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openairinterface5g/openair1/PHY/LTE_TRANSPORT/phich.c
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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 1.1 (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
*/
/*! \file PHY/LTE_TRANSPORT/phich.c
* \brief Top-level routines for generating 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_eNB.h"
#include "PHY/impl_defs_top.h"
#include "T.h"
#include "PHY/LTE_REFSIG/lte_refsig.h"
#include "transport_common_proto.h"
//#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];
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
// This routine generates the PHICH
void generate_phich(LTE_DL_FRAME_PARMS *frame_parms,
int16_t amp,
uint8_t nseq_PHICH,
uint8_t ngroup_PHICH,
uint8_t HI,
uint8_t subframe,
int32_t **y)
{
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));
const int nushift=frame_parms->nushift;
if (frame_parms->nb_antenna_ports_eNB==1)
gain_lin_QPSK = (int16_t)(((int32_t)amp*ONE_OVER_SQRT2_Q15)>>15);
else
gain_lin_QPSK = amp/2;
//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;
// c = (1-(2*HI))*SSS_AMP;
// x1 is set in lte_gold_generic
x2 = (((subframe+1)*((frame_parms->Nid_cell<<1)+1))<<9) + frame_parms->Nid_cell;
s = lte_gold_generic(&x1, &x2, reset);
// compute scrambling sequence
for (i=0; i<12; i++) {
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)
for (i=0,i2=0,i3=0; i<3; i++,i2+=4,i3+=8) {
switch (nseq_PHICH) {
case 0: // +1 +1 +1 +1
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;
case 1: // +1 -1 +1 -1
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;
case 2: // +1 +1 -1 -1
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;
case 3: // +1 -1 -1 +1
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;
case 4: // +j +j +j +j
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;
case 5: // +j -j +j -j
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;
case 6: // +j +j -j -j
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;
case 7: // +j -j -j +j
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;
default:
AssertFatal(1==0,"phich_coding.c: Illegal PHICH Number\n");
} // nseq_PHICH
}
#ifdef DEBUG_PHICH
LOG_D(PHY,"[PUSCH 0]PHICH d = ");
for (i=0; i<24; i+=2)
LOG_D(PHY,"(%d,%d)",d[i],d[i+1]);
LOG_D(PHY,"\n");
#endif
// modulation here
if (frame_parms->nb_antenna_ports_eNB != 1) {
// do Alamouti precoding here
// 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)
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[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];
for (i=0,j=0,m=0; i<6; i++,j+=2) {
if ((i!=(nushift))&&(i!=((nushift+3)%6))) {
y0[j] += y0_16[m];
y1[j] += y1_16[m++];
y0[j+1] += y0_16[m];
y1[j+1] += y1_16[m++];
}
}
// 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)
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[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];
for (i=0,j=0,m=0; i<6; i++,j+=2) {
if ((i!=(nushift))&&(i!=((nushift+3)%6))) {
y0[j] += y0_16[m];
y1[j] += y1_16[m++];
y0[j+1] += y0_16[m];
y1[j+1] += y1_16[m++];
}
}
// 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)
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];
for (i=0,j=0,m=0; i<6; i++,j+=2) {
if ((i!=(nushift))&&(i!=((nushift+3)%6))) {
y0[j] += y0_16[m];
y1[j] += y1_16[m++];
y0[j+1] += y0_16[m];
y1[j+1] += y1_16[m++];
}
}
} // nb_antenna_ports_eNB
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)
re_offset -= (frame_parms->ofdm_symbol_size-1);
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;
for (i=0,j=0,m=0; i<6; i++,j+=2) {
if ((i!=(nushift))&&(i!=((nushift+3)%6))) {
y0[j] += y0_16[m++];
y0[j+1] += y0_16[m++];
}
}
// 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)
re_offset -= (frame_parms->ofdm_symbol_size-1);
y0 = (int16_t*)&y[0][re_offset+subframe_offset];
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;
for (i=0,j=0,m=0; i<6; i++,j+=2) {
if ((i!=(nushift))&&(i!=((nushift+3)%6))) {
y0[j] += y0_16[m++];
y0[j+1] += y0_16[m++];
}
}
// 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)
re_offset -= (frame_parms->ofdm_symbol_size-1);
y0 = (int16_t*)&y[0][re_offset+subframe_offset];
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;
for (i=0,j=0,m=0; i<6; i++,j+=2) {
if ((i!=(nushift))&&(i!=((nushift+3)%6))) {
y0[j] += y0_16[m++];
y0[j+1] += y0_16[m++];
}
}
/*
for (i=0;i<512;i++)
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]);
*/
} // nb_antenna_ports_eNB
} else { // extended prefix
// 6 output symbols
if ((ngroup_PHICH & 1) == 1)
dp = &d[4];
else
dp = d;
switch (nseq_PHICH) {
case 0: // +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;
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;
case 2: // +j +j
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;
case 3: // +j -j
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;
default:
AssertFatal(1==0,"phich_coding.c: Illegal PHICH Number\n");
}
if (frame_parms->nb_antenna_ports_eNB != 1) {
// do Alamouti precoding here
// 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)
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[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];
for (i=0,j=0,m=0; i<6; i++,j+=2) {
if ((i!=(nushift))&&(i!=((nushift+3)%6))) {
y0[j] += y0_16[m];
y1[j] += y1_16[m++];
y0[j+1] += y0_16[m];
y1[j+1] += y1_16[m++];
}
}
// Symbol 1
re_offset = frame_parms->first_carrier_offset + (frame_parms->phich_reg[ngroup_PHICH][1]<<2);
if (re_offset > frame_parms->ofdm_symbol_size)
re_offset -= (frame_parms->ofdm_symbol_size-1);
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];
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++];
}
// Symbol 2
re_offset = frame_parms->first_carrier_offset + (frame_parms->phich_reg[ngroup_PHICH][2]<<2);
if (re_offset > frame_parms->ofdm_symbol_size)
re_offset -= (frame_parms->ofdm_symbol_size-1);
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];
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++];
}
} else {
// 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)
re_offset -= (frame_parms->ofdm_symbol_size-1);
y0 = (int16_t*)&y[0][re_offset+subframe_offset];
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;
for (i=0,j=0,m=0; i<6; i++,j+=2) {
if ((i!=(nushift))&&(i!=((nushift+3)%6))) {
y0[j] += y0_16[m++];
y0[j+1] += y0_16[m++];
}
}
// Symbol 1
re_offset = frame_parms->first_carrier_offset + (frame_parms->phich_reg[ngroup_PHICH][1]<<2);
if (re_offset > frame_parms->ofdm_symbol_size)
re_offset -= (frame_parms->ofdm_symbol_size-1);
re_offset += (frame_parms->ofdm_symbol_size);
y0 = (int16_t*)&y[0][re_offset+subframe_offset];
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;
for (i=0,j=0,m=0; i<4; i++,j+=2) {
y0[j] += y0_16[m++];
y0[j+1] += y0_16[m++];
}
// Symbol 2
re_offset = frame_parms->first_carrier_offset + (frame_parms->phich_reg[ngroup_PHICH][2]<<2);
if (re_offset > frame_parms->ofdm_symbol_size)
re_offset -= (frame_parms->ofdm_symbol_size-1);
re_offset += (frame_parms->ofdm_symbol_size<<1);
y0 = (int16_t*)&y[0][re_offset+subframe_offset];
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;
for (i=0,j=0,m=0; i<4; i++) {
y0[j] += y0_16[m++];
y0[j+1] += y0_16[m++];
}
} // nb_antenna_ports_eNB
} // normal/extended prefix
}
void generate_phich_top(PHY_VARS_eNB *eNB,
L1_rxtx_proc_t *proc,
int16_t amp)
{
LTE_DL_FRAME_PARMS *frame_parms=&eNB->frame_parms;
int32_t **txdataF = eNB->common_vars.txdataF;
uint8_t Ngroup_PHICH,ngroup_PHICH,nseq_PHICH;
uint8_t NSF_PHICH = 4;
uint8_t pusch_subframe=-1;
uint8_t i;
uint8_t harq_pid = 0;
int subframe = proc->subframe_tx;
phich_config_t *phich;
// 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;
if (((frame_parms->phich_config_common.phich_resource*frame_parms->N_RB_DL)%48) > 0)
Ngroup_PHICH++;
if (frame_parms->Ncp == 1)
NSF_PHICH = 2;
if (eNB->phich_vars[subframe&1].num_hi > 0) {
pusch_subframe = phich_subframe2_pusch_subframe(frame_parms,subframe);
}
for (i=0; i<eNB->phich_vars[subframe&1].num_hi; i++) {
phich = &eNB->phich_vars[subframe&1].config[i];
ngroup_PHICH = (phich->first_rb +
phich->n_DMRS)%Ngroup_PHICH;
if ((frame_parms->tdd_config == 0) && (frame_parms->frame_type == TDD) ) {
if ((pusch_subframe == 4) || (pusch_subframe == 9))
ngroup_PHICH += Ngroup_PHICH;
}
nseq_PHICH = ((phich->first_rb/Ngroup_PHICH) +
phich->n_DMRS)%(2*NSF_PHICH);
harq_pid = subframe2harq_pid(frame_parms,phich_frame2_pusch_frame(frame_parms,proc->frame_tx,subframe),pusch_subframe);
if (harq_pid == 255) {
LOG_E(PHY,"FATAL ERROR: illegal harq_pid, returning\n");
return;
}
LOG_D(PHY,"[eNB %d][PUSCH %d] Frame %d subframe %d Generating PHICH, AMP %d ngroup_PHICH %d/%d, nseq_PHICH %d : HI %d, first_rb %d)\n",
eNB->Mod_id,harq_pid,proc->frame_tx,
subframe,amp,ngroup_PHICH,Ngroup_PHICH,nseq_PHICH,
phich->hi,
phich->first_rb);
T(T_ENB_PHY_PHICH, T_INT(eNB->Mod_id), T_INT(proc->frame_tx), T_INT(subframe),
T_INT(-1 /* TODO: rnti */),
T_INT(harq_pid),
T_INT(Ngroup_PHICH), T_INT(NSF_PHICH),
T_INT(ngroup_PHICH), T_INT(nseq_PHICH),
T_INT(phich->hi),
T_INT(phich->first_rb),
T_INT(phich->n_DMRS));
generate_phich(frame_parms,
amp,//amp*2,
nseq_PHICH,
ngroup_PHICH,
phich->hi,
subframe,
txdataF);
}// for (i=0; i<eNB->phich_vars[subframe&1].num_hi; i++) {
eNB->phich_vars[subframe&1].num_hi=0;
}
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