phich.c 48.2 KB
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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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  }
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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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  if (frame_parms->frame_type == FDD) {
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    return((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!
    return(frame);
  }
}

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uint8_t phich_subframe2_pusch_subframe(LTE_DL_FRAME_PARMS *frame_parms,uint8_t subframe)
{
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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)
      return(3);
    else if (subframe == 5) {
      return (8);
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    } else if (subframe == 6)
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      return (2);
    else if (subframe == 1)
      return (7);
    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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      return(0);
    }
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    break;
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  case 1:
    if (subframe == 6)
      return(2);
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    else if (subframe == 9)
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      return (3);
    else if (subframe == 1)
      return (7);
    else if (subframe == 4)
      return (8);
    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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      return(0);
    }
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    break;
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  case 2:
    if (subframe == 8)
      return(2);
    else if (subframe == 3)
      return (7);
    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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      return(0);
    }
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    break;
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  case 3:
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    if ( (subframe == 8) || (subframe == 9) ) {
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      return(subframe-6);
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    } else if (subframe==0)
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      return(4);
    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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      return(0);
    }
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    break;
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  case 4:
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    if ( (subframe == 8) || (subframe == 9) ) {
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      return(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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      return(0);
    }
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    break;

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  case 5:
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    if (subframe == 8) {
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      return(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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      return(0);
    }
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    break;

  case 6:
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    if (subframe == 6) {
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      return(2);
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    } else if (subframe == 9) {
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      return(3);
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    } else if (subframe == 0) {
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      return(4);
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    } else if (subframe == 1) {
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      return(7);
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    } else if (subframe == 5) {
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      return(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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      return(0);
    }
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    break;
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  }
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  return(0);
}

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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
  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
      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]);
      //#endif
    } 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;

519
      case 6: // +j +j -j -j
520
521
522
523
524
525
526
527
528
529
        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;

530
      case 7: // +j -j -j +j
531
532
533
534
535
536
537
538
539
540
        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;

541
      default:
542
        LOG_E(PHY,"phich_coding.c: Illegal PHICH Number\n");
543
544
      } // nseq_PHICH
    }
545

546
547
#ifdef DEBUG_PHICH
    LOG_D(PHY,"[PUSCH 0]PHICH d = ");
548
549

    for (i=0; i<24; i+=2)
550
      LOG_D(PHY,"(%d,%d)",d[i],d[i+1]);
551

552
553
    LOG_D(PHY,"\n");
#endif
554
555

    // modulation here
556
557
    if (frame_parms->mode1_flag == 0) {
      // do Alamouti precoding here
558

559
560
561
562
      // 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)
563
        re_offset -= (frame_parms->ofdm_symbol_size-1);
564
565
566

      y0 = (int16_t*)&y[0][re_offset+subframe_offset];
      y1 = (int16_t*)&y[1][re_offset+subframe_offset];
567

568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
      // 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];

592
593
594
595
596
597
598
      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++];
        }
599
      }
600

601
602
603
604
      // 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)
605
        re_offset -= (frame_parms->ofdm_symbol_size-1);
606
607
608

      y0 = (int16_t*)&y[0][re_offset+subframe_offset];
      y1 = (int16_t*)&y[1][re_offset+subframe_offset];
609

610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
      // 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];

634
635
636
637
638
639
640
      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++];
        }
641
642
643
644
645
646
      }

      // 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)
647
        re_offset -= (frame_parms->ofdm_symbol_size-1);
648
649
650

      y0 = (int16_t*)&y[0][re_offset+subframe_offset];
      y1 = (int16_t*)&y[1][re_offset+subframe_offset];
651

652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
      // 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];

676
677
678
679
680
681
682
      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++];
        }
683
684
685
686
687
688
689
690
691
692
      }

    } // 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)
693
        re_offset -= (frame_parms->ofdm_symbol_size-1);
694
695
696
697
698
699
700
701
702
703
704
705
706

      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;

707
708
709
710
711
      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++];
        }
712
      }
713

714
715
716
717
718
      // 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)
719
        re_offset -= (frame_parms->ofdm_symbol_size-1);
720
721

      y0 = (int16_t*)&y[0][re_offset+subframe_offset];
722

723
724
725
726
727
728
729
730
731
      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;

732
733
734
735
736
      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++];
        }
737
738
739
740
741
742
743
      }

      // 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)
744
745
        re_offset -= (frame_parms->ofdm_symbol_size-1);

746
      y0 = (int16_t*)&y[0][re_offset+subframe_offset];
747

748
749
750
751
752
753
754
755
756
      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;

757
758
759
760
761
      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++];
        }
762
      }
763

764
765
      /*
      for (i=0;i<512;i++)
766
      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]);
767
768
      */
    } // mode1_flag
769
770
  } else { // extended prefix

771
772
773
    // 6 output symbols
    if ((ngroup_PHICH & 1) == 1)
      dp = &d[4];
774
    else
775
776
777
      dp = d;

    switch (nseq_PHICH) {
778
    case 0: // +1 +1
779
780
781
782
783
784
785
786
787
788
789
790
791
      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;
792

793
794
795
796
797
798
799
800
801
802
803
804
805
806
    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;
807
808

    case 2: // +j +j
809
810
811
812
813
814
815
816
817
818
819
820
      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];
821

822
      break;
823
824

    case 3: // +j -j
825
826
827
828
829
830
831
832
833
834
835
836
837
      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;
838

839
840
841
    default:
      LOG_E(PHY,"phich_coding.c: Illegal PHICH Number\n");
    }
842
843
844



845
846
847
848
    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);
849

850
      if (re_offset > frame_parms->ofdm_symbol_size)
851
        re_offset -= (frame_parms->ofdm_symbol_size-1);
852
853
854

      y0 = (int16_t*)&y[0][re_offset+subframe_offset];
      y1 = (int16_t*)&y[1][re_offset+subframe_offset];
855

856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
      // 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];

880
881
882
883
884
885
886
      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++];
        }
887
888
889
890
      }

      // Symbol 1
      re_offset = frame_parms->first_carrier_offset + (frame_parms->phich_reg[ngroup_PHICH][1]<<2);
891

892
      if (re_offset > frame_parms->ofdm_symbol_size)
893
894
        re_offset -= (frame_parms->ofdm_symbol_size-1);

895
896
897
898
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
      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];

924
925
926
927
928
      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++];
929
930
931
932
      }

      // Symbol 2
      re_offset = frame_parms->first_carrier_offset +  (frame_parms->phich_reg[ngroup_PHICH][2]<<2);
933

934
      if (re_offset > frame_parms->ofdm_symbol_size)
935
936
        re_offset -= (frame_parms->ofdm_symbol_size-1);

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
      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];

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      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++];
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      }
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    } else {
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      // Symbol 0
      re_offset = frame_parms->first_carrier_offset + (frame_parms->phich_reg[ngroup_PHICH][0]*6);
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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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      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;
  LTE_UE_PDCCH **pdcch_vars = ue->pdcch_vars;
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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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  // 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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    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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    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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