dlsch_demodulation.c 196 KB
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/******************************************************************************
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    OpenAirInterface
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    Copyright(c) 1999 - 2014 Eurecom
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    OpenAirInterface is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.
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    OpenAirInterface is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.
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    You should have received a copy of the GNU General Public License
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    along with OpenAirInterface.The full GNU General Public License is
   included in this distribution in the file called "COPYING". If not,
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   see <http://www.gnu.org/licenses/>.
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  Contact Information
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  OpenAirInterface Admin: openair_admin@eurecom.fr
  OpenAirInterface Tech : openair_tech@eurecom.fr
  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
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#define NOCYGWIN_STATIC
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#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
*/
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,
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             unsigned char harq_pid)
{

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  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;

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  unsigned char aatx,aarx;
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  unsigned short nb_rb;
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  int avgs, rb;
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  LTE_DL_UE_HARQ_t *dlsch0_harq,*dlsch1_harq = 0;
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  uint8_t beamforming_mode = phy_vars_ue->transmission_mode[eNB_id]<7?0:phy_vars_ue->transmission_mode[eNB_id];
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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;
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  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;
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  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);
  }
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  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);
  }
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  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;
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    else
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    pilots=0;
  */

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  if (frame_parms->nb_antennas_tx_eNB>1 && beamforming_mode==0) {
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#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,
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                                   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,
                                   dlsch0_harq->pmi_alloc,
                                   lte_ue_pdsch_vars[eNB_id]->pmi_ext,
                                   dlsch0_harq->rb_alloc,
                                   symbol,
                                   subframe,
                                   phy_vars_ue->high_speed_flag,
                                   frame_parms);
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    if (dual_stream_flag==1) {
      if (eNB_id_i<phy_vars_ue->n_connected_eNB)
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        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,
                                       dlsch0_harq->pmi_alloc,
                                       lte_ue_pdsch_vars[eNB_id_i]->pmi_ext,
                                       dlsch0_harq->rb_alloc,
                                       symbol,
                                       subframe,
                                       phy_vars_ue->high_speed_flag,
                                       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,
                                       dlsch0_harq->pmi_alloc,
                                       lte_ue_pdsch_vars[eNB_id_i]->pmi_ext,
                                       dlsch0_harq->rb_alloc,
                                       symbol,
                                       subframe,
                                       phy_vars_ue->high_speed_flag,
                                       frame_parms);
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    }
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  } else if (beamforming_mode==0) {// if n_tx>1
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    nb_rb = dlsch_extract_rbs_single(lte_ue_common_vars->rxdataF,
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                                     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,
                                     dlsch0_harq->pmi_alloc,
                                     lte_ue_pdsch_vars[eNB_id]->pmi_ext,
                                     dlsch0_harq->rb_alloc,
                                     symbol,
                                     subframe,
                                     phy_vars_ue->high_speed_flag,
                                     frame_parms);

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    if (dual_stream_flag==1) {
      if (eNB_id_i<phy_vars_ue->n_connected_eNB)
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        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,
                                         dlsch0_harq->pmi_alloc,
                                         lte_ue_pdsch_vars[eNB_id_i]->pmi_ext,
                                         dlsch0_harq->rb_alloc,
                                         symbol,
                                         subframe,
                                         phy_vars_ue->high_speed_flag,
                                         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,
                                         dlsch0_harq->pmi_alloc,
                                         lte_ue_pdsch_vars[eNB_id_i]->pmi_ext,
                                         dlsch0_harq->rb_alloc,
                                         symbol,
                                         subframe,
                                         phy_vars_ue->high_speed_flag,
                                         frame_parms);
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    }
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  } else if (beamforming_mode==7) { //else n_tx>1
    nb_rb = dlsch_extract_rbs_TM7(lte_ue_common_vars->rxdataF,
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                                  lte_ue_pdsch_vars[eNB_id]->dl_bf_ch_estimates,
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                                  lte_ue_pdsch_vars[eNB_id]->rxdataF_ext,
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                                  lte_ue_pdsch_vars[eNB_id]->dl_bf_ch_estimates_ext,
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				  dlsch0_harq->rb_alloc,
                                  symbol,
                                  subframe,
                                  phy_vars_ue->high_speed_flag,
                                  frame_parms);
    
  } else if(beamforming_mode>7) {
    LOG_W(PHY,"dlsch_demodulation:beamforming mode not supported yet.\n");
  }
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  //  printf("nb_rb = %d, eNB_id %d\n",nb_rb,eNB_id);
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  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) {
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    if (beamforming_mode==0)
       dlsch_channel_level(lte_ue_pdsch_vars[eNB_id]->dl_ch_estimates_ext,
                           frame_parms,
                           avg,
                           symbol,
                           nb_rb);
    else
       dlsch_channel_level(lte_ue_pdsch_vars[eNB_id]->dl_bf_ch_estimates_ext,
                           frame_parms,
                           avg,
                           symbol,
                           nb_rb);
       
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#ifdef DEBUG_PHY
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    LOG_D(PHY,"[DLSCH] avg[0] %d\n",avg[0]);
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#endif
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    // 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;
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    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) &&
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        (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
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    /* K = Nb_rx         in TM1
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       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
  }
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  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,
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                               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,
                               (aatx>1) ? lte_ue_pdsch_vars[eNB_id]->rho : NULL,
                               frame_parms,
                               symbol,
                               first_symbol_flag,
                               get_Qm(dlsch0_harq->mcs),
                               nb_rb,
                               lte_ue_pdsch_vars[eNB_id]->log2_maxh,
                               phy_measurements); // log2_maxh+I0_shift
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#ifdef DEBUG_PHY
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    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
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    if ((dual_stream_flag==1) &&
        (eNB_id_i<phy_vars_ue->n_connected_eNB)) {
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      // get MF output for interfering stream
      dlsch_channel_compensation(lte_ue_pdsch_vars[eNB_id_i]->rxdataF_ext,
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                                 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,
                                 (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
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#ifdef DEBUG_PHY
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      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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      }
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#endif

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      // compute correlation between signal and interference channels
      dlsch_dual_stream_correlation(frame_parms,
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                                    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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    }
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  } else if (dlsch0_harq->mimo_mode == LARGE_CDD) { // TM3
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    //   LOG_I(PHY,"Running PDSCH RX for TM3\n");
    if (frame_parms->nb_antennas_tx_eNB == 2) {
      if (first_symbol_flag==1) {
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        // 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);

        //  LOG_D(PHY,"llr_offset = %d\n",offset_mumimo_llr_drange[dlsch0_harq->mcs][(dlsch1_harq->mcs>>1)-1]);
        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),
                                     get_Qm(dlsch1_harq->mcs),
                                     dlsch0_harq->round,
                                     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,
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                                    symbol,
                                    nb_rb,
                                    lte_ue_pdsch_vars[eNB_id]->dl_ch_estimates_ext,
                                    &(lte_ue_pdsch_vars[eNB_id]->dl_ch_estimates_ext[2]),
                                    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,
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                                    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);

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    } 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");
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    //    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,
                          nb_rb);
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      /* compute new log2_maxh for effective channel */
      if (first_symbol_flag==1) {
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        // effective channel of desired user is always stronger than interfering eff. channel
        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);

        //    LOG_D(PHY,"llr_offset = %d\n",offset_mumimo_llr_drange[dlsch0_harq->mcs][(i_mod>>1)-1]);
        avg[0] = log2_approx(avg[0]) - 13 + offset_mumimo_llr_drange[dlsch0_harq->mcs][(i_mod>>1)-1];

        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);
      }

      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
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      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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      }

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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
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      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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      }

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#endif

      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,
                                      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,
                                      1);
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    }
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  } else if (dlsch0_harq->mimo_mode==TM7) { //TM7

    dlsch_channel_compensation(lte_ue_pdsch_vars[eNB_id]->rxdataF_ext,
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                               lte_ue_pdsch_vars[eNB_id]->dl_bf_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,
                               (aatx>1) ? lte_ue_pdsch_vars[eNB_id]->rho : NULL,
                               frame_parms,
                               symbol,
                               first_symbol_flag,
                               get_Qm(dlsch0_harq->mcs),
                               nb_rb,
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                               //9,
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                               lte_ue_pdsch_vars[eNB_id]->log2_maxh,
                               phy_measurements); // log2_maxh+I0_shift
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  }

  //  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) {
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        dlsch_detection_mrc(frame_parms,
                            lte_ue_pdsch_vars[eNB_id]->rxdataF_comp0,
                            lte_ue_pdsch_vars[eNB_id]->rxdataF_comp1[dlsch0_harq->round],
                            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);
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      }
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    } else {

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      dlsch_detection_mrc(frame_parms,
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                          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);
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    }
  }
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  //  printf("Combining");
  if ((dlsch0_harq->mimo_mode == SISO) ||
      ((dlsch0_harq->mimo_mode >= UNIFORM_PRECODING11) &&
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       (dlsch0_harq->mimo_mode <= PUSCH_PRECODING0)) ||
       (dlsch0_harq->mimo_mode == TM7)) {
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    /*
      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,
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                   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)) {
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  case 2 :
    if (dlsch0_harq->mimo_mode != LARGE_CDD) {
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      if (dual_stream_flag == 0)
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        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),
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                       lte_ue_pdsch_vars[eNB_id]->llr128,
                       beamforming_mode);
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      else if (i_mod == 2) {
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        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);
      } 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);

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      }
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    } else { // TM3
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      DevAssert(dlsch1_harq);
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      if (get_Qm(dlsch1_harq->mcs) == 2) {
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        /*  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,
                            lte_ue_pdsch_vars[eNB_id]->rxdataF_comp1[dlsch0_harq->round],
                            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);
        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);
      } else if (get_Qm(dlsch1_harq->mcs) == 4) {
        dlsch_qpsk_16qam_llr(frame_parms,
                             lte_ue_pdsch_vars[eNB_id]->rxdataF_comp0,
                             lte_ue_pdsch_vars[eNB_id]->rxdataF_comp1[dlsch0_harq->round],
                             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,
                             lte_ue_pdsch_vars[eNB_id]->rxdataF_comp1[dlsch0_harq->round],
                             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);

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      }
    }
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    break;
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  case 4 :
    if (dual_stream_flag == 0) {
      dlsch_16qam_llr(frame_parms,
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                      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) {
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      dlsch_16qam_qpsk_llr(frame_parms,
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                           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) {
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      dlsch_16qam_16qam_llr(frame_parms,
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                            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);
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    } else {
      dlsch_16qam_64qam_llr(frame_parms,
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                            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);
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    }
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    break;
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  case 6 :
    if (dual_stream_flag == 0) {
      dlsch_64qam_llr(frame_parms,
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                      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) {
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      dlsch_64qam_qpsk_llr(frame_parms,
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                           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) {
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      dlsch_64qam_16qam_llr(frame_parms,
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                            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 {
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      dlsch_64qam_64qam_llr(frame_parms,
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                            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);
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    }
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    break;
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  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);
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}

//==============================================================================================
// 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,
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                                PHY_MEASUREMENTS *phy_measurements)
{
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#if defined(__i386) || defined(__x86_64)
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  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))) {
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    if (frame_parms->mode1_flag==1) // 10 out of 12 so don't reduce size
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      nb_rb=1+(5*nb_rb/6);
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    else
      pilots=1;
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  }

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  for (aatx=0; aatx<frame_parms->nb_antennas_tx_eNB; aatx++) {
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    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); //
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      QAM_amp128b = _mm_set1_epi16(QAM64_n2);
    }
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    //    printf("comp: rxdataF_comp %p, symbol %d\n",rxdataF_comp[0],symbol);

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


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      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);

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