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/*******************************************************************************
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    OpenAirInterface 
    Copyright(c) 1999 - 2014 Eurecom
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    OpenAirInterface is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
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    (at your option) any later version.
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    OpenAirInterface is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.
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    You should have received a copy of the GNU General Public License
    along with OpenAirInterface.The full GNU General Public License is 
   included in this distribution in the file called "COPYING". If not, 
   see <http://www.gnu.org/licenses/>.
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  Contact Information
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  OpenAirInterface Admin: openair_admin@eurecom.fr
  OpenAirInterface Tech : openair_tech@eurecom.fr
  OpenAirInterface Dev  : openair4g-devel@eurecom.fr
  
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  Address      : Eurecom, Campus SophiaTech, 450 Route des Chappes, CS 50193 - 06904 Biot Sophia Antipolis cedex, FRANCE
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 *******************************************************************************/
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/*! \file PHY/LTE_TRANSPORT/dci.c
* \brief Implements PDCCH physical channel TX/RX procedures (36.211) and DCI encoding/decoding (36.212/36.213). Current LTE compliance V8.6 2009-03.
* \author R. Knopp
* \date 2011
* \version 0.1
* \company Eurecom
* \email: knopp@eurecom.fr
* \note
* \warning
*/
#ifdef USER_MODE
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#endif
#include "PHY/defs.h"
#include "PHY/extern.h"
#include "SCHED/defs.h"
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#include "SIMULATION/TOOLS/defs.h" // for taus 
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#include <emmintrin.h>
#include <xmmintrin.h>
#ifdef __SSE3__
#include <pmmintrin.h>
#include <tmmintrin.h>
#endif

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#include "assertions.h"
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//#define DEBUG_DCI_ENCODING 1
//#define DEBUG_DCI_DECODING 1
//#define DEBUG_PHY
 
//#undef ALL_AGGREGATION

#ifndef __SSE3__
__m128i zero2;
#define _mm_abs_epi16(xmmx) _mm_xor_si128((xmmx),_mm_cmpgt_epi16(zero2,(xmmx)))
#define _mm_sign_epi16(xmmx,xmmy) _mm_xor_si128((xmmx),_mm_cmpgt_epi16(zero2,(xmmy)))
#endif

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//extern uint16_t phich_reg[MAX_NUM_PHICH_GROUPS][3];
//extern uint16_t pcfich_reg[4];
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uint32_t check_phich_reg(LTE_DL_FRAME_PARMS *frame_parms,uint32_t kprime,uint8_t lprime,uint8_t mi) {
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  uint16_t i;
  uint16_t Ngroup_PHICH = (frame_parms->phich_config_common.phich_resource*frame_parms->N_RB_DL)/48;
  uint16_t mprime;
  uint16_t *pcfich_reg = frame_parms->pcfich_reg;
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  if ((lprime>0) && (frame_parms->Ncp==0) )
    return(0);

  //  printf("check_phich_reg : mi %d\n",mi);

  // compute REG based on symbol
  if ((lprime == 0)||
      ((lprime==1)&&(frame_parms->nb_antennas_tx_eNB == 4)))
    mprime = kprime/6;
  else
    mprime = kprime>>2;

  // check if PCFICH uses mprime
  if ((lprime==0) && 
      ((mprime == pcfich_reg[0]) ||
       (mprime == pcfich_reg[1]) ||
       (mprime == pcfich_reg[2]) ||
       (mprime == pcfich_reg[3]))) {
#ifdef DEBUG_DCI_ENCODING
    msg("[PHY] REG %d allocated to PCFICH\n",mprime);
#endif
    return(1);
  }

  // handle Special subframe case for TDD !!!

  //  printf("Checking phich_reg %d\n",mprime);
  if (mi > 0) {
    if (((frame_parms->phich_config_common.phich_resource*frame_parms->N_RB_DL)%48) > 0)
      Ngroup_PHICH++;
    
    if (frame_parms->Ncp == 1) {
      Ngroup_PHICH<<=1;
    }
    
    
    
    for (i=0;i<Ngroup_PHICH;i++) {
      if ((mprime == frame_parms->phich_reg[i][0]) || 
	  (mprime == frame_parms->phich_reg[i][1]) || 
	  (mprime == frame_parms->phich_reg[i][2]))  {
#ifdef DEBUG_DCI_ENCODING
	msg("[PHY] REG %d (lprime %d) allocated to PHICH\n",mprime,lprime);
#endif
	return(1);
      }
    }
  }
  return(0);
}

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uint16_t extract_crc(uint8_t *dci,uint8_t dci_len) {
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  uint16_t crc16;
  //  uint8_t i;
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  /*
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  uint8_t crc;
  crc = ((uint16_t *)dci)[DCI_LENGTH>>4];
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  printf("crc1: %x, shift %d (DCI_LENGTH %d)\n",crc,DCI_LENGTH&0xf,DCI_LENGTH);
  crc = (crc>>(DCI_LENGTH&0xf));
  // clear crc bits
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  ((uint16_t *)dci)[DCI_LENGTH>>4] &= (0xffff>>(16-(DCI_LENGTH&0xf)));
  printf("crc2: %x, dci0 %x\n",crc,((int16_t *)dci)[DCI_LENGTH>>4]);
  crc |= (((uint16_t *)dci)[1+(DCI_LENGTH>>4)])<<(16-(DCI_LENGTH&0xf));
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  // clear crc bits
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  (((uint16_t *)dci)[1+(DCI_LENGTH>>4)]) = 0;
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  printf("extract_crc: crc %x\n",crc);
  */
#ifdef DEBUG_DCI_DECODING  
  msg("dci_crc (%x,%x,%x), dci_len&0x7=%d\n",dci[dci_len>>3],dci[1+(dci_len>>3)],dci[2+(dci_len>>3)],
	 dci_len&0x7);
#endif
  if ((dci_len&0x7) > 0) {
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    ((uint8_t *)&crc16)[0] = dci[1+(dci_len>>3)]<<(dci_len&0x7) | dci[2+(dci_len>>3)]>>(8-(dci_len&0x7));
    ((uint8_t *)&crc16)[1] = dci[(dci_len>>3)]<<(dci_len&0x7) | dci[1+(dci_len>>3)]>>(8-(dci_len&0x7));
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  }
  else {
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    ((uint8_t *)&crc16)[0] = dci[1+(dci_len>>3)];
    ((uint8_t *)&crc16)[1] = dci[(dci_len>>3)];
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  }

#ifdef DEBUG_DCI_DECODING  
  msg("dci_crc =>%x\n",crc16);
#endif

  //  dci[(dci_len>>3)]&=(0xffff<<(dci_len&0xf));
  //  dci[(dci_len>>3)+1] = 0;
  //  dci[(dci_len>>3)+2] = 0;
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  return((uint16_t)crc16);
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}



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static uint8_t d[3*(MAX_DCI_SIZE_BITS + 16) + 96];
static uint8_t w[3*3*(MAX_DCI_SIZE_BITS+16)];
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void dci_encoding(uint8_t *a,
		  uint8_t A,
		  uint16_t E,
		  uint8_t *e,
		  uint16_t rnti) {
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  uint8_t D = (A + 16);
  uint32_t RCC;
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#ifdef DEBUG_DCI_ENCODING
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  int32_t i;
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#endif
  // encode dci 

#ifdef DEBUG_DCI_ENCODING
  msg("Doing DCI encoding for %d bits, e %p, rnti %x\n",A,e,rnti);
#endif

  memset((void *)d,LTE_NULL,96);

  ccodelte_encode(A,2,a,d+96,rnti);

#ifdef DEBUG_DCI_ENCODING
  for (i=0;i<16+A;i++)
    msg("%d : (%d,%d,%d)\n",i,*(d+96+(3*i)),*(d+97+(3*i)),*(d+98+(3*i)));
#endif
  
#ifdef DEBUG_DCI_ENCODING
  msg("Doing DCI interleaving for %d coded bits, e %p\n",D*3,e);
#endif
  RCC = sub_block_interleaving_cc(D,d+96,w);

#ifdef DEBUG_DCI_ENCODING
  msg("Doing DCI rate matching for %d channel bits, RCC %d, e %p\n",E,RCC,e);
#endif
  lte_rate_matching_cc(RCC,E,w,e);


}


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uint8_t *generate_dci0(uint8_t *dci,
		  uint8_t *e,
		  uint8_t DCI_LENGTH,
		  uint8_t aggregation_level,
		  uint16_t rnti) {
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  uint16_t coded_bits;
  uint8_t dci_flip[8];
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  if (aggregation_level>3) {
    msg("dci.c: generate_dci FATAL, illegal aggregation_level %d\n",aggregation_level);
    return NULL;
  }

  coded_bits = 72 * (1<<aggregation_level);
  /*  

#ifdef DEBUG_DCI_ENCODING
  for (i=0;i<1+((DCI_LENGTH+16)/8);i++)
    msg("i %d : %x\n",i,dci[i]);
#endif
  */
  if (DCI_LENGTH<=32){
    dci_flip[0] = dci[3];
    dci_flip[1] = dci[2];
    dci_flip[2] = dci[1];
    dci_flip[3] = dci[0];   
  }
  else {
    dci_flip[0] = dci[7];
    dci_flip[1] = dci[6];
    dci_flip[2] = dci[5];
    dci_flip[3] = dci[4];
    dci_flip[4] = dci[3];
    dci_flip[5] = dci[2];
    dci_flip[6] = dci[1];
    dci_flip[7] = dci[0];
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#ifdef DEBUG_DCI_ENCODING
	    msg("DCI => %x,%x,%x,%x,%x,%x,%x,%x\n",
		dci_flip[0],dci_flip[1],dci_flip[2],dci_flip[3],
		dci_flip[4],dci_flip[5],dci_flip[6],dci_flip[7]);
#endif
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  }
	
  dci_encoding(dci_flip,DCI_LENGTH,coded_bits,e,rnti);

  return(e+coded_bits);
}

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uint32_t Y;
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#define CCEBITS 72
#define CCEPERSYMBOL 33  // This is for 1200 RE
#define CCEPERSYMBOL0 22  // This is for 1200 RE
#define DCI_BITS_MAX ((2*CCEPERSYMBOL+CCEPERSYMBOL0)*CCEBITS)
#define Msymb (DCI_BITS_MAX/2)
//#define Mquad (Msymb/4)

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static uint32_t bitrev_cc_dci[32] = {1,17,9,25,5,21,13,29,3,19,11,27,7,23,15,31,0,16,8,24,4,20,12,28,2,18,10,26,6,22,14,30};
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static mod_sym_t wtemp[2][Msymb];

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void pdcch_interleaving(LTE_DL_FRAME_PARMS *frame_parms,mod_sym_t **z, mod_sym_t **wbar,uint8_t n_symbols_pdcch,uint8_t mi) {
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  mod_sym_t *wptr,*wptr2,*zptr;
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  uint32_t Mquad = get_nquad(n_symbols_pdcch,frame_parms,mi);
  uint32_t RCC = (Mquad>>5), ND;
  uint32_t row,col,Kpi,index;
  int32_t i,k,a;
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#ifdef RM_DEBUG
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  int32_t nulled=0;
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#endif
  //  msg("[PHY] PDCCH Interleaving Mquad %d (Nsymb %d)\n",Mquad,n_symbols_pdcch);
  if ((Mquad&0x1f) > 0)
    RCC++;
  Kpi = (RCC<<5);
  ND = Kpi - Mquad;

  k=0;
  for (col=0;col<32;col++) {
    index = bitrev_cc_dci[col];

    for (row=0;row<RCC;row++) {
      //msg("col %d, index %d, row %d\n",col,index,row);
      if (index>=ND) {
	for (a=0;a<frame_parms->nb_antennas_tx_eNB;a++){
	  //msg("a %d k %d\n",a,k);

	  wptr = &wtemp[a][k<<2];
	  zptr = &z[a][(index-ND)<<2];

	  //msg("wptr=%p, zptr=%p\n",wptr,zptr);

	  wptr[0] = zptr[0];
	  wptr[1] = zptr[1];
	  wptr[2] = zptr[2];
	  wptr[3] = zptr[3];
	}
	k++;
      }
      index+=32;
    }
  }

  // permutation
  for (i=0;i<Mquad;i++) {

    for (a=0;a<frame_parms->nb_antennas_tx_eNB;a++) {
      
      //wptr  = &wtemp[a][i<<2];
      //wptr2 = &wbar[a][((i+frame_parms->Nid_cell)%Mquad)<<2];
      wptr = &wtemp[a][((i+frame_parms->Nid_cell)%Mquad)<<2];
      wptr2 = &wbar[a][i<<2];
      wptr2[0] = wptr[0];
      wptr2[1] = wptr[1];
      wptr2[2] = wptr[2];
      wptr2[3] = wptr[3];
    }
  }
}

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void pdcch_demapping(uint16_t *llr,uint16_t *wbar,LTE_DL_FRAME_PARMS *frame_parms,uint8_t num_pdcch_symbols,uint8_t mi) {
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  uint32_t i, lprime;
  uint16_t kprime,kprime_mod12,mprime,symbol_offset,tti_offset,tti_offset0;
  int16_t re_offset,re_offset0;
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  // This is the REG allocation algorithm from 36-211, second part of Section 6.8.5

  int Msymb2;

  switch (frame_parms->N_RB_DL) {
  case 100:
    Msymb2 = Msymb;
    break;
  case 75:
    Msymb2 = 3*Msymb/4;
    break;
  case 50:
    Msymb2 = Msymb>>1;
    break;
  case 25:
    Msymb2 = Msymb>>2;
    break;
  case 15:
    Msymb2 = Msymb*15/100;
    break;
  case 6:
    Msymb2 = Msymb*6/100;
    break;
  default:
    Msymb2 = Msymb>>2;
    break;
  }
  mprime=0;


  re_offset = 0;
  re_offset0 = 0; // counter for symbol with pilots (extracted outside!)
  
  for (kprime=0;kprime<frame_parms->N_RB_DL*12;kprime++) {
    for (lprime=0;lprime<num_pdcch_symbols;lprime++) {

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      symbol_offset = (uint32_t)frame_parms->N_RB_DL*12*lprime;
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      tti_offset = symbol_offset + re_offset;
      tti_offset0 = symbol_offset + re_offset0;
      // if REG is allocated to PHICH, skip it
      if (check_phich_reg(frame_parms,kprime,lprime,mi) == 1) {
	//msg("dci_demapping : skipping REG %d\n",(lprime==0)?kprime/6 : kprime>>2);
	if ((lprime == 0)&&((kprime%6)==0))
	  re_offset0+=4;
      }
      else {  // not allocated to PHICH/PCFICH
	//	msg("dci_demapping: REG %d\n",(lprime==0)?kprime/6 : kprime>>2);
	if (lprime == 0) {
	  // first symbol, or second symbol+4 TX antennas skip pilots
	  kprime_mod12 = kprime%12;
	  if ((kprime_mod12 == 0) || (kprime_mod12 == 6)) {
	    // kprime represents REG	    

	    for (i=0;i<4;i++) {
	      wbar[mprime] = llr[tti_offset0+i];
#ifdef DEBUG_DCI_DECODING
	      msg("[PHY] PDCCH demapping mprime %d => %d (symbol %d re %d) -> (%d,%d)\n",mprime,tti_offset0,symbol_offset,re_offset0,*(char*)&wbar[mprime],*(1+(char*)&wbar[mprime]));
#endif
	      mprime++;
	      re_offset0++;
	    }
	  }
	}
	else if ((lprime==1)&&(frame_parms->nb_antennas_tx_eNB == 4)) {  
	  // LATER!!!!
	}
	else { // no pilots in this symbol
	  kprime_mod12 = kprime%12;
	  if ((kprime_mod12 == 0) || (kprime_mod12 == 4) || (kprime_mod12 == 8)) {
	    // kprime represents REG	    
	    for (i=0;i<4;i++) {
	      wbar[mprime] = llr[tti_offset+i];
#ifdef DEBUG_DCI_DECODING
	      msg("[PHY] PDCCH demapping mprime %d => %d (symbol %d re %d) -> (%d,%d)\n",mprime,tti_offset,symbol_offset,re_offset+i,*(char*)&wbar[mprime],*(1+(char*)&wbar[mprime]));
#endif
		mprime++;
	    }
	  }  // is representative
	} // no pilots case	
      } // not allocated to PHICH/PCFICH

      // Stop when all REGs are copied in
      if (mprime>=Msymb2)
	break;
    } //lprime loop
    re_offset++;

  } // kprime loop
}

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static uint16_t wtemp_rx[Msymb];
void pdcch_deinterleaving(LTE_DL_FRAME_PARMS *frame_parms,uint16_t *z, uint16_t *wbar,uint8_t number_pdcch_symbols,uint8_t mi) {
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  uint16_t *wptr,*zptr,*wptr2;
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  uint16_t Mquad=get_nquad(number_pdcch_symbols,frame_parms,mi);
  uint32_t RCC = (Mquad>>5), ND;
  uint32_t row,col,Kpi,index;
  int32_t i,k;
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  //  printf("Mquad %d, RCC %d\n",Mquad,RCC);

  if (!z) {
    msg("dci.c: pdcch_deinterleaving: FATAL z is Null\n");
    return;
  }
  // undo permutation
  for (i=0;i<Mquad;i++) {
    //wptr = &wtemp_rx[i<<2];
    //wptr2 = &wbar[((i+frame_parms->Nid_cell)%Mquad)<<2];
    wptr = &wtemp_rx[((i+frame_parms->Nid_cell)%Mquad)<<2];
    wptr2 = &wbar[i<<2];

    wptr[0] = wptr2[0];
    wptr[1] = wptr2[1];
    wptr[2] = wptr2[2];
    wptr[3] = wptr2[3];
    /*
    msg("pdcch_deinterleaving (%p,%p): quad %d -> (%d,%d %d,%d %d,%d %d,%d)\n",wptr,wptr2,i,
	((char*)wptr2)[0],
	((char*)wptr2)[1],
	((char*)wptr2)[2],
	((char*)wptr2)[3],
	((char*)wptr2)[4],
	((char*)wptr2)[5],
	((char*)wptr2)[6],
	((char*)wptr2)[7]);
    */	

  }

  if ((Mquad&0x1f) > 0)
    RCC++;
  Kpi = (RCC<<5);
  ND = Kpi - Mquad;

  k=0;
  for (col=0;col<32;col++) {
    index = bitrev_cc_dci[col];

    for (row=0;row<RCC;row++) {
      //      printf("row %d, index %d, Nd %d\n",row,index,ND);
      if (index>=ND) {



	wptr = &wtemp_rx[k<<2];
	zptr = &z[(index-ND)<<2];
	
	zptr[0] = wptr[0];
	zptr[1] = wptr[1];
	zptr[2] = wptr[2];
	zptr[3] = wptr[3];

	/*
	printf("deinterleaving ; k %d, index-Nd %d  => (%d,%d,%d,%d,%d,%d,%d,%d)\n",k,(index-ND),
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	       ((int8_t *)wptr)[0],
	       ((int8_t *)wptr)[1],
	       ((int8_t *)wptr)[2],
	       ((int8_t *)wptr)[3],
	       ((int8_t *)wptr)[4],
	       ((int8_t *)wptr)[5],
	       ((int8_t *)wptr)[6],
	       ((int8_t *)wptr)[7]);
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	*/
	k++;
      }
      index+=32;
            
    }
  }

  for (i=0;i<Mquad;i++) {
    zptr = &z[i<<2];
    /*
    printf("deinterleaving ; quad %d  => (%d,%d,%d,%d,%d,%d,%d,%d)\n",i,
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	   ((int8_t *)zptr)[0],
	   ((int8_t *)zptr)[1],
	   ((int8_t *)zptr)[2],
	   ((int8_t *)zptr)[3],
	   ((int8_t *)zptr)[4],
	   ((int8_t *)zptr)[5],
	   ((int8_t *)zptr)[6],
	   ((int8_t *)zptr)[7]);
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    */
  }
  
}


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int32_t pdcch_qpsk_qpsk_llr(LTE_DL_FRAME_PARMS *frame_parms,
			 int32_t **rxdataF_comp,
			 int32_t **rxdataF_comp_i,
			 int32_t **rho_i,
			 int16_t *pdcch_llr16,
			 int16_t *pdcch_llr8in,
			 uint8_t symbol) {
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  __m128i *rxF=(__m128i*)&rxdataF_comp[0][(symbol*frame_parms->N_RB_DL*12)];
  __m128i *rxF_i=(__m128i*)&rxdataF_comp_i[0][(symbol*frame_parms->N_RB_DL*12)];
  __m128i *rho=(__m128i*)&rho_i[0][(symbol*frame_parms->N_RB_DL*12)];
  __m128i *llr128;
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  int32_t i;
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  char *pdcch_llr8;
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  int16_t *pdcch_llr;
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  pdcch_llr8 = (char *)&pdcch_llr8in[symbol*frame_parms->N_RB_DL*12];
  pdcch_llr = &pdcch_llr16[symbol*frame_parms->N_RB_DL*12];

  //  printf("dlsch_qpsk_qpsk: symbol %d\n",symbol);
  
  llr128 = (__m128i*)pdcch_llr;

  if (!llr128) {
    msg("dlsch_qpsk_qpsk_llr: llr is null, symbol %d\n",symbol);
    return -1;
  }

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  qpsk_qpsk((int16_t *)rxF,
	    (int16_t *)rxF_i,
	    (int16_t *)llr128,
	    (int16_t *)rho,
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	    frame_parms->N_RB_DL*12);

  //prepare for Viterbi which accepts 8 bit, but prefers 4 bit, soft input.
  for (i=0;i<(frame_parms->N_RB_DL*24);i++) {
    if (*pdcch_llr>7)
      *pdcch_llr8=7;
    else if (*pdcch_llr<-8)
      *pdcch_llr8=-8;
    else
      *pdcch_llr8 = (char)(*pdcch_llr);

    pdcch_llr++;
    pdcch_llr8++;
  }

  return(0);
}


588 589
int32_t pdcch_llr(LTE_DL_FRAME_PARMS *frame_parms,
		   int32_t **rxdataF_comp,
590
		   char *pdcch_llr,
591
		   uint8_t symbol) {
592

593 594
  int16_t *rxF= (int16_t*) &rxdataF_comp[0][(symbol*frame_parms->N_RB_DL*12)];
  int32_t i;
595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625
  char *pdcch_llr8;

  pdcch_llr8 = &pdcch_llr[2*symbol*frame_parms->N_RB_DL*12];
 
  if (!pdcch_llr8) {
    msg("pdcch_qpsk_llr: llr is null, symbol %d\n",symbol);
    return(-1);
  }
  //    msg("pdcch qpsk llr for symbol %d (pos %d), llr offset %d\n",symbol,(symbol*frame_parms->N_RB_DL*12),pdcch_llr8-pdcch_llr);

  for (i=0;i<(frame_parms->N_RB_DL*((symbol==0) ? 16 : 24));i++) {

    if (*rxF>31)
      *pdcch_llr8=31;
    else if (*rxF<-32)
      *pdcch_llr8=-32;
    else
      *pdcch_llr8 = (char)(*rxF);

    //    printf("%d %d => %d\n",i,*rxF,*pdcch_llr8);
    rxF++;
    pdcch_llr8++;
  }

  return(0);

}

__m128i avg128P;

//compute average channel_level on each (TX,RX) antenna pair
626
void pdcch_channel_level(int32_t **dl_ch_estimates_ext,
627
			 LTE_DL_FRAME_PARMS *frame_parms,
628 629
			 int32_t *avg,
			 uint8_t nb_rb) {
630

631 632
  int16_t rb;
  uint8_t aatx,aarx;
633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657
  __m128i *dl_ch128;
  

  for (aatx=0;aatx<frame_parms->nb_antennas_tx_eNB;aatx++)
    for (aarx=0;aarx<frame_parms->nb_antennas_rx;aarx++) {
      //clear average level
      avg128P = _mm_xor_si128(avg128P,avg128P);
      dl_ch128=(__m128i *)&dl_ch_estimates_ext[(aatx<<1)+aarx][frame_parms->N_RB_DL*12];

      for (rb=0;rb<nb_rb;rb++) {
    
	avg128P = _mm_add_epi32(avg128P,_mm_madd_epi16(dl_ch128[0],dl_ch128[0]));
	avg128P = _mm_add_epi32(avg128P,_mm_madd_epi16(dl_ch128[1],dl_ch128[1]));
	avg128P = _mm_add_epi32(avg128P,_mm_madd_epi16(dl_ch128[2],dl_ch128[2]));

	dl_ch128+=3;	
	/*
	  if (rb==0) {
	  print_shorts("dl_ch128",&dl_ch128[0]);
	  print_shorts("dl_ch128",&dl_ch128[1]);
	  print_shorts("dl_ch128",&dl_ch128[2]);
	  }
	*/
      }

658 659 660 661
      avg[(aatx<<1)+aarx] = (((int32_t*)&avg128P)[0] + 
			     ((int32_t*)&avg128P)[1] + 
			     ((int32_t*)&avg128P)[2] + 
			     ((int32_t*)&avg128P)[3])/(nb_rb*12);
662 663 664 665 666 667 668 669 670 671 672

      //            msg("Channel level : %d\n",avg[(aatx<<1)+aarx]);
    }
  _mm_empty();
  _m_empty();

}

__m128i mmtmpPD0,mmtmpPD1,mmtmpPD2,mmtmpPD3;

void pdcch_dual_stream_correlation(LTE_DL_FRAME_PARMS *frame_parms,
673 674 675 676 677
				   uint8_t symbol,
				   int32_t **dl_ch_estimates_ext,
				   int32_t **dl_ch_estimates_ext_i,
				   int32_t **dl_ch_rho_ext,
				   uint8_t output_shift) {
678

679
  uint16_t rb;
680
  __m128i *dl_ch128,*dl_ch128i,*dl_ch_rho128;
681
  uint8_t aarx;
682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770

  //  printf("dlsch_dual_stream_correlation: symbol %d\n",symbol);


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

    dl_ch128          = (__m128i *)&dl_ch_estimates_ext[aarx][symbol*frame_parms->N_RB_DL*12];
    dl_ch128i         = (__m128i *)&dl_ch_estimates_ext_i[aarx][symbol*frame_parms->N_RB_DL*12];
    dl_ch_rho128      = (__m128i *)&dl_ch_rho_ext[aarx][symbol*frame_parms->N_RB_DL*12];


    for (rb=0;rb<frame_parms->N_RB_DL;rb++) {
      // multiply by conjugated channel
      mmtmpPD0 = _mm_madd_epi16(dl_ch128[0],dl_ch128i[0]);
      //	print_ints("re",&mmtmpPD0);
      
      // mmtmpD0 contains real part of 4 consecutive outputs (32-bit)
      mmtmpPD1 = _mm_shufflelo_epi16(dl_ch128[0],_MM_SHUFFLE(2,3,0,1));
      mmtmpPD1 = _mm_shufflehi_epi16(mmtmpPD1,_MM_SHUFFLE(2,3,0,1));
      mmtmpPD1 = _mm_sign_epi16(mmtmpPD1,*(__m128i*)&conjugate[0]);
      //	print_ints("im",&mmtmpPD1);
      mmtmpPD1 = _mm_madd_epi16(mmtmpPD1,dl_ch128i[0]);
      // mmtmpD1 contains imag part of 4 consecutive outputs (32-bit)
      mmtmpPD0 = _mm_srai_epi32(mmtmpPD0,output_shift);
      //	print_ints("re(shift)",&mmtmpPD0);
      mmtmpPD1 = _mm_srai_epi32(mmtmpPD1,output_shift);
      //	print_ints("im(shift)",&mmtmpPD1);
      mmtmpPD2 = _mm_unpacklo_epi32(mmtmpPD0,mmtmpPD1);
      mmtmpPD3 = _mm_unpackhi_epi32(mmtmpPD0,mmtmpPD1);
      //       	print_ints("c0",&mmtmpPD2);
      //	print_ints("c1",&mmtmpPD3);
      dl_ch_rho128[0] = _mm_packs_epi32(mmtmpPD2,mmtmpPD3);
      
      //print_shorts("rx:",dl_ch128_2);
      //print_shorts("ch:",dl_ch128);
      //print_shorts("pack:",rho128);
      
      // multiply by conjugated channel
      mmtmpPD0 = _mm_madd_epi16(dl_ch128[1],dl_ch128i[1]);
      // mmtmpPD0 contains real part of 4 consecutive outputs (32-bit)
      mmtmpPD1 = _mm_shufflelo_epi16(dl_ch128[1],_MM_SHUFFLE(2,3,0,1));
      mmtmpPD1 = _mm_shufflehi_epi16(mmtmpPD1,_MM_SHUFFLE(2,3,0,1));
      mmtmpPD1 = _mm_sign_epi16(mmtmpPD1,*(__m128i*)conjugate);
      mmtmpPD1 = _mm_madd_epi16(mmtmpPD1,dl_ch128i[1]);
      // mmtmpPD1 contains imag part of 4 consecutive outputs (32-bit)
      mmtmpPD0 = _mm_srai_epi32(mmtmpPD0,output_shift);
      mmtmpPD1 = _mm_srai_epi32(mmtmpPD1,output_shift);
      mmtmpPD2 = _mm_unpacklo_epi32(mmtmpPD0,mmtmpPD1);
      mmtmpPD3 = _mm_unpackhi_epi32(mmtmpPD0,mmtmpPD1);
      
      
      dl_ch_rho128[1] =_mm_packs_epi32(mmtmpPD2,mmtmpPD3);
      //print_shorts("rx:",dl_ch128_2+1);
      //print_shorts("ch:",dl_ch128+1);
      //print_shorts("pack:",rho128+1);	
      // multiply by conjugated channel
      mmtmpPD0 = _mm_madd_epi16(dl_ch128[2],dl_ch128i[2]);
      // mmtmpPD0 contains real part of 4 consecutive outputs (32-bit)
      mmtmpPD1 = _mm_shufflelo_epi16(dl_ch128[2],_MM_SHUFFLE(2,3,0,1));
      mmtmpPD1 = _mm_shufflehi_epi16(mmtmpPD1,_MM_SHUFFLE(2,3,0,1));
      mmtmpPD1 = _mm_sign_epi16(mmtmpPD1,*(__m128i*)conjugate);
      mmtmpPD1 = _mm_madd_epi16(mmtmpPD1,dl_ch128i[2]);
      // mmtmpPD1 contains imag part of 4 consecutive outputs (32-bit)
      mmtmpPD0 = _mm_srai_epi32(mmtmpPD0,output_shift);
      mmtmpPD1 = _mm_srai_epi32(mmtmpPD1,output_shift);
      mmtmpPD2 = _mm_unpacklo_epi32(mmtmpPD0,mmtmpPD1);
      mmtmpPD3 = _mm_unpackhi_epi32(mmtmpPD0,mmtmpPD1);
      
      dl_ch_rho128[2] = _mm_packs_epi32(mmtmpPD2,mmtmpPD3);
      //print_shorts("rx:",dl_ch128_2+2);
      //print_shorts("ch:",dl_ch128+2);
      //print_shorts("pack:",rho128+2);
      
      dl_ch128+=3;
      dl_ch128i+=3;
      dl_ch_rho128+=3;
      
    }	
    
  }
  
  _mm_empty();
  _m_empty();
  
  
}


void pdcch_detection_mrc_i(LTE_DL_FRAME_PARMS *frame_parms,
771 772 773 774 775
			 int32_t **rxdataF_comp,
			 int32_t **rxdataF_comp_i,
			 int32_t **rho,
			 int32_t **rho_i,
			 uint8_t symbol) {
776

777
  uint8_t aatx;
778 779

  __m128i *rxdataF_comp128_0,*rxdataF_comp128_1,*rxdataF_comp128_i0,*rxdataF_comp128_i1,*rho128_0,*rho128_1,*rho128_i0,*rho128_i1;
780
  int32_t i;
781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814

  if (frame_parms->nb_antennas_rx>1) {
    for (aatx=0;aatx<frame_parms->nb_antennas_tx_eNB;aatx++) {
      //if (frame_parms->mode1_flag && (aatx>0)) break;

      rxdataF_comp128_0   = (__m128i *)&rxdataF_comp[(aatx<<1)][symbol*frame_parms->N_RB_DL*12];  
      rxdataF_comp128_1   = (__m128i *)&rxdataF_comp[(aatx<<1)+1][symbol*frame_parms->N_RB_DL*12];

      // MRC on each re of rb on MF output
      for (i=0;i<frame_parms->N_RB_DL*3;i++) {
	rxdataF_comp128_0[i] = _mm_adds_epi16(_mm_srai_epi16(rxdataF_comp128_0[i],1),_mm_srai_epi16(rxdataF_comp128_1[i],1));
      }
    }
    rho128_0 = (__m128i *) &rho[0][symbol*frame_parms->N_RB_DL*12];
    rho128_1 = (__m128i *) &rho[1][symbol*frame_parms->N_RB_DL*12];
    for (i=0;i<frame_parms->N_RB_DL*3;i++) {
      rho128_0[i] = _mm_adds_epi16(_mm_srai_epi16(rho128_0[i],1),_mm_srai_epi16(rho128_1[i],1));
    }
    rho128_i0 = (__m128i *) &rho_i[0][symbol*frame_parms->N_RB_DL*12];
    rho128_i1 = (__m128i *) &rho_i[1][symbol*frame_parms->N_RB_DL*12];
    rxdataF_comp128_i0   = (__m128i *)&rxdataF_comp_i[0][symbol*frame_parms->N_RB_DL*12];  
    rxdataF_comp128_i1   = (__m128i *)&rxdataF_comp_i[1][symbol*frame_parms->N_RB_DL*12];
      // MRC on each re of rb on MF and rho
    for (i=0;i<frame_parms->N_RB_DL*3;i++) {
      rxdataF_comp128_i0[i] = _mm_adds_epi16(_mm_srai_epi16(rxdataF_comp128_i0[i],1),_mm_srai_epi16(rxdataF_comp128_i1[i],1));
      rho128_i0[i]          = _mm_adds_epi16(_mm_srai_epi16(rho128_i0[i],1),_mm_srai_epi16(rho128_i1[i],1));
    }
  }
  _mm_empty();
  _m_empty();

}


815 816 817 818 819
void pdcch_extract_rbs_single(int32_t **rxdataF,
			      int32_t **dl_ch_estimates,
			      int32_t **rxdataF_ext,
			      int32_t **dl_ch_estimates_ext,
			      uint8_t symbol,
820
			      uint32_t high_speed_flag,
821 822 823
			      LTE_DL_FRAME_PARMS *frame_parms) {


824 825 826
  uint16_t rb,nb_rb=0;
  uint8_t i,j,aarx;
  int32_t *dl_ch0,*dl_ch0_ext,*rxF,*rxF_ext;
827 828 829
  

  int nushiftmod3 = frame_parms->nushift%3;
830
  uint8_t symbol_mod;
831 832 833 834 835 836

  symbol_mod = (symbol>=(7-frame_parms->Ncp)) ? symbol-(7-frame_parms->Ncp) : symbol;
#ifdef DEBUG_DCI_DECODING
  msg("[PHY] extract_rbs_single: symbol_mod %d\n",symbol_mod);
#endif
  for (aarx=0;aarx<frame_parms->nb_antennas_rx;aarx++) {
837 838 839 840 841

    if (high_speed_flag == 1)
      dl_ch0     = &dl_ch_estimates[aarx][5+(symbol*(frame_parms->ofdm_symbol_size))];
    else
      dl_ch0     = &dl_ch_estimates[aarx][5];
842 843 844 845 846
    dl_ch0_ext = &dl_ch_estimates_ext[aarx][symbol*(frame_parms->N_RB_DL*12)];

    rxF_ext   = &rxdataF_ext[aarx][symbol*(frame_parms->N_RB_DL*12)];

    rxF       = &rxdataF[aarx][(frame_parms->first_carrier_offset + (symbol*(frame_parms->ofdm_symbol_size)))];
847

848 849 850 851 852 853
    if ((frame_parms->N_RB_DL&1) == 0)  { // even number of RBs
      for (rb=0;rb<frame_parms->N_RB_DL;rb++) {
	
	// For second half of RBs skip DC carrier
	if (rb==(frame_parms->N_RB_DL>>1)) {
	  rxF       = &rxdataF[aarx][(1 + (symbol*(frame_parms->ofdm_symbol_size)))];
854

855 856 857 858
	  //dl_ch0++; 
	}
	
	if (symbol_mod>0) {
859
	  memcpy(dl_ch0_ext,dl_ch0,12*sizeof(int32_t));
860
	  for (i=0;i<12;i++) {
861

862
	    rxF_ext[i]=rxF[i];
863

864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897
	  }
	  nb_rb++;
	  dl_ch0_ext+=12;
	  rxF_ext+=12;
	  
	  dl_ch0+=12;
	  rxF+=12;
	}
	else {
	  j=0;
	  for (i=0;i<12;i++) {
	    if ((i!=nushiftmod3) &&
		(i!=(nushiftmod3+3)) &&
		(i!=(nushiftmod3+6)) &&
		(i!=(nushiftmod3+9))) {
	      rxF_ext[j]=rxF[i];
	      //	      	      	      printf("extract rb %d, re %d => (%d,%d)\n",rb,i,*(short *)&rxF_ext[j],*(1+(short*)&rxF_ext[j]));
	      dl_ch0_ext[j++]=dl_ch0[i];
	      //	      	      printf("ch %d => (%d,%d)\n",i,*(short *)&dl_ch0[i],*(1+(short*)&dl_ch0[i]));
	    }
	  }
	  nb_rb++;
	  dl_ch0_ext+=8;
	  rxF_ext+=8;
	  
	  dl_ch0+=12;
	  rxF+=12;
	}
      }
    }
    else {  // Odd number of RBs
      for (rb=0;rb<frame_parms->N_RB_DL>>1;rb++) {

	if (symbol_mod>0) {
898
	  memcpy(dl_ch0_ext,dl_ch0,12*sizeof(int32_t));
899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981
	  for (i=0;i<12;i++)
	    rxF_ext[i]=rxF[i];
	  nb_rb++;
	  dl_ch0_ext+=12;
	  rxF_ext+=12;
	  
	  dl_ch0+=12;
	  rxF+=12;
	}
	else {
	  j=0;
	  for (i=0;i<12;i++) {
	    if ((i!=nushiftmod3) &&
		(i!=(nushiftmod3+3)) &&
		(i!=(nushiftmod3+6)) &&
		(i!=(nushiftmod3+9))) {
	      rxF_ext[j]=rxF[i];
	      //	      	      	      printf("extract rb %d, re %d => (%d,%d)\n",rb,i,*(short *)&rxF_ext[j],*(1+(short*)&rxF_ext[j]));
	      dl_ch0_ext[j++]=dl_ch0[i];
	      //	      	      printf("ch %d => (%d,%d)\n",i,*(short *)&dl_ch0[i],*(1+(short*)&dl_ch0[i]));
	    }
	  }
	  nb_rb++;
	  dl_ch0_ext+=8;
	  rxF_ext+=8;
	  
	  dl_ch0+=12;
	  rxF+=12;
	}
      }
      // Do middle RB (around DC)
      //	msg("dlch_ext %d\n",dl_ch0_ext-&dl_ch_estimates_ext[aarx][0]);      

      if (symbol_mod==0) {
	j=0;
	for (i=0;i<6;i++) {
	  if ((i!=nushiftmod3) &&
	      (i!=(nushiftmod3+3))){
	    dl_ch0_ext[j]=dl_ch0[i];
	    rxF_ext[j++]=rxF[i];
	    //	    	      printf("**extract rb %d, re %d => (%d,%d)\n",rb,i,*(short *)&rxF_ext[j-1],*(1+(short*)&rxF_ext[j-1]));
	  }
	}
	rxF       = &rxdataF[aarx][((symbol*(frame_parms->ofdm_symbol_size)))];
	for (;i<12;i++) {
	  if ((i!=(nushiftmod3+6)) &&
	      (i!=(nushiftmod3+9))){
	    dl_ch0_ext[j]=dl_ch0[i];
	    rxF_ext[j++]=rxF[(1+i-6)];
	    //	    	      printf("**extract rb %d, re %d => (%d,%d)\n",rb,i,*(short *)&rxF_ext[j-1],*(1+(short*)&rxF_ext[j-1]));
	  }
	}
      
	
	nb_rb++;
	dl_ch0_ext+=8;
	rxF_ext+=8;
	dl_ch0+=12;
	rxF+=7;
	rb++;
      }
      else {
	for (i=0;i<6;i++) {
	  dl_ch0_ext[i]=dl_ch0[i];
	  rxF_ext[i]=rxF[i];
	}
	rxF       = &rxdataF[aarx][((symbol*(frame_parms->ofdm_symbol_size)))];
	for (;i<12;i++) {
	  dl_ch0_ext[i]=dl_ch0[i];
	  rxF_ext[i]=rxF[(1+i-6)];
	}
      
	
	nb_rb++;
	dl_ch0_ext+=12;
	rxF_ext+=12;
	dl_ch0+=12;
	rxF+=7;
	rb++;
      }

      for (;rb<frame_parms->N_RB_DL;rb++) {
	if (symbol_mod > 0) {
982
	  memcpy(dl_ch0_ext,dl_ch0,12*sizeof(int32_t));
983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019
	  for (i=0;i<12;i++)
	    rxF_ext[i]=rxF[i];
	  nb_rb++;
	  dl_ch0_ext+=12;
	  rxF_ext+=12;
	  
	  dl_ch0+=12;
	  rxF+=12;
	}
	else {
	  j=0;
	  for (i=0;i<12;i++) {
	    if ((i!=(nushiftmod3)) &&
		(i!=(nushiftmod3+3)) &&
		(i!=(nushiftmod3+6)) &&
		(i!=(nushiftmod3+9))) {
	      rxF_ext[j]=rxF[i];
	      //	      	      printf("extract rb %d, re %d => (%d,%d)\n",rb,i,*(short *)&rxF_ext[j],*(1+(short*)&rxF_ext[j]));
	      dl_ch0_ext[j++]=dl_ch0[i];
	    }
	  }
	  nb_rb++;
	  dl_ch0_ext+=8;
	  rxF_ext+=8;
	  
	  dl_ch0+=12;
	  rxF+=12;
	}
      }
    }
  }

  _mm_empty();
  _m_empty();

}

1020 1021 1022 1023 1024
void pdcch_extract_rbs_dual(int32_t **rxdataF,
			    int32_t **dl_ch_estimates,
			    int32_t **rxdataF_ext,
			    int32_t **dl_ch_estimates_ext,
			    uint8_t symbol,
1025
			    uint32_t high_speed_flag,
1026 1027 1028
			    LTE_DL_FRAME_PARMS *frame_parms) {
  

1029 1030 1031 1032
  uint16_t rb,nb_rb=0;
  uint8_t i,aarx,j;
  int32_t *dl_ch0,*dl_ch0_ext,*dl_ch1,*dl_ch1_ext,*rxF,*rxF_ext;
  uint8_t symbol_mod;
1033 1034 1035 1036 1037
  int nushiftmod3 = frame_parms->nushift%3;

  symbol_mod = (symbol>=(7-frame_parms->Ncp)) ? symbol-(7-frame_parms->Ncp) : symbol;

  for (aarx=0;aarx<frame_parms->nb_antennas_rx;aarx++) {
1038 1039 1040 1041 1042 1043 1044 1045 1046

    if (high_speed_flag==1) {
      dl_ch0     = &dl_ch_estimates[aarx][5+(symbol*(frame_parms->ofdm_symbol_size))];
      dl_ch1     = &dl_ch_estimates[2+aarx][5+(symbol*(frame_parms->ofdm_symbol_size))];
    }
    else {
      dl_ch0     = &dl_ch_estimates[aarx][5];
      dl_ch1     = &dl_ch_estimates[2+aarx][5];
    }
1047 1048 1049 1050 1051 1052 1053
    dl_ch0_ext = &dl_ch_estimates_ext[aarx][symbol*(frame_parms->N_RB_DL*12)];
    dl_ch1_ext = &dl_ch_estimates_ext[2+aarx][symbol*(frame_parms->N_RB_DL*12)];

    //    msg("pdcch extract_rbs: rxF_ext pos %d\n",symbol*(frame_parms->N_RB_DL*12));
    rxF_ext   = &rxdataF_ext[aarx][symbol*(frame_parms->N_RB_DL*12)];

    rxF       = &rxdataF[aarx][(frame_parms->first_carrier_offset + (symbol*(frame_parms->ofdm_symbol_size)))];
1054

1055 1056 1057 1058 1059 1060
    if ((frame_parms->N_RB_DL&1) == 0)  // even number of RBs
      for (rb=0;rb<frame_parms->N_RB_DL;rb++) {
	
	// For second half of RBs skip DC carrier
	if (rb==(frame_parms->N_RB_DL>>1)) {
	  rxF       = &rxdataF[aarx][(1 + (symbol*(frame_parms->ofdm_symbol_size)))];
1061
	  //	  dl_ch0++;
1062 1063 1064 1065
	  //dl_ch1++;
	}
	
	if (symbol_mod>0) {
1066 1067
	  memcpy(dl_ch0_ext,dl_ch0,12*sizeof(int32_t));
	  memcpy(dl_ch1_ext,dl_ch1,12*sizeof(int32_t));
1068
	  /*	  
1069 1070
	    msg("rb %d\n",rb);
	    for (i=0;i<12;i++)
1071 1072 1073
	    msg("(%d %d)",((int16_t *)dl_ch0)[i<<1],((int16_t*)dl_ch0)[1+(i<<1)]);
	    msg("\n");
	  */
1074 1075
	  for (i=0;i<12;i++) {
	    rxF_ext[i]=rxF[i];
1076 1077
	    //	    msg("%d : (%d,%d)\n",(rxF+(2*i)-&rxdataF[aarx][( (symbol*(frame_parms->ofdm_symbol_size)))*2])/2,
	    //	((int16_t*)&rxF[i<<1])[0],((int16_t*)&rxF[i<<1])[0]);
1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091
	  }
	  nb_rb++;
	  dl_ch0_ext+=12;
	  dl_ch1_ext+=12;
	  rxF_ext+=12;
	}
	else {
	  j=0;
	  for (i=0;i<12;i++) {
	    if ((i!=nushiftmod3) &&
		(i!=nushiftmod3+3) &&
		(i!=nushiftmod3+6) &&
		(i!=nushiftmod3+9)) {
	      rxF_ext[j]=rxF[i];
1092 1093
	      //     	      	      	      printf("extract rb %d, re %d => (%d,%d)\n",rb,i,*(short *)&rxF_ext[j],*(1+(short*)&rxF_ext[j]));
	      dl_ch0_ext[j]  =dl_ch0[i];
1094 1095 1096 1097 1098
	      dl_ch1_ext[j++]=dl_ch1[i];
	    }
	  }
	  nb_rb++;
	  dl_ch0_ext+=8;
1099
	  dl_ch1_ext+=8;
1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112
	  rxF_ext+=8;
	}
	dl_ch0+=12;
	dl_ch1+=12;
	rxF+=12;
      }
  
    else {  // Odd number of RBs
      for (rb=0;rb<frame_parms->N_RB_DL>>1;rb++) {

	//	msg("rb %d: %d\n",rb,rxF-&rxdataF[aarx][(symbol*(frame_parms->ofdm_symbol_size))*2]);

	if (symbol_mod>0) {
1113 1114
	  memcpy(dl_ch0_ext,dl_ch0,12*sizeof(int32_t));
	  memcpy(dl_ch1_ext,dl_ch1,12*sizeof(int32_t));
1115 1116
	  for (i=0;i<12;i++)
	    rxF_ext[i]=rxF[i];
1117

1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214
	  nb_rb++;
	  dl_ch0_ext+=12;
	  dl_ch1_ext+=12;
	  rxF_ext+=12;
	  
	  dl_ch0+=12;
	  dl_ch1+=12;
	  rxF+=12;
	  
	}
	else {
	  j=0;
	  for (i=0;i<12;i++) {
	    if ((i!=nushiftmod3) &&
		(i!=nushiftmod3+3) &&
		(i!=nushiftmod3+6) &&
		(i!=nushiftmod3+9)) {
	      rxF_ext[j]=rxF[i];
	      //	      	      	      printf("extract rb %d, re %d => (%d,%d)\n",rb,i,*(short *)&rxF_ext[j],*(1+(short*)&rxF_ext[j]));
	      dl_ch0_ext[j]=dl_ch0[i];
	      dl_ch1_ext[j++]=dl_ch1[i];
	      //	      	      printf("ch %d => (%d,%d)\n",i,*(short *)&dl_ch0[i],*(1+(short*)&dl_ch0[i]));
	    }
	  }
	  nb_rb++;
	  dl_ch0_ext+=8;
	  dl_ch1_ext+=8;
	  rxF_ext+=8;
	  

	  dl_ch0+=12;
	  dl_ch1+=12;
	  rxF+=12;
	}
      }      
	// Do middle RB (around DC)

      if (symbol_mod > 0) {
	for (i=0;i<6;i++) {
	  dl_ch0_ext[i]=dl_ch0[i];
	  dl_ch1_ext[i]=dl_ch1[i];
	  rxF_ext[i]=rxF[i];
	}
	rxF       = &rxdataF[aarx][((symbol*(frame_parms->ofdm_symbol_size)))];
	for (;i<12;i++) {
	  dl_ch0_ext[i]=dl_ch0[i];
	  dl_ch1_ext[i]=dl_ch1[i];
	  rxF_ext[i]=rxF[(1+i)];
	}

	nb_rb++;
	dl_ch0_ext+=12;
	dl_ch1_ext+=12;
	rxF_ext+=12;
	
	dl_ch0+=12;
	dl_ch1+=12;
	rxF+=7;
	rb++;
      }
      else {
	j=0;
	for (i=0;i<6;i++) {
	  if ((i!=nushiftmod3) &&
	      (i!=nushiftmod3+3)){
	    dl_ch0_ext[j]=dl_ch0[i];
	    dl_ch1_ext[j]=dl_ch1[i];
	    rxF_ext[j++]=rxF[i];
	    //	    	      printf("**extract rb %d, re %d => (%d,%d)\n",rb,i,*(short *)&rxF_ext[j-1],*(1+(short*)&rxF_ext[j-1]));
	  }
	}
	rxF       = &rxdataF[aarx][((symbol*(frame_parms->ofdm_symbol_size)))];
	for (;i<12;i++) {
	  if ((i!=nushiftmod3+6) &&
	      (i!=nushiftmod3+9)){
	    dl_ch0_ext[j]=dl_ch0[i];
	    dl_ch1_ext[j]=dl_ch1[i];
	    rxF_ext[j++]=rxF[(1+i-6)];
	    //	    	      printf("**extract rb %d, re %d => (%d,%d)\n",rb,i,*(short *)&rxF_ext[j-1],*(1+(short*)&rxF_ext[j-1]));
	  }
	}
      
	
	nb_rb++;
	dl_ch0_ext+=8;
	dl_ch1_ext+=8;
	rxF_ext+=8;
	dl_ch0+=12;
	dl_ch1+=12;
	rxF+=7;
	rb++;
      }

      for (;rb<frame_parms->N_RB_DL;rb++) {

	if (symbol_mod>0) {
	  //	msg("rb %d: %d\n",rb,rxF-&rxdataF[aarx][(symbol*(frame_parms->ofdm_symbol_size))*2]);
1215 1216
	  memcpy(dl_ch0_ext,dl_ch0,12*sizeof(int32_t));
	  memcpy(dl_ch1_ext,dl_ch1,12*sizeof(int32_t));
1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259
	  for (i=0;i<12;i++)
	    rxF_ext[i]=rxF[i];
	  nb_rb++;
	  dl_ch0_ext+=12;
	  dl_ch1_ext+=12;
	  rxF_ext+=12;
	  
	  dl_ch0+=12;
	  dl_ch1+=12;
	  rxF+=12;
	}
	else {
	  j=0;
	  for (i=0;i<12;i++) {
	    if ((i!=nushiftmod3) &&
		(i!=nushiftmod3+3) &&
		(i!=nushiftmod3+6) &&
		(i!=nushiftmod3+9)) {
	      rxF_ext[j]=rxF[i];
	      //	      	      printf("extract rb %d, re %d => (%d,%d)\n",rb,i,*(short *)&rxF_ext[j],*(1+(short*)&rxF_ext[j]));
	      dl_ch0_ext[j]=dl_ch0[i];
	      dl_ch1_ext[j++]=dl_ch1[i];
	    }
	  }
	  nb_rb++;
	  dl_ch0_ext+=8;
	  dl_ch1_ext+=8;
	  rxF_ext+=8;
	  
	  dl_ch0+=12;
	  dl_ch1+=12;
	  rxF+=12;
	}
      }
    }
  }
  _mm_empty();
  _m_empty();
  

}


1260 1261 1262 1263
void pdcch_channel_compensation(int32_t **rxdataF_ext,
				int32_t **dl_ch_estimates_ext,
				int32_t **rxdataF_comp,
				int32_t **rho,
1264
				LTE_DL_FRAME_PARMS *frame_parms,
1265 1266
				uint8_t symbol,
				uint8_t output_shift) {
1267

1268
  uint16_t rb;
1269 1270
  __m128i *dl_ch128,*rxdataF128,*rxdataF_comp128;
  __m128i *dl_ch128_2, *rho128;
1271
  uint8_t aatx,aarx,pilots=0;
1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457



#ifndef __SSE3__
  zero2 = _mm_xor_si128(zero2,zero2);
#endif

#ifdef DEBUG_DCI_DECODING
  msg("[PHY] PDCCH comp: symbol %d\n",symbol);
#endif

  if (symbol==0)
    pilots=1;

  for (aatx=0;aatx<frame_parms->nb_antennas_tx_eNB;aatx++) {
    //if (frame_parms->mode1_flag && aatx>0) break; //if mode1_flag is set then there is only one stream to extract, independent of nb_antennas_tx_eNB

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

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


      for (rb=0;rb<frame_parms->N_RB_DL;rb++) {
	
	// multiply by conjugated channel
	mmtmpPD0 = _mm_madd_epi16(dl_ch128[0],rxdataF128[0]);
	//	print_ints("re",&mmtmpPD0);
	
	// mmtmpPD0 contains real part of 4 consecutive outputs (32-bit)
	mmtmpPD1 = _mm_shufflelo_epi16(dl_ch128[0],_MM_SHUFFLE(2,3,0,1));
	mmtmpPD1 = _mm_shufflehi_epi16(mmtmpPD1,_MM_SHUFFLE(2,3,0,1));
	mmtmpPD1 = _mm_sign_epi16(mmtmpPD1,*(__m128i*)&conjugate[0]);
	//	print_ints("im",&mmtmpPD1);
	mmtmpPD1 = _mm_madd_epi16(mmtmpPD1,rxdataF128[0]);
	// mmtmpPD1 contains imag part of 4 consecutive outputs (32-bit)
	mmtmpPD0 = _mm_srai_epi32(mmtmpPD0,output_shift);
	//	print_ints("re(shift)",&mmtmpPD0);
	mmtmpPD1 = _mm_srai_epi32(mmtmpPD1,output_shift);
	//	print_ints("im(shift)",&mmtmpPD1);
	mmtmpPD2 = _mm_unpacklo_epi32(mmtmpPD0,mmtmpPD1);
	mmtmpPD3 = _mm_unpackhi_epi32(mmtmpPD0,mmtmpPD1);
	//       	print_ints("c0",&mmtmpPD2);
	//	print_ints("c1",&mmtmpPD3);
	rxdataF_comp128[0] = _mm_packs_epi32(mmtmpPD2,mmtmpPD3);
	//	print_shorts("rx:",rxdataF128);
	//	print_shorts("ch:",dl_ch128);
	//	print_shorts("pack:",rxdataF_comp128);

	// multiply by conjugated channel
	mmtmpPD0 = _mm_madd_epi16(dl_ch128[1],rxdataF128[1]);
	// mmtmpPD0 contains real part of 4 consecutive outputs (32-bit)
	mmtmpPD1 = _mm_shufflelo_epi16(dl_ch128[1],_MM_SHUFFLE(2,3,0,1));
	mmtmpPD1 = _mm_shufflehi_epi16(mmtmpPD1,_MM_SHUFFLE(2,3,0,1));
	mmtmpPD1 = _mm_sign_epi16(mmtmpPD1,*(__m128i*)conjugate);
	mmtmpPD1 = _mm_madd_epi16(mmtmpPD1,rxdataF128[1]);
	// mmtmpPD1 contains imag part of 4 consecutive outputs (32-bit)
	mmtmpPD0 = _mm_srai_epi32(mmtmpPD0,output_shift);
	mmtmpPD1 = _mm_srai_epi32(mmtmpPD1,output_shift);
	mmtmpPD2 = _mm_unpacklo_epi32(mmtmpPD0,mmtmpPD1);
	mmtmpPD3 = _mm_unpackhi_epi32(mmtmpPD0,mmtmpPD1);
	
	rxdataF_comp128[1] = _mm_packs_epi32(mmtmpPD2,mmtmpPD3);
	//	print_shorts("rx:",rxdataF128+1);
	//	print_shorts("ch:",dl_ch128+1);
	//	print_shorts("pack:",rxdataF_comp128+1);	
	// multiply by conjugated channel
	if (pilots == 0) {
	  mmtmpPD0 = _mm_madd_epi16(dl_ch128[2],rxdataF128[2]);
	  // mmtmpPD0 contains real part of 4 consecutive outputs (32-bit)
	  mmtmpPD1 = _mm_shufflelo_epi16(dl_ch128[2],_MM_SHUFFLE(2,3,0,1));
	  mmtmpPD1 = _mm_shufflehi_epi16(mmtmpPD1,_MM_SHUFFLE(2,3,0,1));
	  mmtmpPD1 = _mm_sign_epi16(mmtmpPD1,*(__m128i*)conjugate);
	  mmtmpPD1 = _mm_madd_epi16(mmtmpPD1,rxdataF128[2]);
	  // mmtmpPD1 contains imag part of 4 consecutive outputs (32-bit)
	  mmtmpPD0 = _mm_srai_epi32(mmtmpPD0,output_shift);
	  mmtmpPD1 = _mm_srai_epi32(mmtmpPD1,output_shift);
	  mmtmpPD2 = _mm_unpacklo_epi32(mmtmpPD0,mmtmpPD1);
	  mmtmpPD3 = _mm_unpackhi_epi32(mmtmpPD0,mmtmpPD1);
	  
	  rxdataF_comp128[2] = _mm_packs_epi32(mmtmpPD2,mmtmpPD3);
	}
	//	print_shorts("rx:",rxdataF128+2);
	//	print_shorts("ch:",dl_ch128+2);
	//      	print_shorts("pack:",rxdataF_comp128+2);
      
	if (pilots==0) {
	  dl_ch128+=3;
	  rxdataF128+=3;
	  rxdataF_comp128+=3;
	}
	else {
	  dl_ch128+=2;
	  rxdataF128+=2;
	  rxdataF_comp128+=2;
	}
      }
    }
  }
  

  if (rho) {

    for (aarx=0;aarx<frame_parms->nb_antennas_rx;aarx++) {
      rho128        = (__m128i *)&rho[aarx][symbol*frame_parms->N_RB_DL*12];
      dl_ch128      = (__m128i *)&dl_ch_estimates_ext[aarx][symbol*frame_parms->N_RB_DL*12];
      dl_ch128_2    = (__m128i *)&dl_ch_estimates_ext[2+aarx][symbol*frame_parms->N_RB_DL*12];

      for (rb=0;rb<frame_parms->N_RB_DL;rb++) {
	// multiply by conjugated channel
	mmtmpPD0 = _mm_madd_epi16(dl_ch128[0],dl_ch128_2[0]);
	//	print_ints("re",&mmtmpD0);
	
	// mmtmpD0 contains real part of 4 consecutive outputs (32-bit)
	mmtmpPD1 = _mm_shufflelo_epi16(dl_ch128[0],_MM_SHUFFLE(2,3,0,1));
	mmtmpPD1 = _mm_shufflehi_epi16(mmtmpPD1,_MM_SHUFFLE(2,3,0,1));
	mmtmpPD1 = _mm_sign_epi16(mmtmpPD1,*(__m128i*)&conjugate[0]);
	//	print_ints("im",&mmtmpPD1);
	mmtmpPD1 = _mm_madd_epi16(mmtmpPD1,dl_ch128_2[0]);
	// mmtmpPD1 contains imag part of 4 consecutive outputs (32-bit)
	mmtmpPD0 = _mm_srai_epi32(mmtmpPD0,output_shift);
	//	print_ints("re(shift)",&mmtmpD0);
	mmtmpPD1 = _mm_srai_epi32(mmtmpPD1,output_shift);
	//	print_ints("im(shift)",&mmtmpD1);
	mmtmpPD2 = _mm_unpacklo_epi32(mmtmpPD0,mmtmpPD1);
	mmtmpPD3 = _mm_unpackhi_epi32(mmtmpPD0,mmtmpPD1);
	//       	print_ints("c0",&mmtmpPD2);
	//	print_ints("c1",&mmtmpPD3);
	rho128[0] = _mm_packs_epi32(mmtmpPD2,mmtmpPD3);

	//print_shorts("rx:",dl_ch128_2);
	//print_shorts("ch:",dl_ch128);
	//print_shorts("pack:",rho128);
	
	// multiply by conjugated channel
	mmtmpPD0 = _mm_madd_epi16(dl_ch128[1],dl_ch128_2[1]);
	// mmtmpD0 contains real part of 4 consecutive outputs (32-bit)
	mmtmpPD1 = _mm_shufflelo_epi16(dl_ch128[1],_MM_SHUFFLE(2,3,0,1));
	mmtmpPD1 = _mm_shufflehi_epi16(mmtmpPD1,_MM_SHUFFLE(2,3,0,1));
	mmtmpPD1 = _mm_sign_epi16(mmtmpPD1,*(__m128i*)conjugate);
	mmtmpPD1 = _mm_madd_epi16(mmtmpPD1,dl_ch128_2[1]);
	// mmtmpD1 contains imag part of 4 consecutive outputs (32-bit)
	mmtmpPD0 = _mm_srai_epi32(mmtmpPD0,output_shift);
	mmtmpPD1 = _mm_srai_epi32(mmtmpPD1,output_shift);
	mmtmpPD2 = _mm_unpacklo_epi32(mmtmpPD0,mmtmpPD1);
	mmtmpPD3 = _mm_unpackhi_epi32(mmtmpPD0,mmtmpPD1);


	rho128[1] =_mm_packs_epi32(mmtmpPD2,mmtmpPD3);
	//print_shorts("rx:",dl_ch128_2+1);
	//print_shorts("ch:",dl_ch128+1);
	//print_shorts("pack:",rho128+1);	
	// multiply by conjugated channel
	mmtmpPD0 = _mm_madd_epi16(dl_ch128[2],dl_ch128_2[2]);
	// mmtmpPD0 contains real part of 4 consecutive outputs (32-bit)
	mmtmpPD1 = _mm_shufflelo_epi16(dl_ch128[2],_MM_SHUFFLE(2,3,0,1));
	mmtmpPD1 = _mm_shufflehi_epi16(mmtmpPD1,_MM_SHUFFLE(2,3,0,1));
	mmtmpPD1 = _mm_sign_epi16(mmtmpPD1,*(__m128i*)conjugate);
	mmtmpPD1 = _mm_madd_epi16(mmtmpPD1,dl_ch128_2[2]);
	// mmtmpPD1 contains imag part of 4 consecutive outputs (32-bit)
	mmtmpPD0 = _mm_srai_epi32(mmtmpPD0,output_shift);
	mmtmpPD1 = _mm_srai_epi32(mmtmpPD1,output_shift);
	mmtmpPD2 = _mm_unpacklo_epi32(mmtmpPD0,mmtmpPD1);
	mmtmpPD3 = _mm_unpackhi_epi32(mmtmpPD0,mmtmpPD1);
	
	rho128[2] = _mm_packs_epi32(mmtmpPD2,mmtmpPD3);
	//print_shorts("rx:",dl_ch128_2+2);
	//print_shorts("ch:",dl_ch128+2);
	//print_shorts("pack:",rho128+2);
	
	dl_ch128+=3;
	dl_ch128_2+=3;
	rho128+=3;
	
      }	
    }

  }

  _mm_empty();
  _m_empty();

}     

void pdcch_detection_mrc(LTE_DL_FRAME_PARMS *frame_parms,
1458 1459
			 int32_t **rxdataF_comp,
			 uint8_t symbol) {
1460

1461
  uint8_t aatx;
1462 1463

  __m128i *rxdataF_comp128_0,*rxdataF_comp128_1;
1464
  int32_t i;
1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481

  if (frame_parms->nb_antennas_rx>1) {
    for (aatx=0;aatx<frame_parms->nb_antennas_tx_eNB;aatx++) {
      rxdataF_comp128_0   = (__m128i *)&rxdataF_comp[(aatx<<1)][symbol*frame_parms->N_RB_DL*12];  
      rxdataF_comp128_1   = (__m128i *)&rxdataF_comp[(aatx<<1)+1][symbol*frame_parms->N_RB_DL*12];  
      // MRC on each re of rb
      for (i=0;i<frame_parms->N_RB_DL*3;i++) {
	rxdataF_comp128_0[i] = _mm_adds_epi16(_mm_srai_epi16(rxdataF_comp128_0[i],1),_mm_srai_epi16(rxdataF_comp128_1[i],1));
      }
    }
  }
  _mm_empty();
  _m_empty();

}

void pdcch_siso(LTE_DL_FRAME_PARMS *frame_parms,
1482 1483
		int32_t **rxdataF_comp,
		uint8_t l) {
1484 1485


1486
  uint8_t rb,re,jj,ii;
1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501

  jj=0;
  ii=0;
  for (rb=0;rb<frame_parms->N_RB_DL;rb++) {

    for (re=0;re<12;re++) {
      
      rxdataF_comp[0][jj++] = rxdataF_comp[0][ii];
      ii++;
    }
  }
}


void pdcch_alamouti(LTE_DL_FRAME_PARMS *frame_parms,
1502 1503
		    int32_t **rxdataF_comp,
		    uint8_t symbol){
1504 1505


1506 1507 1508
  int16_t *rxF0,*rxF1;
  uint8_t rb,re;
  int32_t jj=(symbol*frame_parms->N_RB_DL*12);
1509

1510 1511
  rxF0     = (int16_t*)&rxdataF_comp[0][jj];  //tx antenna 0  h0*y
  rxF1     = (int16_t*)&rxdataF_comp[2][jj];  //tx antenna 1  h1*y
1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534

  for (rb=0;rb<frame_parms->N_RB_DL;rb++) {

    for (re=0;re<12;re+=2) {

      // Alamouti RX combining
      
      rxF0[0] = rxF0[0] + rxF1[2];
      rxF0[1] = rxF0[1] - rxF1[3];

      rxF0[2] = rxF0[2] - rxF1[0];
      rxF0[3] = rxF0[3] + rxF1[1];
 
      rxF0+=4;
      rxF1+=4;
    }
  }

  _mm_empty();
  _m_empty();
  
}

1535
int32_t avgP[4];
1536

1537
int32_t rx_pdcch(LTE_UE_COMMON *lte_ue_common_vars,
1538 1539 1540 1541 1542
		 LTE_UE_PDCCH **lte_ue_pdcch_vars,
		 LTE_DL_FRAME_PARMS *frame_parms,
		 uint8_t subframe,
		 uint8_t eNB_id,
		 MIMO_mode_t mimo_mode,
1543
		 uint32_t high_speed_flag,
1544
		 uint8_t is_secondary_ue) {
1545

1546
  uint8_t log2_maxh,aatx,aarx;
1547
#ifdef MU_RECEIVER
1548
  uint8_t eNB_id_i=eNB_id+1;//add 1 to eNB_id to separate from wanted signal, chosen as the B/F'd pilots from the SeNB are shifted by 1
1549
#endif
1550 1551 1552
  int32_t avgs,s;
  uint8_t n_pdcch_symbols = 3; //lte_ue_pdcch_vars[eNB_id]->num_pdcch_symbols;
  uint8_t mi = get_mi(frame_parms,subframe);
1553 1554 1555 1556 1557 1558 1559 1560 1561 1562

  //  printf("In rx_pdcch, subframe %d,  eNB_id %d\n",subframe,eNB_id);

  for (s=0;s<n_pdcch_symbols;s++) {
      if (is_secondary_ue == 1) {
	pdcch_extract_rbs_single(lte_ue_common_vars->rxdataF,
				 lte_ue_common_vars->dl_ch_estimates[eNB_id+1], //add 1 to eNB_id to compensate for the shifted B/F'd pilots from the SeNB
				 lte_ue_pdcch_vars[eNB_id]->rxdataF_ext,
				 lte_ue_pdcch_vars[eNB_id]->dl_ch_estimates_ext,
				 s,
1563
				 high_speed_flag,
1564 1565 1566 1567 1568 1569 1570
				 frame_parms);
#ifdef MU_RECEIVER
	pdcch_extract_rbs_single(lte_ue_common_vars->rxdataF,
				 lte_ue_common_vars->dl_ch_estimates[eNB_id_i - 1],//subtract 1 to eNB_id_i to compensate for the non-shifted pilots from the PeNB
				 lte_ue_pdcch_vars[eNB_id_i]->rxdataF_ext,//shift by two to simulate transmission from a second antenna
				 lte_ue_pdcch_vars[eNB_id_i]->dl_ch_estimates_ext,//shift by two to simulate transmission from a second antenna
				 s,
1571
				 high_speed_flag,
1572 1573 1574 1575 1576 1577 1578 1579
				 frame_parms);
#endif //MU_RECEIVER
      } else if (frame_parms->nb_antennas_tx_eNB>1) {
	pdcch_extract_rbs_dual(lte_ue_common_vars->rxdataF,
			       lte_ue_common_vars->dl_ch_estimates[eNB_id],
			       lte_ue_pdcch_vars[eNB_id]->rxdataF_ext,
			       lte_ue_pdcch_vars[eNB_id]->dl_ch_estimates_ext,
			       s,
1580
			       high_speed_flag,
1581 1582 1583 1584 1585 1586 1587
			       frame_parms);
      } else {
	pdcch_extract_rbs_single(lte_ue_common_vars->rxdataF,
				 lte_ue_common_vars->dl_ch_estimates[eNB_id],
				 lte_ue_pdcch_vars[eNB_id]->rxdataF_ext,
				 lte_ue_pdcch_vars[eNB_id]->dl_ch_estimates_ext,
				 s,
1588
				 high_speed_flag,
1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601
				 frame_parms);
      }
  }
  pdcch_channel_level(lte_ue_pdcch_vars[eNB_id]->dl_ch_estimates_ext,
		      frame_parms,
		      avgP,
		      frame_parms->N_RB_DL);

  avgs = 0;
  for (aatx=0;aatx<frame_parms->nb_antennas_tx_eNB;aatx++)
    for (aarx=0;aarx<frame_parms->nb_antennas_rx;aarx++)
      avgs = cmax(avgs,avgP[(aarx<<1)+aatx]);
  
1602
  log2_maxh = (log2_approx(avgs)/2) + 2 + frame_parms->nb_antennas_rx - 1;
1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618
#ifdef DEBUG_PHY
  msg("[PDCCH] log2_maxh = %d (%d,%d)\n",log2_maxh,avgP[0],avgs);
#endif


  for (s=0;s<n_pdcch_symbols;s++) {
    pdcch_channel_compensation(lte_ue_pdcch_vars[eNB_id]->rxdataF_ext,
			       lte_ue_pdcch_vars[eNB_id]->dl_ch_estimates_ext,
			       lte_ue_pdcch_vars[eNB_id]->rxdataF_comp,
			       (aatx>1) ? lte_ue_pdcch_vars[eNB_id]->rho : NULL,
			       frame_parms,
			       s,
			       log2_maxh); // log2_maxh+I0_shift


#ifdef DEBUG_PHY
1619 1620
    if (subframe==5)
      write_output("rxF_comp_d.m","rxF_c_d",&lte_ue_pdcch_vars[eNB_id]->rxdataF_comp[0][s*frame_parms->N_RB_DL*12],frame_parms->N_RB_DL*12,1,1);
1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681
#endif

#ifdef MU_RECEIVER
    if (is_secondary_ue) {
      //get MF output for interfering stream
      pdcch_channel_compensation(lte_ue_pdcch_vars[eNB_id_i]->rxdataF_ext,
				 lte_ue_pdcch_vars[eNB_id_i]->dl_ch_estimates_ext,
				 lte_ue_pdcch_vars[eNB_id_i]->rxdataF_comp,
				 (aatx>1) ? lte_ue_pdcch_vars[eNB_id_i]->rho : NULL,
				 frame_parms,
				 s,
				 log2_maxh); // log2_maxh+I0_shift
#ifdef DEBUG_PHY
	write_output("rxF_comp_i.m","rxF_c_i",&lte_ue_pdcch_vars[eNB_id_i]->rxdataF_comp[0][s*frame_parms->N_RB_DL*12],frame_parms->N_RB_DL*12,1,1);
#endif
      pdcch_dual_stream_correlation(frame_parms,
				    s,
				    lte_ue_pdcch_vars[eNB_id]->dl_ch_estimates_ext,
				    lte_ue_pdcch_vars[eNB_id_i]->dl_ch_estimates_ext,
				    lte_ue_pdcch_vars[eNB_id]->dl_ch_rho_ext,
				    log2_maxh);
    }
#endif //MU_RECEIVER
    

    if (frame_parms->nb_antennas_rx > 1) {
#ifdef MU_RECEIVER
      if (is_secondary_ue) {
	pdcch_detection_mrc_i(frame_parms,
			      lte_ue_pdcch_vars[eNB_id]->rxdataF_comp,
			      lte_ue_pdcch_vars[eNB_id_i]->rxdataF_comp,
			      lte_ue_pdcch_vars[eNB_id]->rho,
			      lte_ue_pdcch_vars[eNB_id]->dl_ch_rho_ext,
			      s);
#ifdef DEBUG_PHY
	write_output("rxF_comp_d.m","rxF_c_d",&lte_ue_pdcch_vars[eNB_id]->rxdataF_comp[0][s*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_pdcch_vars[eNB_id_i]->rxdataF_comp[0][s*frame_parms->N_RB_DL*12],frame_parms->N_RB_DL*12,1,1);
#endif
      } else 
#endif //MU_RECEIVER
	pdcch_detection_mrc(frame_parms,
			    lte_ue_pdcch_vars[eNB_id]->rxdataF_comp,
			    s);
      
    }
  
    if (mimo_mode == SISO) 
      pdcch_siso(frame_parms,lte_ue_pdcch_vars[eNB_id]->rxdataF_comp,s);
    else
      pdcch_alamouti(frame_parms,lte_ue_pdcch_vars[eNB_id]->rxdataF_comp,s);

    
#ifdef MU_RECEIVER
    if (is_secondary_ue) {
      pdcch_qpsk_qpsk_llr(frame_parms,
			  lte_ue_pdcch_vars[eNB_id]->rxdataF_comp,
			  lte_ue_pdcch_vars[eNB_id_i]->rxdataF_comp,
			  lte_ue_pdcch_vars[eNB_id]->dl_ch_rho_ext,
			  lte_ue_pdcch_vars[eNB_id]->llr16, //subsequent function require 16 bit llr, but output must be 8 bit (actually clipped to 4, because of the Viterbi decoder)
			  lte_ue_pdcch_vars[eNB_id]->llr,
			  s);
1682
      /*
1683
#ifdef DEBUG_PHY
1684
      if (subframe==5) {
1685 1686
	write_output("llr8_seq.m","llr8",&lte_ue_pdcch_vars[eNB_id]->llr[s*frame_parms->N_RB_DL*12],frame_parms->N_RB_DL*12,1,4);
	write_output("llr16_seq.m","llr16",&lte_ue_pdcch_vars[eNB_id]->llr16[s*frame_parms->N_RB_DL*12],frame_parms->N_RB_DL*12,1,4);
1687
      }
1688
      #endif*/
1689 1690 1691 1692 1693 1694 1695
    } 
    else {
#endif //MU_RECEIVER
      pdcch_llr(frame_parms,
		lte_ue_pdcch_vars[eNB_id]->rxdataF_comp,
		(char *)lte_ue_pdcch_vars[eNB_id]->llr,
		s);
1696
      /*#ifdef DEBUG_PHY
1697
      write_output("llr8_seq.m","llr8",&lte_ue_pdcch_vars[eNB_id]->llr[s*frame_parms->N_RB_DL*12],frame_parms->N_RB_DL*12,1,4);
1698
      #endif*/
1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725
#ifdef MU_RECEIVER
    }
#endif //MU_RECEIVER

  }

  // decode pcfich here
  n_pdcch_symbols = rx_pcfich(frame_parms,
			      subframe,
			      lte_ue_pdcch_vars[eNB_id],
			      mimo_mode);
  if (n_pdcch_symbols>3)
    n_pdcch_symbols=1;

#ifdef DEBUG_DCI_DECODING
  msg("[PDCCH] subframe %d n_pdcch_symbols from PCFICH =%d\n",subframe,n_pdcch_symbols);

  msg("demapping: subframe %d, mi %d, tdd_config %d\n",subframe,get_mi(frame_parms,subframe),frame_parms->tdd_config);
#endif

  pdcch_demapping(lte_ue_pdcch_vars[eNB_id]->llr,
		  lte_ue_pdcch_vars[eNB_id]->wbar,
		  frame_parms,
		  n_pdcch_symbols,
		  get_mi(frame_parms,subframe));

  pdcch_deinterleaving(frame_parms,
1726
		       (uint16_t*)lte_ue_pdcch_vars[eNB_id]->e_rx,
1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742
		       lte_ue_pdcch_vars[eNB_id]->wbar,
		       n_pdcch_symbols,
		       mi);
  
  pdcch_unscrambling(frame_parms,
		     subframe,
		     lte_ue_pdcch_vars[eNB_id]->e_rx,
		     get_nCCE(n_pdcch_symbols,frame_parms,mi)*72);
  
  lte_ue_pdcch_vars[eNB_id]->num_pdcch_symbols = n_pdcch_symbols;

  return(0);
}


void pdcch_scrambling(LTE_DL_FRAME_PARMS *frame_parms,
1743 1744 1745
		      uint8_t subframe,
		      uint8_t *e,
		      uint32_t length) {
1746
  int i;
1747 1748
  uint8_t reset;
  uint32_t x1, x2, s=0;
1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767

  reset = 1;
  // x1 is set in lte_gold_generic

  x2 = (subframe<<9) + frame_parms->Nid_cell; //this is c_init in 36.211 Sec 6.8.2

  for (i=0; i<length; i++) {
    if ((i&0x1f)==0) {
      s = lte_gold_generic(&x1, &x2, reset);
      //printf("lte_gold[%d]=%x\n",i,s);
      reset = 0;
    }
    //    printf("scrambling %d : e %d, c %d\n",i,e[i],((s>>(i&0x1f))&1));
    if (e[i] != 2) // <NIL> element is 2
      e[i] = (e[i]&1) ^ ((s>>(i&0x1f))&1);
  }
}

void pdcch_unscrambling(LTE_DL_FRAME_PARMS *frame_parms,
1768 1769 1770
			uint8_t subframe,
			int8_t* llr,
			uint32_t length) {
1771 1772

  int i;
1773 1774
  uint8_t reset;
  uint32_t x1, x2, s=0;
1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795

  reset = 1;
  // x1 is set in first call to lte_gold_generic

  x2 = (subframe<<9) + frame_parms->Nid_cell; //this is c_init in 36.211 Sec 6.8.2

  for (i=0; i<length; i++) {
    if (i%32==0) {
      s = lte_gold_generic(&x1, &x2, reset);
      //printf("lte_gold[%d]=%x\n",i,s);
      reset = 0;
    }
    // take the quarter of the PBCH that corresponds to this frame
    //    printf("unscrambling %d : e %d, c %d\n",i,llr[i],((s>>(i&0x1f))&1));
    if (((s>>(i%32))&1)==0)
      llr[i] = -llr[i];

  }
}
	     

1796
uint8_t get_num_pdcch_symbols(uint8_t num_dci,
1797 1798
			 DCI_ALLOC_t *dci_alloc,
			 LTE_DL_FRAME_PARMS *frame_parms,
1799
			 uint8_t subframe) {
1800

1801 1802 1803
  uint16_t numCCE = 0;
  uint8_t i;
  uint8_t nCCEmin = 0;
1804 1805 1806

  // check pdcch duration imposed by PHICH duration (Section 6.9 of 36-211)
  if (frame_parms->Ncp==1) { // extended prefix
1807
    if ((frame_parms->frame_type == TDD) && 
1808 1809 1810 1811 1812 1813 1814 1815 1816 1817
	((frame_parms->tdd_config<3)||(frame_parms->tdd_config==6)) &&
	((subframe==1) || (subframe==6))) // subframes 1 and 6 (S-subframes) for 5ms switching periodicity are 2 symbols
      nCCEmin = 2;
    else {   // 10ms switching periodicity is always 3 symbols, any DL-only subframe is 3 symbols
      nCCEmin = 3;
    }
  }

  // compute numCCE
  for (i=0;i<num_dci;i++) {
1818
    //     printf("dci %d => %d\n",i,dci_alloc[i].L);
1819 1820 1821 1822 1823 1824 1825
    numCCE += (1<<(dci_alloc[i].L));
  }

  //if ((9*numCCE) <= (frame_parms->N_RB_DL*2))
  if (numCCE <= get_nCCE(1, frame_parms, get_mi(frame_parms, subframe)))
    return(cmax(1,nCCEmin));
  //else if ((9*numCCE) <= (frame_parms->N_RB_DL*((frame_parms->nb_antennas_tx_eNB==4) ? 4 : 5)))
1826
  else if (numCCE <= get_nCCE(2, frame_parms, get_mi(frame_parms, subframe)))
1827 1828
    return(cmax(2,nCCEmin));
  //else if ((9*numCCE) <= (frame_parms->N_RB_DL*((frame_parms->nb_antennas_tx_eNB==4) ? 7 : 8)))
1829
  else if (numCCE <= get_nCCE(3, frame_parms, get_mi(frame_parms, subframe)))
1830 1831 1832
    return(cmax(3,nCCEmin));
  else if (frame_parms->N_RB_DL<=10) { 
    if (frame_parms->Ncp == 0) { // normal CP
1833 1834 1835 1836
      printf("numCCE %d, N_RB_DL = %d : should be returning 4 PDCCH symbols (%d,%d,%d)\n",numCCE,frame_parms->N_RB_DL,
	     get_nCCE(1, frame_parms, get_mi(frame_parms, subframe)),
	     get_nCCE(2, frame_parms, get_mi(frame_parms, subframe)),
	     get_nCCE(3, frame_parms, get_mi(frame_parms, subframe)));
1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854
      if ((9*numCCE) <= (frame_parms->N_RB_DL*((frame_parms->nb_antennas_tx_eNB==4) ? 10 : 11)))
	return(4);
    }
    else { // extended CP
      if ((9*numCCE) <= (frame_parms->N_RB_DL*((frame_parms->nb_antennas_tx_eNB==4) ? 9 : 10)))
	return(4);
    }
  }

  
  msg("[PHY] dci.c: get_num_pdcch_symbols subframe %d FATAL, illegal numCCE %d (num_dci %d)\n",subframe,numCCE,num_dci);
  //for (i=0;i<num_dci;i++) {
  //  printf("dci_alloc[%d].L = %d\n",i,dci_alloc[i].L);
  //}  
  //exit(-1);
  return(0);
}

1855
uint8_t generate_dci_top(uint8_t num_ue_spec_dci,
1856 1857 1858 1859 1860 1861 1862
			 uint8_t num_common_dci,
			 DCI_ALLOC_t *dci_alloc, 
			 uint32_t n_rnti,
			 int16_t amp,
			 LTE_DL_FRAME_PARMS *frame_parms,
			 mod_sym_t **txdataF,
			 uint32_t subframe) {
1863 1864 1865 1866 1867 1868 1869 1870

  uint8_t *e_ptr,num_pdcch_symbols;
  int8_t L;
  uint32_t i, lprime;
  uint32_t gain_lin_QPSK,kprime,kprime_mod12,mprime,nsymb,symbol_offset,tti_offset;
  int16_t re_offset;
  uint8_t mi = get_mi(frame_parms,subframe);
  static uint8_t e[DCI_BITS_MAX];	
1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919
  static mod_sym_t yseq0[Msymb],yseq1[Msymb],wbar0[Msymb],wbar1[Msymb];
     
  mod_sym_t *y[2];
  mod_sym_t *wbar[2];
  
  int nushiftmod3 = frame_parms->nushift%3;

  int Msymb2;
  int split_flag=0;

  switch (frame_parms->N_RB_DL) {
  case 100:
    Msymb2 = Msymb;
    break;
  case 75:
    Msymb2 = 3*Msymb/4;
    break;
  case 50:
    Msymb2 = Msymb>>1;
    break;
  case 25:
    Msymb2 = Msymb>>2;
    break;
  case 15:
    Msymb2 = Msymb*15/100;
    break;
  case 6:
    Msymb2 = Msymb*6/100;
    break;
  default:
    Msymb2 = Msymb>>2;
    break;
  }

  num_pdcch_symbols = get_num_pdcch_symbols(num_ue_spec_dci+num_common_dci,dci_alloc,frame_parms,subframe);
  //   printf("subframe %d in generate_dci_top num_pdcch_symbols = %d, num_dci %d\n",
  //    	 subframe,num_pdcch_symbols,num_ue_spec_dci+num_common_dci);
  generate_pcfich(num_pdcch_symbols,
		  amp,
		  frame_parms,
		  txdataF,
		  subframe);

  wbar[0] = &wbar0[0];
  wbar[1] = &wbar1[0];
  y[0] = &yseq0[0];
  y[1] = &yseq1[0];

  // reset all bits to <NIL>, here we set <NIL> elements as 2
1920
  //memset(e, 2, DCI_BITS_MAX);
1921
  // here we interpred NIL as a random QPSK sequence. That makes power estimation easier.
1922 1923
  for (i=0;i<DCI_BITS_MAX;i++) 
    e[i]=taus()&1;
1924 1925 1926 1927 1928 1929 1930
  e_ptr = e;

  // generate DCIs in order of decreasing aggregation level, then common/ue spec
  // MAC is assumed to have ordered the UE spec DCI according to the RNTI-based randomization
  for (L=3;L>=0;L--) {
    for (i=0;i<num_common_dci;i++) {

1931
      if (dci_alloc[i].L == (uint8_t)L) {
1932 1933
	
#ifdef DEBUG_DCI_ENCODING
1934
	LOG_I(PHY,"Generating common DCI %d/%d (nCCE %d) of length %d, aggregation %d (%x)\n",i,num_common_dci,dci_alloc[i].nCCE,dci_alloc[i].dci_length,1<<dci_alloc[i].L,*(unsigned int*)dci_alloc[i].dci_pdu);
1935 1936
	dump_dci(frame_parms,&dci_alloc[i]);
#endif
1937 1938 1939 1940 1941 1942 1943
	if (dci_alloc[i].nCCE>=0) {
	  e_ptr = generate_dci0(dci_alloc[i].dci_pdu,
				e+(72*dci_alloc[i].nCCE),
				dci_alloc[i].dci_length,
				dci_alloc[i].L,
				dci_alloc[i].rnti);    
	}
1944 1945 1946 1947
      }
    }
    for (;i<num_ue_spec_dci + num_common_dci;i++) {

1948
      if (dci_alloc[i].L == (uint8_t)L) {
1949 1950
      
#ifdef DEBUG_DCI_ENCODING
1951
	LOG_I(PHY," Generating UE (rnti %x) specific DCI %d of length %d, aggregation %d, format %d (%x)\n",dci_alloc[i].rnti,i,dci_alloc[i].dci_length,1<<dci_alloc[i].L,dci_alloc[i].format,dci_alloc[i].dci_pdu);
1952 1953
	dump_dci(frame_parms,&dci_alloc[i]);
#endif
1954 1955 1956 1957 1958 1959 1960
	if (dci_alloc[i].nCCE >= 0) {
	  e_ptr = generate_dci0(dci_alloc[i].dci_pdu,
				e+(72*dci_alloc[i].nCCE),
				dci_alloc[i].dci_length,
				dci_alloc[i].L,
				dci_alloc[i].rnti);        
	}
1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974
      }
    }
  }

  // Scrambling
  //  printf("pdcch scrambling\n");
  pdcch_scrambling(frame_parms,
		   subframe,
		   e,
                   8*get_nquad(num_pdcch_symbols, frame_parms, mi));
		   //72*get_nCCE(num_pdcch_symbols,frame_parms,mi));
  

#ifdef DEBUG_DCI_ENCODING