p[6]<<2)|(x0p[8]<<1)|x0p[10];
      qam64_table_offset_im=(x0p[7]<<2)|(x0p[9]<<1)|x0p[11];
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      ((int16_t *)&txdataF[0][tti_offset])[2]=qam_table_s0[qam64_table_offset_re];
      ((int16_t *)&txdataF[0][tti_offset])[3]=qam_table_s0[qam64_table_offset_im];

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      qam64_table_offset_re=(x0p[12]<<2)|(x0p[14]<<1)|x0p[16];
      qam64_table_offset_im=(x0p[13]<<2)|(x0p[15]<<1)|x0p[17];
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      ((int16_t *)&txdataF[0][tti_offset])[4]=qam_table_s0[qam64_table_offset_re];
      ((int16_t *)&txdataF[0][tti_offset])[5]=qam_table_s0[qam64_table_offset_im];

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      qam64_table_offset_re=(x0p[18]<<2)|(x0p[20]<<1)|x0p[22];
      qam64_table_offset_im=(x0p[19]<<2)|(x0p[21]<<1)|x0p[23];
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      ((int16_t *)&txdataF[0][tti_offset])[6]=qam_table_s0[qam64_table_offset_re];
      ((int16_t *)&txdataF[0][tti_offset])[7]=qam_table_s0[qam64_table_offset_im];
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      qam64_table_offset_re=(x0p[24]<<2)|(x0p[26]<<1)|x0p[28];
      qam64_table_offset_im=(x0p[25]<<2)|(x0p[27]<<1)|x0p[29];
      ((int16_t *)&txdataF[0][tti_offset])[8]=qam_table_s0[qam64_table_offset_re];
      ((int16_t *)&txdataF[0][tti_offset])[9]=qam_table_s0[qam64_table_offset_im];

      qam64_table_offset_re=(x0p[30]<<2)|(x0p[32]<<1)|x0p[34];
      qam64_table_offset_im=(x0p[31]<<2)|(x0p[33]<<1)|x0p[35];
      ((int16_t *)&txdataF[0][tti_offset])[10]=qam_table_s0[qam64_table_offset_re];
      ((int16_t *)&txdataF[0][tti_offset])[11]=qam_table_s0[qam64_table_offset_im];

      qam64_table_offset_re=(x0p[36]<<2)|(x0p[38]<<1)|x0p[40];
      qam64_table_offset_im=(x0p[37]<<2)|(x0p[39]<<1)|x0p[41];
      ((int16_t *)&txdataF[0][tti_offset])[12]=qam_table_s0[qam64_table_offset_re];
      ((int16_t *)&txdataF[0][tti_offset])[13]=qam_table_s0[qam64_table_offset_im];

      qam64_table_offset_re=(x0p[42]<<2)|(x0p[44]<<1)|x0p[46];
      qam64_table_offset_im=(x0p[43]<<2)|(x0p[45]<<1)|x0p[47];
      ((int16_t *)&txdataF[0][tti_offset])[14]=qam_table_s0[qam64_table_offset_re];
      ((int16_t *)&txdataF[0][tti_offset])[15]=qam_table_s0[qam64_table_offset_im];

      qam64_table_offset_re=(x0p[48]<<2)|(x0p[50]<<1)|x0p[52];
      qam64_table_offset_im=(x0p[49]<<2)|(x0p[51]<<1)|x0p[53];
      ((int16_t *)&txdataF[0][tti_offset])[16]=qam_table_s0[qam64_table_offset_re];
      ((int16_t *)&txdataF[0][tti_offset])[17]=qam_table_s0[qam64_table_offset_im];

      qam64_table_offset_re=(x0p[54]<<2)|(x0p[56]<<1)|x0p[58];
      qam64_table_offset_im=(x0p[55]<<2)|(x0p[57]<<1)|x0p[59];
      ((int16_t *)&txdataF[0][tti_offset])[18]=qam_table_s0[qam64_table_offset_re];
      ((int16_t *)&txdataF[0][tti_offset])[19]=qam_table_s0[qam64_table_offset_im];

      qam64_table_offset_re=(x0p[60]<<2)|(x0p[62]<<1)|x0p[64];
      qam64_table_offset_im=(x0p[61]<<2)|(x0p[63]<<1)|x0p[65];
      ((int16_t *)&txdataF[0][tti_offset])[20]=qam_table_s0[qam64_table_offset_re];
      ((int16_t *)&txdataF[0][tti_offset])[21]=qam_table_s0[qam64_table_offset_im];

      qam64_table_offset_re=(x0p[66]<<2)|(x0p[68]<<1)|x0p[70];
      qam64_table_offset_im=(x0p[67]<<2)|(x0p[69]<<1)|x0p[71];
      ((int16_t *)&txdataF[0][tti_offset])[22]=qam_table_s0[qam64_table_offset_re];
      ((int16_t *)&txdataF[0][tti_offset])[23]=qam_table_s0[qam64_table_offset_im];


      //    }
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  }
  else {
    for (x0p=&x0[*jj],tti_offset=symbol_offset+re_offset,re=0; 
	 re<6; 
	 re++,x0p+=6,tti_offset++) {
      
      qam64_table_offset_re=FOUR[x0p[0]];
      qam64_table_offset_im=FOUR[x0p[1]];
      qam64_table_offset_re+=TWO[x0p[2]];
      qam64_table_offset_im+=TWO[x0p[3]];
      qam64_table_offset_re+=x0p[4];
      qam64_table_offset_im+=x0p[5];
      ((int16_t *)&txdataF[0][tti_offset])[0]=qam_table_s0[qam64_table_offset_re];
      ((int16_t *)&txdataF[0][tti_offset])[1]=qam_table_s0[qam64_table_offset_im];
    }

    for (tti_offset=symbol_offset+re_offset-frame_parms->ofdm_symbol_size+7; 
	 re<12; 
	 re++,x0p+=6,tti_offset++) {
      
      qam64_table_offset_re=FOUR[x0p[0]];
      qam64_table_offset_im=FOUR[x0p[1]];
      qam64_table_offset_re+=TWO[x0p[2]];
      qam64_table_offset_im+=TWO[x0p[3]];
      qam64_table_offset_re+=x0p[4];
      qam64_table_offset_im+=x0p[5];
      ((int16_t *)&txdataF[0][tti_offset])[0]=qam_table_s0[qam64_table_offset_re];
      ((int16_t *)&txdataF[0][tti_offset])[1]=qam_table_s0[qam64_table_offset_im];
    }
  }

  *re_allocated = *re_allocated + 12;
  *jj=*jj + 72;
    
  return(0);
}

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int allocate_REs_in_RB_pilots_64QAM_siso(PHY_VARS_eNB* phy_vars_eNB,
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					 int **txdataF,
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					 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 lprime,
					 uint8_t mprime,
					 uint8_t Ns,
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					 int *P1_SHIFT,
					 int *P2_SHIFT)
{
  
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  LTE_DL_FRAME_PARMS *frame_parms=&phy_vars_eNB->frame_parms;
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  uint8_t *x0             = dlsch0_harq->e;
  uint32_t qam64_table_offset_re = 0;
  uint32_t qam64_table_offset_im = 0;

  uint32_t tti_offset;
  uint8_t re;
  uint8_t *x0p;


  if (skip_dc == 0) {
    //    printf("pilots: P1_SHIFT[0] %d\n",P1_SHIFT[0]);
    for (x0p=&x0[*jj],tti_offset=symbol_offset+re_offset+P1_SHIFT[0],re=P1_SHIFT[0]; 
	 re<12; 
	 x0p+=6) {
      
      qam64_table_offset_re=FOUR[x0p[0]];
      qam64_table_offset_im=FOUR[x0p[1]];
      qam64_table_offset_re+=TWO[x0p[2]];
      qam64_table_offset_im+=TWO[x0p[3]];
      qam64_table_offset_re+=x0p[4];
      qam64_table_offset_im+=x0p[5];
      ((int16_t *)&txdataF[0][tti_offset])[0]=qam_table_s0[qam64_table_offset_re];
      ((int16_t *)&txdataF[0][tti_offset])[1]=qam_table_s0[qam64_table_offset_im];
      //      printf("pilots: re %d, tti_offset %d, P1_SHIFT %d\n",re,tti_offset,P1_SHIFT[re+1]);
      tti_offset+=P1_SHIFT[re+1];
      re+=P1_SHIFT[re+1];
    }
  }
  else {
    for (x0p=&x0[*jj],tti_offset=symbol_offset+re_offset+P1_SHIFT[0],re=P1_SHIFT[0]; 
	 re<6; 
	 x0p+=6) {
      
      qam64_table_offset_re=FOUR[x0p[0]];
      qam64_table_offset_im=FOUR[x0p[1]];
      qam64_table_offset_re+=TWO[x0p[2]];
      qam64_table_offset_im+=TWO[x0p[3]];
      qam64_table_offset_re+=x0p[4];
      qam64_table_offset_im+=x0p[5];
      ((int16_t *)&txdataF[0][tti_offset])[0]=qam_table_s0[qam64_table_offset_re];
      ((int16_t *)&txdataF[0][tti_offset])[1]=qam_table_s0[qam64_table_offset_im];
      tti_offset+=P1_SHIFT[re+1];
      re+=P1_SHIFT[re+1];
    }

    for (tti_offset=symbol_offset+re_offset-frame_parms->ofdm_symbol_size+6+P1_SHIFT[6]; 
	 re<12; 
	 x0p+=6) {
      
      qam64_table_offset_re=FOUR[x0p[0]];
      qam64_table_offset_im=FOUR[x0p[1]];
      qam64_table_offset_re+=TWO[x0p[2]];
      qam64_table_offset_im+=TWO[x0p[3]];
      qam64_table_offset_re+=x0p[4];
      qam64_table_offset_im+=x0p[5];
      ((int16_t *)&txdataF[0][tti_offset])[0]=qam_table_s0[qam64_table_offset_re];
      ((int16_t *)&txdataF[0][tti_offset])[1]=qam_table_s0[qam64_table_offset_im];
      tti_offset+=P1_SHIFT[re+1];
      re+=P1_SHIFT[re+1];
    }
  }
  *re_allocated = *re_allocated + 10;
  *jj=*jj + 60;

  return(0);
}

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int allocate_REs_in_RB(PHY_VARS_eNB* phy_vars_eNB,
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                       int32_t **txdataF,
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                       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,
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                       uint8_t skip_half,
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		       uint8_t lprime,
		       uint8_t mprime,
		       uint8_t Ns,
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		       int *P1_SHIFT,
		       int *P2_SHIFT)
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{
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  LTE_DL_FRAME_PARMS *frame_parms = &phy_vars_eNB->frame_parms;

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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 *x1=NULL;
  uint8_t mod_order1=2;
  // 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;
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  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;
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  int mprime2 = mprime,ind,ind_dword,ind_qpsk_symb;
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  gain_lin_QPSK = (int16_t)((amp*ONE_OVER_SQRT2_Q15)>>15);
  //  if (mimo_mode == LARGE_CDD) gain_lin_QPSK>>=1;

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  int32_t qpsk[4];
  ((int16_t *)&qpsk[0])[0] = gain_lin_QPSK;
  ((int16_t *)&qpsk[0])[1] = gain_lin_QPSK;
  ((int16_t *)&qpsk[1])[0] = -gain_lin_QPSK;
  ((int16_t *)&qpsk[1])[1] = gain_lin_QPSK;;
  ((int16_t *)&qpsk[2])[0] = gain_lin_QPSK;;
  ((int16_t *)&qpsk[2])[1] = -gain_lin_QPSK;;
  ((int16_t *)&qpsk[3])[0] = -gain_lin_QPSK;;
  ((int16_t *)&qpsk[3])[1] = -gain_lin_QPSK;

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  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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#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("re %d %d(%d) : %d,%d => ",re,tti_offset,*jj,((int16_t*)&txdataF[0][tti_offset])[0],((int16_t*)&txdataF[0][tti_offset])[1]);
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	  ((int16_t*)&txdataF[0][tti_offset])[0] += (x0[*jj]==1) ? (-gain_lin_QPSK) : gain_lin_QPSK; //I //b_i
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          *jj = *jj + 1;

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

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	  ((int16_t *)&txdataF[0][tti_offset])[0]+=qam_table_s0[qam16_table_offset_re];
	  ((int16_t *)&txdataF[0][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);
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          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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	  ((int16_t *)&txdataF[0][tti_offset])[0]+=qam_table_s0[qam64_table_offset_re];
	  ((int16_t *)&txdataF[0][tti_offset])[1]+=qam_table_s0[qam64_table_offset_im];
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          break;

        }
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      }
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      else if (mimo_mode == ALAMOUTI) {
        *re_allocated = *re_allocated + 1;

        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);
          ((int16_t*)&txdataF[0][tti_offset])[1] += (int16_t)((((int16_t*)&tmp_sample1)[1]*ONE_OVER_SQRT2_Q15)>>15);
          ((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);

          break;

        case 4:  //16QAM

          // Antenna 0 position n

          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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          //((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);
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	  ((int16_t *)&txdataF[0][tti_offset])[0]+=(qam_table_s0[qam16_table_offset_re]*ONE_OVER_SQRT2_Q15)>>15;
	  ((int16_t *)&txdataF[0][tti_offset])[1]+=(qam_table_s0[qam16_table_offset_im]*ONE_OVER_SQRT2_Q15)>>15;
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          // Antenna 1 position n Real part -> -x1*

          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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          //((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);
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	  ((int16_t *)&txdataF[1][tti_offset])[0]+=-(qam_table_s0[qam16_table_offset_re]*ONE_OVER_SQRT2_Q15)>>15;
	  ((int16_t *)&txdataF[1][tti_offset])[1]+=(qam_table_s0[qam16_table_offset_im]*ONE_OVER_SQRT2_Q15)>>15;
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          break;

        case 6:   // 64-QAM

          // Antenna 0
          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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          //((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);
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	  ((int16_t *)&txdataF[0][tti_offset])[0]+=(qam_table_s0[qam64_table_offset_re]*ONE_OVER_SQRT2_Q15)>>15;
	  ((int16_t *)&txdataF[0][tti_offset])[1]+=(qam_table_s0[qam64_table_offset_im]*ONE_OVER_SQRT2_Q15)>>15;
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          // Antenna 1 => -x1*
          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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          //((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);
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	  ((int16_t *)&txdataF[1][tti_offset])[0]+=-(qam_table_s0[qam64_table_offset_re]*ONE_OVER_SQRT2_Q15)>>15;
	  ((int16_t *)&txdataF[1][tti_offset])[1]+=(qam_table_s0[qam64_table_offset_im]*ONE_OVER_SQRT2_Q15)>>15;
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          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];
        }
      } else if (mimo_mode == LARGE_CDD) {

        *re_allocated = *re_allocated + 1;

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        if (frame_parms->nb_antenna_ports_eNB == 2) {
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          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;

            xx0_re = qam_table_s0[qam64_table_offset_re0];
            xx0_im = qam_table_s0[qam64_table_offset_im0];


            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)
              qam64_table_offset_re1+=4;

            *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;

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


            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;
        }
      } else if ((mimo_mode >= UNIFORM_PRECODING11)&&(mimo_mode <= PUSCH_PRECODING1)) {
        // this is for transmission modes 4-6 (1 layer)
        *re_allocated = *re_allocated + 1;
        amp = (int16_t)(((int32_t)tmp_amp*ONE_OVER_SQRT2_Q15)>>15);

        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)((((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);

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          if (frame_parms->nb_antenna_ports_eNB == 2) {
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            layer1prec2A(&tmp_sample1,&tmp_sample2,precoder_index);
            ((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);
          }

          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];

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          if (frame_parms->nb_antenna_ports_eNB == 2) {
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            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;

          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];

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          if (frame_parms->nb_antenna_ports_eNB == 2) {
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            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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	}
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      }

      if (mimo_mode == ALAMOUTI) {
        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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      if (mimo_mode == TM7) {
        *re_allocated = *re_allocated + 1;

        if (is_not_UEspecRS(lprime,re,frame_parms->Nid_cell%3,frame_parms->Ncp,7)) {

          switch (mod_order0){
            case 2:  //QPSK

              ((int16_t*)&txdataF[5][tti_offset])[0] = (x0[*jj]==1) ? (-gain_lin_QPSK) : gain_lin_QPSK;
              *jj = *jj + 1;
              ((int16_t*)&txdataF[5][tti_offset])[1] = (x0[*jj]==1) ? (-gain_lin_QPSK) : gain_lin_QPSK;
              *jj = *jj + 1;

              //printf("%d(%d) : %d,%d =>
              //",tti_offset,*jj,((int16_t*)&tmp_sample1)[0],((int16_t*)&tmp_sample1)[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*)&txdataF[5][tti_offset])[0] = (int16_t)(((int32_t)amp*qam16_table[qam16_table_offset_re])>>15);
              ((int16_t*)&txdataF[5][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;

              ((int16_t*)&txdataF[5][tti_offset])[0] = (int16_t)(((int32_t)amp*qam64_table[qam64_table_offset_re])>>15);
              ((int16_t*)&txdataF[5][tti_offset])[1] = (int16_t)(((int32_t)amp*qam64_table[qam64_table_offset_im])>>15);

              break;

          }
        } else {
          //precoding UE spec RS
          //printf("precoding UE spec RS\n");

          ind = 3*lprime*dlsch0_harq->nb_rb+mprime2;
          ind_dword = ind>>4;
          ind_qpsk_symb = ind&0xf;

          txdataF[5][tti_offset] = qpsk[(phy_vars_eNB->lte_gold_uespec_port5_table[0][Ns][ind_dword]>>(2*ind_qpsk_symb))&3];
          mprime2++;

        }
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      } else if (mimo_mode >= TM8) { //TM8,TM9,TM10
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	//uint8_t is_not_UEspecRS(int8_t lprime, uint8_t re, uint8_t nushift, uint8_t Ncp, uint8_t beamforming_mode)
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        if (is_not_UEspecRS(lprime,re,frame_parms->nushift,frame_parms->Ncp,8)) {
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          switch (mod_order0) {
          case 2:  //QPSK

            //    printf("%d : %d,%d => ",tti_offset,((int16_t*)&txdataF[0][tti_offset])[0],((int16_t*)&txdataF[0][tti_offset])[1]);
            for (int layer=first_layer0; layer<=(first_layer0+Nlayers0); layer++) {
              ((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;
            }

            break;

          case 4:  //16QAM
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            if (is_not_UEspecRS(lprime,re,frame_parms->nushift,frame_parms->Ncp,8)) {
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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;

              for (int layer=first_layer0; layer<=(first_layer0+Nlayers0); layer++) {
                ((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;

            for (int layer=first_layer0; layer<=(first_layer0+Nlayers0); layer++) {
              ((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;

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