/*******************************************************************************
OpenAirInterface
Copyright(c) 1999 - 2014 Eurecom
OpenAirInterface is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
OpenAirInterface is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with OpenAirInterface.The full GNU General Public License is
included in this distribution in the file called "COPYING". If not,
see <http://www.gnu.org/licenses/>.
Contact Information
OpenAirInterface Admin: openair_admin@eurecom.fr
OpenAirInterface Tech : openair_tech@eurecom.fr
OpenAirInterface Dev : openair4g-devel@eurecom.fr
Address : Eurecom, Campus SophiaTech, 450 Route des Chappes, CS 50193 - 06904 Biot Sophia Antipolis cedex, FRANCE
*******************************************************************************/
/*! \file PHY/LTE_TRANSPORT/pbch.c
* \brief Top-level routines for generating and decoding the PBCH/BCH physical/transport channel V8.6 2009-03
* \author R. Knopp, F. Kaltenberger
* \date 2011
* \version 0.1
* \company Eurecom
* \email: knopp@eurecom.fr,florian.kaltenberger.fr
* \note
* \warning
*/
#include <emmintrin.h>
#include <xmmintrin.h>
#ifdef __SSE3__
#include <pmmintrin.h>
#include <tmmintrin.h>
#endif
#include "PHY/defs.h"
#include "PHY/CODING/extern.h"
#include "PHY/CODING/lte_interleaver_inline.h"
#include "defs.h"
#include "extern.h"
#include "PHY/extern.h"
#ifdef PHY_ABSTRACTION
#include "SIMULATION/TOOLS/defs.h"
#endif
#ifndef __SSE3__
extern __m128i zero;
#define _mm_abs_epi16(xmmx) _mm_xor_si128((xmmx),_mm_cmpgt_epi16(zero,(xmmx)))
#define _mm_sign_epi16(xmmx,xmmy) _mm_xor_si128((xmmx),_mm_cmpgt_epi16(zero,(xmmy)))
#endif
//#define DEBUG_PBCH 1
//#define DEBUG_PBCH_ENCODING
//#define INTERFERENCE_MITIGATION 1
#ifdef OPENAIR2
#include "PHY_INTERFACE/defs.h"
#endif
#define PBCH_A 24
//uint8_t pbch_d[96+(3*(16+PBCH_A))], pbch_w[3*3*(16+PBCH_A)],pbch_e[1920]; //one bit per byte
int generate_pbch(LTE_eNB_PBCH *eNB_pbch,
mod_sym_t **txdataF,
int amp,
LTE_DL_FRAME_PARMS *frame_parms,
uint8_t *pbch_pdu,
uint8_t frame_mod4) {
int i, l;
uint32_t pbch_D,pbch_E;//,pbch_coded_bytes;
uint8_t pbch_a[PBCH_A>>3];
uint8_t RCC;
uint32_t nsymb = (frame_parms->Ncp==NORMAL) ? 14:12;
uint32_t pilots;
#ifdef INTERFERENCE_MITIGATION
uint32_t pilots_2;
#endif
uint32_t second_pilot = (frame_parms->Ncp==NORMAL) ? 4 : 3;
uint32_t jj=0;
uint32_t re_allocated=0;
uint32_t rb, re_offset, symbol_offset;
uint16_t amask=0;
pbch_D = 16+PBCH_A;
pbch_E = (frame_parms->Ncp==NORMAL) ? 1920 : 1728; //RE/RB * #RB * bits/RB (QPSK)
// pbch_E_bytes = pbch_coded_bits>>3;
if (frame_mod4==0) {
bzero(pbch_a,PBCH_A>>3);
bzero(eNB_pbch->pbch_e,pbch_E);
memset(eNB_pbch->pbch_d,LTE_NULL,96);
// Encode data
// CRC attachment
// crc = (uint16_t) (crc16(pbch_pdu, pbch_crc_bits-16) >> 16);
/*
// scramble crc with PBCH CRC mask (Table 5.3.1.1-1 of 3GPP 36.212-860)
switch (frame_parms->nb_antennas_tx_eNB) {
case 1:
crc = crc ^ (uint16_t) 0;
break;
case 2:
crc = crc ^ (uint16_t) 0xFFFF;
break;
case 4:
crc = crc ^ (uint16_t) 0xAAAA;
break;
default:
msg("[PBCH] Unknown number of TX antennas!\n");
break;
}
*/
// Fix byte endian of PBCH (bit 23 goes in first)
for (i=0;i<(PBCH_A>>3);i++)
pbch_a[(PBCH_A>>3)-i-1] = pbch_pdu[i];
// pbch_data[i] = ((char*) &crc)[0];
// pbch_data[i+1] = ((char*) &crc)[1];
#ifdef DEBUG_PBCH
for (i=0;i<(PBCH_A>>3);i++)
msg("[PBCH] pbch_data[%d] = %x\n",i,pbch_a[i]);
#endif
if (frame_parms->mode1_flag == 1)
amask = 0x0000;
else {
switch (frame_parms->nb_antennas_tx_eNB) {
case 1:
amask = 0x0000;
break;
case 2:
amask = 0xffff;
break;
case 4:
amask = 0x5555;
}
}
ccodelte_encode(PBCH_A,2,pbch_a,eNB_pbch->pbch_d+96,amask);
#ifdef DEBUG_PBCH_ENCODING
for (i=0;i<16+PBCH_A;i++)
msg("%d : (%d,%d,%d)\n",i,*(eNB_pbch->pbch_d+96+(3*i)),*(eNB_pbch->pbch_d+97+(3*i)),*(eNB_pbch->pbch_d+98+(3*i)));
#endif //DEBUG_PBCH_ENCODING
// Bit collection
/*
j2=0;
for (j=0;j<pbch_crc_bits*3+12;j++) {
if ((pbch_coded_data[j]&0x80) > 0) { // bit is to be transmitted
pbch_coded_data2[j2++] = pbch_coded_data[j]&1;
//Bit is repeated
if ((pbch_coded_data[j]&0x40)>0)
pbch_coded_data2[j2++] = pbch_coded_data[j]&1;
}
}
#ifdef DEBUG_PBCH
msg("[PBCH] rate matched bits=%d, pbch_coded_bits=%d, pbch_crc_bits=%d\n",j2,pbch_coded_bits,pbch_crc_bits);
#endif
#ifdef DEBUG_PBCH
#ifdef USER_MODE
write_output("pbch_encoded_output2.m","pbch_encoded_out2",
pbch_coded_data2,
pbch_coded_bits,
1,
4);
#endif //USER_MODE
#endif //DEBUG_PBCH
*/
#ifdef DEBUG_PBCH_ENCODING
msg("Doing PBCH interleaving for %d coded bits, e %p\n",pbch_D,eNB_pbch->pbch_e);
#endif
RCC = sub_block_interleaving_cc(pbch_D,eNB_pbch->pbch_d+96,eNB_pbch->pbch_w);
lte_rate_matching_cc(RCC,pbch_E,eNB_pbch->pbch_w,eNB_pbch->pbch_e);
#ifdef DEBUG_PBCH_ENCODING
msg("PBCH_e:\n");
for (i=0;i<pbch_E;i++)
msg("%d %d\n",i,*(eNB_pbch->pbch_e+i));
msg("\n");
#endif
#ifdef DEBUG_PBCH
#ifdef USER_MODE
if (frame_mod4==0) {
write_output("pbch_e.m","pbch_e",
eNB_pbch->pbch_e,
pbch_E,
1,
4);
for (i=0;i<16;i++)
printf("e[%d] %d\n",i,eNB_pbch->pbch_e[i]);
}
#endif //USER_MODE
#endif //DEBUG_PBCH
// scrambling
pbch_scrambling(frame_parms,
eNB_pbch->pbch_e,
pbch_E);
#ifdef DEBUG_PBCH
#ifdef USER_MODE
if (frame_mod4==0) {
write_output("pbch_e_s.m","pbch_e_s",
eNB_pbch->pbch_e,
pbch_E,
1,
4);
for (i=0;i<16;i++)
printf("e_s[%d] %d\n",i,eNB_pbch->pbch_e[i]);
}
#endif //USER_MODE
#endif //DEBUG_PBCH
} // frame_mod4==0
// modulation and mapping (slot 1, symbols 0..3)
for (l=(nsymb>>1);l<(nsymb>>1)+4;l++) {
pilots=0;
#ifdef INTERFERENCE_MITIGATION
pilots_2 = 0;
#endif
if ((l==0) || (l==(nsymb>>1))){
pilots=1;
#ifdef INTERFERENCE_MITIGATION
pilots_2=1;
#endif
}
if ((l==1) || (l==(nsymb>>1)+1)){
pilots=1;
}
if ((l==second_pilot)||(l==(second_pilot+(nsymb>>1)))) {
pilots=1;
}
#ifdef DEBUG_PBCH
msg("[PBCH] l=%d, pilots=%d\n",l,pilots);
#endif
#ifdef IFFT_FPGA
re_offset = frame_parms->N_RB_DL*12-3*12;
symbol_offset = frame_parms->N_RB_DL*12*l;
#else
re_offset = frame_parms->ofdm_symbol_size-3*12;
symbol_offset = frame_parms->ofdm_symbol_size*l;
#endif
for (rb=0;rb<6;rb++) {
#ifdef DEBUG_PBCH
msg("RB %d, jj %d, re_offset %d, symbol_offset %d, pilots %d, nushift %d\n",rb,jj,re_offset, symbol_offset, pilots,frame_parms->nushift);
#endif
allocate_REs_in_RB(txdataF,
&jj,
re_offset,
symbol_offset,
&eNB_pbch->pbch_e[frame_mod4*(pbch_E>>2)],
(frame_parms->mode1_flag == 1) ? SISO : ALAMOUTI,
0,
pilots,
2,
0,
#ifdef INTERFERENCE_MITIGATION
(pilots_2==1)?(amp/3):amp,
#else
amp,
#endif
NULL,
&re_allocated,
0,
0,
0,
1,
0,
frame_parms);
re_offset+=12; // go to next RB
// check if we crossed the symbol boundary and skip DC
#ifdef IFFT_FPGA
if (re_offset >= frame_parms->N_RB_DL*12)
re_offset = 0;
#else
if (re_offset >= frame_parms->ofdm_symbol_size)
re_offset=1;
#endif
}
// }
}
#ifdef DEBUG_PBCH
msg("[PBCH] txdataF=\n");
for (i=0;i<frame_parms->ofdm_symbol_size;i++)
msg("%d=>(%d,%d)\n",i,((short*)&txdataF[0][frame_parms->ofdm_symbol_size*(nsymb>>1)+i])[0],
((short*)&txdataF[0][frame_parms->ofdm_symbol_size*(nsymb>>1)+i])[1]);
#endif
return(0);
}
int32_t generate_pbch_emul(PHY_VARS_eNB *phy_vars_eNB,uint8_t *pbch_pdu) {
LOG_D(PHY,"[eNB %d] generate_pbch_emul \n",phy_vars_eNB->Mod_id);
eNB_transport_info[phy_vars_eNB->Mod_id][phy_vars_eNB->CC_id].cntl.pbch_flag=1;
// Copy PBCH payload
eNB_transport_info[phy_vars_eNB->Mod_id][phy_vars_eNB->CC_id].cntl.pbch_payload=*(uint32_t *)pbch_pdu;
return(0);
}
uint16_t pbch_extract(int **rxdataF,
int **dl_ch_estimates,
int **rxdataF_ext,
int **dl_ch_estimates_ext,
uint32_t symbol,
LTE_DL_FRAME_PARMS *frame_parms) {
uint16_t rb,nb_rb=6;
uint8_t i,j,aarx,aatx;
int *dl_ch0,*dl_ch0_ext,*rxF,*rxF_ext;
uint32_t nsymb = (frame_parms->Ncp==0) ? 7:6;
uint32_t symbol_mod = symbol % nsymb;
int rx_offset = frame_parms->ofdm_symbol_size-3*12;
int ch_offset = frame_parms->N_RB_DL*6-3*12;
int nushiftmod3 = frame_parms->nushift%3;
for (aarx=0;aarx<frame_parms->nb_antennas_rx;aarx++) {
/*
printf("extract_rbs (nushift %d): symbol_mod=%d, rx_offset=%d, ch_offset=%d\n",frame_parms->nushift,symbol_mod,
(rx_offset + (symbol*(frame_parms->ofdm_symbol_size)))*2,
LTE_CE_OFFSET+ch_offset+(symbol_mod*(frame_parms->ofdm_symbol_size)));
*/
#ifndef NEW_FFT
rxF = &rxdataF[aarx][(rx_offset + (symbol*(frame_parms->ofdm_symbol_size)))*2];
#else
rxF = &rxdataF[aarx][(rx_offset + (symbol*(frame_parms->ofdm_symbol_size)))];
#endif
rxF_ext = &rxdataF_ext[aarx][symbol_mod*(6*12)];
for (rb=0; rb<nb_rb; rb++) {
// skip DC carrier
if (rb==3) {
#ifndef NEW_FFT
rxF = &rxdataF[aarx][(1 + (symbol*(frame_parms->ofdm_symbol_size)))*2];
#else
rxF = &rxdataF[aarx][(1 + (symbol*(frame_parms->ofdm_symbol_size)))];
#endif
}
if ((symbol_mod==0) || (symbol_mod==1)) {
j=0;
for (i=0;i<12;i++) {
if ((i!=nushiftmod3) &&
(i!=(nushiftmod3+3)) &&
(i!=(nushiftmod3+6)) &&
(i!=(nushiftmod3+9))) {
#ifndef NEW_FFT
rxF_ext[j++]=rxF[i<<1];
#else
rxF_ext[j++]=rxF[i];
#endif
}
}
#ifndef NEW_FFT
rxF+=24;
#else
rxF+=12;
#endif
rxF_ext+=8;
}
else {
for (i=0;i<12;i++) {
#ifndef NEW_FFT
rxF_ext[i]=rxF[i<<1];
#else
rxF_ext[i]=rxF[i];
#endif
}
#ifndef NEW_FFT
rxF+=24;
#else
rxF+=12;
#endif
rxF_ext+=12;
}
}
for (aatx=0;aatx<4;aatx++) {//frame_parms->nb_antennas_tx_eNB;aatx++) {
dl_ch0 = &dl_ch_estimates[(aatx<<1)+aarx][LTE_CE_OFFSET+ch_offset+(symbol*(frame_parms->ofdm_symbol_size))];
dl_ch0_ext = &dl_ch_estimates_ext[(aatx<<1)+aarx][symbol_mod*(6*12)];
for (rb=0; rb<nb_rb; rb++) {
// skip DC carrier
// if (rb==3) dl_ch0++;
if (symbol_mod>1) {
memcpy(dl_ch0_ext,dl_ch0,12*sizeof(int));
dl_ch0+=12;
dl_ch0_ext+=12;
}
else {
j=0;
for (i=0;i<12;i++) {
if ((i!=nushiftmod3) &&
(i!=(nushiftmod3+3)) &&
(i!=(nushiftmod3+6)) &&
(i!=(nushiftmod3+9))){
// printf("PBCH extract i %d j %d => (%d,%d)\n",i,j,*(short *)&dl_ch0[i],*(1+(short*)&dl_ch0[i]));
dl_ch0_ext[j++]=dl_ch0[i];
}
}
dl_ch0+=12;
dl_ch0_ext+=8;
}
}
} //tx antenna loop
}
return(0);
}
__m128i avg128;
//compute average channel_level on each (TX,RX) antenna pair
int pbch_channel_level(int **dl_ch_estimates_ext,
LTE_DL_FRAME_PARMS *frame_parms,
uint32_t symbol) {
int16_t rb, nb_rb=6;
uint8_t aatx,aarx;
__m128i *dl_ch128;
int avg1=0,avg2=0;
uint32_t nsymb = (frame_parms->Ncp==0) ? 7:6;
uint32_t symbol_mod = symbol % nsymb;
for (aatx=0;aatx<4;aatx++) //frame_parms->nb_antennas_tx_eNB;aatx++)
for (aarx=0;aarx<frame_parms->nb_antennas_rx;aarx++) {
//clear average level
avg128 = _mm_xor_si128(avg128,avg128);
dl_ch128=(__m128i *)&dl_ch_estimates_ext[(aatx<<1)+aarx][symbol_mod*6*12];
for (rb=0;rb<nb_rb;rb++) {
avg128 = _mm_add_epi32(avg128,_mm_madd_epi16(dl_ch128[0],dl_ch128[0]));
avg128 = _mm_add_epi32(avg128,_mm_madd_epi16(dl_ch128[1],dl_ch128[1]));
avg128 = _mm_add_epi32(avg128,_mm_madd_epi16(dl_ch128[2],dl_ch128[2]));
dl_ch128+=3;
/*
if (rb==0) {
print_shorts("dl_ch128",&dl_ch128[0]);
print_shorts("dl_ch128",&dl_ch128[1]);
print_shorts("dl_ch128",&dl_ch128[2]);
}
*/
}
avg1 = (((int*)&avg128)[0] +
((int*)&avg128)[1] +
((int*)&avg128)[2] +
((int*)&avg128)[3])/(nb_rb*12);
if (avg1>avg2)
avg2 = avg1;
//msg("Channel level : %d, %d\n",avg1, avg2);
}
_mm_empty();
_m_empty();
return(avg2);
}
__m128i mmtmpP0,mmtmpP1,mmtmpP2,mmtmpP3;
void pbch_channel_compensation(int **rxdataF_ext,
int **dl_ch_estimates_ext,
int **rxdataF_comp,
LTE_DL_FRAME_PARMS *frame_parms,
uint8_t symbol,
uint8_t output_shift) {
uint16_t rb,nb_rb=6;
uint8_t aatx,aarx,symbol_mod;
__m128i *dl_ch128,*rxdataF128,*rxdataF_comp128;
symbol_mod = (symbol>=(7-frame_parms->Ncp)) ? symbol-(7-frame_parms->Ncp) : symbol;
for (aatx=0;aatx<4;aatx++) //frame_parms->nb_antennas_tx_eNB;aatx++)
for (aarx=0;aarx<frame_parms->nb_antennas_rx;aarx++) {
dl_ch128 = (__m128i *)&dl_ch_estimates_ext[(aatx<<1)+aarx][symbol_mod*6*12];
rxdataF128 = (__m128i *)&rxdataF_ext[aarx][symbol_mod*6*12];
rxdataF_comp128 = (__m128i *)&rxdataF_comp[(aatx<<1)+aarx][symbol_mod*6*12];
for (rb=0;rb<nb_rb;rb++) {
//printf("rb %d\n",rb);
// multiply by conjugated channel
mmtmpP0 = _mm_madd_epi16(dl_ch128[0],rxdataF128[0]);
// print_ints("re",&mmtmpP0);
// mmtmpP0 contains real part of 4 consecutive outputs (32-bit)
mmtmpP1 = _mm_shufflelo_epi16(dl_ch128[0],_MM_SHUFFLE(2,3,0,1));
mmtmpP1 = _mm_shufflehi_epi16(mmtmpP1,_MM_SHUFFLE(2,3,0,1));
mmtmpP1 = _mm_sign_epi16(mmtmpP1,*(__m128i*)&conjugate[0]);
// print_ints("im",&mmtmpP1);
mmtmpP1 = _mm_madd_epi16(mmtmpP1,rxdataF128[0]);
// mmtmpP1 contains imag part of 4 consecutive outputs (32-bit)
mmtmpP0 = _mm_srai_epi32(mmtmpP0,output_shift);
// print_ints("re(shift)",&mmtmpP0);
mmtmpP1 = _mm_srai_epi32(mmtmpP1,output_shift);
// print_ints("im(shift)",&mmtmpP1);
mmtmpP2 = _mm_unpacklo_epi32(mmtmpP0,mmtmpP1);
mmtmpP3 = _mm_unpackhi_epi32(mmtmpP0,mmtmpP1);
// print_ints("c0",&mmtmpP2);
// print_ints("c1",&mmtmpP3);
rxdataF_comp128[0] = _mm_packs_epi32(mmtmpP2,mmtmpP3);
// print_shorts("rx:",rxdataF128);
// print_shorts("ch:",dl_ch128);
// print_shorts("pack:",rxdataF_comp128);
// multiply by conjugated channel
mmtmpP0 = _mm_madd_epi16(dl_ch128[1],rxdataF128[1]);
// mmtmpP0 contains real part of 4 consecutive outputs (32-bit)
mmtmpP1 = _mm_shufflelo_epi16(dl_ch128[1],_MM_SHUFFLE(2,3,0,1));
mmtmpP1 = _mm_shufflehi_epi16(mmtmpP1,_MM_SHUFFLE(2,3,0,1));
mmtmpP1 = _mm_sign_epi16(mmtmpP1,*(__m128i*)&conjugate[0]);
mmtmpP1 = _mm_madd_epi16(mmtmpP1,rxdataF128[1]);
// mmtmpP1 contains imag part of 4 consecutive outputs (32-bit)
mmtmpP0 = _mm_srai_epi32(mmtmpP0,output_shift);
mmtmpP1 = _mm_srai_epi32(mmtmpP1,output_shift);
mmtmpP2 = _mm_unpacklo_epi32(mmtmpP0,mmtmpP1);
mmtmpP3 = _mm_unpackhi_epi32(mmtmpP0,mmtmpP1);
rxdataF_comp128[1] = _mm_packs_epi32(mmtmpP2,mmtmpP3);
// print_shorts("rx:",rxdataF128+1);
// print_shorts("ch:",dl_ch128+1);
// print_shorts("pack:",rxdataF_comp128+1);
if (symbol_mod>1) {
// multiply by conjugated channel
mmtmpP0 = _mm_madd_epi16(dl_ch128[2],rxdataF128[2]);
// mmtmpP0 contains real part of 4 consecutive outputs (32-bit)
mmtmpP1 = _mm_shufflelo_epi16(dl_ch128[2],_MM_SHUFFLE(2,3,0,1));
mmtmpP1 = _mm_shufflehi_epi16(mmtmpP1,_MM_SHUFFLE(2,3,0,1));
mmtmpP1 = _mm_sign_epi16(mmtmpP1,*(__m128i*)&conjugate[0]);
mmtmpP1 = _mm_madd_epi16(mmtmpP1,rxdataF128[2]);
// mmtmpP1 contains imag part of 4 consecutive outputs (32-bit)
mmtmpP0 = _mm_srai_epi32(mmtmpP0,output_shift);
mmtmpP1 = _mm_srai_epi32(mmtmpP1,output_shift);
mmtmpP2 = _mm_unpacklo_epi32(mmtmpP0,mmtmpP1);
mmtmpP3 = _mm_unpackhi_epi32(mmtmpP0,mmtmpP1);
rxdataF_comp128[2] = _mm_packs_epi32(mmtmpP2,mmtmpP3);
// print_shorts("rx:",rxdataF128+2);
// print_shorts("ch:",dl_ch128+2);
// print_shorts("pack:",rxdataF_comp128+2);
dl_ch128+=3;
rxdataF128+=3;
rxdataF_comp128+=3;
}
else {
dl_ch128+=2;
rxdataF128+=2;
rxdataF_comp128+=2;
}
}
}
_mm_empty();
_m_empty();
}
void pbch_detection_mrc(LTE_DL_FRAME_PARMS *frame_parms,
int **rxdataF_comp,
uint8_t symbol) {
uint8_t aatx, symbol_mod;
int i, nb_rb=6;
__m128i *rxdataF_comp128_0,*rxdataF_comp128_1;
symbol_mod = (symbol>=(7-frame_parms->Ncp)) ? symbol-(7-frame_parms->Ncp) : symbol;
if (frame_parms->nb_antennas_rx>1) {
for (aatx=0;aatx<4;aatx++) {//frame_parms->nb_antennas_tx_eNB;aatx++) {
rxdataF_comp128_0 = (__m128i *)&rxdataF_comp[(aatx<<1)][symbol_mod*6*12];
rxdataF_comp128_1 = (__m128i *)&rxdataF_comp[(aatx<<1)+1][symbol_mod*6*12];
// MRC on each re of rb, both on MF output and magnitude (for 16QAM/64QAM llr computation)
for (i=0;i<nb_rb*3;i++) {
rxdataF_comp128_0[i] = _mm_adds_epi16(_mm_srai_epi16(rxdataF_comp128_0[i],1),_mm_srai_epi16(rxdataF_comp128_1[i],1));
}
}
}
_mm_empty();
_m_empty();
}
void pbch_scrambling(LTE_DL_FRAME_PARMS *frame_parms,
uint8_t *pbch_e,
uint32_t length) {
int i;
uint8_t reset;
uint32_t x1, x2, s=0;
reset = 1;
// x1 is set in lte_gold_generic
x2 = frame_parms->Nid_cell; //this is c_init in 36.211 Sec 6.6.1
// msg("pbch_scrambling: Nid_cell = %d\n",x2);
for (i=0; i<length; i++) {
if ((i&0x1f)==0) {
s = lte_gold_generic(&x1, &x2, reset);
// printf("lte_gold[%d]=%x\n",i,s);
reset = 0;
}
pbch_e[i] = (pbch_e[i]&1) ^ ((s>>(i&0x1f))&1);
}
}
void pbch_unscrambling(LTE_DL_FRAME_PARMS *frame_parms,
int8_t* llr,
uint32_t length,
uint8_t frame_mod4) {
int i;
uint8_t reset;
uint32_t x1, x2, s=0;
reset = 1;
// x1 is set in first call to lte_gold_generic
x2 = frame_parms->Nid_cell; //this is c_init in 36.211 Sec 6.6.1
// msg("pbch_unscrambling: Nid_cell = %d\n",x2);
for (i=0; i<length; i++) {
if (i%32==0) {
s = lte_gold_generic(&x1, &x2, reset);
// printf("lte_gold[%d]=%x\n",i,s);
reset = 0;
}
// take the quarter of the PBCH that corresponds to this frame
if ((i>=(frame_mod4*(length>>2))) && (i<((1+frame_mod4)*(length>>2)))) {
// if (((s>>(i%32))&1)==1)
if (((s>>(i%32))&1)==0)
llr[i] = -llr[i];
}
}
}
void pbch_alamouti(LTE_DL_FRAME_PARMS *frame_parms,
int **rxdataF_comp,
uint8_t symbol) {
int16_t *rxF0,*rxF1;
// __m128i *ch_mag0,*ch_mag1,*ch_mag0b,*ch_mag1b;
uint8_t rb,re,symbol_mod;
int jj;
// printf("Doing alamouti\n");
symbol_mod = (symbol>=(7-frame_parms->Ncp)) ? symbol-(7-frame_parms->Ncp) : symbol;
jj = (symbol_mod*6*12);
rxF0 = (int16_t*)&rxdataF_comp[0][jj]; //tx antenna 0 h0*y
rxF1 = (int16_t*)&rxdataF_comp[2][jj]; //tx antenna 1 h1*y
for (rb=0;rb<6;rb++) {
for (re=0;re<12;re+=2) {
// Alamouti RX combining
rxF0[0] = rxF0[0] + rxF1[2];
rxF0[1] = rxF0[1] - rxF1[3];
rxF0[2] = rxF0[2] - rxF1[0];
rxF0[3] = rxF0[3] + rxF1[1];
rxF0+=4;
rxF1+=4;
}
}
_mm_empty();
_m_empty();
}
void pbch_quantize(int8_t *pbch_llr8,
int16_t *pbch_llr,
uint16_t len) {
uint16_t i;
for (i=0;i<len;i++) {
if (pbch_llr[i]>7)
pbch_llr8[i]=7;
else if (pbch_llr[i]<-8)
pbch_llr8[i]=-8;
else
pbch_llr8[i] = (char)(pbch_llr[i]);
}
}
static unsigned char dummy_w_rx[3*3*(16+PBCH_A)];
static int8_t pbch_w_rx[3*3*(16+PBCH_A)],pbch_d_rx[96+(3*(16+PBCH_A))];
uint16_t rx_pbch(LTE_UE_COMMON *lte_ue_common_vars,
LTE_UE_PBCH *lte_ue_pbch_vars,
LTE_DL_FRAME_PARMS *frame_parms,
uint8_t eNB_id,
MIMO_mode_t mimo_mode,
uint8_t frame_mod4) {
uint8_t log2_maxh;//,aatx,aarx;
int max_h=0;
int symbol,i;
uint32_t nsymb = (frame_parms->Ncp==0) ? 14:12;
uint16_t pbch_E;
uint8_t pbch_a[8];
uint8_t RCC;
int8_t *pbch_e_rx;
uint8_t *decoded_output = lte_ue_pbch_vars->decoded_output;
uint16_t crc;
// pbch_D = 16+PBCH_A;
pbch_E = (frame_parms->Ncp==0) ? 1920 : 1728; //RE/RB * #RB * bits/RB (QPSK)
pbch_e_rx = <e_ue_pbch_vars->llr[frame_mod4*(pbch_E>>2)];
#ifdef DEBUG_PBCH
msg("[PBCH] starting symbol loop (Ncp %d, frame_mod4 %d,mimo_mode %d\n",frame_parms->Ncp,frame_mod4,mimo_mode);
#endif
// clear LLR buffer
memset(lte_ue_pbch_vars->llr,0,pbch_E);
for (symbol=(nsymb>>1);symbol<(nsymb>>1)+4;symbol++) {
#ifdef DEBUG_PBCH
msg("[PBCH] starting extract\n");
#endif
pbch_extract(lte_ue_common_vars->rxdataF,
lte_ue_common_vars->dl_ch_estimates[eNB_id],
lte_ue_pbch_vars->rxdataF_ext,
lte_ue_pbch_vars->dl_ch_estimates_ext,
symbol,
frame_parms);
#ifdef DEBUG_PBCH
msg("[PHY] PBCH Symbol %d\n",symbol);
msg("[PHY] PBCH starting channel_level\n");
#endif
max_h = pbch_channel_level(lte_ue_pbch_vars->dl_ch_estimates_ext,
frame_parms,
symbol);
log2_maxh = 3+(log2_approx(max_h)/2);
#ifdef DEBUG_PBCH
msg("[PHY] PBCH log2_maxh = %d (%d)\n",log2_maxh,max_h);
#endif
pbch_channel_compensation(lte_ue_pbch_vars->rxdataF_ext,
lte_ue_pbch_vars->dl_ch_estimates_ext,
lte_ue_pbch_vars->rxdataF_comp,
frame_parms,
symbol,
log2_maxh); // log2_maxh+I0_shift
if (frame_parms->nb_antennas_rx > 1)
pbch_detection_mrc(frame_parms,
lte_ue_pbch_vars->rxdataF_comp,
symbol);
if (mimo_mode == ALAMOUTI) {
pbch_alamouti(frame_parms,lte_ue_pbch_vars->rxdataF_comp,symbol);
// msg("[PBCH][RX] Alamouti receiver not yet implemented!\n");
// return(-1);
}
else if ((mimo_mode != ANTCYCLING) && (mimo_mode != SISO)) {
msg("[PBCH][RX] Unsupported MIMO mode\n");
return(-1);
}
if (symbol>(nsymb>>1)+1) {
pbch_quantize(pbch_e_rx,
(short*)&(lte_ue_pbch_vars->rxdataF_comp[0][(symbol%(nsymb>>1))*72]),
144);
pbch_e_rx+=144;
}
else {
pbch_quantize(pbch_e_rx,
(short*)&(lte_ue_pbch_vars->rxdataF_comp[0][(symbol%(nsymb>>1))*72]),
96);
pbch_e_rx+=96;
}
}
pbch_e_rx = lte_ue_pbch_vars->llr;
//un-scrambling
#ifdef DEBUG_PBCH
msg("[PBCH] doing unscrambling\n");
#endif
pbch_unscrambling(frame_parms,
pbch_e_rx,
pbch_E,
frame_mod4);
//un-rate matching
#ifdef DEBUG_PBCH
msg("[PBCH] doing un-rate-matching\n");
#endif
memset(dummy_w_rx,0,3*3*(16+PBCH_A));
RCC = generate_dummy_w_cc(16+PBCH_A,
dummy_w_rx);
lte_rate_matching_cc_rx(RCC,pbch_E,pbch_w_rx,dummy_w_rx,pbch_e_rx);
sub_block_deinterleaving_cc((unsigned int)(PBCH_A+16),
&pbch_d_rx[96],
&pbch_w_rx[0]);
memset(pbch_a,0,((16+PBCH_A)>>3));
phy_viterbi_lte_sse2(pbch_d_rx+96,pbch_a,16+PBCH_A);
// Fix byte endian of PBCH (bit 23 goes in first)
for (i=0;i<(PBCH_A>>3);i++)
decoded_output[(PBCH_A>>3)-i-1] = pbch_a[i];
#ifdef DEBUG_PBCH
for (i=0;i<(PBCH_A>>3);i++)
msg("[PBCH] pbch_a[%d] = %x\n",i,decoded_output[i]);
#endif //DEBUG_PBCH
#ifdef DEBUG_PBCH
msg("PBCH CRC %x : %x\n",
crc16(pbch_a,PBCH_A),
((uint16_t)pbch_a[PBCH_A>>3]<<8)+pbch_a[(PBCH_A>>3)+1]);
#endif
crc = (crc16(pbch_a,PBCH_A)>>16) ^
(((uint16_t)pbch_a[PBCH_A>>3]<<8)+pbch_a[(PBCH_A>>3)+1]);
if (crc == 0x0000)
return(1);
else if (crc == 0xffff)
return(2);
else if (crc == 0x5555)
return(4);
else
return(-1);
}
#ifdef PHY_ABSTRACTION
uint16_t rx_pbch_emul(PHY_VARS_UE *phy_vars_ue,
uint8_t eNB_id,
uint8_t pbch_phase) {
double bler=0.0, x=0.0;
double sinr=0.0;
uint16_t nb_rb = phy_vars_ue->lte_frame_parms.N_RB_DL;
int16_t f;
uint8_t CC_id=phy_vars_ue->CC_id;
// compute effective sinr
// TODO: adapt this to varible bandwidth
for (f=(nb_rb*6-3*12);f<(nb_rb*6+3*12);f++) {
if (f!=0) //skip DC
sinr += pow(10, 0.1*(phy_vars_ue->sinr_dB[f]));
}
sinr = 10*log10(sinr/(6*12));
bler = pbch_bler(sinr);
LOG_D(PHY,"EMUL UE rx_pbch_emul: eNB_id %d, pbch_phase %d, sinr %f dB, bler %f \n",
eNB_id,
pbch_phase,
sinr,
bler);
if (pbch_phase == (phy_vars_ue->frame_rx % 4)) {
if (uniformrandom() >= bler) {
memcpy(phy_vars_ue->lte_ue_pbch_vars[eNB_id]->decoded_output,PHY_vars_eNB_g[eNB_id][CC_id]->pbch_pdu,PBCH_PDU_SIZE);
return(PHY_vars_eNB_g[eNB_id][CC_id]->lte_frame_parms.nb_antennas_tx_eNB);
}
else
return(-1);
}
else
return(-1);
}
#endif