dlsch_demodulation.c 121 KB
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/*******************************************************************************
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    OpenAirInterface 
    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
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    (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
    along with OpenAirInterface.The full GNU General Public License is 
   included in this distribution in the file called "COPYING". If not, 
   see <http://www.gnu.org/licenses/>.
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  Contact Information
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  OpenAirInterface Admin: openair_admin@eurecom.fr
  OpenAirInterface Tech : openair_tech@eurecom.fr
  OpenAirInterface Dev  : openair4g-devel@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_demodulation.c
 * \brief Top-level routines for demodulating the PDSCH physical channel from 36-211, V8.6 2009-03
 * \author R. Knopp, F. Kaltenberger,A. Bhamri, S. Aubert
 * \date 2011
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 DEBUG * \version 0.1
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 * \company Eurecom
 * \email: knopp@eurecom.fr,florian.kaltenberger@eurecom.fr,ankit.bhamri@eurecom.fr,sebastien.aubert@eurecom.fr
 * \note
 * \warning
 */

#include "PHY/defs.h"
#include "PHY/extern.h"
#include "defs.h"
#include "extern.h"
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#include "PHY/sse_intrin.h"
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#ifndef USER_MODE
#define NOCYGWIN_STATIC static
#else
#define NOCYGWIN_STATIC 
#endif

//#define DEBUG_PHY 1
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int avg[4];

// [MCS][i_mod (0,1,2) = (2,4,6)]
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unsigned char offset_mumimo_llr_drange_fix=0;
/*
//original values from sebastion + same hand tuning
unsigned char offset_mumimo_llr_drange[29][3]={{8,8,8},{7,7,7},{7,7,7},{7,7,7},{6,6,6},{6,6,6},{6,6,6},{5,5,5},{4,4,4},{1,2,4}, // QPSK
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{5,5,4},{5,5,5},{5,5,5},{3,3,3},{2,2,2},{2,2,2},{2,2,2}, // 16-QAM
{2,2,1},{3,3,3},{3,3,3},{3,3,1},{2,2,2},{2,2,2},{0,0,0},{0,0,0},{0,0,0},{0,0,0},{0,0,0},{0,0,0}}; //64-QAM
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*/
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 /*
 //first optimization try
 unsigned char offset_mumimo_llr_drange[29][3]={{7, 8, 7},{6, 6, 7},{6, 6, 7},{6, 6, 6},{5, 6, 6},{5, 5, 6},{5, 5, 6},{4, 5, 4},{4, 3, 4},{3, 2, 2},{6, 5, 5},{5, 4, 4},{5, 5, 4},{3, 3, 2},{2, 2, 1},{2, 1, 1},{2, 2, 2},{3, 3, 3},{3, 3, 2},{3, 3, 2},{3, 2, 1},{2, 2, 2},{2, 2, 2},{0, 0, 0},{0, 0, 0},{0, 0, 0},{0, 0, 0},{0, 0, 0}};
 */
 //second optimization try
 /*
   unsigned char offset_mumimo_llr_drange[29][3]={{5, 8, 7},{4, 6, 8},{3, 6, 7},{7, 7, 6},{4, 7, 8},{4, 7, 4},{6, 6, 6},{3, 6, 6},{3, 6, 6},{1, 3, 4},{1, 1, 0},{3, 3, 2},{3, 4, 1},{4, 0, 1},{4, 2, 2},{3, 1, 2},{2, 1, 0},{2, 1, 1},{1, 0, 1},{1, 0, 1},{0, 0, 0},{1, 0, 0},{0, 0, 0},{0, 1, 0},{1, 0, 0},{0, 0, 0},{0, 0, 0},{0, 0, 0},{0, 0, 0}};  w
 */
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unsigned char offset_mumimo_llr_drange[29][3]={{0, 6, 5},{0, 4, 5},{0, 4, 5},{0, 5, 4},{0, 5, 6},{0, 5, 3},{0, 4, 4},{0, 4, 4},{0, 3, 3},{0, 1, 2},{1, 1, 0},{1, 3, 2},{3, 4, 1},{2, 0, 0},{2, 2, 2},{1, 1, 1},{2, 1, 0},{2, 1, 1},{1, 0, 1},{1, 0, 1},{0, 0, 0},{1, 0, 0},{0, 0, 0},{0, 1, 0},{1, 0, 0},{0, 0, 0},{0, 0, 0},{0, 0, 0},{0, 0, 0}};

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extern void print_shorts(char *s,__m128i *x);

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int rx_pdsch(PHY_VARS_UE *phy_vars_ue,
             PDSCH_t type,
             unsigned char eNB_id,
             unsigned char eNB_id_i, //if this == phy_vars_ue->n_connected_eNB, we assume MU interference
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             uint8_t subframe,
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             unsigned char symbol,
             unsigned char first_symbol_flag,
             unsigned char dual_stream_flag,
             unsigned char i_mod,
             unsigned char harq_pid) {
  
  LTE_UE_COMMON *lte_ue_common_vars  = &phy_vars_ue->lte_ue_common_vars;
  LTE_UE_PDSCH **lte_ue_pdsch_vars;
  LTE_DL_FRAME_PARMS *frame_parms    = &phy_vars_ue->lte_frame_parms;
  PHY_MEASUREMENTS *phy_measurements = &phy_vars_ue->PHY_measurements;
  LTE_UE_DLSCH_t   **dlsch_ue;

  unsigned char aatx,aarx;    
  unsigned short nb_rb;
  int avgs, rb;  
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  LTE_DL_UE_HARQ_t *dlsch0_harq,*dlsch1_harq = 0;
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  switch (type) {
  case SI_PDSCH:
    lte_ue_pdsch_vars = &phy_vars_ue->lte_ue_pdsch_vars_SI[eNB_id];
    dlsch_ue          = &phy_vars_ue->dlsch_ue_SI[eNB_id];
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    dlsch0_harq       = dlsch_ue[0]->harq_processes[harq_pid];
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    break;
  case RA_PDSCH:
    lte_ue_pdsch_vars = &phy_vars_ue->lte_ue_pdsch_vars_ra[eNB_id];
    dlsch_ue          = &phy_vars_ue->dlsch_ue_ra[eNB_id];
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    dlsch0_harq       = dlsch_ue[0]->harq_processes[harq_pid];
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    break;
  case PDSCH:
    lte_ue_pdsch_vars = &phy_vars_ue->lte_ue_pdsch_vars[eNB_id];
    dlsch_ue          = phy_vars_ue->dlsch_ue[eNB_id];
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    dlsch0_harq       = dlsch_ue[0]->harq_processes[harq_pid];
    dlsch1_harq       = dlsch_ue[1]->harq_processes[harq_pid];
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    break;

  default:
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    LOG_E(PHY,"[UE %d][FATAL] Frame %d subframe %d: Unknown PDSCH format %d\n",phy_vars_ue->frame_rx,subframe,type);
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    return(-1);
    break;
  }
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  if (eNB_id > 2) {
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    LOG_W(PHY,"dlsch_demodulation.c: Illegal eNB_id %d\n",eNB_id);
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    return(-1);
  }
    
  if (!lte_ue_common_vars) {
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    LOG_W(PHY,"dlsch_demodulation.c: Null lte_ue_common_vars\n");
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    return(-1);
  }

  if (!dlsch_ue[0]) {
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    LOG_W(PHY,"dlsch_demodulation.c: Null dlsch_ue pointer\n");
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    return(-1);
  }

  if (!lte_ue_pdsch_vars) {
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    LOG_W(PHY,"dlsch_demodulation.c: Null lte_ue_pdsch_vars pointer\n");
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    return(-1);
  }
    
  if (!frame_parms) {
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    LOG_W(PHY,"dlsch_demodulation.c: Null lte_frame_parms\n");
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    return(-1);
  }
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  //  printf("rx_dlsch subframe %d symbol %d: eNB_id %d, eNB_id_i %d, dual_stream_flag %d\n",subframe,symbol,eNB_id,eNB_id_i,dual_stream_flag); 
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  //  symbol_mod = (symbol>=(7-frame_parms->Ncp)) ? symbol-(7-frame_parms->Ncp) : symbol;

  /*
    if ((symbol_mod == 0) || (symbol_mod == (4-frame_parms->Ncp)))
    pilots=1;
    else 
    pilots=0;
  */

  if (frame_parms->nb_antennas_tx_eNB>1) {
#ifdef DEBUG_DLSCH_MOD     
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    LOG_I(PHY,"dlsch: using pmi %x (%p), rb_alloc %x\n",pmi2hex_2Ar1(dlsch0_harq->pmi_alloc),dlsch_ue[0],dlsch0_harq->rb_alloc[0]);
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#endif
    nb_rb = dlsch_extract_rbs_dual(lte_ue_common_vars->rxdataF,
				   lte_ue_common_vars->dl_ch_estimates[eNB_id],
				   lte_ue_pdsch_vars[eNB_id]->rxdataF_ext,
				   lte_ue_pdsch_vars[eNB_id]->dl_ch_estimates_ext,
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				   dlsch0_harq->pmi_alloc,
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				   lte_ue_pdsch_vars[eNB_id]->pmi_ext,
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				   dlsch0_harq->rb_alloc,
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				   symbol,
				   subframe,
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				   phy_vars_ue->high_speed_flag,
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				   frame_parms);

    if (dual_stream_flag==1) {
      if (eNB_id_i<phy_vars_ue->n_connected_eNB)
	nb_rb = dlsch_extract_rbs_dual(lte_ue_common_vars->rxdataF,
				       lte_ue_common_vars->dl_ch_estimates[eNB_id_i],
				       lte_ue_pdsch_vars[eNB_id_i]->rxdataF_ext,
				       lte_ue_pdsch_vars[eNB_id_i]->dl_ch_estimates_ext,
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				       dlsch0_harq->pmi_alloc,
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				       lte_ue_pdsch_vars[eNB_id_i]->pmi_ext,
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				       dlsch0_harq->rb_alloc,
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				       symbol,
				       subframe,
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				       phy_vars_ue->high_speed_flag,
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				       frame_parms);
      else 
	nb_rb = dlsch_extract_rbs_dual(lte_ue_common_vars->rxdataF,
				       lte_ue_common_vars->dl_ch_estimates[eNB_id],
				       lte_ue_pdsch_vars[eNB_id_i]->rxdataF_ext,
				       lte_ue_pdsch_vars[eNB_id_i]->dl_ch_estimates_ext,
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				       dlsch0_harq->pmi_alloc,
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				       lte_ue_pdsch_vars[eNB_id_i]->pmi_ext,
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				       dlsch0_harq->rb_alloc,
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				       symbol,
				       subframe,
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				       phy_vars_ue->high_speed_flag,
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				       frame_parms);
    }
  } // if n_tx>1
  else {     
    nb_rb = dlsch_extract_rbs_single(lte_ue_common_vars->rxdataF,
				     lte_ue_common_vars->dl_ch_estimates[eNB_id],
				     lte_ue_pdsch_vars[eNB_id]->rxdataF_ext,
				     lte_ue_pdsch_vars[eNB_id]->dl_ch_estimates_ext,
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				     dlsch0_harq->pmi_alloc,
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				     lte_ue_pdsch_vars[eNB_id]->pmi_ext,
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				     dlsch0_harq->rb_alloc,
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				     symbol,
				     subframe,
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				     phy_vars_ue->high_speed_flag,
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				     frame_parms);
        
    if (dual_stream_flag==1) {
      if (eNB_id_i<phy_vars_ue->n_connected_eNB)
	nb_rb = dlsch_extract_rbs_single(lte_ue_common_vars->rxdataF,
					 lte_ue_common_vars->dl_ch_estimates[eNB_id_i],
					 lte_ue_pdsch_vars[eNB_id_i]->rxdataF_ext,
					 lte_ue_pdsch_vars[eNB_id_i]->dl_ch_estimates_ext,    
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					 dlsch0_harq->pmi_alloc,
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					 lte_ue_pdsch_vars[eNB_id_i]->pmi_ext,
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					 dlsch0_harq->rb_alloc,
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					 symbol,
					 subframe,
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					 phy_vars_ue->high_speed_flag,
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					 frame_parms);
      else 
	nb_rb = dlsch_extract_rbs_single(lte_ue_common_vars->rxdataF,
					 lte_ue_common_vars->dl_ch_estimates[eNB_id],
					 lte_ue_pdsch_vars[eNB_id_i]->rxdataF_ext,
					 lte_ue_pdsch_vars[eNB_id_i]->dl_ch_estimates_ext,    
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					 dlsch0_harq->pmi_alloc,
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					 lte_ue_pdsch_vars[eNB_id_i]->pmi_ext,
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					 dlsch0_harq->rb_alloc,
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					 symbol,
					 subframe,
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					 phy_vars_ue->high_speed_flag,
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					 frame_parms);
    }
  } //else n_tx>1
  
    //  printf("nb_rb = %d, eNB_id %d\n",nb_rb,eNB_id);
  if (nb_rb==0) {
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    LOG_W(PHY,"dlsch_demodulation.c: nb_rb=0\n");
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    return(-1);
  }
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  /*
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  // DL power control: Scaling of Channel estimates for PDSCH
  dlsch_scale_channel(lte_ue_pdsch_vars[eNB_id]->dl_ch_estimates_ext,
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  frame_parms,
  dlsch_ue,
  symbol,
  nb_rb);
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  */
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  if (first_symbol_flag==1) {
    dlsch_channel_level(lte_ue_pdsch_vars[eNB_id]->dl_ch_estimates_ext,
			frame_parms,
			avg,
			symbol,
			nb_rb);
#ifdef DEBUG_PHY
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    LOG_D(PHY,"[DLSCH] avg[0] %d\n",avg[0]);
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#endif
      
    // the channel gain should be the effective gain of precoding + channel
    // however lets be more conservative and set maxh = nb_tx*nb_rx*max(h_i)
    // in case of precoding we add an additional factor of two for the precoding gain
    avgs = 0;
    for (aatx=0;aatx<frame_parms->nb_antennas_tx_eNB;aatx++)
      for (aarx=0;aarx<frame_parms->nb_antennas_rx;aarx++)
	avgs = cmax(avgs,avg[(aatx<<1)+aarx]);
    //	avgs = cmax(avgs,avg[(aarx<<1)+aatx]);
        
    
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    lte_ue_pdsch_vars[eNB_id]->log2_maxh = (log2_approx(avgs)/2);
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    // + log2_approx(frame_parms->nb_antennas_tx_eNB-1) //-1 because log2_approx counts the number of bits
    //      + log2_approx(frame_parms->nb_antennas_rx-1);
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    if ((dlsch0_harq->mimo_mode>=UNIFORM_PRECODING11) &&
	(dlsch0_harq->mimo_mode< DUALSTREAM_UNIFORM_PRECODING1) &&
	(dlsch0_harq->dl_power_off==1)) // we are in TM 6
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      lte_ue_pdsch_vars[eNB_id]->log2_maxh++;

    // this version here applies the factor .5 also to the extra terms. however, it does not work so well as the one above
    /* K = Nb_rx         in TM1 
       Nb_tx*Nb_rx   in TM2,4,5
       Nb_tx^2*Nb_rx in TM6 */
    /*
      K = frame_parms->nb_antennas_rx*frame_parms->nb_antennas_tx_eNB; //that also covers TM1 since Nb_tx=1
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      if ((dlsch0_harq->mimo_mode>=UNIFORM_PRECODING11) &&
      (dlsch0_harq->mimo_mode< DUALSTREAM_UNIFORM_PRECODING1) &&
      (dlsch0_harq->dl_power_off==1)) // we are in TM 6
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      K *= frame_parms->nb_antennas_tx_eNB;

      lte_ue_pdsch_vars[eNB_id]->log2_maxh = (log2_approx(K*avgs)/2);
    */

#ifdef DEBUG_PHY
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    LOG_D(PHY,"[DLSCH] log2_maxh = %d (%d,%d)\n",lte_ue_pdsch_vars[eNB_id]->log2_maxh,avg[0],avgs);
    LOG_D(PHY,"[DLSCH] mimo_mode = %d\n", dlsch0_harq->mimo_mode);
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#endif
  }
  aatx = frame_parms->nb_antennas_tx_eNB;
  aarx = frame_parms->nb_antennas_rx;

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  if (dlsch0_harq->mimo_mode<LARGE_CDD) {// SISO or ALAMOUTI
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    dlsch_channel_compensation(lte_ue_pdsch_vars[eNB_id]->rxdataF_ext,
			       lte_ue_pdsch_vars[eNB_id]->dl_ch_estimates_ext,
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			       lte_ue_pdsch_vars[eNB_id]->dl_ch_mag0,
			       lte_ue_pdsch_vars[eNB_id]->dl_ch_magb0,
			       lte_ue_pdsch_vars[eNB_id]->rxdataF_comp0,
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			       (aatx>1) ? lte_ue_pdsch_vars[eNB_id]->rho : NULL,
			       frame_parms,
			       symbol,
			       first_symbol_flag,
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			       get_Qm(dlsch0_harq->mcs),
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			       nb_rb,
			       lte_ue_pdsch_vars[eNB_id]->log2_maxh,
			       phy_measurements); // log2_maxh+I0_shift
#ifdef DEBUG_PHY
    if (symbol==5)
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      write_output("rxF_comp_d.m","rxF_c_d",&lte_ue_pdsch_vars[eNB_id]->rxdataF_comp0[0][symbol*frame_parms->N_RB_DL*12],frame_parms->N_RB_DL*12,1,1);
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#endif
      
    if ((dual_stream_flag==1) && 
	(eNB_id_i<phy_vars_ue->n_connected_eNB)) {
      // get MF output for interfering stream
      dlsch_channel_compensation(lte_ue_pdsch_vars[eNB_id_i]->rxdataF_ext,
				 lte_ue_pdsch_vars[eNB_id_i]->dl_ch_estimates_ext,
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				 lte_ue_pdsch_vars[eNB_id_i]->dl_ch_mag0,
				 lte_ue_pdsch_vars[eNB_id_i]->dl_ch_magb0,
				 lte_ue_pdsch_vars[eNB_id_i]->rxdataF_comp0,
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				 (aatx>1) ? lte_ue_pdsch_vars[eNB_id_i]->rho : NULL,
				 frame_parms,
				 symbol,
				 first_symbol_flag,
				 i_mod,
				 nb_rb,
				 lte_ue_pdsch_vars[eNB_id]->log2_maxh,
				 phy_measurements); // log2_maxh+I0_shift
#ifdef DEBUG_PHY
      if (symbol == 5) {
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	write_output("rxF_comp_d.m","rxF_c_d",&lte_ue_pdsch_vars[eNB_id]->rxdataF_comp0[0][symbol*frame_parms->N_RB_DL*12],frame_parms->N_RB_DL*12,1,1);
	write_output("rxF_comp_i.m","rxF_c_i",&lte_ue_pdsch_vars[eNB_id_i]->rxdataF_comp0[0][symbol*frame_parms->N_RB_DL*12],frame_parms->N_RB_DL*12,1,1);     
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      }
#endif 
	
      // compute correlation between signal and interference channels
      dlsch_dual_stream_correlation(frame_parms,
				    symbol,
				    nb_rb,
				    lte_ue_pdsch_vars[eNB_id]->dl_ch_estimates_ext,
				    lte_ue_pdsch_vars[eNB_id_i]->dl_ch_estimates_ext,
				    lte_ue_pdsch_vars[eNB_id]->dl_ch_rho_ext,
				    lte_ue_pdsch_vars[eNB_id]->log2_maxh);
    }
  }
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  else if (dlsch0_harq->mimo_mode == LARGE_CDD) {  // TM3
    //   LOG_I(PHY,"Running PDSCH RX for TM3\n");
    if (frame_parms->nb_antennas_tx_eNB == 2) {
      if (first_symbol_flag==1) {
	// effective channel of desired user is always stronger than interfering eff. channel
	dlsch_channel_level_TM3(lte_ue_pdsch_vars[eNB_id]->dl_ch_estimates_ext, 
				frame_parms, 
				avg, symbol, nb_rb);
	
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	//	LOG_D(PHY,"llr_offset = %d\n",offset_mumimo_llr_drange[dlsch0_harq->mcs][(dlsch1_harq->mcs>>1)-1]);
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	avg[0] = log2_approx(avg[0]) - 13 + offset_mumimo_llr_drange[dlsch0_harq->mcs][(get_Qm(dlsch1_harq->mcs)>>1)-1];

	lte_ue_pdsch_vars[eNB_id]->log2_maxh = cmax(avg[0],0);
	//	printf("log2_maxh =%d\n",lte_ue_pdsch_vars[eNB_id]->log2_maxh);
      }    
      dlsch_channel_compensation_TM3(frame_parms, 
				     lte_ue_pdsch_vars[eNB_id],
				     phy_measurements, 
				     eNB_id, 
				     symbol, 
				     get_Qm(dlsch0_harq->mcs), 
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				     get_Qm(dlsch1_harq->mcs),
				     dlsch0_harq->round,
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				     nb_rb, 
				     lte_ue_pdsch_vars[eNB_id]->log2_maxh); 
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      // compute correlation between signal and interference channels (rho12 and rho21)
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      dlsch_dual_stream_correlation(frame_parms,
				    symbol,
				    nb_rb,
				    lte_ue_pdsch_vars[eNB_id]->dl_ch_estimates_ext,
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				    &(lte_ue_pdsch_vars[eNB_id]->dl_ch_estimates_ext[2]),
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				    lte_ue_pdsch_vars[eNB_id]->dl_ch_rho_ext,
				    lte_ue_pdsch_vars[eNB_id]->log2_maxh);
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      dlsch_dual_stream_correlation(frame_parms,
				    symbol,
				    nb_rb,
				    &(lte_ue_pdsch_vars[eNB_id]->dl_ch_estimates_ext[2]),
				    lte_ue_pdsch_vars[eNB_id]->dl_ch_estimates_ext,
				    lte_ue_pdsch_vars[eNB_id]->dl_ch_rho2_ext,
				    lte_ue_pdsch_vars[eNB_id]->log2_maxh);
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      //printf("TM3 log2_maxh : %d\n",lte_ue_pdsch_vars[eNB_id]->log2_maxh);

    }
    else {
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      LOG_E(PHY, "only 2 tx antennas supported for TM3\n");
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    }
  }
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  else if (dlsch0_harq->mimo_mode<DUALSTREAM_UNIFORM_PRECODING1) {// single-layer precoding (TM5, TM6), potentially TM4 (Single-codeword)
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    //    printf("Channel compensation for precoding\n");
    //    if ((dual_stream_flag==1) && (eNB_id_i==NUMBER_OF_CONNECTED_eNB_MAX)) {
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    if ((dual_stream_flag==1) && (eNB_id_i==phy_vars_ue->n_connected_eNB)) {  // TM5 two-user
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      // Scale the channel estimates for interfering stream

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      dlsch_scale_channel(lte_ue_pdsch_vars[eNB_id_i]->dl_ch_estimates_ext,
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			  frame_parms,
			  dlsch_ue,
			  symbol,
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			  nb_rb);     
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      /* compute new log2_maxh for effective channel */
      if (first_symbol_flag==1) {
	// effective channel of desired user is always stronger than interfering eff. channel
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	dlsch_channel_level_TM56(lte_ue_pdsch_vars[eNB_id]->dl_ch_estimates_ext, frame_parms, lte_ue_pdsch_vars[eNB_id]->pmi_ext,	avg, symbol, nb_rb);
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	//    LOG_D(PHY,"llr_offset = %d\n",offset_mumimo_llr_drange[dlsch0_harq->mcs][(i_mod>>1)-1]);
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	avg[0] = log2_approx(avg[0]) - 13 + offset_mumimo_llr_drange[dlsch0_harq->mcs][(i_mod>>1)-1];
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	lte_ue_pdsch_vars[eNB_id]->log2_maxh = cmax(avg[0],0);
	//printf("log1_maxh =%d\n",lte_ue_pdsch_vars[eNB_id]->log2_maxh);
      }      

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      dlsch_channel_compensation_TM56(lte_ue_pdsch_vars[eNB_id]->rxdataF_ext, 
				      lte_ue_pdsch_vars[eNB_id]->dl_ch_estimates_ext, 
				      lte_ue_pdsch_vars[eNB_id]->dl_ch_mag0, 
				      lte_ue_pdsch_vars[eNB_id]->dl_ch_magb0, 
				      lte_ue_pdsch_vars[eNB_id]->rxdataF_comp0, 
				      lte_ue_pdsch_vars[eNB_id]->pmi_ext, 
				      frame_parms, 
				      phy_measurements, 
				      eNB_id, 
				      symbol, 
				      get_Qm(dlsch0_harq->mcs), 
				      nb_rb, 
				      lte_ue_pdsch_vars[eNB_id]->log2_maxh, 
				      dlsch0_harq->dl_power_off);
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      // if interference source is MU interference, assume opposite precoder was used at eNB

      // calculate opposite PMI
      for (rb=0;rb<nb_rb;rb++) {
	switch(lte_ue_pdsch_vars[eNB_id]->pmi_ext[rb]) {
	case 0:
	  lte_ue_pdsch_vars[eNB_id_i]->pmi_ext[rb]=1;
	  break;
	case 1:
	  lte_ue_pdsch_vars[eNB_id_i]->pmi_ext[rb]=0;
	  break;
	case 2:
	  lte_ue_pdsch_vars[eNB_id_i]->pmi_ext[rb]=3;
	  break;
	case 3:
	  lte_ue_pdsch_vars[eNB_id_i]->pmi_ext[rb]=2;
	  break;
	}
	//	if (rb==0)
	//	  printf("pmi %d, pmi_i %d\n",lte_ue_pdsch_vars[eNB_id]->pmi_ext[rb],lte_ue_pdsch_vars[eNB_id_i]->pmi_ext[rb]);
	
      }

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      dlsch_channel_compensation_TM56(lte_ue_pdsch_vars[eNB_id_i]->rxdataF_ext, 
				      lte_ue_pdsch_vars[eNB_id_i]->dl_ch_estimates_ext, 
				      lte_ue_pdsch_vars[eNB_id_i]->dl_ch_mag0, 
				      lte_ue_pdsch_vars[eNB_id_i]->dl_ch_magb0, 
				      lte_ue_pdsch_vars[eNB_id_i]->rxdataF_comp0, 
				      lte_ue_pdsch_vars[eNB_id_i]->pmi_ext, 
				      frame_parms, 
				      phy_measurements, 
				      eNB_id_i, 
				      symbol, 
				      i_mod, 
				      nb_rb, 
				      lte_ue_pdsch_vars[eNB_id]->log2_maxh, 
				      dlsch0_harq->dl_power_off);
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#ifdef DEBUG_PHY
      if (symbol==5) {
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	write_output("rxF_comp_d.m","rxF_c_d",&lte_ue_pdsch_vars[eNB_id]->rxdataF_comp0[0][symbol*frame_parms->N_RB_DL*12],frame_parms->N_RB_DL*12,1,1);
	write_output("rxF_comp_i.m","rxF_c_i",&lte_ue_pdsch_vars[eNB_id_i]->rxdataF_comp0[0][symbol*frame_parms->N_RB_DL*12],frame_parms->N_RB_DL*12,1,1);    
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      }
#endif  

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      dlsch_dual_stream_correlation(frame_parms, 
				    symbol, 
				    nb_rb, 
				    lte_ue_pdsch_vars[eNB_id]->dl_ch_estimates_ext, 
				    lte_ue_pdsch_vars[eNB_id_i]->dl_ch_estimates_ext, 
				    lte_ue_pdsch_vars[eNB_id]->dl_ch_rho_ext, 
				    lte_ue_pdsch_vars[eNB_id]->log2_maxh);
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    }
    else {
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      dlsch_channel_compensation_TM56(lte_ue_pdsch_vars[eNB_id]->rxdataF_ext,
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				      lte_ue_pdsch_vars[eNB_id]->dl_ch_estimates_ext,
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				      lte_ue_pdsch_vars[eNB_id]->dl_ch_mag0,
				      lte_ue_pdsch_vars[eNB_id]->dl_ch_magb0,
				      lte_ue_pdsch_vars[eNB_id]->rxdataF_comp0,
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				      lte_ue_pdsch_vars[eNB_id]->pmi_ext,
				      frame_parms,
				      phy_measurements,
				      eNB_id,
				      symbol,
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				      get_Qm(dlsch0_harq->mcs),
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				      nb_rb,
				      lte_ue_pdsch_vars[eNB_id]->log2_maxh,
				      1);
    }
  }

  //  printf("MRC\n");
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  if (frame_parms->nb_antennas_rx > 1) {
    if (dlsch0_harq->mimo_mode == LARGE_CDD) {
      if (frame_parms->nb_antennas_tx_eNB == 2) {
	dlsch_detection_mrc(frame_parms,
			    lte_ue_pdsch_vars[eNB_id]->rxdataF_comp0,
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			    lte_ue_pdsch_vars[eNB_id]->rxdataF_comp1[dlsch0_harq->round],
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			    lte_ue_pdsch_vars[eNB_id]->dl_ch_rho_ext,
			    lte_ue_pdsch_vars[eNB_id]->rho,
			    lte_ue_pdsch_vars[eNB_id]->dl_ch_mag0,
			    lte_ue_pdsch_vars[eNB_id]->dl_ch_magb0,
			    lte_ue_pdsch_vars[eNB_id]->dl_ch_mag1,
			    lte_ue_pdsch_vars[eNB_id]->dl_ch_magb1,
			    symbol,
			    nb_rb,
			    dual_stream_flag); 			    
      }
    }
    else {
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      dlsch_detection_mrc(frame_parms,
			  lte_ue_pdsch_vars[eNB_id]->rxdataF_comp0,
			  lte_ue_pdsch_vars[eNB_id_i]->rxdataF_comp0,
			  lte_ue_pdsch_vars[eNB_id]->rho,
			  lte_ue_pdsch_vars[eNB_id]->dl_ch_rho_ext,
			  lte_ue_pdsch_vars[eNB_id]->dl_ch_mag0,
			  lte_ue_pdsch_vars[eNB_id]->dl_ch_magb0,
			  lte_ue_pdsch_vars[eNB_id_i]->dl_ch_mag0,
			  lte_ue_pdsch_vars[eNB_id_i]->dl_ch_magb0,
			  symbol,
			  nb_rb,
			  dual_stream_flag); 
    }
  }
  //  printf("Combining");
  if ((dlsch0_harq->mimo_mode == SISO) ||
      ((dlsch0_harq->mimo_mode >= UNIFORM_PRECODING11) &&
       (dlsch0_harq->mimo_mode <= PUSCH_PRECODING0))) {

    /*
      dlsch_siso(frame_parms,
      lte_ue_pdsch_vars[eNB_id]->rxdataF_comp,
      lte_ue_pdsch_vars[eNB_id_i]->rxdataF_comp,
      symbol,
      nb_rb);
    */
  } else if (dlsch0_harq->mimo_mode == ALAMOUTI) {

    dlsch_alamouti(frame_parms,
		   lte_ue_pdsch_vars[eNB_id]->rxdataF_comp0,
		   lte_ue_pdsch_vars[eNB_id]->dl_ch_mag0,
		   lte_ue_pdsch_vars[eNB_id]->dl_ch_magb0,
		   symbol,
		   nb_rb);
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  } 
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  else if (dlsch0_harq->mimo_mode == LARGE_CDD) {
	
  }
  else {
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    LOG_W(PHY,"dlsch_rx: Unknown MIMO mode\n");
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    return (-1);
  }
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  //    printf("LLR");

  switch (get_Qm(dlsch0_harq->mcs)) {
  case 2 : 
    if (dlsch0_harq->mimo_mode != LARGE_CDD) { 
      if (dual_stream_flag == 0)
	dlsch_qpsk_llr(frame_parms,
		       lte_ue_pdsch_vars[eNB_id]->rxdataF_comp0,
		       lte_ue_pdsch_vars[eNB_id]->llr[0],
		       symbol,first_symbol_flag,nb_rb,
		       adjust_G2(frame_parms,dlsch0_harq->rb_alloc,2,subframe,symbol),
		       lte_ue_pdsch_vars[eNB_id]->llr128);
      else if (i_mod == 2) {
	dlsch_qpsk_qpsk_llr(frame_parms,
			    lte_ue_pdsch_vars[eNB_id]->rxdataF_comp0,
			    lte_ue_pdsch_vars[eNB_id_i]->rxdataF_comp0,
			    lte_ue_pdsch_vars[eNB_id]->dl_ch_rho_ext,
			    lte_ue_pdsch_vars[eNB_id]->llr[0],
			    symbol,first_symbol_flag,nb_rb,
			    adjust_G2(frame_parms,dlsch0_harq->rb_alloc,2,subframe,symbol),
			    lte_ue_pdsch_vars[eNB_id]->llr128);
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      }
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      else if (i_mod == 4) { 
	dlsch_qpsk_16qam_llr(frame_parms,
			     lte_ue_pdsch_vars[eNB_id]->rxdataF_comp0,
			     lte_ue_pdsch_vars[eNB_id_i]->rxdataF_comp0,
			     lte_ue_pdsch_vars[eNB_id_i]->dl_ch_mag0,
			     lte_ue_pdsch_vars[eNB_id]->dl_ch_rho_ext,
			     lte_ue_pdsch_vars[eNB_id]->llr[0],
			     symbol,first_symbol_flag,nb_rb,
			     adjust_G2(frame_parms,dlsch0_harq->rb_alloc,2,subframe,symbol),
			     lte_ue_pdsch_vars[eNB_id]->llr128);
      }
      else {
	dlsch_qpsk_64qam_llr(frame_parms,
			     lte_ue_pdsch_vars[eNB_id]->rxdataF_comp0,
			     lte_ue_pdsch_vars[eNB_id_i]->rxdataF_comp0,
			     lte_ue_pdsch_vars[eNB_id_i]->dl_ch_mag0,
			     lte_ue_pdsch_vars[eNB_id]->dl_ch_rho_ext,
			     lte_ue_pdsch_vars[eNB_id]->llr[0],
			     symbol,first_symbol_flag,nb_rb,
			     adjust_G2(frame_parms,dlsch0_harq->rb_alloc,2,subframe,symbol),
			     lte_ue_pdsch_vars[eNB_id]->llr128);
	    
      }          
    }
    else { // TM3
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      DevAssert(dlsch1_harq);
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      if (get_Qm(dlsch1_harq->mcs) == 2) {
	/*	dlsch_qpsk_llr(frame_parms,
		       lte_ue_pdsch_vars[eNB_id]->rxdataF_comp0,
		       lte_ue_pdsch_vars[eNB_id]->llr[0],
		       symbol,first_symbol_flag,nb_rb,
		       adjust_G2(frame_parms,dlsch0_harq->rb_alloc,2,subframe,symbol),
		       lte_ue_pdsch_vars[eNB_id]->llr128);
	*/
	dlsch_qpsk_qpsk_llr(frame_parms,
			    lte_ue_pdsch_vars[eNB_id]->rxdataF_comp0,
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			    lte_ue_pdsch_vars[eNB_id]->rxdataF_comp1[dlsch0_harq->round],
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			    lte_ue_pdsch_vars[eNB_id]->dl_ch_rho_ext,
			    lte_ue_pdsch_vars[eNB_id]->llr[0],
			    symbol,first_symbol_flag,nb_rb,
			    adjust_G2(frame_parms,dlsch0_harq->rb_alloc,2,subframe,symbol),
			    lte_ue_pdsch_vars[eNB_id]->llr128);
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	dlsch_qpsk_qpsk_llr(frame_parms,
			    lte_ue_pdsch_vars[eNB_id]->rxdataF_comp1[dlsch0_harq->round],
			    lte_ue_pdsch_vars[eNB_id]->rxdataF_comp0,
			    lte_ue_pdsch_vars[eNB_id]->dl_ch_rho2_ext,
			    lte_ue_pdsch_vars[eNB_id]->llr[1],
			    symbol,first_symbol_flag,nb_rb,
			    adjust_G2(frame_parms,dlsch1_harq->rb_alloc,2,subframe,symbol),
			    lte_ue_pdsch_vars[eNB_id]->llr128_2ndstream);
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      }
      else if (get_Qm(dlsch1_harq->mcs) == 4) { 
	dlsch_qpsk_16qam_llr(frame_parms,
			     lte_ue_pdsch_vars[eNB_id]->rxdataF_comp0,
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			     lte_ue_pdsch_vars[eNB_id]->rxdataF_comp1[dlsch0_harq->round],
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			     lte_ue_pdsch_vars[eNB_id]->dl_ch_mag1,
			     lte_ue_pdsch_vars[eNB_id]->dl_ch_rho_ext,
			     lte_ue_pdsch_vars[eNB_id]->llr[0],
			     symbol,first_symbol_flag,nb_rb,
			     adjust_G2(frame_parms,dlsch0_harq->rb_alloc,2,subframe,symbol),
			     lte_ue_pdsch_vars[eNB_id]->llr128);
      }
      else {
	dlsch_qpsk_64qam_llr(frame_parms,
			     lte_ue_pdsch_vars[eNB_id]->rxdataF_comp0,
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			     lte_ue_pdsch_vars[eNB_id]->rxdataF_comp1[dlsch0_harq->round],
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			     lte_ue_pdsch_vars[eNB_id]->dl_ch_mag1,
			     lte_ue_pdsch_vars[eNB_id]->dl_ch_rho_ext,
			     lte_ue_pdsch_vars[eNB_id]->llr[0],
			     symbol,first_symbol_flag,nb_rb,
			     adjust_G2(frame_parms,dlsch0_harq->rb_alloc,2,subframe,symbol),
			     lte_ue_pdsch_vars[eNB_id]->llr128);
	
      }          
    }
    break;
  case 4 :
    if (dual_stream_flag == 0) {
      dlsch_16qam_llr(frame_parms,
		      lte_ue_pdsch_vars[eNB_id]->rxdataF_comp0,
		      lte_ue_pdsch_vars[eNB_id]->llr[0],
		      lte_ue_pdsch_vars[eNB_id]->dl_ch_mag0,
		      symbol,first_symbol_flag,nb_rb,
		      adjust_G2(frame_parms,dlsch0_harq->rb_alloc,4,subframe,symbol),
		      lte_ue_pdsch_vars[eNB_id]->llr128);
    }
    else if (i_mod == 2) {
      dlsch_16qam_qpsk_llr(frame_parms,
			   lte_ue_pdsch_vars[eNB_id]->rxdataF_comp0,
			   lte_ue_pdsch_vars[eNB_id_i]->rxdataF_comp0,
			   lte_ue_pdsch_vars[eNB_id]->dl_ch_mag0,
			   lte_ue_pdsch_vars[eNB_id]->dl_ch_rho_ext,
			   lte_ue_pdsch_vars[eNB_id]->llr[0],
			   symbol,first_symbol_flag,nb_rb,
			   adjust_G2(frame_parms,dlsch0_harq->rb_alloc,2,subframe,symbol),
			   lte_ue_pdsch_vars[eNB_id]->llr128);
    } 
    else if (i_mod == 4) {
      dlsch_16qam_16qam_llr(frame_parms,
			    lte_ue_pdsch_vars[eNB_id]->rxdataF_comp0,
			    lte_ue_pdsch_vars[eNB_id_i]->rxdataF_comp0,
			    lte_ue_pdsch_vars[eNB_id]->dl_ch_mag0,
			    lte_ue_pdsch_vars[eNB_id_i]->dl_ch_mag0,
			    lte_ue_pdsch_vars[eNB_id]->dl_ch_rho_ext,
			    lte_ue_pdsch_vars[eNB_id]->llr[0],
			    symbol,first_symbol_flag,nb_rb,
			    adjust_G2(frame_parms,dlsch0_harq->rb_alloc,2,subframe,symbol),
			    lte_ue_pdsch_vars[eNB_id]->llr128);
    } else {
      dlsch_16qam_64qam_llr(frame_parms,
			    lte_ue_pdsch_vars[eNB_id]->rxdataF_comp0,
			    lte_ue_pdsch_vars[eNB_id_i]->rxdataF_comp0,
			    lte_ue_pdsch_vars[eNB_id]->dl_ch_mag0,
			    lte_ue_pdsch_vars[eNB_id_i]->dl_ch_mag0,
			    lte_ue_pdsch_vars[eNB_id]->dl_ch_rho_ext,
			    lte_ue_pdsch_vars[eNB_id]->llr[0],
			    symbol,first_symbol_flag,nb_rb,
			    adjust_G2(frame_parms,dlsch0_harq->rb_alloc,2,subframe,symbol),
			    lte_ue_pdsch_vars[eNB_id]->llr128);
    }
    break;
  case 6 :
    if (dual_stream_flag == 0) {
      dlsch_64qam_llr(frame_parms,
		      lte_ue_pdsch_vars[eNB_id]->rxdataF_comp0,
		      lte_ue_pdsch_vars[eNB_id]->llr[0],
		      lte_ue_pdsch_vars[eNB_id]->dl_ch_mag0,
		      lte_ue_pdsch_vars[eNB_id]->dl_ch_magb0,
		      symbol,first_symbol_flag,nb_rb,
		      adjust_G2(frame_parms,dlsch0_harq->rb_alloc,6,subframe,symbol),
		      lte_ue_pdsch_vars[eNB_id]->llr128);
    }
    else if (i_mod == 2) {              
      dlsch_64qam_qpsk_llr(frame_parms,
			   lte_ue_pdsch_vars[eNB_id]->rxdataF_comp0,
			   lte_ue_pdsch_vars[eNB_id_i]->rxdataF_comp0,
			   lte_ue_pdsch_vars[eNB_id]->dl_ch_mag0,
			   lte_ue_pdsch_vars[eNB_id]->dl_ch_rho_ext,
			   lte_ue_pdsch_vars[eNB_id]->llr[0],
			   symbol,first_symbol_flag,nb_rb,
			   adjust_G2(frame_parms,dlsch0_harq->rb_alloc,2,subframe,symbol),
			   lte_ue_pdsch_vars[eNB_id]->llr128);
    }
    else if (i_mod == 4) {
      dlsch_64qam_16qam_llr(frame_parms,
			    lte_ue_pdsch_vars[eNB_id]->rxdataF_comp0,
			    lte_ue_pdsch_vars[eNB_id_i]->rxdataF_comp0,
			    lte_ue_pdsch_vars[eNB_id]->dl_ch_mag0,
			    lte_ue_pdsch_vars[eNB_id_i]->dl_ch_mag0,
			    lte_ue_pdsch_vars[eNB_id]->dl_ch_rho_ext,
			    lte_ue_pdsch_vars[eNB_id]->llr[0],
			    symbol,first_symbol_flag,nb_rb,
			    adjust_G2(frame_parms,dlsch0_harq->rb_alloc,2,subframe,symbol),
			    lte_ue_pdsch_vars[eNB_id]->llr128);
	
    }
    else {	  
      dlsch_64qam_64qam_llr(frame_parms,
			    lte_ue_pdsch_vars[eNB_id]->rxdataF_comp0,
			    lte_ue_pdsch_vars[eNB_id_i]->rxdataF_comp0,
			    lte_ue_pdsch_vars[eNB_id]->dl_ch_mag0,
			    lte_ue_pdsch_vars[eNB_id_i]->dl_ch_mag0,
			    lte_ue_pdsch_vars[eNB_id]->dl_ch_rho_ext,
			    lte_ue_pdsch_vars[eNB_id]->llr[0],
			    symbol,first_symbol_flag,nb_rb,
			    adjust_G2(frame_parms,dlsch0_harq->rb_alloc,2,subframe,symbol),
			    lte_ue_pdsch_vars[eNB_id]->llr128);
    }
    break;
  default:
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    LOG_W(PHY,"rx_dlsch.c : Unknown mod_order!!!!\n");
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    return(-1);
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    break;
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  }
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  return(0);    
}

//==============================================================================================
// Pre-processing for LLR computation
//==============================================================================================

void dlsch_channel_compensation(int **rxdataF_ext,
                                int **dl_ch_estimates_ext,
                                int **dl_ch_mag,
                                int **dl_ch_magb,
                                int **rxdataF_comp,
                                int **rho,
                                LTE_DL_FRAME_PARMS *frame_parms,
                                unsigned char symbol,
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                                uint8_t first_symbol_flag,
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                                unsigned char mod_order,
                                unsigned short nb_rb,
                                unsigned char output_shift,
                                PHY_MEASUREMENTS *phy_measurements) {

  unsigned short rb;
  unsigned char aatx,aarx,symbol_mod,pilots=0;
  __m128i *dl_ch128,*dl_ch128_2,*dl_ch_mag128,*dl_ch_mag128b,*rxdataF128,*rxdataF_comp128,*rho128;
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  __m128i mmtmpD0,mmtmpD1,mmtmpD2,mmtmpD3,QAM_amp128,QAM_amp128b;
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  symbol_mod = (symbol>=(7-frame_parms->Ncp)) ? symbol-(7-frame_parms->Ncp) : symbol;

  if ((symbol_mod == 0) || (symbol_mod == (4-frame_parms->Ncp))) {
      
    if (frame_parms->mode1_flag==1) // 10 out of 12 so don't reduce size    
      nb_rb=1+(5*nb_rb/6);
    else  
      pilots=1;    
  }

  for (aatx=0;aatx<frame_parms->nb_antennas_tx_eNB;aatx++) {
    if (mod_order == 4) {
      QAM_amp128 = _mm_set1_epi16(QAM16_n1);  // 2/sqrt(10)
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      QAM_amp128b = _mm_setzero_si128();
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    }    
    else if (mod_order == 6) {
      QAM_amp128  = _mm_set1_epi16(QAM64_n1); // 
      QAM_amp128b = _mm_set1_epi16(QAM64_n2);
    }
    
    //    printf("comp: rxdataF_comp %p, symbol %d\n",rxdataF_comp[0],symbol);

    for (aarx=0;aarx<frame_parms->nb_antennas_rx;aarx++) {

      dl_ch128          = (__m128i *)&dl_ch_estimates_ext[(aatx<<1)+aarx][symbol*frame_parms->N_RB_DL*12];
      dl_ch_mag128      = (__m128i *)&dl_ch_mag[(aatx<<1)+aarx][symbol*frame_parms->N_RB_DL*12];
      dl_ch_mag128b     = (__m128i *)&dl_ch_magb[(aatx<<1)+aarx][symbol*frame_parms->N_RB_DL*12];
      rxdataF128        = (__m128i *)&rxdataF_ext[aarx][symbol*frame_parms->N_RB_DL*12];
      rxdataF_comp128   = (__m128i *)&rxdataF_comp[(aatx<<1)+aarx][symbol*frame_parms->N_RB_DL*12];


      for (rb=0;rb<nb_rb;rb++) {
	if (mod_order>2) {  
	  // get channel amplitude if not QPSK
                
	  mmtmpD0 = _mm_madd_epi16(dl_ch128[0],dl_ch128[0]);
	  mmtmpD0 = _mm_srai_epi32(mmtmpD0,output_shift);
                
	  mmtmpD1 = _mm_madd_epi16(dl_ch128[1],dl_ch128[1]);
	  mmtmpD1 = _mm_srai_epi32(mmtmpD1,output_shift);
                
	  mmtmpD0 = _mm_packs_epi32(mmtmpD0,mmtmpD1);
                
	  // store channel magnitude here in a new field of dlsch
                
	  dl_ch_mag128[0] = _mm_unpacklo_epi16(mmtmpD0,mmtmpD0);
	  dl_ch_mag128b[0] = dl_ch_mag128[0];
	  dl_ch_mag128[0] = _mm_mulhi_epi16(dl_ch_mag128[0],QAM_amp128);
	  dl_ch_mag128[0] = _mm_slli_epi16(dl_ch_mag128[0],1);
                
	  dl_ch_mag128[1] = _mm_unpackhi_epi16(mmtmpD0,mmtmpD0);
	  dl_ch_mag128b[1] = dl_ch_mag128[1];
	  dl_ch_mag128[1] = _mm_mulhi_epi16(dl_ch_mag128[1],QAM_amp128);
	  dl_ch_mag128[1] = _mm_slli_epi16(dl_ch_mag128[1],1);
                
	  if (pilots==0) {
	    mmtmpD0 = _mm_madd_epi16(dl_ch128[2],dl_ch128[2]);
	    mmtmpD0 = _mm_srai_epi32(mmtmpD0,output_shift);
	    mmtmpD1 = _mm_packs_epi32(mmtmpD0,mmtmpD0);
                    
	    dl_ch_mag128[2] = _mm_unpacklo_epi16(mmtmpD1,mmtmpD1);
	    dl_ch_mag128b[2] = dl_ch_mag128[2];
                    
	    dl_ch_mag128[2] = _mm_mulhi_epi16(dl_ch_mag128[2],QAM_amp128);
	    dl_ch_mag128[2] = _mm_slli_epi16(dl_ch_mag128[2],1);	  
	  }
                
	  dl_ch_mag128b[0] = _mm_mulhi_epi16(dl_ch_mag128b[0],QAM_amp128b);
	  dl_ch_mag128b[0] = _mm_slli_epi16(dl_ch_mag128b[0],1);
                
                
	  dl_ch_mag128b[1] = _mm_mulhi_epi16(dl_ch_mag128b[1],QAM_amp128b);
	  dl_ch_mag128b[1] = _mm_slli_epi16(dl_ch_mag128b[1],1);
                
	  if (pilots==0) {
	    dl_ch_mag128b[2] = _mm_mulhi_epi16(dl_ch_mag128b[2],QAM_amp128b);
	    dl_ch_mag128b[2] = _mm_slli_epi16(dl_ch_mag128b[2],1);	  
	  }
	}
	
	// multiply by conjugated channel
	mmtmpD0 = _mm_madd_epi16(dl_ch128[0],rxdataF128[0]);
	//	print_ints("re",&mmtmpD0);
            
	// mmtmpD0 contains real part of 4 consecutive outputs (32-bit)
	mmtmpD1 = _mm_shufflelo_epi16(dl_ch128[0],_MM_SHUFFLE(2,3,0,1));
	mmtmpD1 = _mm_shufflehi_epi16(mmtmpD1,_MM_SHUFFLE(2,3,0,1));
	mmtmpD1 = _mm_sign_epi16(mmtmpD1,*(__m128i*)&conjugate[0]);
	//	print_ints("im",&mmtmpD1);
	mmtmpD1 = _mm_madd_epi16(mmtmpD1,rxdataF128[0]);
	// mmtmpD1 contains imag part of 4 consecutive outputs (32-bit)
	mmtmpD0 = _mm_srai_epi32(mmtmpD0,output_shift);
	//	print_ints("re(shift)",&mmtmpD0);
	mmtmpD1 = _mm_srai_epi32(mmtmpD1,output_shift);
	//	print_ints("im(shift)",&mmtmpD1);
	mmtmpD2 = _mm_unpacklo_epi32(mmtmpD0,mmtmpD1);
	mmtmpD3 = _mm_unpackhi_epi32(mmtmpD0,mmtmpD1);
	//       	print_ints("c0",&mmtmpD2);
	//	print_ints("c1",&mmtmpD3);
	rxdataF_comp128[0] = _mm_packs_epi32(mmtmpD2,mmtmpD3);
	//	print_shorts("rx:",rxdataF128);
	//	print_shorts("ch:",dl_ch128);
	//	print_shorts("pack:",rxdataF_comp128);
            
	// multiply by conjugated channel
	mmtmpD0 = _mm_madd_epi16(dl_ch128[1],rxdataF128[1]);
	// mmtmpD0 contains real part of 4 consecutive outputs (32-bit)
	mmtmpD1 = _mm_shufflelo_epi16(dl_ch128[1],_MM_SHUFFLE(2,3,0,1));
	mmtmpD1 = _mm_shufflehi_epi16(mmtmpD1,_MM_SHUFFLE(2,3,0,1));
	mmtmpD1 = _mm_sign_epi16(mmtmpD1,*(__m128i*)conjugate);
	mmtmpD1 = _mm_madd_epi16(mmtmpD1,rxdataF128[1]);
	// mmtmpD1 contains imag part of 4 consecutive outputs (32-bit)
	mmtmpD0 = _mm_srai_epi32(mmtmpD0,output_shift);
	mmtmpD1 = _mm_srai_epi32(mmtmpD1,output_shift);
	mmtmpD2 = _mm_unpacklo_epi32(mmtmpD0,mmtmpD1);
	mmtmpD3 = _mm_unpackhi_epi32(mmtmpD0,mmtmpD1);
            
	rxdataF_comp128[1] = _mm_packs_epi32(mmtmpD2,mmtmpD3);
	//	print_shorts("rx:",rxdataF128+1);
	//	print_shorts("ch:",dl_ch128+1);
	//	print_shorts("pack:",rxdataF_comp128+1);	
            
	if (pilots==0) {
	  // multiply by conjugated channel
	  mmtmpD0 = _mm_madd_epi16(dl_ch128[2],rxdataF128[2]);
	  // mmtmpD0 contains real part of 4 consecutive outputs (32-bit)
	  mmtmpD1 = _mm_shufflelo_epi16(dl_ch128[2],_MM_SHUFFLE(2,3,0,1));
	  mmtmpD1 = _mm_shufflehi_epi16(mmtmpD1,_MM_SHUFFLE(2,3,0,1));
	  mmtmpD1 = _mm_sign_epi16(mmtmpD1,*(__m128i*)conjugate);
	  mmtmpD1 = _mm_madd_epi16(mmtmpD1,rxdataF128[2]);
	  // mmtmpD1 contains imag part of 4 consecutive outputs (32-bit)
	  mmtmpD0 = _mm_srai_epi32(mmtmpD0,output_shift);
	  mmtmpD1 = _mm_srai_epi32(mmtmpD1,output_shift);
	  mmtmpD2 = _mm_unpacklo_epi32(mmtmpD0,mmtmpD1);
	  mmtmpD3 = _mm_unpackhi_epi32(mmtmpD0,mmtmpD1);
                
	  rxdataF_comp128[2] = _mm_packs_epi32(mmtmpD2,mmtmpD3);
	  //	print_shorts("rx:",rxdataF128+2);
	  //	print_shorts("ch:",dl_ch128+2);
	  //      	print_shorts("pack:",rxdataF_comp128+2);
                
	  dl_ch128+=3;
	  dl_ch_mag128+=3;
	  dl_ch_mag128b+=3;
	  rxdataF128+=3;
	  rxdataF_comp128+=3;
	}
	else { // we have a smaller PDSCH in symbols with pilots so skip last group of 4 REs and increment less
	  dl_ch128+=2;
	  dl_ch_mag128+=2;
	  dl_ch_mag128b+=2;
	  rxdataF128+=2;
	  rxdataF_comp128+=2;
	}
            
      }
    }
  }
  
  if (rho) {
      
      
    for (aarx=0;aarx<frame_parms->nb_antennas_rx;aarx++) {
      rho128        = (__m128i *)&rho[aarx][symbol*frame_parms->N_RB_DL*12];
      dl_ch128      = (__m128i *)&dl_ch_estimates_ext[aarx][symbol*frame_parms->N_RB_DL*12];
      dl_ch128_2    = (__m128i *)&dl_ch_estimates_ext[2+aarx][symbol*frame_parms->N_RB_DL*12];
          
      for (rb=0;rb<nb_rb;rb++) {
	// multiply by conjugated channel
	mmtmpD0 = _mm_madd_epi16(dl_ch128[0],dl_ch128_2[0]);
	//	print_ints("re",&mmtmpD0);
              
	// mmtmpD0 contains real part of 4 consecutive outputs (32-bit)
	mmtmpD1 = _mm_shufflelo_epi16(dl_ch128[0],_MM_SHUFFLE(2,3,0,1));
	mmtmpD1 = _mm_shufflehi_epi16(mmtmpD1,_MM_SHUFFLE(2,3,0,1));
	mmtmpD1 = _mm_sign_epi16(mmtmpD1,*(__m128i*)&conjugate[0]);
	//	print_ints("im",&mmtmpD1);
	mmtmpD1 = _mm_madd_epi16(mmtmpD1,dl_ch128_2[0]);
	// mmtmpD1 contains imag part of 4 consecutive outputs (32-bit)
	mmtmpD0 = _mm_srai_epi32(mmtmpD0,output_shift);
	//	print_ints("re(shift)",&mmtmpD0);
	mmtmpD1 = _mm_srai_epi32(mmtmpD1,output_shift);
	//	print_ints("im(shift)",&mmtmpD1);
	mmtmpD2 = _mm_unpacklo_epi32(mmtmpD0,mmtmpD1);
	mmtmpD3 = _mm_unpackhi_epi32(mmtmpD0,mmtmpD1);
	//       	print_ints("c0",&mmtmpD2);
	//	print_ints("c1",&mmtmpD3);
	rho128[0] = _mm_packs_epi32(mmtmpD2,mmtmpD3);
              
	//print_shorts("rx:",dl_ch128_2);
	//print_shorts("ch:",dl_ch128);
	//print_shorts("pack:",rho128);
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