beamforming.c

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/*! \file PHY/MODULATION/beamforming.c
 * \brief 
 * \author X. JIANG, F. Kaltenberger, R. KNOPP
 * \date 2016
 * \version 0.1
 * \company Eurecom
 * \email: xiwen.jiang@eurecom.fr,florian.kaltenberger@eurecom.fr,raymond.knopp@eurecom.fr
 * \note
 * \warning
 */
#include "PHY/defs.h"
#include "PHY/extern.h"
#include "PHY/CODING/defs.h"
#include "PHY/CODING/extern.h"
#include "PHY/CODING/lte_interleaver_inline.h"
#include "PHY/LTE_TRANSPORT/defs.h"
#include "defs.h"
#include "UTIL/LOG/vcd_signal_dumper.h"

int beam_precoding(int32_t **txdataF,
	           int32_t **txdataF_BF,
                   LTE_DL_FRAME_PARMS *frame_parms,
	           int32_t ***beam_weights,
                   int slot,
                   int symbol,
                   int aa)
{
  uint8_t p;
  uint16_t re=0;
  int slot_offset_F;
  
  slot_offset_F = slot*(frame_parms->ofdm_symbol_size)*((frame_parms->Ncp==1) ? 6 : 7);

  // clear txdata_BF[aa][re] for each call of ue_spec_beamforming
  memset(txdataF_BF[aa],0,sizeof(int32_t)*(frame_parms->ofdm_symbol_size));

  for (p=0; p<14; p++) {
    //if (p==0 || p==1 || p==5 || p>7)
    //  mult_cpx_conj_vector((int16_t*)txdataF[p], (int16_t*)beam_weights[p][aa], (int16_t*)txdataF_BF[aa], frame_parms->ofdm_symbol_size, 15);
    if (txdataF[p]) {//[slot_offset_F+symbol*frame_parms->ofdm_symbol_size+re]!=0) {

      for (re=0;re<frame_parms->ofdm_symbol_size;re++) {
        ((int16_t*)&txdataF_BF[aa][re])[0] += (int16_t)((((int16_t*)&txdataF[p][slot_offset_F+symbol*frame_parms->ofdm_symbol_size+re])[0]*((int16_t*)&beam_weights[p][aa][re])[0])>>15);
        ((int16_t*)&txdataF_BF[aa][re])[0] -= (int16_t)((((int16_t*)&txdataF[p][slot_offset_F+symbol*frame_parms->ofdm_symbol_size+re])[1]*((int16_t*)&beam_weights[p][aa][re])[1])>>15);
        ((int16_t*)&txdataF_BF[aa][re])[1] += (int16_t)((((int16_t*)&txdataF[p][slot_offset_F+symbol*frame_parms->ofdm_symbol_size+re])[0]*((int16_t*)&beam_weights[p][aa][re])[1])>>15);
        ((int16_t*)&txdataF_BF[aa][re])[1] += (int16_t)((((int16_t*)&txdataF[p][slot_offset_F+symbol*frame_parms->ofdm_symbol_size+re])[1]*((int16_t*)&beam_weights[p][aa][re])[0])>>15);
	
	/*
          printf("beamforming.c:txdataF[%d][%d]=%d+j%d, beam_weights[%d][%d][%d]=%d+j%d,txdata_BF[%d][%d]=%d+j%d\n",
	  p,slot_offset_F+symbol*frame_parms->ofdm_symbol_size+re,
	  ((int16_t*)&txdataF[p][slot_offset_F+symbol*frame_parms->ofdm_symbol_size+re])[0],
	  ((int16_t*)&txdataF[p][slot_offset_F+symbol*frame_parms->ofdm_symbol_size+re])[1],
	  p,aa,re,
	  ((int16_t*)&beam_weights[p][aa][re])[0],((int16_t*)&beam_weights[p][aa][re])[1],
	  aa,re,
	  ((int16_t*)&txdataF_BF[aa][re])[0],
	  ((int16_t*)&txdataF_BF[aa][re])[1]); 
	*/
      } 
    }
  }
  return 0;
}