scansim.c 20.6 KB
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/*******************************************************************************
    OpenAirInterface 
    Copyright(c) 1999 - 2014 Eurecom

    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.


    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.

    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/>.

  Contact Information
  OpenAirInterface Admin: openair_admin@eurecom.fr
  OpenAirInterface Tech : openair_tech@eurecom.fr
  OpenAirInterface Dev  : openair4g-devel@eurecom.fr
  
  Address      : Eurecom, Campus SophiaTech, 450 Route des Chappes, CS 50193 - 06904 Biot Sophia Antipolis cedex, FRANCE

*******************************************************************************/
#include <string.h>
#include <math.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/mman.h>

#include "SIMULATION/TOOLS/defs.h"
#include "SIMULATION/RF/defs.h"
#include "PHY/types.h"
#include "PHY/defs.h"
#include "PHY/vars.h"
#include "MAC_INTERFACE/vars.h"

#ifdef EMOS
#include "SCHED/phy_procedures_emos.h"
#endif
#include "SCHED/defs.h"
#include "SCHED/vars.h"
#include "LAYER2/MAC/vars.h"

#ifdef XFORMS
#include "PHY/TOOLS/lte_phy_scope.h"
#endif

#include "OCG_vars.h"

#define BW 20.0


PHY_VARS_eNB *PHY_vars_eNb,*PHY_vars_eNb1,*PHY_vars_eNb2;
PHY_VARS_UE *PHY_vars_UE;

#define DLSCH_RB_ALLOC 0x1fbf // igore DC component,RB13

void lte_param_init(unsigned char N_tx, unsigned char N_rx,unsigned char transmission_mode,unsigned char extended_prefix_flag,unsigned char frame_type, uint16_t Nid_cell,uint8_t N_RB_DL,uint8_t osf) {

  //  unsigned int ind;
  LTE_DL_FRAME_PARMS *lte_frame_parms;
  int i;

  printf("Start lte_param_init\n");
  PHY_vars_eNb = malloc(sizeof(PHY_VARS_eNB));
  PHY_vars_eNb1 = malloc(sizeof(PHY_VARS_eNB));
  PHY_vars_eNb2 = malloc(sizeof(PHY_VARS_eNB));

  PHY_vars_UE = malloc(sizeof(PHY_VARS_UE));
  //PHY_config = malloc(sizeof(PHY_CONFIG));
  mac_xface = malloc(sizeof(MAC_xface));

  randominit(0);
  set_taus_seed(0);
  
  lte_frame_parms = &(PHY_vars_eNb->lte_frame_parms);

  lte_frame_parms->N_RB_DL            = N_RB_DL;   //50 for 10MHz and 25 for 5 MHz
  lte_frame_parms->N_RB_UL            = N_RB_DL;   
  lte_frame_parms->Ncp                = extended_prefix_flag;
  lte_frame_parms->Nid_cell           = Nid_cell;
  lte_frame_parms->nushift            = Nid_cell%6;
  lte_frame_parms->nb_antennas_tx     = N_tx;
  lte_frame_parms->nb_antennas_tx_eNB = N_tx;
  lte_frame_parms->nb_antennas_rx     = N_rx;
  //  lte_frame_parms->Csrs = 2;
  //  lte_frame_parms->Bsrs = 0;
  //  lte_frame_parms->kTC = 0;
  //  lte_frame_parms->n_RRC = 0;
  lte_frame_parms->mode1_flag = (transmission_mode == 1)? 1 : 0;
  lte_frame_parms->tdd_config = 3;
  lte_frame_parms->frame_type = frame_type;
  init_frame_parms(lte_frame_parms,osf);
  
  //copy_lte_parms_to_phy_framing(lte_frame_parms, &(PHY_config->PHY_framing));
  
  phy_init_top(lte_frame_parms); //allocation
  
  lte_frame_parms->twiddle_fft      = twiddle_fft;
  lte_frame_parms->twiddle_ifft     = twiddle_ifft;
  lte_frame_parms->rev              = rev;
  
  PHY_vars_UE->lte_frame_parms = *lte_frame_parms;

  phy_init_lte_top(lte_frame_parms);

  PHY_vars_UE->PHY_measurements.n_adj_cells=2;
  PHY_vars_UE->PHY_measurements.adj_cell_id[0] = Nid_cell+1;
  PHY_vars_UE->PHY_measurements.adj_cell_id[1] = Nid_cell+2;
  for (i=0;i<3;i++)
    lte_gold(lte_frame_parms,PHY_vars_UE->lte_gold_table[i],Nid_cell+i);    

  phy_init_lte_ue(PHY_vars_UE,1,0);

  phy_init_lte_eNB(PHY_vars_eNb,0,0,0);

  for (i=0;i<10;i++) {
    PHY_vars_UE->scan_info[0].amp[0][i] = 0;
    PHY_vars_UE->scan_info[0].amp[1][i] = 0;
    PHY_vars_UE->scan_info[0].amp[2][i] = 0;
  }
  memcpy((void*)&PHY_vars_eNb1->lte_frame_parms,(void*)&PHY_vars_eNb->lte_frame_parms,sizeof(LTE_DL_FRAME_PARMS));
  PHY_vars_eNb1->lte_frame_parms.Nid_cell=Nid_cell+1;
  PHY_vars_eNb1->lte_frame_parms.nushift=(Nid_cell+1)%6;
  PHY_vars_eNb1->Mod_id=1;

  memcpy((void*)&PHY_vars_eNb2->lte_frame_parms,(void*)&PHY_vars_eNb->lte_frame_parms,sizeof(LTE_DL_FRAME_PARMS));
  PHY_vars_eNb2->lte_frame_parms.Nid_cell=Nid_cell+2;
  PHY_vars_eNb2->lte_frame_parms.nushift=(Nid_cell+2)%6;
  PHY_vars_eNb2->Mod_id=2;

  phy_init_lte_eNB(PHY_vars_eNb1,0,0,0);
 
  phy_init_lte_eNB(PHY_vars_eNb2,0,0,0);

  phy_init_lte_top(lte_frame_parms);

  printf("Done lte_param_init\n");


}

mod_sym_t *dummybuf[4];
mod_sym_t dummy0[2048*14];
mod_sym_t dummy1[2048*14];
mod_sym_t dummy2[2048*14];
mod_sym_t dummy3[2048*14];


int main(int argc, char **argv) {

  char c;

  int i,l,aa;
  double sigma2, sigma2_dB=0,SNR,snr0=-2.0,snr1;
  uint8_t snr1set=0;
  //mod_sym_t **txdataF;
  int **txdata,**txdata1,**txdata2;
  double **s_re,**s_im,**s_re1,**s_im1,**s_re2,**s_im2,**r_re,**r_im,**r_re1,**r_im1,**r_re2,**r_im2;
  double iqim = 0.0;
  unsigned char pbch_pdu[6];
  //  int sync_pos, sync_pos_slot;
  //  FILE *rx_frame_file;
  FILE *output_fd;
  uint8_t write_output_file=0;
  int result;
  int freq_offset;
  //  int subframe_offset;
  //  char fname[40], vname[40];
  int trial, n_trials, ntrials=1, n_errors,n_errors2,n_alamouti;
  uint8_t transmission_mode = 1,n_tx=1,n_rx=1;
  uint16_t Nid_cell=0;

  int n_frames=1;
  channel_desc_t *eNB2UE,*eNB2UE1,*eNB2UE2;
  uint32_t nsymb,tx_lev,tx_lev1,tx_lev2;
  uint8_t extended_prefix_flag=0;
  LTE_DL_FRAME_PARMS *frame_parms;
#ifdef EMOS
  fifo_dump_emos emos_dump;
#endif

  FILE *input_fd=NULL,*pbch_file_fd=NULL;
  char input_val_str[50],input_val_str2[50];
  //  double input_val1,input_val2;
  //  uint16_t amask=0;
  uint8_t frame_mod4,num_pdcch_symbols;
  uint16_t NB_RB=25;

  SCM_t channel_model=AWGN;//Rayleigh1_anticorr;

  DCI_ALLOC_t dci_alloc[8];
  uint8_t abstraction_flag=0;//,calibration_flag=0;
  int pbch_tx_ant;
  uint8_t N_RB_DL=100,osf=1;

  unsigned char frame_type = FDD;
  unsigned char pbch_phase = 0;

#ifdef XFORMS
  FD_lte_phy_scope_ue *form_ue;
  char title[255];
#endif

  logInit();
  number_of_cards = 1;
  openair_daq_vars.rx_rf_mode = 1;
  
  /*
    rxdataF    = (int **)malloc16(2*sizeof(int*));
    rxdataF[0] = (int *)malloc16(FRAME_LENGTH_BYTES);
    rxdataF[1] = (int *)malloc16(FRAME_LENGTH_BYTES);
    
    rxdata    = (int **)malloc16(2*sizeof(int*));
    rxdata[0] = (int *)malloc16(FRAME_LENGTH_BYTES);
    rxdata[1] = (int *)malloc16(FRAME_LENGTH_BYTES);
  */
  while ((c = getopt (argc, argv, "f:hpf:g:n:s:S:t:x:y:z:N:F:GdP:")) != -1)
    {
      switch (c)
	{
	case 'f':
	  write_output_file=1;
	  output_fd = fopen(optarg,"w");
	  if (output_fd==NULL) {
	    printf("Error opening %s\n",optarg);
	    exit(-1);
	  }
	  break;
	case 'd':
	  frame_type = TDD;
	  break;
	case 'g':
	  switch((char)*optarg) {
	  case 'A': 
	    channel_model=SCM_A;
	    break;
	  case 'B': 
	    channel_model=SCM_B;
	    break;
	  case 'C': 
	    channel_model=SCM_C;
	    break;
	  case 'D': 
	    channel_model=SCM_D;
	    break;
	  case 'E': 
	    channel_model=EPA;
	    break;
	  case 'F': 
	    channel_model=EVA;
	    break;
	  case 'G': 
	    channel_model=ETU;
	    break;
	  default:
	    msg("Unsupported channel model!\n");
	    exit(-1);
	  }
	  break;
	case 'n':
	  n_frames = atoi(optarg);
	  break;
	case 's':
	  snr0 = atof(optarg);
	  msg("Setting SNR0 to %f\n",snr0);
	  break;
	case 'S':
	  snr1 = atof(optarg);
	  snr1set=1;
	  msg("Setting SNR1 to %f\n",snr1);
	  break;
	  /*
	    case 't':
	    Td= atof(optarg);
	    break;
	  */
	case 'p':
	  extended_prefix_flag=1;
	  break;
	  /*
	    case 'r':
	    ricean_factor = pow(10,-.1*atof(optarg));
	    if (ricean_factor>1) {
	    printf("Ricean factor must be between 0 and 1\n");
	    exit(-1);
	    }
	    break;
	  */
	case 'x':
	  transmission_mode=atoi(optarg);
	  if ((transmission_mode!=1) &&
	      (transmission_mode!=2) &&
	      (transmission_mode!=6)) {
	    msg("Unsupported transmission mode %d\n",transmission_mode);
	    exit(-1);
	  }
	  break;
	case 'y':
	  n_tx=atoi(optarg);
	  if ((n_tx==0) || (n_tx>2)) {
	    msg("Unsupported number of tx antennas %d\n",n_tx);
	    exit(-1);
	  }
	  break;
	case 'z':
	  n_rx=atoi(optarg);
	  if ((n_rx==0) || (n_rx>2)) {
	    msg("Unsupported number of rx antennas %d\n",n_rx);
	    exit(-1);
	  }
	  break;
	case 'A':
	  abstraction_flag=1;
	  ntrials=10000;
	  msg("Running Abstraction test\n");
	  pbch_file_fd=fopen(optarg,"r");
	  if (pbch_file_fd==NULL) {
	    printf("Problem with filename %s\n",optarg);
	    exit(-1);
	  }
	  break;
	  //	case 'C':
	  //	  calibration_flag=1;
	  //	  msg("Running Abstraction calibration for Bias removal\n");
	  //	  break;
	case 'N':
	  Nid_cell = atoi(optarg);
	  break;
	case 'F':
	  input_fd = fopen(optarg,"r");
	  if (input_fd==NULL) {
	    printf("Problem with filename %s\n",optarg);
	    exit(-1);
	  }
	  break;
	case 'P':
	  pbch_phase = atoi(optarg);
	  if (pbch_phase>3)
	    printf("Illegal PBCH phase (0-3) got %d\n",pbch_phase);
	  break;
	default:
	case 'h':
	  printf("%s -h(elp) -p(extended_prefix) -N cell_id -f output_filename -F input_filename -g channel_model -n n_frames -t Delayspread -s snr0 -S snr1 -x transmission_mode -y TXant -z RXant -N CellId\n",argv[0]);
	  printf("-h This message\n");
	  printf("-p Use extended prefix mode\n");
	  printf("-d Use TDD\n");
	  printf("-n Number of frames to simulate\n");
	  printf("-s Starting SNR, runs from SNR0 to SNR0 + 5 dB.  If n_frames is 1 then just SNR is simulated\n");
	  printf("-S Ending SNR, runs from SNR0 to SNR1\n");
	  printf("-t Delay spread for multipath channel\n");
	  printf("-g [A,B,C,D,E,F,G] Use 3GPP SCM (A,B,C,D) or 36-101 (E-EPA,F-EVA,G-ETU) models (ignores delay spread and Ricean factor)\n");
	  printf("-x Transmission mode (1,2,6 for the moment)\n");
	  printf("-y Number of TX antennas used in eNB\n");
	  printf("-z Number of RX antennas used in UE\n");
	  printf("-N Nid_cell\n");
	  printf("-f Output filename (.txt format) for Pe/SNR results\n");
	  printf("-F Input filename (.txt format) for RX conformance testing\n");
	  exit (-1);
	  break;
	}
    }

  if (transmission_mode>=2)
    n_tx=2;

  lte_param_init(n_tx,n_rx,transmission_mode,extended_prefix_flag,frame_type,Nid_cell,N_RB_DL,osf);

#ifdef XFORMS
  fl_initialize (&argc, argv, NULL, 0, 0);
  form_ue = create_lte_phy_scope_ue();
  sprintf (title, "LTE PHY SCOPE UE");
  fl_show_form (form_ue->lte_phy_scope_ue, FL_PLACE_HOTSPOT, FL_FULLBORDER, title);  
#endif

  if (snr1set==0) {
    if (n_frames==1)
      snr1 = snr0+.1;
    else
      snr1 = snr0+5.0;
  }

  printf("SNR0 %f, SNR1 %f\n",snr0,snr1);

  frame_parms = &PHY_vars_eNb->lte_frame_parms;



  txdata = PHY_vars_eNb->lte_eNB_common_vars.txdata[0];
  txdata1 = PHY_vars_eNb1->lte_eNB_common_vars.txdata[0];
  txdata2 = PHY_vars_eNb2->lte_eNB_common_vars.txdata[0];

  
  s_re = malloc(2*sizeof(double*));
  s_im = malloc(2*sizeof(double*));
  s_re1 = malloc(2*sizeof(double*));
  s_im1 = malloc(2*sizeof(double*));
  s_re2 = malloc(2*sizeof(double*));
  s_im2 = malloc(2*sizeof(double*));
  r_re = malloc(2*sizeof(double*));
  r_im = malloc(2*sizeof(double*));
  r_re1 = malloc(2*sizeof(double*));
  r_im1 = malloc(2*sizeof(double*));
  r_re2 = malloc(2*sizeof(double*));
  r_im2 = malloc(2*sizeof(double*));

  nsymb = (frame_parms->Ncp == 0) ? 14 : 12;

  printf("FFT Size %d, Extended Prefix %d, Samples per subframe %d, Symbols per subframe %d\n",NUMBER_OF_OFDM_CARRIERS,
	 frame_parms->Ncp,frame_parms->samples_per_tti,nsymb);

  printf("PHY_vars_eNb1->lte_eNB_common_vars.txdataF[0][0] = %p\n",
	 PHY_vars_eNb1->lte_eNB_common_vars.txdataF[0][0]);


  DLSCH_alloc_pdu2.rah              = 0;
  DLSCH_alloc_pdu2.rballoc          = DLSCH_RB_ALLOC;
  DLSCH_alloc_pdu2.TPC              = 0;
  DLSCH_alloc_pdu2.dai              = 0;
  DLSCH_alloc_pdu2.harq_pid         = 0;
  DLSCH_alloc_pdu2.tb_swap          = 0;
  DLSCH_alloc_pdu2.mcs1             = 0;  
  DLSCH_alloc_pdu2.ndi1             = 1;
  DLSCH_alloc_pdu2.rv1              = 0;
  // Forget second codeword
  DLSCH_alloc_pdu2.tpmi             = (transmission_mode==6 ? 5 : 0) ;  // precoding

  eNB2UE = new_channel_desc_scm(PHY_vars_eNb->lte_frame_parms.nb_antennas_tx,
				PHY_vars_UE->lte_frame_parms.nb_antennas_rx,
				channel_model,
				BW,
				0,
				0,
				0);


  if (eNB2UE==NULL) {
    msg("Problem generating channel model. Exiting.\n");
    exit(-1);
  }

  for (i=0;i<2;i++) {

    s_re[i] = malloc(FRAME_LENGTH_COMPLEX_SAMPLES*sizeof(double));
    bzero(s_re[i],FRAME_LENGTH_COMPLEX_SAMPLES*sizeof(double));
    s_im[i] = malloc(FRAME_LENGTH_COMPLEX_SAMPLES*sizeof(double));
    bzero(s_im[i],FRAME_LENGTH_COMPLEX_SAMPLES*sizeof(double));
    s_re1[i] = malloc(FRAME_LENGTH_COMPLEX_SAMPLES*sizeof(double));
    bzero(s_re1[i],FRAME_LENGTH_COMPLEX_SAMPLES*sizeof(double));
    s_im1[i] = malloc(FRAME_LENGTH_COMPLEX_SAMPLES*sizeof(double));
    bzero(s_im1[i],FRAME_LENGTH_COMPLEX_SAMPLES*sizeof(double));    
    s_re2[i] = malloc(FRAME_LENGTH_COMPLEX_SAMPLES*sizeof(double));
    bzero(s_re2[i],FRAME_LENGTH_COMPLEX_SAMPLES*sizeof(double));
    s_im2[i] = malloc(FRAME_LENGTH_COMPLEX_SAMPLES*sizeof(double));
    bzero(s_im2[i],FRAME_LENGTH_COMPLEX_SAMPLES*sizeof(double));

    r_re[i] = malloc(FRAME_LENGTH_COMPLEX_SAMPLES*sizeof(double));
    bzero(r_re[i],FRAME_LENGTH_COMPLEX_SAMPLES*sizeof(double));
    r_im[i] = malloc(FRAME_LENGTH_COMPLEX_SAMPLES*sizeof(double));
    bzero(r_im[i],FRAME_LENGTH_COMPLEX_SAMPLES*sizeof(double));
    r_re1[i] = malloc(FRAME_LENGTH_COMPLEX_SAMPLES*sizeof(double));
    bzero(r_re1[i],FRAME_LENGTH_COMPLEX_SAMPLES*sizeof(double));
    r_im1[i] = malloc(FRAME_LENGTH_COMPLEX_SAMPLES*sizeof(double));
    bzero(r_im1[i],FRAME_LENGTH_COMPLEX_SAMPLES*sizeof(double));
    r_re2[i] = malloc(FRAME_LENGTH_COMPLEX_SAMPLES*sizeof(double));
    bzero(r_re2[i],FRAME_LENGTH_COMPLEX_SAMPLES*sizeof(double));
    r_im2[i] = malloc(FRAME_LENGTH_COMPLEX_SAMPLES*sizeof(double));
    bzero(r_im2[i],FRAME_LENGTH_COMPLEX_SAMPLES*sizeof(double));
  }
  pbch_pdu[0]=100;
  pbch_pdu[1]=1;
  pbch_pdu[2]=0;
  
  if (PHY_vars_eNb->lte_frame_parms.frame_type == FDD) {
    generate_pss(PHY_vars_eNb->lte_eNB_common_vars.txdataF[0],
		 AMP,
		 &PHY_vars_eNb->lte_frame_parms,
		 (PHY_vars_eNb->lte_frame_parms.Ncp==NORMAL) ? 6 : 5,
		 0);
    generate_sss(PHY_vars_eNb->lte_eNB_common_vars.txdataF[0],
		 AMP,
		 &PHY_vars_eNb->lte_frame_parms,
		 (PHY_vars_eNb->lte_frame_parms.Ncp==0) ? 5 : 4,
		 0);
    generate_pss(PHY_vars_eNb->lte_eNB_common_vars.txdataF[0],
		 AMP,
		 &PHY_vars_eNb->lte_frame_parms,
		 (PHY_vars_eNb->lte_frame_parms.Ncp==0) ? 6 : 5,
		 10);
    generate_sss(PHY_vars_eNb->lte_eNB_common_vars.txdataF[0],
		 AMP,
		 &PHY_vars_eNb->lte_frame_parms,
		 (PHY_vars_eNb->lte_frame_parms.Ncp==0) ? 5 : 4,
		 10);
    
  }
  else {
    generate_sss(PHY_vars_eNb->lte_eNB_common_vars.txdataF[0],
		 AMP,
		 &PHY_vars_eNb->lte_frame_parms,
		 (PHY_vars_eNb->lte_frame_parms.Ncp==0) ? 6 : 5,
		 1);
    generate_pss(PHY_vars_eNb->lte_eNB_common_vars.txdataF[0],
		 AMP,
		 &PHY_vars_eNb->lte_frame_parms,
		 2,
		 2);
    generate_sss(PHY_vars_eNb->lte_eNB_common_vars.txdataF[0],
		 AMP,
		 &PHY_vars_eNb->lte_frame_parms,
		 (PHY_vars_eNb->lte_frame_parms.Ncp==0) ? 6 : 5,
		 11);
    generate_pss(PHY_vars_eNb->lte_eNB_common_vars.txdataF[0],
		 AMP,
		 &PHY_vars_eNb->lte_frame_parms,
		 2,
		 12);
    
    
  }
  
  
  /*
  generate_pilots(PHY_vars_eNb,
		  PHY_vars_eNb->lte_eNB_common_vars.txdataF[0],
		  AMP,
		  LTE_NUMBER_OF_SUBFRAMES_PER_FRAME);
  
  
   
     num_pdcch_symbols = generate_dci_top(1,
     0,
     dci_alloc,
     0,
     1024,
     &PHY_vars_eNb->lte_frame_parms,
     PHY_vars_eNb->lte_eNB_common_vars.txdataF[0],
     0);
  */
  
  /*  
  if (num_pdcch_symbols<3) {
    printf("Less than 3 pdcch symbols\n");
    //  exit(-1);
  }
  
  if (pbch_phase>0) {
    dummybuf[0] = dummy0;
    dummybuf[1] = dummy1;
    dummybuf[2] = dummy2;
    dummybuf[3] = dummy3;
    generate_pbch(&PHY_vars_eNb->lte_eNB_pbch,
		  (mod_sym_t**)dummybuf,
		  AMP,
		  &PHY_vars_eNb->lte_frame_parms,
		  pbch_pdu,
		  0);
  }
  
  generate_pbch(&PHY_vars_eNb->lte_eNB_pbch,
		PHY_vars_eNb->lte_eNB_common_vars.txdataF[0],
		AMP,
		&PHY_vars_eNb->lte_frame_parms,
		pbch_pdu,
		pbch_phase);
  */
  write_output("txsigF0.m","txsF0", PHY_vars_eNb->lte_eNB_common_vars.txdataF[0][0],FRAME_LENGTH_COMPLEX_SAMPLES_NO_PREFIX,1,1);
  if (PHY_vars_eNb->lte_frame_parms.nb_antennas_tx>1)
    write_output("txsigF1.m","txsF1", PHY_vars_eNb->lte_eNB_common_vars.txdataF[0][1],FRAME_LENGTH_COMPLEX_SAMPLES_NO_PREFIX,1,1);
    
  tx_lev = 0;
  tx_lev1 = 0;
  tx_lev2 = 0;

    
    
    
  for (aa=0; aa<PHY_vars_eNb->lte_frame_parms.nb_antennas_tx; aa++) {
    if (frame_parms->Ncp == 1) 
      PHY_ofdm_mod(PHY_vars_eNb->lte_eNB_common_vars.txdataF[0][aa],        // input,
		   txdata[aa],         // output
		   frame_parms->log2_symbol_size,                // log2_fft_size
		   LTE_NUMBER_OF_SUBFRAMES_PER_FRAME*nsymb,                 // number of symbols
		   frame_parms->nb_prefix_samples,               // number of prefix samples
		   frame_parms->twiddle_ifft,  // IFFT twiddle factors
		   frame_parms->rev,           // bit-reversal permutation
		   CYCLIC_PREFIX);
    else {
      normal_prefix_mod(PHY_vars_eNb->lte_eNB_common_vars.txdataF[0][aa],
			txdata[aa],
			LTE_NUMBER_OF_SUBFRAMES_PER_FRAME*nsymb,
			frame_parms);
    }
      
    tx_lev += signal_energy(&txdata[aa][frame_parms->samples_per_tti/2],
			    OFDM_SYMBOL_SIZE_COMPLEX_SAMPLES);
  }

    
  write_output("txsig0.m","txs0", txdata[0],FRAME_LENGTH_COMPLEX_SAMPLES,1,1);
  if (frame_parms->nb_antennas_tx>1)
    write_output("txsig1.m","txs1", txdata[1],FRAME_LENGTH_COMPLEX_SAMPLES,1,1);

  // multipath channel
  
  for (i=0;i<2*nsymb*OFDM_SYMBOL_SIZE_COMPLEX_SAMPLES;i++) {
    for (aa=0;aa<PHY_vars_eNb->lte_frame_parms.nb_antennas_tx;aa++) {
      s_re[aa][i] = ((double)(((short *)txdata[aa]))[(i<<1)]);
      s_im[aa][i] = ((double)(((short *)txdata[aa]))[(i<<1)+1]);
    }
  }


  for (SNR=snr0;SNR<snr1;SNR+=.2) {


    n_errors = 0;
    n_errors2 = 0;
    n_alamouti = 0;
    for (trial=0; trial<n_frames; trial++) {

      multipath_channel(eNB2UE,s_re,s_im,r_re,r_im,
			  2*nsymb*OFDM_SYMBOL_SIZE_COMPLEX_SAMPLES,0);
      
      sigma2_dB = 10*log10((double)tx_lev) +10*log10((double)PHY_vars_eNb->lte_frame_parms.ofdm_symbol_size/(double)(12*NB_RB)) - SNR;
      if (n_frames==1)
	printf("sigma2_dB %f (SNR %f dB) tx_lev_dB %f,%f,%f\n",sigma2_dB,SNR,
	       10*log10((double)tx_lev),
	       10*log10((double)tx_lev1),
	       10*log10((double)tx_lev2));
      //AWGN
      sigma2 = pow(10,sigma2_dB/10);
        
      /*    
	    if (n_frames==1) {
	    printf("rx_level data symbol %f, tx_lev %f\n",
	    10*log10(signal_energy_fp(r_re,r_im,1,OFDM_SYMBOL_SIZE_COMPLEX_SAMPLES,0)),
	    10*log10(tx_lev));
	    }
      */
      
      for (n_trials=0;n_trials<ntrials;n_trials++) {
	//printf("n_trial %d\n",n_trials);
	for (i=0; i<2*nsymb*OFDM_SYMBOL_SIZE_COMPLEX_SAMPLES; i++) {
	  for (aa=0;aa<PHY_vars_eNb->lte_frame_parms.nb_antennas_rx;aa++) {
	    ((short*) PHY_vars_UE->lte_ue_common_vars.rxdata[aa])[2*i] = (short) (.167*(r_re[aa][i] +sqrt(sigma2/2)*gaussdouble(0.0,1.0)));
	    ((short*) PHY_vars_UE->lte_ue_common_vars.rxdata[aa])[2*i+1] = (short) (.167*(r_im[aa][i] + (iqim*r_re[aa][i]) + sqrt(sigma2/2)*gaussdouble(0.0,1.0)));
	  }
	}    

	lte_sync_timefreq(PHY_vars_UE,0,2680000000);

	if (n_frames==1) {
	  printf("rx_level data symbol %f\n",
		 10*log10(signal_energy(&PHY_vars_UE->lte_ue_common_vars.rxdata[0][frame_parms->samples_per_tti/2],4*OFDM_SYMBOL_SIZE_COMPLEX_SAMPLES)));
	}
	

      } //noise trials
    } // trials
    if (abstraction_flag==0) {
      printf("SNR %f : n_errors2 = %d/%d (BLER %e,40ms BLER %e,%d,%d), n_alamouti %d\n", SNR,n_errors2,ntrials*(1+trial),(double)n_errors2/(ntrials*(1+trial)),pow((double)n_errors2/(ntrials*(1+trial)),4),ntrials,trial,n_alamouti);
      if (write_output_file==1)
	fprintf(output_fd,"%f %e\n",SNR,(double)n_errors2/(ntrials*(1+trial)));
    }
  } // NSR

  if (n_frames==1) {

  }


  for (i=0;i<2;i++) {
    free(s_re[i]);
    free(s_im[i]);
    free(r_re[i]);
    free(r_im[i]);
  }
  free(s_re);
  free(s_im);
  free(r_re);
  free(r_im);


  lte_sync_time_free();

  if (write_output_file)
    fclose(output_fd);

  return(n_errors);

}
   


/*  
    for (i=1;i<4;i++)
    memcpy((void *)&PHY_vars->tx_vars[0].TX_DMA_BUFFER[i*12*OFDM_SYMBOL_SIZE_COMPLEX_SAMPLES_NO_PREFIX*2],
    (void *)&PHY_vars->tx_vars[0].TX_DMA_BUFFER[0],
    12*OFDM_SYMBOL_SIZE_SAMPLES_NO_PREFIX*2);
*/