srs_modulation.c 12.2 KB
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/*******************************************************************************
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    OpenAirInterface
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    Copyright(c) 1999 - 2014 Eurecom
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    OpenAirInterface is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.
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    OpenAirInterface is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.
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    You should have received a copy of the GNU General Public License
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    along with OpenAirInterface.The full GNU General Public License is
   included in this distribution in the file called "COPYING". If not,
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   see <http://www.gnu.org/licenses/>.
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  Contact Information
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  OpenAirInterface Admin: openair_admin@eurecom.fr
  OpenAirInterface Tech : openair_tech@eurecom.fr
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  OpenAirInterface Dev  : openair4g-devel@lists.eurecom.fr
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  Address      : Eurecom, Campus SophiaTech, 450 Route des Chappes, CS 50193 - 06904 Biot Sophia Antipolis cedex, FRANCE
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 *******************************************************************************/
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/*! \file PHY/LTE_TRANSPORT/srs_modulation.c
* \brief Top-level routines for generating sounding reference signal (SRS) V8.6 2009-03
* \author R. Knopp, F. Kaltenberger
* \date 2011
* \version 0.1
* \company Eurecom
* \email: knopp@eurecom.fr, florian.kaltenberger@eurecom.fr
* \note
* \warning
*/
#include "PHY/defs.h"
#include "extern.h"
#include "UTIL/LOG/log.h"

unsigned short msrsb_6_40[8][4] = {{36,12,4,4},
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  {32,16,8,4},
  {24,4,4,4},
  {20,4,4,4},
  {16,4,4,4},
  {12,4,4,4},
  {8,4,4,4},
  {4,4,4,4}
};
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unsigned short msrsb_41_60[8][4] = {{48,24,12,4},
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  {48,16,8,4},
  {40,20,4,4},
  {36,12,4,4},
  {32,16,8,4},
  {24,4,4,4},
  {20,4,4,4},
  {16,4,4,4}
};
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unsigned short msrsb_61_80[8][4] = {{72,24,12,4},
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  {64,32,16,4},
  {60,20,4,4},
  {48,24,12,4},
  {48,16,8,4},
  {40,20,4,4},
  {36,12,4,4},
  {32,16,8,4}
};
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unsigned short msrsb_81_110[8][4] = {{96,48,24,4},
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  {96,32,16,4},
  {80,40,20,4},
  {72,24,12,4},
  {64,32,16,4},
  {60,20,4,4},
  {48,24,12,4},
  {48,16,8,4}
};
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unsigned short Nb_6_40[8][4] = {{36,12,4,4},
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  {32,16,8,4},
  {24,4,4,4},
  {20,4,4,4},
  {16,4,4,4},
  {12,4,4,4},
  {8,4,4,4},
  {4,4,4,4}
};
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unsigned short Nb_41_60[8][4] = {{48,24,12,4},
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  {48,16,8,4},
  {40,20,4,4},
  {36,12,4,4},
  {32,16,8,4},
  {24,4,4,4},
  {20,4,4,4},
  {16,4,4,4}
};
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unsigned short Nb_61_80[8][4] = {{72,24,12,4},
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  {64,32,16,4},
  {60,20,4,4},
  {48,24,12,4},
  {48,16,8,4},
  {40,20,4,4},
  {36,12,4,4},
  {32,16,8,4}
};
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unsigned short Nb_81_110[8][4] = {{96,48,24,4},
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  {96,32,16,4},
  {80,40,20,4},
  {72,24,12,4},
  {64,32,16,4},
  {60,20,4,4},
  {48,24,12,4},
  {48,16,8,4}
};
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unsigned short transmission_offset_tdd[16] = {2,6,10,18,14,22,26,30,70,74,194,326,586,210};

int compareints (const void * a, const void * b)
{
  return ( *(unsigned short*)a - *(unsigned short*)b );
}


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int32_t generate_srs_tx(PHY_VARS_UE *phy_vars_ue,
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                        uint8_t eNB_id,
                        int16_t amp,
                        uint32_t subframe)
{
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  LTE_DL_FRAME_PARMS *frame_parms=&phy_vars_ue->lte_frame_parms;
  SOUNDINGRS_UL_CONFIG_DEDICATED *soundingrs_ul_config_dedicated=&phy_vars_ue->soundingrs_ul_config_dedicated[eNB_id];
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  int32_t *txdataF = phy_vars_ue->lte_ue_common_vars.txdataF[0];
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  uint16_t msrsb=0,Nb=0,nb,b,msrs0=0,k,Msc_RS,Msc_RS_idx,carrier_pos,symbol_offset;
  uint16_t *Msc_idx_ptr;
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  int32_t k0;
  uint32_t T_SFC;
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  uint32_t subframe_offset;
  uint8_t Bsrs  = soundingrs_ul_config_dedicated->srs_Bandwidth;
  uint8_t Csrs  = frame_parms->soundingrs_ul_config_common.srs_BandwidthConfig;
  uint8_t Ssrs  = frame_parms->soundingrs_ul_config_common.srs_SubframeConfig;
  uint8_t n_RRC = soundingrs_ul_config_dedicated->freqDomainPosition;
  uint8_t kTC   = soundingrs_ul_config_dedicated->transmissionComb;
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  if (frame_parms->N_RB_UL < 41) {
    msrs0 = msrsb_6_40[Csrs][0];
    msrsb = msrsb_6_40[Csrs][Bsrs];
    Nb    = Nb_6_40[Csrs][Bsrs];
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  } else if (frame_parms->N_RB_UL < 61) {
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    msrs0 = msrsb_41_60[Csrs][0];
    msrsb = msrsb_41_60[Csrs][Bsrs];
    Nb    = Nb_41_60[Csrs][Bsrs];
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  } else if (frame_parms->N_RB_UL < 81) {
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    msrs0 = msrsb_61_80[Csrs][0];
    msrsb = msrsb_61_80[Csrs][Bsrs];
    Nb    = Nb_61_80[Csrs][Bsrs];
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  } else if (frame_parms->N_RB_UL <111) {
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    msrs0 = msrsb_81_110[Csrs][0];
    msrsb = msrsb_81_110[Csrs][Bsrs];
    Nb    = Nb_81_110[Csrs][Bsrs];
  }

  Msc_RS = msrsb * 6;
  k0 = (((frame_parms->N_RB_UL>>1)-(msrs0>>1))*12) + kTC;
  nb  = (4*n_RRC/msrsb)%Nb;

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  for (b=0; b<=Bsrs; b++) {
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    k0 += 2*nb*Msc_RS;
  }

  if (k0<0) {
    msg("generate_srs: invalid parameter set msrs0=%d, msrsb=%d, Nb=%d => nb=%d, k0=%d\n",msrs0,msrsb,Nb,nb,k0);
    return(-1);
  }

#ifdef USER_MODE
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  Msc_idx_ptr = (uint16_t*) bsearch((uint16_t*) &Msc_RS, (uint16_t*) dftsizes, 33, sizeof(uint16_t), compareints);
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  if (Msc_idx_ptr)
    Msc_RS_idx = Msc_idx_ptr - dftsizes;
  else {
    msg("generate_srs: index for Msc_RS=%d not found\n",Msc_RS);
    return(-1);
  }
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#else //stdlib not availiable in RTAI
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  if (Msc_RS==216)
    Msc_RS_idx = 12;
  else if (Msc_RS==144)
    Msc_RS_idx = 9;
  else {
    msg("generate_srs: index for Msc_RS=%d not implemented\n",Msc_RS);
    return(-1);
  }
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#endif

#ifdef DEBUG_SRS
  msg("generate_srs_tx: Msc_RS = %d, Msc_RS_idx = %d\n",Msc_RS, Msc_RS_idx);
#endif

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  T_SFC = (Ssrs<=7 ? 5 : 10);

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  if ((1<<(subframe%T_SFC))&transmission_offset_tdd[Ssrs]) {

#ifndef IFFT_FPGA_UE
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    carrier_pos = (frame_parms->first_carrier_offset + k0) % frame_parms->ofdm_symbol_size;
    //msg("carrier_pos = %d\n",carrier_pos);
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    subframe_offset = subframe*frame_parms->symbols_per_tti*frame_parms->ofdm_symbol_size;
    symbol_offset = subframe_offset+(frame_parms->symbols_per_tti-1)*frame_parms->ofdm_symbol_size;
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    for (k=0; k<Msc_RS; k++) {
      ((short*) txdataF)[2*(symbol_offset + carrier_pos)]   = (short) (((int32_t) amp * (int32_t) ul_ref_sigs[0][0][Msc_RS_idx][k<<1])>>15);
      ((short*) txdataF)[2*(symbol_offset + carrier_pos)+1] = (short) (((int32_t) amp * (int32_t) ul_ref_sigs[0][0][Msc_RS_idx][(k<<1)+1])>>15);
      carrier_pos+=2;
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      if (carrier_pos >= frame_parms->ofdm_symbol_size)
        carrier_pos=1;
    }

#else
    carrier_pos = (frame_parms->N_RB_UL*12/2 + k0) % (frame_parms->N_RB_UL*12);
    //msg("carrier_pos = %d\n",carrier_pos);

    subframe_offset = subframe*frame_parms->symbols_per_tti*frame_parms->N_RB_UL*12;
    symbol_offset = subframe_offset+(frame_parms->symbols_per_tti-1)*frame_parms->N_RB_UL*12;

    for (k=0; k<Msc_RS; k++) {
      if ((ul_ref_sigs[0][0][Msc_RS_idx][k<<1] >= 0) && (ul_ref_sigs[0][0][Msc_RS_idx][(k<<1)+1] >= 0))
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        txdataF[symbol_offset+carrier_pos] = (int32_t) 4;
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      else if ((ul_ref_sigs[0][0][Msc_RS_idx][k<<1] >= 0) && (ul_ref_sigs[0][0][Msc_RS_idx][(k<<1)+1] < 0))
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        txdataF[symbol_offset+carrier_pos] = (int32_t) 2;
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      else if ((ul_ref_sigs[0][0][Msc_RS_idx][k<<1] < 0) && (ul_ref_sigs[0][0][Msc_RS_idx][(k<<1)+1] >= 0))
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        txdataF[symbol_offset+carrier_pos] = (int32_t) 3;
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      else if ((ul_ref_sigs[0][0][Msc_RS_idx][k<<1] < 0) && (ul_ref_sigs[0][0][Msc_RS_idx][(k<<1)+1] < 0))
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        txdataF[symbol_offset+carrier_pos] = (int32_t) 1;
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      carrier_pos+=2;

      if (carrier_pos >= frame_parms->N_RB_UL*12)
        carrier_pos=0;
    }
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#endif
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    //  write_output("srs_txF.m","srstxF",&txdataF[symbol_offset],512,1,1);
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  }
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  return(0);
}

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int generate_srs_tx_emul(PHY_VARS_UE *phy_vars_ue,uint8_t subframe)
{
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  LOG_D(PHY,"[UE] generate_srs_tx_emul for subframe %d\n",subframe);
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  return(0);
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}

int generate_srs_rx(LTE_DL_FRAME_PARMS *frame_parms,
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                    SOUNDINGRS_UL_CONFIG_DEDICATED *soundingrs_ul_config_dedicated,
                    int *txdataF)
{
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  uint16_t msrsb=0,Nb=0,nb,b,msrs0=0,k,Msc_RS,Msc_RS_idx,carrier_pos;
  uint16_t *Msc_idx_ptr;
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  int k0;
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  uint8_t Bsrs  = soundingrs_ul_config_dedicated->srs_Bandwidth;
  uint8_t Csrs  = frame_parms->soundingrs_ul_config_common.srs_BandwidthConfig;
  uint8_t n_RRC = soundingrs_ul_config_dedicated->freqDomainPosition;
  uint8_t kTC   = soundingrs_ul_config_dedicated->transmissionComb;
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  if (frame_parms->N_RB_UL < 41) {
    msrs0 = msrsb_6_40[Csrs][0];
    msrsb = msrsb_6_40[Csrs][Bsrs];
    Nb    = Nb_6_40[Csrs][Bsrs];
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  } else if (frame_parms->N_RB_UL < 61) {
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    msrs0 = msrsb_41_60[Csrs][0];
    msrsb = msrsb_41_60[Csrs][Bsrs];
    Nb    = Nb_41_60[Csrs][Bsrs];
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  } else if (frame_parms->N_RB_UL < 81) {
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    msrs0 = msrsb_61_80[Csrs][0];
    msrsb = msrsb_61_80[Csrs][Bsrs];
    Nb    = Nb_61_80[Csrs][Bsrs];
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  } else if (frame_parms->N_RB_UL <111) {
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    msrs0 = msrsb_81_110[Csrs][0];
    msrsb = msrsb_81_110[Csrs][Bsrs];
    Nb    = Nb_81_110[Csrs][Bsrs];
  }

  Msc_RS = msrsb * 6;
  k0 = (((frame_parms->N_RB_UL>>1)-(msrs0>>1))*12) + kTC;
  nb  = (4*n_RRC/msrsb)%Nb;

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  for (b=0; b<=Bsrs; b++) {
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    k0 += 2*nb*Msc_RS;
  }

  if (k0<0) {
    msg("Invalid parameter set msrs0=%d, msrsb=%d, Nb=%d => nb=%d, k0=%d\n",msrs0,msrsb,Nb,nb,k0);
    return(-1);
  }

#ifdef USER_MODE
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  Msc_idx_ptr = (uint16_t*) bsearch((uint16_t*) &Msc_RS, (uint16_t*) dftsizes, 33, sizeof(uint16_t), compareints);
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  if (Msc_idx_ptr)
    Msc_RS_idx = Msc_idx_ptr - dftsizes;
  else {
    msg("generate_srs: index for Msc_RS=%d not found\n",Msc_RS);
    return(-1);
  }
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#else //stdlib not availiable in RTAI
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  if (Msc_RS==216)
    Msc_RS_idx = 12;
  else if (Msc_RS==144)
    Msc_RS_idx = 9;
  else {
    msg("generate_srs: index for Msc_RS=%d not implemented\n",Msc_RS);
    return(-1);
  }
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#endif

#ifdef DEBUG_SRS
  msg("generate_srs_rx: Msc_RS = %d, Msc_RS_idx = %d, k0=%d\n",Msc_RS, Msc_RS_idx,k0);
#endif

  carrier_pos = (frame_parms->first_carrier_offset + k0) % frame_parms->ofdm_symbol_size;

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  for (k=0; k<Msc_RS; k++) {
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    ((short*) txdataF)[carrier_pos<<2]   = ul_ref_sigs_rx[0][0][Msc_RS_idx][k<<2];
    ((short*) txdataF)[(carrier_pos<<2)+1] = ul_ref_sigs_rx[0][0][Msc_RS_idx][(k<<2)+1];
    ((short*) txdataF)[(carrier_pos<<2)+2] = ul_ref_sigs_rx[0][0][Msc_RS_idx][(k<<2)+2];
    ((short*) txdataF)[(carrier_pos<<2)+3] = ul_ref_sigs_rx[0][0][Msc_RS_idx][(k<<2)+3];
    carrier_pos+=2;
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    if (carrier_pos >= frame_parms->ofdm_symbol_size)
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      carrier_pos=1;
  }
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  /*
  for (k=0;k<Msc_RS;k++) {
    if ((ul_ref_sigs[0][0][Msc_RS_idx][k<<1] >= 0) && (ul_ref_sigs[0][0][Msc_RS_idx][(k<<1)+1] >= 0)) {
      ((short*) txdataF)[4*(symbol_offset + carrier_pos)] = ONE_OVER_SQRT2_Q15;
      ((short*) txdataF)[4*(symbol_offset + carrier_pos)+1] = ONE_OVER_SQRT2_Q15;
      ((short*) txdataF)[4*(symbol_offset + carrier_pos)+2] = -ONE_OVER_SQRT2_Q15;
      ((short*) txdataF)[4*(symbol_offset + carrier_pos)+3] = ONE_OVER_SQRT2_Q15;
    }
    else if ((ul_ref_sigs[0][0][Msc_RS_idx][k<<1] >= 0) && (ul_ref_sigs[0][0][Msc_RS_idx][(k<<1)+1] < 0)) {
      ((short*) txdataF)[4*(symbol_offset + carrier_pos)] = ONE_OVER_SQRT2_Q15;
      ((short*) txdataF)[4*(symbol_offset + carrier_pos)+1] = -ONE_OVER_SQRT2_Q15;
      ((short*) txdataF)[4*(symbol_offset + carrier_pos)+2] = ONE_OVER_SQRT2_Q15;
      ((short*) txdataF)[4*(symbol_offset + carrier_pos)+3] = ONE_OVER_SQRT2_Q15;
    }
    else if ((ul_ref_sigs[0][0][Msc_RS_idx][k<<1] < 0) && (ul_ref_sigs[0][0][Msc_RS_idx][(k<<1)+1] >= 0)) {
      ((short*) txdataF)[4*(symbol_offset + carrier_pos)] = -ONE_OVER_SQRT2_Q15;
      ((short*) txdataF)[4*(symbol_offset + carrier_pos)+1] = ONE_OVER_SQRT2_Q15;
      ((short*) txdataF)[4*(symbol_offset + carrier_pos)+2] = -ONE_OVER_SQRT2_Q15;
      ((short*) txdataF)[4*(symbol_offset + carrier_pos)+3] = -ONE_OVER_SQRT2_Q15;
    }
    else if ((ul_ref_sigs[0][0][Msc_RS_idx][k<<1] < 0) && (ul_ref_sigs[0][0][Msc_RS_idx][(k<<1)+1] < 0)) {
      ((short*) txdataF)[4*(symbol_offset + carrier_pos)] = -ONE_OVER_SQRT2_Q15;
      ((short*) txdataF)[4*(symbol_offset + carrier_pos)+1] = -ONE_OVER_SQRT2_Q15;
      ((short*) txdataF)[4*(symbol_offset + carrier_pos)+2] = ONE_OVER_SQRT2_Q15;
      ((short*) txdataF)[4*(symbol_offset + carrier_pos)+3] = -ONE_OVER_SQRT2_Q15;
    }

    carrier_pos+=2;
    if (carrier_pos >= frame_parms->ofdm_symbol_size)
      carrier_pos=0;
  }
  */

  //  write_output("srs_rx.m","srsrx",txdataF,1024,2,1);
  return(0);
}


#ifdef MAIN
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main()
{
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}
#endif