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/*
 * Licensed to the OpenAirInterface (OAI) Software Alliance under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The OpenAirInterface Software Alliance licenses this file to You under
 * the OAI Public License, Version 1.0  (the "License"); you may not use this file
 * except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.openairinterface.org/?page_id=698
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *-------------------------------------------------------------------------------
 * For more information about the OpenAirInterface (OAI) Software Alliance:
 *      contact@openairinterface.org
 */

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/*! \file PHY/LTE_TRANSPORT/phich.c
* \brief Top-level routines for generating and decoding  the PHICH/HI physical/transport channel V8.6 2009-03
* \author R. Knopp
* \date 2011
* \version 0.1
* \company Eurecom
* \email: knopp@eurecom.fr
* \note
* \warning
*/

#include "PHY/defs.h"
#include "PHY/extern.h"
#include "SCHED/defs.h"
#include "defs.h"
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#include "LAYER2/MAC/extern.h"
#include "LAYER2/MAC/defs.h"

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#ifndef USER_MODE
#include "ARCH/CBMIMO1/DEVICE_DRIVER/extern.h"
#endif

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#include "T.h"

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//#define DEBUG_PHICH 1

//extern unsigned short pcfich_reg[4];
//extern unsigned char pcfich_first_reg_idx;

//unsigned short phich_reg[MAX_NUM_PHICH_GROUPS][3];

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uint8_t rv_table[4] = {0, 2, 3, 1};
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uint8_t get_mi(LTE_DL_FRAME_PARMS *frame_parms,uint8_t subframe)
{
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  // for FDD
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  if (frame_parms->frame_type == FDD)
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    return 1;

  // for TDD
  switch (frame_parms->tdd_config) {

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  case 0:
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    if ((subframe==0) || (subframe==5))
      return(2);
    else return(1);
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    break;
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  case 1:
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    if ((subframe==0) || (subframe==5))
      return(0);
    else return(1);
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    break;
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  case 2:
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    if ((subframe==3) || (subframe==8))
      return(1);
    else return(0);
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    break;
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  case 3:
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    if ((subframe==0) || (subframe==8) || (subframe==9))
      return(1);
    else return(0);
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    break;
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  case 4:
    if ((subframe==8) || (subframe==9))
      return(1);
    else return(0);
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    break;
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  case 5:
    if (subframe==8)
      return(1);
    else return(0);
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    break;
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  case 6:
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    return(1);
    break;

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  default:
    return(0);
  }
}

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unsigned char subframe2_ul_harq(LTE_DL_FRAME_PARMS *frame_parms,unsigned char subframe)
{
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  if (frame_parms->frame_type == FDD)
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    return(subframe&7);
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  switch (frame_parms->tdd_config) {
  case 3:
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    if ( (subframe == 8) || (subframe == 9) ) {
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      return(subframe-8);
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    } else if (subframe==0)
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      return(2);
    else {
      LOG_E(PHY,"phich.c: subframe2_ul_harq, illegal subframe %d for tdd_config %d\n",
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            subframe,frame_parms->tdd_config);
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      return(0);
    }
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    break;
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  case 4:
     if ( (subframe == 8) || (subframe == 9) ) {
       return(subframe-8);
     } else {
       LOG_E(PHY,"phich.c: subframe2_ul_harq, illegal subframe %d for tdd_config %d\n",
             subframe,frame_parms->tdd_config);
       return(0);
     }

     break;

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  }
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  return(0);
}

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uint8_t phich_frame2_pusch_frame(LTE_DL_FRAME_PARMS *frame_parms,frame_t frame,uint8_t subframe)
{
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  uint8_t pusch_frame = 255;
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  if (frame_parms->frame_type == FDD) {
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    pusch_frame = ((subframe<4) ? (frame - 1) : frame);
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  } else {
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    // Note this is not true, but it doesn't matter, the frame number is irrelevant for TDD!
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    pusch_frame = (frame);
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  }
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  LOG_D(PHY, "frame %d subframe %d: PUSCH frame = %d\n", frame, subframe, pusch_frame);
  return pusch_frame;
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}

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uint8_t phich_subframe2_pusch_subframe(LTE_DL_FRAME_PARMS *frame_parms,uint8_t subframe)
{
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  uint8_t pusch_subframe = 255;
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  if (frame_parms->frame_type == FDD)
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    return subframe < 4 ? subframe + 6 : subframe - 4;
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  switch (frame_parms->tdd_config) {
  case 0:
    if (subframe == 0)
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      pusch_subframe = (3);
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    else if (subframe == 5) {
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      pusch_subframe = (8);
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    } else if (subframe == 6)
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      pusch_subframe = (2);
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    else if (subframe == 1)
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      pusch_subframe = (7);
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    else {
      LOG_E(PHY, "phich.c: phich_subframe2_pusch_subframe, illegal subframe %d for tdd_config %d\n",
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            subframe,frame_parms->tdd_config);
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      pusch_subframe = (0);
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    }
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    break;
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  case 1:
    if (subframe == 6)
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      pusch_subframe = (2);
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    else if (subframe == 9)
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      pusch_subframe = (3);
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    else if (subframe == 1)
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      pusch_subframe = (7);
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    else if (subframe == 4)
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      pusch_subframe = (8);
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    else {
      LOG_E(PHY,"phich.c: phich_subframe2_pusch_subframe, illegal subframe %d for tdd_config %d\n",
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            subframe,frame_parms->tdd_config);
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      pusch_subframe = (0);
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    }
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    break;
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  case 2:
    if (subframe == 8)
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      pusch_subframe = (2);
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    else if (subframe == 3)
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      pusch_subframe = (7);
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    else {
      LOG_E(PHY,"phich.c: phich_subframe2_pusch_subframe, illegal subframe %d for tdd_config %d\n",
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            subframe,frame_parms->tdd_config);
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      pusch_subframe = (0);
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    }
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    break;
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  case 3:
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    if ( (subframe == 8) || (subframe == 9) ) {
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      pusch_subframe = (subframe-6);
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    } else if (subframe==0)
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      pusch_subframe = (4);
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    else {
      LOG_E(PHY,"phich.c: phich_subframe2_pusch_subframe, illegal subframe %d for tdd_config %d\n",
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            subframe,frame_parms->tdd_config);
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      pusch_subframe = (0);
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    }
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    break;
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  case 4:
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    if ( (subframe == 8) || (subframe == 9) ) {
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      pusch_subframe = (subframe-6);
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    } else {
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      LOG_E(PHY,"phich.c: phich_subframe2_pusch_subframe, illegal subframe %d for tdd_config %d\n",
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            subframe,frame_parms->tdd_config);
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      pusch_subframe = (0);
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    }
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    break;

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  case 5:
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    if (subframe == 8) {
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      pusch_subframe = (2);
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    } else {
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      LOG_E(PHY,"phich.c: phich_subframe2_pusch_subframe, illegal subframe %d for tdd_config %d\n",
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            subframe,frame_parms->tdd_config);
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      pusch_subframe = (0);
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    }
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    break;

  case 6:
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    if (subframe == 6) {
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      pusch_subframe = (2);
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    } else if (subframe == 9) {
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      pusch_subframe = (3);
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    } else if (subframe == 0) {
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      pusch_subframe = (4);
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    } else if (subframe == 1) {
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      pusch_subframe = (7);
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    } else if (subframe == 5) {
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      pusch_subframe = (8);
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    } else {
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      LOG_E(PHY,"phich.c: phich_subframe2_pusch_subframe, illegal subframe %d for tdd_config %d\n",
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            subframe,frame_parms->tdd_config);
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      pusch_subframe = (0);
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    }
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    break;
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  default:
    LOG_E(PHY, "no implementation for TDD UL/DL-config = %d!\n", frame_parms->tdd_config);
    pusch_subframe = (0);
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  }
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  LOG_D(PHY, "subframe  %d: PUSCH subframe = %d\n", subframe, pusch_subframe);
  return pusch_subframe;
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}

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int check_pcfich(LTE_DL_FRAME_PARMS *frame_parms,uint16_t reg)
{
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  if ((reg == frame_parms->pcfich_reg[0]) ||
      (reg == frame_parms->pcfich_reg[1]) ||
      (reg == frame_parms->pcfich_reg[2]) ||
      (reg == frame_parms->pcfich_reg[3]))
    return(1);
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  return(0);
}

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void generate_phich_reg_mapping(LTE_DL_FRAME_PARMS *frame_parms)
{
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  unsigned short n0 = (frame_parms->N_RB_DL * 2) - 4;  // 2 REG per RB less the 4 used by PCFICH in first symbol
  unsigned short n1 = (frame_parms->N_RB_DL * 3);      // 3 REG per RB in second and third symbol
  unsigned short n2 = n1;
  unsigned short mprime = 0;
  unsigned short Ngroup_PHICH;
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  //  uint16_t *phich_reg = frame_parms->phich_reg;
  uint16_t *pcfich_reg = frame_parms->pcfich_reg;
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  // compute Ngroup_PHICH (see formula at beginning of Section 6.9 in 36-211
  Ngroup_PHICH = (frame_parms->phich_config_common.phich_resource*frame_parms->N_RB_DL)/48;
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  if (((frame_parms->phich_config_common.phich_resource*frame_parms->N_RB_DL)%48) > 0)
    Ngroup_PHICH++;
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  // check if Extended prefix
  if (frame_parms->Ncp == 1) {
    Ngroup_PHICH<<=1;
  }
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  #ifdef DEBUG_PHICH
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  printf("Ngroup_PHICH %d (phich_config_common.phich_resource %d,phich_config_common.phich_duration %s, NidCell %d,Ncp %d, frame_type %d), smallest pcfich REG %d, n0 %d, n1 %d (first PHICH REG %d)\n",
	 ((frame_parms->Ncp == NORMAL)?Ngroup_PHICH:(Ngroup_PHICH>>1)),
	 frame_parms->phich_config_common.phich_resource,
	 frame_parms->phich_config_common.phich_duration==normal?"normal":"extended",
	 frame_parms->Nid_cell,frame_parms->Ncp,frame_parms->frame_type,
	 pcfich_reg[frame_parms->pcfich_first_reg_idx],
	 n0,
	 n1,
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	 ((frame_parms->Nid_cell))%n0);
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  #endif
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  // This is the algorithm from Section 6.9.3 in 36-211, it works only for normal PHICH duration for now ...
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  for (mprime=0; 
       mprime<((frame_parms->Ncp == NORMAL)?Ngroup_PHICH:(Ngroup_PHICH>>1)); 
       mprime++) {

    if (frame_parms->phich_config_common.phich_duration==normal) { // normal PHICH duration
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      frame_parms->phich_reg[mprime][0] = (frame_parms->Nid_cell + mprime)%n0;

      if (frame_parms->phich_reg[mprime][0]>=pcfich_reg[frame_parms->pcfich_first_reg_idx])
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        frame_parms->phich_reg[mprime][0]++;

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      if (frame_parms->phich_reg[mprime][0]>=pcfich_reg[(frame_parms->pcfich_first_reg_idx+1)&3])
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        frame_parms->phich_reg[mprime][0]++;

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      if (frame_parms->phich_reg[mprime][0]>=pcfich_reg[(frame_parms->pcfich_first_reg_idx+2)&3])
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        frame_parms->phich_reg[mprime][0]++;

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      if (frame_parms->phich_reg[mprime][0]>=pcfich_reg[(frame_parms->pcfich_first_reg_idx+3)&3])
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        frame_parms->phich_reg[mprime][0]++;
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      frame_parms->phich_reg[mprime][1] = (frame_parms->Nid_cell + mprime + (n0/3))%n0;

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      if (frame_parms->phich_reg[mprime][1]>=pcfich_reg[frame_parms->pcfich_first_reg_idx])
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        frame_parms->phich_reg[mprime][1]++;
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      if (frame_parms->phich_reg[mprime][1]>=pcfich_reg[(frame_parms->pcfich_first_reg_idx+1)&3])
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        frame_parms->phich_reg[mprime][1]++;

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      if (frame_parms->phich_reg[mprime][1]>=pcfich_reg[(frame_parms->pcfich_first_reg_idx+2)&3])
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        frame_parms->phich_reg[mprime][1]++;

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      if (frame_parms->phich_reg[mprime][1]>=pcfich_reg[(frame_parms->pcfich_first_reg_idx+3)&3])
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        frame_parms->phich_reg[mprime][1]++;
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      frame_parms->phich_reg[mprime][2] = (frame_parms->Nid_cell + mprime + (2*n0/3))%n0;
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      if (frame_parms->phich_reg[mprime][2]>=pcfich_reg[frame_parms->pcfich_first_reg_idx])
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        frame_parms->phich_reg[mprime][2]++;

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      if (frame_parms->phich_reg[mprime][2]>=pcfich_reg[(frame_parms->pcfich_first_reg_idx+1)&3])
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        frame_parms->phich_reg[mprime][2]++;

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      if (frame_parms->phich_reg[mprime][2]>=pcfich_reg[(frame_parms->pcfich_first_reg_idx+2)&3])
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        frame_parms->phich_reg[mprime][2]++;

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      if (frame_parms->phich_reg[mprime][2]>=pcfich_reg[(frame_parms->pcfich_first_reg_idx+3)&3])
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        frame_parms->phich_reg[mprime][2]++;
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      #ifdef DEBUG_PHICH
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      printf("phich_reg :%d => %d,%d,%d\n",mprime,frame_parms->phich_reg[mprime][0],frame_parms->phich_reg[mprime][1],frame_parms->phich_reg[mprime][2]);
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      #endif
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    } else { // extended PHICH duration
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      frame_parms->phich_reg[mprime<<1][0] = (frame_parms->Nid_cell + mprime)%n0;
      frame_parms->phich_reg[1+(mprime<<1)][0] = (frame_parms->Nid_cell + mprime)%n0;

      frame_parms->phich_reg[mprime<<1][1] = ((frame_parms->Nid_cell*n1/n0) + mprime + (n1/3))%n1;
      frame_parms->phich_reg[mprime<<1][2] = ((frame_parms->Nid_cell*n2/n0) + mprime + (2*n2/3))%n2;

      frame_parms->phich_reg[1+(mprime<<1)][1] = ((frame_parms->Nid_cell*n1/n0) + mprime + (n1/3))%n1;
      frame_parms->phich_reg[1+(mprime<<1)][2] = ((frame_parms->Nid_cell*n2/n0) + mprime + (2*n2/3))%n2;
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      //#ifdef DEBUG_PHICH
      printf("phich_reg :%d => %d,%d,%d\n",mprime<<1,frame_parms->phich_reg[mprime<<1][0],frame_parms->phich_reg[mprime][1],frame_parms->phich_reg[mprime][2]);
      printf("phich_reg :%d => %d,%d,%d\n",1+(mprime<<1),frame_parms->phich_reg[1+(mprime<<1)][0],frame_parms->phich_reg[1+(mprime<<1)][1],frame_parms->phich_reg[1+(mprime<<1)][2]);
      //#endif
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    }
  } // mprime loop
}  // num_pdcch_symbols loop


void generate_phich_emul(LTE_DL_FRAME_PARMS *frame_parms,
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                         uint8_t HI,
                         uint8_t subframe)
{
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}

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int32_t alam_bpsk_perm1[4] = {2,1,4,3}; // -conj(x) 1 (-1-j) -> 2 (1-j), 2->1, 3 (-1+j) -> (4) 1+j, 4->3
int32_t alam_bpsk_perm2[4] = {3,4,2,1}; // conj(x) 1 (-1-j) -> 3 (-1+j), 3->1, 2 (1-j) -> 4 (1+j), 4->2
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// This routine generates the PHICH
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void generate_phich(LTE_DL_FRAME_PARMS *frame_parms,
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                    int16_t amp,
                    uint8_t nseq_PHICH,
                    uint8_t ngroup_PHICH,
                    uint8_t HI,
                    uint8_t subframe,
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                    int32_t **y)
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{

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  int16_t d[24],*dp;
  //  unsigned int i,aa;
  unsigned int re_offset;
  int16_t y0_16[8],y1_16[8];
  int16_t *y0,*y1;
  // scrambling
  uint32_t x1, x2, s=0;
  uint8_t reset = 1;
  int16_t cs[12];
  uint32_t i,i2,i3,m,j;
  int16_t gain_lin_QPSK;
  uint32_t subframe_offset=((frame_parms->Ncp==0)?14:12)*frame_parms->ofdm_symbol_size*subframe;

  memset(d,0,24*sizeof(int16_t));

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  if (frame_parms->mode1_flag==1)
    gain_lin_QPSK = (int16_t)(((int32_t)amp*ONE_OVER_SQRT2_Q15)>>15);
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  else
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    gain_lin_QPSK = amp/2;
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  //printf("PHICH : gain_lin_QPSK %d\n",gain_lin_QPSK);

  // BPSK modulation of HI input (to be repeated 3 times, 36-212 Section 5.3.5, p. 56 in v8.6)
  if (HI>0)
    HI=1;
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  //  c = (1-(2*HI))*SSS_AMP;
  // x1 is set in lte_gold_generic
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  x2 = (((subframe+1)*((frame_parms->Nid_cell<<1)+1))<<9) + frame_parms->Nid_cell;
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  s = lte_gold_generic(&x1, &x2, reset);
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  // compute scrambling sequence
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  for (i=0; i<12; i++) {
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    cs[i] = (uint8_t)((s>>(i&0x1f))&1);
    cs[i] = (cs[i] == 0) ? (1-(HI<<1)) : ((HI<<1)-1);
  }

  if (frame_parms->Ncp == 0) { // Normal Cyclic Prefix

    //    printf("Doing PHICH : Normal CP, subframe %d\n",subframe);
    // 12 output symbols (Msymb)
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    for (i=0,i2=0,i3=0; i<3; i++,i2+=4,i3+=8) {
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      switch (nseq_PHICH) {
      case 0: // +1 +1 +1 +1
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        d[i3]   = cs[i2];
        d[1+i3] = cs[i2];
        d[2+i3] = cs[1+i2];
        d[3+i3] = cs[1+i2];
        d[4+i3] = cs[2+i2];
        d[5+i3] = cs[2+i2];
        d[6+i3] = cs[3+i2];
        d[7+i3] = cs[3+i2];
        break;

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      case 1: // +1 -1 +1 -1
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        d[i3] = cs[i2];
        d[1+i3] = cs[i2];
        d[2+i3] = -cs[1+i2];
        d[3+i3] = -cs[1+i2];
        d[4+i3] = cs[2+i2];
        d[5+i3] = cs[2+i2];
        d[6+i3] = -cs[3+i2];
        d[7+i3] = -cs[3+i2];
        break;

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      case 2: // +1 +1 -1 -1
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        d[i3]   = cs[i2];
        d[1+i3]   = cs[i2];
        d[2+i3] = cs[1+i2];
        d[3+i3] = cs[1+i2];
        d[4+i3] = -cs[2+i2];
        d[5+i3] = -cs[2+i2];
        d[6+i3] = -cs[3+i2];
        d[7+i3] = -cs[3+i2];
        break;

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      case 3: // +1 -1 -1 +1
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        d[i3]   = cs[i2];
        d[1+i3]   = cs[i2];
        d[2+i3] = -cs[1+i2];
        d[3+i3] = -cs[1+i2];
        d[4+i3] = -cs[2+i2];
        d[5+i3] = -cs[2+i2];
        d[6+i3] = cs[3+i2];
        d[7+i3] = cs[3+i2];
        break;

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      case 4: // +j +j +j +j
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        d[i3]   = -cs[i2];
        d[1+i3] = cs[i2];
        d[2+i3] = -cs[1+i2];
        d[3+i3] = cs[1+i2];
        d[4+i3] = -cs[2+i2];
        d[5+i3] = cs[2+i2];
        d[6+i3] = -cs[3+i2];
        d[7+i3] = cs[3+i2];
        break;

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      case 5: // +j -j +j -j
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        d[1+i3] = cs[i2];
        d[3+i3] = -cs[1+i2];
        d[5+i3] = cs[2+i2];
        d[7+i3] = -cs[3+i2];
        d[i3]   = -cs[i2];
        d[2+i3] = cs[1+i2];
        d[4+i3] = -cs[2+i2];
        d[6+i3] = cs[3+i2];
        break;

539
      case 6: // +j +j -j -j
540 541 542 543 544 545 546 547 548 549
        d[1+i3] = cs[i2];
        d[3+i3] = cs[1+i2];
        d[5+i3] = -cs[2+i2];
        d[7+i3] = -cs[3+i2];
        d[i3]   = -cs[i2];
        d[2+i3] = -cs[1+i2];
        d[4+i3] = cs[2+i2];
        d[6+i3] = cs[3+i2];
        break;

550
      case 7: // +j -j -j +j
551 552 553 554 555 556 557 558 559 560
        d[1+i3] = cs[i2];
        d[3+i3] = -cs[1+i2];
        d[5+i3] = -cs[2+i2];
        d[7+i3] = cs[3+i2];
        d[i3]   = -cs[i2];
        d[2+i3] = cs[1+i2];
        d[4+i3] = cs[2+i2];
        d[6+i3] = -cs[3+i2];
        break;

561
      default:
562
        LOG_E(PHY,"phich_coding.c: Illegal PHICH Number\n");
563 564
      } // nseq_PHICH
    }
565

566 567
#ifdef DEBUG_PHICH
    LOG_D(PHY,"[PUSCH 0]PHICH d = ");
568 569

    for (i=0; i<24; i+=2)
570
      LOG_D(PHY,"(%d,%d)",d[i],d[i+1]);
571

572 573
    LOG_D(PHY,"\n");
#endif
574 575

    // modulation here
576 577
    if (frame_parms->mode1_flag == 0) {
      // do Alamouti precoding here
578

579 580 581 582
      // Symbol 0
      re_offset = frame_parms->first_carrier_offset + (frame_parms->phich_reg[ngroup_PHICH][0]*6);

      if (re_offset > frame_parms->ofdm_symbol_size)
583
        re_offset -= (frame_parms->ofdm_symbol_size-1);
584 585 586

      y0 = (int16_t*)&y[0][re_offset+subframe_offset];
      y1 = (int16_t*)&y[1][re_offset+subframe_offset];
587

588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611
      // first antenna position n -> x0
      y0_16[0]   = d[0]*gain_lin_QPSK;
      y0_16[1]   = d[1]*gain_lin_QPSK;
      // second antenna position n -> -x1*
      y1_16[0]   = -d[2]*gain_lin_QPSK;
      y1_16[1]   = d[3]*gain_lin_QPSK;
      // fill in the rest of the ALAMOUTI precoding
      y0_16[2] = -y1_16[0];
      y0_16[3] = y1_16[1];
      y1_16[2] = y0_16[0];
      y1_16[3] = -y0_16[1];

      // first antenna position n -> x0
      y0_16[4]   = d[4]*gain_lin_QPSK;
      y0_16[5]   = d[5]*gain_lin_QPSK;
      // second antenna position n -> -x1*
      y1_16[4]   = -d[6]*gain_lin_QPSK;
      y1_16[5]   = d[7]*gain_lin_QPSK;
      // fill in the rest of the ALAMOUTI precoding
      y0_16[6] = -y1_16[4];
      y0_16[7] = y1_16[5];
      y1_16[6] = y0_16[4];
      y1_16[7] = -y0_16[5];

612 613 614 615 616 617 618
      for (i=0,j=0,m=0; i<6; i++,j+=2) {
        if ((i!=(frame_parms->nushift))&&(i!=(frame_parms->nushift+3))) {
          y0[j]   += y0_16[m];
          y1[j]   += y1_16[m++];
          y0[j+1] += y0_16[m];
          y1[j+1] += y1_16[m++];
        }
619
      }
620

621 622 623 624
      // Symbol 1
      re_offset = frame_parms->first_carrier_offset + (frame_parms->phich_reg[ngroup_PHICH][1]*6);

      if (re_offset > frame_parms->ofdm_symbol_size)
625
        re_offset -= (frame_parms->ofdm_symbol_size-1);
626 627 628

      y0 = (int16_t*)&y[0][re_offset+subframe_offset];
      y1 = (int16_t*)&y[1][re_offset+subframe_offset];
629

630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653
      // first antenna position n -> x0
      y0_16[0]   = d[8]*gain_lin_QPSK;
      y0_16[1]   = d[9]*gain_lin_QPSK;
      // second antenna position n -> -x1*
      y1_16[0]   = -d[10]*gain_lin_QPSK;
      y1_16[1]   = d[11]*gain_lin_QPSK;
      // fill in the rest of the ALAMOUTI precoding
      y0_16[2] = -y1_16[0];
      y0_16[3] = y1_16[1];
      y1_16[2] = y0_16[0];
      y1_16[3] = -y0_16[1];

      // first antenna position n -> x0
      y0_16[4]   = d[12]*gain_lin_QPSK;
      y0_16[5]   = d[13]*gain_lin_QPSK;
      // second antenna position n -> -x1*
      y1_16[4]   = -d[14]*gain_lin_QPSK;
      y1_16[5]   = d[15]*gain_lin_QPSK;
      // fill in the rest of the ALAMOUTI precoding
      y0_16[6] = -y1_16[4];
      y0_16[7] = y1_16[5];
      y1_16[6] = y0_16[4];
      y1_16[7] = -y0_16[5];

654 655 656 657 658 659 660
      for (i=0,j=0,m=0; i<6; i++,j+=2) {
        if ((i!=(frame_parms->nushift))&&(i!=(frame_parms->nushift+3))) {
          y0[j]   += y0_16[m];
          y1[j]   += y1_16[m++];
          y0[j+1] += y0_16[m];
          y1[j+1] += y1_16[m++];
        }
661 662 663 664 665 666
      }

      // Symbol 2
      re_offset = frame_parms->first_carrier_offset + (frame_parms->phich_reg[ngroup_PHICH][2]*6);

      if (re_offset > frame_parms->ofdm_symbol_size)
667
        re_offset -= (frame_parms->ofdm_symbol_size-1);
668 669 670

      y0 = (int16_t*)&y[0][re_offset+subframe_offset];
      y1 = (int16_t*)&y[1][re_offset+subframe_offset];
671

672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695
      // first antenna position n -> x0
      y0_16[0]   = d[16]*gain_lin_QPSK;
      y0_16[1]   = d[17]*gain_lin_QPSK;
      // second antenna position n -> -x1*
      y1_16[0]   = -d[18]*gain_lin_QPSK;
      y1_16[1]   = d[19]*gain_lin_QPSK;
      // fill in the rest of the ALAMOUTI precoding
      y0_16[2] = -y1_16[0];
      y0_16[3] = y1_16[1];
      y1_16[2] = y0_16[0];
      y1_16[3] = -y0_16[1];

      // first antenna position n -> x0
      y0_16[4]   = d[20]*gain_lin_QPSK;
      y0_16[5]   = d[21]*gain_lin_QPSK;
      // second antenna position n -> -x1*
      y1_16[4]   = -d[22]*gain_lin_QPSK;
      y1_16[5]   = d[23]*gain_lin_QPSK;
      // fill in the rest of the ALAMOUTI precoding
      y0_16[6] = -y1_16[4];
      y0_16[7] = y1_16[5];
      y1_16[6] = y0_16[4];
      y1_16[7] = -y0_16[5];

696 697 698 699 700 701 702
      for (i=0,j=0,m=0; i<6; i++,j+=2) {
        if ((i!=(frame_parms->nushift))&&(i!=(frame_parms->nushift+3))) {
          y0[j]   += y0_16[m];
          y1[j]   += y1_16[m++];
          y0[j+1] += y0_16[m];
          y1[j+1] += y1_16[m++];
        }
703 704 705 706 707 708 709 710 711 712
      }

    } // mode1_flag

    else {
      // Symbol 0
      //      printf("[PUSCH 0]PHICH REG %d\n",frame_parms->phich_reg[ngroup_PHICH][0]);
      re_offset = frame_parms->first_carrier_offset + (frame_parms->phich_reg[ngroup_PHICH][0]*6);

      if (re_offset > frame_parms->ofdm_symbol_size)
713
        re_offset -= (frame_parms->ofdm_symbol_size-1);
714 715 716 717 718 719 720 721 722 723 724 725 726

      y0 = (int16_t*)&y[0][re_offset+subframe_offset];
      //      printf("y0 %p\n",y0);

      y0_16[0]   = d[0]*gain_lin_QPSK;
      y0_16[1]   = d[1]*gain_lin_QPSK;
      y0_16[2]   = d[2]*gain_lin_QPSK;
      y0_16[3]   = d[3]*gain_lin_QPSK;
      y0_16[4]   = d[4]*gain_lin_QPSK;
      y0_16[5]   = d[5]*gain_lin_QPSK;
      y0_16[6]   = d[6]*gain_lin_QPSK;
      y0_16[7]   = d[7]*gain_lin_QPSK;

727 728 729 730 731
      for (i=0,j=0,m=0; i<6; i++,j+=2) {
        if ((i!=(frame_parms->nushift))&&(i!=(frame_parms->nushift+3))) {
          y0[j]   += y0_16[m++];
          y0[j+1] += y0_16[m++];
        }
732
      }
733

734 735 736 737 738
      // Symbol 1
      //      printf("[PUSCH 0]PHICH REG %d\n",frame_parms->phich_reg[ngroup_PHICH][1]);
      re_offset = frame_parms->first_carrier_offset + (frame_parms->phich_reg[ngroup_PHICH][1]*6);

      if (re_offset > frame_parms->ofdm_symbol_size)
739
        re_offset -= (frame_parms->ofdm_symbol_size-1);
740 741

      y0 = (int16_t*)&y[0][re_offset+subframe_offset];
742

743 744 745 746 747 748 749 750 751
      y0_16[0]   = d[8]*gain_lin_QPSK;
      y0_16[1]   = d[9]*gain_lin_QPSK;
      y0_16[2]   = d[10]*gain_lin_QPSK;
      y0_16[3]   = d[11]*gain_lin_QPSK;
      y0_16[4]   = d[12]*gain_lin_QPSK;
      y0_16[5]   = d[13]*gain_lin_QPSK;
      y0_16[6]   = d[14]*gain_lin_QPSK;
      y0_16[7]   = d[15]*gain_lin_QPSK;

752 753 754 755 756
      for (i=0,j=0,m=0; i<6; i++,j+=2) {
        if ((i!=(frame_parms->nushift))&&(i!=(frame_parms->nushift+3))) {
          y0[j]   += y0_16[m++];
          y0[j+1] += y0_16[m++];
        }
757 758 759 760 761 762 763
      }

      // Symbol 2
      re_offset = frame_parms->first_carrier_offset + (frame_parms->phich_reg[ngroup_PHICH][2]*6);

      //      printf("[PUSCH 0]PHICH REG %d\n",frame_parms->phich_reg[ngroup_PHICH][2]);
      if (re_offset > frame_parms->ofdm_symbol_size)
764 765
        re_offset -= (frame_parms->ofdm_symbol_size-1);

766
      y0 = (int16_t*)&y[0][re_offset+subframe_offset];
767

768 769 770 771 772 773 774 775 776
      y0_16[0]   = d[16]*gain_lin_QPSK;
      y0_16[1]   = d[17]*gain_lin_QPSK;
      y0_16[2]   = d[18]*gain_lin_QPSK;
      y0_16[3]   = d[19]*gain_lin_QPSK;
      y0_16[4]   = d[20]*gain_lin_QPSK;
      y0_16[5]   = d[21]*gain_lin_QPSK;
      y0_16[6]   = d[22]*gain_lin_QPSK;
      y0_16[7]   = d[23]*gain_lin_QPSK;

777 778 779 780 781
      for (i=0,j=0,m=0; i<6; i++,j+=2) {
        if ((i!=(frame_parms->nushift))&&(i!=(frame_parms->nushift+3))) {
          y0[j]   += y0_16[m++];
          y0[j+1] += y0_16[m++];
        }
782
      }
783

784 785
      /*
      for (i=0;i<512;i++)
786
      printf("re %d (%d): %d,%d\n",i,subframe_offset+i,((int16_t*)&y[0][subframe_offset+i])[0],((int16_t*)&y[0][subframe_offset+i])[1]);
787 788
      */
    } // mode1_flag
789 790
  } else { // extended prefix

791 792 793
    // 6 output symbols
    if ((ngroup_PHICH & 1) == 1)
      dp = &d[4];
794
    else
795 796 797
      dp = d;

    switch (nseq_PHICH) {
798
    case 0: // +1 +1
799 800 801 802 803 804 805 806 807 808 809 810 811
      dp[0]  = cs[0];
      dp[2]  = cs[1];
      dp[8]  = cs[2];
      dp[10] = cs[3];
      dp[16] = cs[4];
      dp[18] = cs[5];
      dp[1]  = cs[0];
      dp[3]  = cs[1];
      dp[9]  = cs[2];
      dp[11] = cs[3];
      dp[17] = cs[4];
      dp[19] = cs[5];
      break;
812

813 814 815 816 817 818 819 820 821 822 823 824 825 826
    case 1: // +1 -1
      dp[0]  = cs[0];
      dp[2]  = -cs[1];
      dp[8]  = cs[2];
      dp[10] = -cs[3];
      dp[16] = cs[4];
      dp[18] = -cs[5];
      dp[1]  = cs[0];
      dp[3]  = -cs[1];
      dp[9]  = cs[2];
      dp[11] = -cs[3];
      dp[17] = cs[4];
      dp[19] = -cs[5];
      break;
827 828

    case 2: // +j +j
829 830 831 832 833 834 835 836 837 838 839 840
      dp[1]  = cs[0];
      dp[3]  = cs[1];
      dp[9]  = cs[2];
      dp[11] = cs[3];
      dp[17] = cs[4];
      dp[19] = cs[5];
      dp[0]  = -cs[0];
      dp[2]  = -cs[1];
      dp[8]  = -cs[2];
      dp[10] = -cs[3];
      dp[16] = -cs[4];
      dp[18] = -cs[5];
841

842
      break;
843 844

    case 3: // +j -j
845 846 847 848 849 850 851 852 853 854 855 856 857
      dp[1]  = cs[0];
      dp[3]  = -cs[1];
      dp[9]  = cs[2];
      dp[11] = -cs[3];
      dp[17] = cs[4];
      dp[19] = -cs[5];
      dp[0]  = -cs[0];
      dp[2]  = cs[1];
      dp[8]  = -cs[2];
      dp[10] = cs[3];
      dp[16] = -cs[4];
      dp[18] = cs[5];
      break;
858

859 860 861
    default:
      LOG_E(PHY,"phich_coding.c: Illegal PHICH Number\n");
    }
862 863 864



865 866 867 868
    if (frame_parms->mode1_flag == 0) {
      // do Alamouti precoding here
      // Symbol 0
      re_offset = frame_parms->first_carrier_offset + (frame_parms->phich_reg[ngroup_PHICH][0]*6);
869

870
      if (re_offset > frame_parms->ofdm_symbol_size)
871
        re_offset -= (frame_parms->ofdm_symbol_size-1);
872 873 874

      y0 = (int16_t*)&y[0][re_offset+subframe_offset];
      y1 = (int16_t*)&y[1][re_offset+subframe_offset];
875

876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899
      // first antenna position n -> x0
      y0_16[0]   = d[0]*gain_lin_QPSK;
      y0_16[1]   = d[1]*gain_lin_QPSK;
      // second antenna position n -> -x1*
      y1_16[0]   = -d[2]*gain_lin_QPSK;
      y1_16[1]   = d[3]*gain_lin_QPSK;
      // fill in the rest of the ALAMOUTI precoding
      y0_16[2] = -y1_16[0];
      y0_16[3] = y1_16[1];
      y1_16[2] = y0_16[0];
      y1_16[3] = -y0_16[1];

      // first antenna position n -> x0
      y0_16[4]   = d[4]*gain_lin_QPSK;
      y0_16[5]   = d[5]*gain_lin_QPSK;
      // second antenna position n -> -x1*
      y1_16[4]   = -d[6]*gain_lin_QPSK;
      y1_16[5]   = d[7]*gain_lin_QPSK;
      // fill in the rest of the ALAMOUTI precoding
      y0_16[6] = -y1_16[4];
      y0_16[7] = y1_16[5];
      y1_16[6] = y0_16[4];
      y1_16[7] = -y0_16[5];

900 901 902 903 904 905 906
      for (i=0,j=0,m=0; i<6; i++,j+=2) {
        if ((i!=(frame_parms->nushift))&&(i!=(frame_parms->nushift+3))) {
          y0[j] += y0_16[m];
          y1[j] += y1_16[m++];
          y0[j+1] += y0_16[m];
          y1[j+1] += y1_16[m++];
        }
907 908 909 910
      }

      // Symbol 1
      re_offset = frame_parms->first_carrier_offset + (frame_parms->phich_reg[ngroup_PHICH][1]<<2);
911

912
      if (re_offset > frame_parms->ofdm_symbol_size)
913 914
        re_offset -= (frame_parms->ofdm_symbol_size-1);

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
      re_offset += (frame_parms->ofdm_symbol_size);

      y0 = (int16_t*)&y[0][re_offset+subframe_offset];
      y1 = (int16_t*)&y[1][re_offset+subframe_offset];

      // first antenna position n -> x0
      y0_16[0]   = d[8]*gain_lin_QPSK;
      y0_16[1]   = d[9]*gain_lin_QPSK;
      // second antenna position n -> -x1*
      y1_16[0]   = -d[10]*gain_lin_QPSK;
      y1_16[1]   = d[11]*gain_lin_QPSK;
      // fill in the rest of the ALAMOUTI precoding
      y0_16[2] = -y1_16[0];
      y0_16[3] = y1_16[1];
      y1_16[2] = y0_16[0];
      y1_16[3] = -y0_16[1];

      // first antenna position n -> x0
      y0_16[4]   = d[12]*gain_lin_QPSK;
      y0_16[5]   = d[13]*gain_lin_QPSK;
      // second antenna position n -> -x1*
      y1_16[4]   = -d[14]*gain_lin_QPSK;
      y1_16[5]   = d[15]*gain_lin_QPSK;
      // fill in the rest of the ALAMOUTI precoding
      y0_16[6] = -y1_16[4];
      y0_16[7] = y1_16[5];
      y1_16[6] = y0_16[4];
      y1_16[7] = -y0_16[5];

944 945 946 947 948
      for (i=0,j=0,m=0; i<4; i++,j+=2) {
        y0[j] += y0_16[m];
        y1[j] += y1_16[m++];
        y0[j+1] += y0_16[m];
        y1[j+1] += y1_16[m++];
949 950 951 952
      }

      // Symbol 2
      re_offset = frame_parms->first_carrier_offset +  (frame_parms->phich_reg[ngroup_PHICH][2]<<2);
953

954
      if (re_offset > frame_parms->ofdm_symbol_size)
955 956
        re_offset -= (frame_parms->ofdm_symbol_size-1);

957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985
      re_offset += (frame_parms->ofdm_symbol_size<<1);

      y0 = (int16_t*)&y[0][re_offset+subframe_offset];
      y1 = (int16_t*)&y[1][re_offset+subframe_offset];

      // first antenna position n -> x0
      y0_16[0]   = d[16]*gain_lin_QPSK;
      y0_16[1]   = d[17]*gain_lin_QPSK;
      // second antenna position n -> -x1*
      y1_16[0]   = -d[18]*gain_lin_QPSK;
      y1_16[1]   = d[19]*gain_lin_QPSK;
      // fill in the rest of the ALAMOUTI precoding
      y0_16[2] = -y1_16[0];
      y0_16[3] = y1_16[1];
      y1_16[2] = y0_16[0];
      y1_16[3] = -y0_16[1];

      // first antenna position n -> x0
      y0_16[4]   = d[20]*gain_lin_QPSK;
      y0_16[5]   = d[21]*gain_lin_QPSK;
      // second antenna position n -> -x1*
      y1_16[4]   = -d[22]*gain_lin_QPSK;
      y1_16[5]   = d[23]*gain_lin_QPSK;
      // fill in the rest of the ALAMOUTI precoding
      y0_16[6] = -y1_16[4];
      y0_16[7] = y1_16[5];
      y1_16[6] = y0_16[4];
      y1_16[7] = -y0_16[5];

986 987 988 989 990
      for (i=0,j=0,m=0; i<4; i++,j+=2) {
        y0[j]   += y0_16[m];
        y1[j]   += y1_16[m++];
        y0[j+1] += y0_16[m];
        y1[j+1] += y1_16[m++];
991
      }
992
    } else {
993 994 995

      // Symbol 0
      re_offset = frame_parms->first_carrier_offset + (frame_parms->phich_reg[ngroup_PHICH][0]*6);
996

997
      if (re_offset > frame_parms->ofdm_symbol_size)
998
        re_offset -= (frame_parms->ofdm_symbol_size-1);
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      y0 = (int16_t*)&y[0][re_offset+subframe_offset];
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      y0_16[0]   = d[0]*gain_lin_QPSK;
      y0_16[1]   = d[1]*gain_lin_QPSK;
      y0_16[2]   = d[2]*gain_lin_QPSK;
      y0_16[3]   = d[3]*gain_lin_QPSK;
      y0_16[4]   = d[4]*gain_lin_QPSK;
      y0_16[5]   = d[5]*gain_lin_QPSK;
      y0_16[6]   = d[6]*gain_lin_QPSK;
      y0_16[7]   = d[7]*gain_lin_QPSK;

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      for (i=0,j=0,m=0; i<6; i++,j+=2) {
        if ((i!=(frame_parms->nushift))&&(i!=(frame_parms->nushift+3))) {
          y0[j] += y0_16[m++];
          y0[j+1] += y0_16[m++];
        }
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      }

      // Symbol 1
      re_offset = frame_parms->first_carrier_offset + (frame_parms->phich_reg[ngroup_PHICH][1]<<2);
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      if (re_offset > frame_parms->ofdm_symbol_size)
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        re_offset -= (frame_parms->ofdm_symbol_size-1);

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      re_offset += (frame_parms->ofdm_symbol_size);

      y0 = (int16_t*)&y[0][re_offset+subframe_offset];
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      y0_16[0]   = d[8]*gain_lin_QPSK;
      y0_16[1]   = d[9]*gain_lin_QPSK;
      y0_16[2]   = d[10]*gain_lin_QPSK;
      y0_16[3]   = d[11]*gain_lin_QPSK;
      y0_16[4]   = d[12]*gain_lin_QPSK;
      y0_16[5]   = d[13]*gain_lin_QPSK;
      y0_16[6]   = d[14]*gain_lin_QPSK;
      y0_16[7]   = d[15]*gain_lin_QPSK;

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      for (i=0,j=0,m=0; i<4; i++,j+=2) {
        y0[j] += y0_16[m++];
        y0[j+1] += y0_16[m++];
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      }


      // Symbol 2
      re_offset = frame_parms->first_carrier_offset + (frame_parms->phich_reg[ngroup_PHICH][2]<<2);
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      if (re_offset > frame_parms->ofdm_symbol_size)
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        re_offset -= (frame_parms->ofdm_symbol_size-1);

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      re_offset += (frame_parms->ofdm_symbol_size<<1);

      y0 = (int16_t*)&y[0][re_offset+subframe_offset];
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      y0_16[0]   = d[16]*gain_lin_QPSK;
      y0_16[1]   = d[17]*gain_lin_QPSK;
      y0_16[2]   = d[18]*gain_lin_QPSK;
      y0_16[3]   = d[19]*gain_lin_QPSK;
      y0_16[4]   = d[20]*gain_lin_QPSK;
      y0_16[5]   = d[21]*gain_lin_QPSK;
      y0_16[6]   = d[22]*gain_lin_QPSK;
      y0_16[7]   = d[23]*gain_lin_QPSK;

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      for (i=0,j=0,m=0; i<4; i++) {
        y0[j]   += y0_16[m++];
        y0[j+1] += y0_16[m++];
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      }

    } // mode1_flag
  } // normal/extended prefix
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}
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// This routine demodulates the PHICH and updates PUSCH/ULSCH parameters

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void rx_phich(PHY_VARS_UE *ue,
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	      UE_rxtx_proc_t *proc,
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              uint8_t subframe,
              uint8_t eNB_id)
{
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  LTE_DL_FRAME_PARMS *frame_parms=&ue->frame_parms;
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  LTE_UE_PDCCH **pdcch_vars = &ue->pdcch_vars[subframe%RX_NB_TH][eNB_id];
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  //  uint8_t HI;
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  uint8_t harq_pid = phich_subframe_to_harq_pid(frame_parms,proc->frame_rx,subframe);
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  LTE_UE_ULSCH_t *ulsch = ue->ulsch[eNB_id];
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  int16_t phich_d[24],*phich_d_ptr,HI16;
  //  unsigned int i,aa;
  int8_t d[24],*dp;
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  uint16_t reg_offset;
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  // scrambling
  uint32_t x1, x2, s=0;
  uint8_t reset = 1;
  int16_t cs[12];
  uint32_t i,i2,i3,phich_quad;
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  int32_t **rxdataF_comp = pdcch_vars[eNB_id]->rxdataF_comp;
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  uint8_t Ngroup_PHICH,ngroup_PHICH,nseq_PHICH;
  uint8_t NSF_PHICH = 4;
  uint8_t pusch_subframe;
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  int8_t delta_PUSCH_acc[4] = {-1,0,1,3};

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  // check if we're expecting a PHICH in this subframe
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  LOG_D(PHY,"[UE  %d][PUSCH %d] Frame %d subframe %d PHICH RX\n",ue->Mod_id,harq_pid,proc->frame_rx,subframe);
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  if (!ulsch)
    return;
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  LOG_D(PHY,"[UE  %d][PUSCH %d] Frame %d subframe %d PHICH RX Status: %d \n",ue->Mod_id,harq_pid,proc->frame_rx,subframe, ulsch->harq_processes[harq_pid]->status);

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  if (ulsch->harq_processes[harq_pid]->status == ACTIVE) {
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     LOG_D(PHY,"[UE  %d][PUSCH %d] Frame %d subframe %d PHICH RX ACTIVE\n",ue->Mod_id,harq_pid,proc->frame_rx,subframe);
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    Ngroup_PHICH = (frame_parms->phich_config_common.phich_resource*frame_parms->N_RB_DL)/48;
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    if (((frame_parms->phich_config_common.phich_resource*frame_parms->N_RB_DL)%48) > 0)
      Ngroup_PHICH++;
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    if (frame_parms->Ncp == 1)
      NSF_PHICH = 2;

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    ngroup_PHICH = (ulsch->harq_processes[harq_pid]->first_rb +
                    ulsch->harq_processes[harq_pid]->n_DMRS)%Ngroup_PHICH;

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1125
    if ((frame_parms->tdd_config == 0) && (frame_parms->frame_type == TDD) ) {
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      pusch_subframe = phich_subframe2_pusch_subframe(frame_parms,subframe);
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      if ((pusch_subframe == 4) || (pusch_subframe == 9))
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        ngroup_PHICH += Ngroup_PHICH;
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    }
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    nseq_PHICH = ((ulsch->harq_processes[harq_pid]->first_rb/Ngroup_PHICH) +
                  ulsch->harq_processes[harq_pid]->n_DMRS)%(2*NSF_PHICH);
  } else {
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    LOG_D(PHY,"[UE  %d][PUSCH %d] Frame %d subframe %d PHICH RX %s\n",
        ue->Mod_id,
        harq_pid,
        proc->frame_rx,
        subframe,
        (ulsch->harq_processes[harq_pid]->status==SCH_IDLE?   "SCH_IDLE"  :
        (ulsch->harq_processes[harq_pid]->status==ACTIVE?     "ACTIVE"    :
        (ulsch->harq_processes[harq_pid]->status==CBA_ACTIVE? "CBA_ACTIVE":
        (ulsch->harq_processes[harq_pid]->status==DISABLED?   "DISABLED"  : "UNKNOWN")))));

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    return;
  }

  memset(d,0,24*sizeof(int8_t));
  phich_d_ptr = phich_d;

  // x1 is set in lte_gold_generic
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  x2 = (((subframe+1)*((frame_parms->Nid_cell<<1)+1))<<9) + frame_parms->Nid_cell;
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  s = lte_gold_generic(&x1, &x2, reset);
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  // compute scrambling sequence
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  for (i=0; i<12; i++) {
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    cs[i] = 1-(((s>>(i&0x1f))&1)<<1);
  }

  if (frame_parms->Ncp == 0) { // Normal Cyclic Prefix


    // 12 output symbols (Msymb)

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    for (i=0,i2=0,i3=0; i<3; i++,i2+=4,i3+=8) {
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      switch (nseq_PHICH) {
      case 0: // +1 +1 +1 +1
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        d[i3]   = cs[i2];
        d[1+i3] = cs[i2];
        d[2+i3] = cs[1+i2];
        d[3+i3] = cs[1+i2];
        d[4+i3] = cs[2+i2];
        d[5+i3] = cs[2+i2];
        d[6+i3] = cs[3+i2];
        d[7+i3] = cs[3+i2];
        break;

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      case 1: // +1 -1 +1 -1
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        d[i3] = cs[i2];
        d[1+i3] = cs[i2];
        d[2+i3] = -cs[1+i2];
        d[3+i3] = -cs[1+i2];
        d[4+i3] = cs[2+i2];
        d[5+i3] = cs[2+i2];
        d[6+i3] = -cs[3+i2];
        d[7+i3] = -cs[3+i2];
        break;

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      case 2: // +1 +1 -1 -1
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        d[i3]   = cs[i2];
        d[1+i3]   = cs[i2];
        d[2+i3] = cs[1+i2];
        d[3+i3] = cs[1+i2];
        d[4+i3] = -cs[2+i2];
        d[5+i3] = -cs[2+i2];
        d[6+i3] = -cs[3+i2];
        d[7+i3] = -cs[3+i2];
        break;

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      case 3: // +1 -1 -1 +1
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        d[i3]   = cs[i2];
        d[1+i3]   = cs[i2];
        d[2+i3] = -cs[1+i2];
        d[3+i3] = -cs[1+i2];
        d[4+i3] = -cs[2+i2];
        d[5+i3] = -cs[2+i2];
        d[6+i3] = cs[3+i2];
        d[7+i3] = cs[3+i2];
        break;

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      case 4: // +j +j +j +j
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        d[i3]   = -cs[i2];
        d[1+i3] = cs[i2];
        d[2+i3] = -cs[1+i2];
        d[3+i3] = cs[1+i2];
        d[4+i3] = -cs[2+i2];
        d[5+i3] = cs[2+i2];
        d[6+i3] = -cs[3+i2];
        d[7+i3] = cs[3+i2];
        break;

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      case 5: // +j -j +j -j
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        d[1+i3] = cs[i2];
        d[3+i3] = -cs[1+i2];
        d[5+i3] = cs[2+i2];
        d[7+i3] = -cs[3+i2];
        d[i3]   = -cs[i2];
        d[2+i3] = cs[1+i2];
        d[4+i3] = -cs[2+i2];
        d[6+i3] = cs[3+i2];
        break;

1234
      case 6: // +j +j -j -j
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        d[1+i3] = cs[i2];
        d[3+i3] = cs[1+i2];
        d[5+i3] = -cs[2+i2];
        d[7+i3] = -cs[3+i2];
        d[i3]   = -cs[i2];
        d[2+i3] = -cs[1+i2];
        d[4+i3] = cs[2+i2];
        d[6+i3] = cs[3+i2];
        break;

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      case 7: // +j -j -j +j
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        d[1+i3] = cs[i2];
        d[3+i3] = -cs[1+i2];
        d[5+i3] = -cs[2+i2];
        d[7+i3] = cs[3+i2];
        d[i3]   = -cs[i2];
        d[2+i3] = cs[1+i2];
        d[4+i3] = cs[2+i2];
        d[6+i3] = -cs[3+i2];
        break;

1256