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openairinterface5g/openair1/PHY/NR_UE_TRANSPORT/nr_pbch.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 1.0 (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
*/
/*! \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 "PHY/defs_nr_UE.h"
#include "PHY/CODING/coding_extern.h"
#include "PHY/phy_extern_nr_ue.h"
#include "PHY/sse_intrin.h"
#include "PHY/INIT/nr_phy_init.h"
#include "openair1/SCHED_NR_UE/defs.h"
#include <openair1/PHY/NR_UE_TRANSPORT/nr_transport_proto_ue.h>
#include <openair1/PHY/TOOLS/phy_scope_interface.h>
#include "openair1/PHY/NR_REFSIG/nr_refsig_common.h"
//#define DEBUG_PBCH
//#define DEBUG_PBCH_ENCODING
#define PBCH_A 24
#define PBCH_MAX_RE (PBCH_MAX_RE_PER_SYMBOL*4)
#define print_shorts(s,x) printf("%s : %d,%d,%d,%d,%d,%d,%d,%d\n",s,((int16_t*)x)[0],((int16_t*)x)[1],((int16_t*)x)[2],((int16_t*)x)[3],((int16_t*)x)[4],((int16_t*)x)[5],((int16_t*)x)[6],((int16_t*)x)[7])
static uint16_t nr_pbch_extract(uint32_t rxdataF_sz,
const c16_t rxdataF[][rxdataF_sz],
const int estimateSz,
struct complex16 dl_ch_estimates[][estimateSz],
struct complex16 rxdataF_ext[][PBCH_MAX_RE_PER_SYMBOL],
struct complex16 dl_ch_estimates_ext[][PBCH_MAX_RE_PER_SYMBOL],
uint32_t symbol,
uint32_t s_offset,
int ssb_start_subcarrier,
const NR_DL_FRAME_PARMS *frame_parms,
int nid)
{
uint16_t rb;
uint8_t i, j, aarx;
int nushiftmod4 = nid % 4;
AssertFatal(symbol>=1 && symbol<5,
"symbol %d illegal for PBCH extraction\n",
symbol);
for (aarx=0; aarx<frame_parms->nb_antennas_rx; aarx++) {
unsigned int rx_offset = frame_parms->first_carrier_offset + ssb_start_subcarrier;
rx_offset = (rx_offset)%(frame_parms->ofdm_symbol_size);
const struct complex16 *rxF = &rxdataF[aarx][(symbol + s_offset) * frame_parms->ofdm_symbol_size];
struct complex16 *rxF_ext = rxdataF_ext[aarx];
#ifdef DEBUG_PBCH
printf("extract_rbs (nushift %d): rx_offset=%d, symbol %u\n",
nushiftmod4,
(rx_offset + ((symbol+s_offset) * (frame_parms->ofdm_symbol_size))),
symbol);
int16_t *p = (int16_t *)rxF;
for (int i =0; i<8; i++) {
printf("rxF.r [%d]= %d rxF.i [%d]= %d\n", i, rxF[i].r, i, rxF[i].i);
printf("pbch extract rxF %d %d addr %p\n", p[2*i], p[2*i+1], &p[2*i]);
}
#endif
for (rb=0; rb<20; rb++) {
j=0;
if (symbol==1 || symbol==3) {
for (i=0; i<12; i++) {
if ((i!=nushiftmod4) &&
(i!=(nushiftmod4+4)) &&
(i!=(nushiftmod4+8))) {
rxF_ext[j]=rxF[rx_offset];
#ifdef DEBUG_PBCH
printf("rxF ext[%d] = (%d,%d) rxF [%u]= (%d,%d)\n",
(9 * rb) + j,
rxF_ext[j].r,
rxF_ext[j].i,
rx_offset,
rxF[rx_offset].r,
rxF[rx_offset].i);
#endif
j++;
}
rx_offset=(rx_offset+1)%(frame_parms->ofdm_symbol_size);
//rx_offset = (rx_offset >= frame_parms->ofdm_symbol_size) ? (rx_offset - frame_parms->ofdm_symbol_size + 1) : (rx_offset+1);
}
rxF_ext+=9;
} else { //symbol 2
if ((rb < 4) || (rb >15)) {
for (i=0; i<12; i++) {
if ((i!=nushiftmod4) &&
(i!=(nushiftmod4+4)) &&
(i!=(nushiftmod4+8))) {
rxF_ext[j]=rxF[rx_offset];
#ifdef DEBUG_PBCH
printf("rxF ext[%d] = (%d,%d) rxF [%u]= (%d,%d)\n",
(rb < 4) ? (9 * rb) + j : (9 * (rb - 12)) + j,
rxF_ext[j].r,
rxF_ext[j].i,
rx_offset,
rxF[rx_offset].r,
rxF[rx_offset].i);
#endif
j++;
}
rx_offset=(rx_offset+1)%(frame_parms->ofdm_symbol_size);
//rx_offset = (rx_offset >= frame_parms->ofdm_symbol_size) ? (rx_offset - frame_parms->ofdm_symbol_size + 1) : (rx_offset+1);
}
rxF_ext+=9;
} else { //rx_offset = (rx_offset >= frame_parms->ofdm_symbol_size) ? (rx_offset - frame_parms->ofdm_symbol_size + 12) : (rx_offset+12);
rx_offset = (rx_offset+12)%(frame_parms->ofdm_symbol_size);
}
}
}
struct complex16 *dl_ch0 = &dl_ch_estimates[aarx][((symbol+s_offset)*(frame_parms->ofdm_symbol_size))];
//printf("dl_ch0 addr %p\n",dl_ch0);
struct complex16 *dl_ch0_ext = dl_ch_estimates_ext[aarx];
for (rb=0; rb<20; rb++) {
j=0;
if (symbol==1 || symbol==3) {
for (i=0; i<12; i++) {
if ((i!=nushiftmod4) &&
(i!=(nushiftmod4+4)) &&
(i!=(nushiftmod4+8))) {
dl_ch0_ext[j]=dl_ch0[i];
#ifdef DEBUG_PBCH
if ((rb == 0) && (i < 2))
printf("dl ch0 ext[%d] = (%d,%d) dl_ch0 [%d]= (%d,%d)\n",
j,
dl_ch0_ext[j].r,
dl_ch0_ext[j].i,
i,
dl_ch0[j].r,
dl_ch0[j].i);
#endif
j++;
}
}
dl_ch0+=12;
dl_ch0_ext+=9;
} else {
if ((rb < 4) || (rb >15)) {
for (i=0; i<12; i++) {
if ((i!=nushiftmod4) &&
(i!=(nushiftmod4+4)) &&
(i!=(nushiftmod4+8))) {
dl_ch0_ext[j]=dl_ch0[i];
#ifdef DEBUG_PBCH
printf("dl ch0 ext[%d] = (%d,%d) dl_ch0 [%d]= (%d,%d)\n",
j,
dl_ch0_ext[j].r,
dl_ch0_ext[j].i,
i,
dl_ch0[j].r,
dl_ch0[j].i);
#endif
j++;
}
}
dl_ch0_ext+=9;
}
dl_ch0+=12;
}
}
}
return(0);
}
//__m128i avg128;
//compute average channel_level on each (TX,RX) antenna pair
int nr_pbch_channel_level(struct complex16 dl_ch_estimates_ext[][PBCH_MAX_RE_PER_SYMBOL],
const NR_DL_FRAME_PARMS *frame_parms,
int nb_re)
{
int16_t nb_rb=nb_re/12;
simde__m128i avg128;
simde__m128i *dl_ch128;
int avg1=0,avg2=0;
for (int aarx=0; aarx<frame_parms->nb_antennas_rx; aarx++) {
//clear average level
avg128 = simde_mm_setzero_si128();
dl_ch128=(simde__m128i *)dl_ch_estimates_ext[aarx];
for (int rb=0; rb<nb_rb; rb++) {
avg128 = simde_mm_add_epi32(avg128, simde_mm_madd_epi16(dl_ch128[0],dl_ch128[0]));
avg128 = simde_mm_add_epi32(avg128, simde_mm_madd_epi16(dl_ch128[1],dl_ch128[1]));
avg128 = simde_mm_add_epi32(avg128, simde_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]);
}*/
}
for (int i = 0; i < 4; i++)
avg1 += ((int *)&avg128)[i] / (nb_rb * 12);
if (avg1>avg2)
avg2 = avg1;
//LOG_I(PHY,"Channel level : %d, %d\n",avg1, avg2);
}
return(avg2);
}
void nr_pbch_channel_compensation(struct complex16 rxdataF_ext[][PBCH_MAX_RE_PER_SYMBOL],
struct complex16 dl_ch_estimates_ext[][PBCH_MAX_RE_PER_SYMBOL],
int nb_re,
struct complex16 rxdataF_comp[][PBCH_MAX_RE_PER_SYMBOL],
const NR_DL_FRAME_PARMS *frame_parms,
uint8_t output_shift)
{
for (int aarx=0; aarx<frame_parms->nb_antennas_rx; aarx++) {
simde__m128i *dl_ch128 = (simde__m128i *)dl_ch_estimates_ext[aarx];
simde__m128i *rxdataF128 = (simde__m128i *)rxdataF_ext[aarx];
simde__m128i *rxdataF_comp128 = (simde__m128i *)rxdataF_comp[aarx];
for (int re = 0; re < nb_re; re += 4) {
*rxdataF_comp128++ = mulByConjugate128(rxdataF128++, dl_ch128++, output_shift);
}
}
}
void nr_pbch_detection_mrc(NR_DL_FRAME_PARMS *frame_parms,
int **rxdataF_comp,
uint8_t symbol) {
uint8_t symbol_mod;
int i, nb_rb = 6;
simde__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) {
rxdataF_comp128_0 = (simde__m128i *)&rxdataF_comp[0][symbol_mod * 6 * 12];
rxdataF_comp128_1 = (simde__m128i *)&rxdataF_comp[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] =
simde_mm_adds_epi16(simde_mm_srai_epi16(rxdataF_comp128_0[i], 1), simde_mm_srai_epi16(rxdataF_comp128_1[i], 1));
}
}
simde_mm_empty();
simde_m_empty();
}
void nr_pbch_unscrambling(int16_t *demod_pbch_e,
uint16_t Nid,
uint8_t nushift,
uint16_t M,
uint16_t length,
uint8_t bitwise,
uint32_t unscrambling_mask,
uint32_t pbch_a_prime,
uint32_t *pbch_a_interleaved)
{
uint32_t *seq = gold_cache(Nid, (nushift * M + length + 31) / 32); // this is c_init
// The Gold sequence is shifted by nushift* M, so we skip (nushift*M /32) double words
int idxGold = (nushift * M + 31) / 32 - 1;
// Scrambling is now done with offset (nushift*M)%32
int offset = (nushift * M) & 0x1f;
uint8_t k = 0;
for (int i = 0; i < length; i++) {
if (bitwise) {
if (((k + offset) & 0x1f) == 0 && (!((unscrambling_mask >> i) & 1)))
idxGold++;
*pbch_a_interleaved ^= ((unscrambling_mask >> i) & 1)
? ((pbch_a_prime >> i) & 1) << i
: (((pbch_a_prime >> i) & 1) ^ ((seq[idxGold] >> ((k + offset) & 0x1f)) & 1)) << i;
k += (!((unscrambling_mask>>i)&1));
#ifdef DEBUG_PBCH_ENCODING
printf("i %d k %d offset %d (unscrambling_mask>>i)&1) %d s: %08x\t pbch_a_interleaved 0x%08x (!((unscrambling_mask>>i)&1)) %d\n", i, k, offset, (unscrambling_mask>>i)&1, s, *pbch_a_interleaved,
(!((unscrambling_mask>>i)&1)));
#endif
} else {
if (((i + offset) & 0x1f) == 0)
idxGold++;
if (seq[idxGold] & (1UL << ((i + offset) % 32)))
demod_pbch_e[i] = -demod_pbch_e[i];
#ifdef DEBUG_PBCH_ENCODING
if (i<8)
printf("s %d demod_pbch_e[i] %d\n", ((s>>((i+offset)&0x1f))&1), demod_pbch_e[i]);
#endif
}
}
}
void nr_pbch_quantize(int16_t *pbch_llr8, int16_t *pbch_llr, uint16_t len)
{
for (int i=0; i<len; i++) {
if (pbch_llr[i]>31)
pbch_llr8[i]=32;
else if (pbch_llr[i]<-31)
pbch_llr8[i]=-32;
else
pbch_llr8[i]=pbch_llr[i];
}
}
/*
unsigned char sign(int8_t x) {
return (unsigned char)x >> 7;
}
*/
const uint8_t pbch_deinterleaving_pattern[32] = {28, 0, 31, 30, 7, 29, 25, 27, 5, 8, 24, 9, 10, 11, 12, 13,
1, 4, 3, 14, 15, 16, 17, 2, 26, 18, 19, 20, 21, 22, 6, 23};
int nr_rx_pbch(PHY_VARS_NR_UE *ue,
const UE_nr_rxtx_proc_t *proc,
bool is_synchronized,
int estimateSz,
struct complex16 dl_ch_estimates[][estimateSz],
const NR_DL_FRAME_PARMS *frame_parms,
uint8_t i_ssb,
int ssb_start_subcarrier,
int Nid_cell,
fapiPbch_t *result,
int *half_frame_bit,
int *ssb_index,
int *ret_symbol_offset,
int rxdataFSize,
const struct complex16 rxdataF[][rxdataFSize])
{
int max_h=0;
int symbol;
uint8_t Lmax=frame_parms->Lmax;
int M = NR_POLAR_PBCH_E;
int nushift = (Lmax == 4) ? i_ssb & 3 : i_ssb & 7;
int16_t pbch_e_rx[960]= {0}; //Fixme: previous version erase only NR_POLAR_PBCH_E bytes
int16_t pbch_unClipped[960]= {0};
int pbch_e_rx_idx=0;
int symbol_offset=1;
if (is_synchronized)
symbol_offset=nr_get_ssb_start_symbol(frame_parms, i_ssb)%(frame_parms->symbols_per_slot);
else
symbol_offset=0;
#ifdef DEBUG_PBCH
//printf("address dataf %p",nr_ue_common_vars->rxdataF);
write_output("rxdataF0_pbch.m","rxF0pbch",
&rxdataF[0][(symbol_offset+1)*frame_parms->ofdm_symbol_size],frame_parms->ofdm_symbol_size*3,1,1);
#endif
// symbol refers to symbol within SSB. symbol_offset is the offset of the SSB wrt start of slot
double log2_maxh = 0;
for (symbol=1; symbol<4; symbol++) {
const uint16_t nb_re=symbol == 2 ? 72 : 180;
__attribute__ ((aligned(32))) struct complex16 rxdataF_ext[frame_parms->nb_antennas_rx][PBCH_MAX_RE_PER_SYMBOL];
__attribute__ ((aligned(32))) struct complex16 dl_ch_estimates_ext[frame_parms->nb_antennas_rx][PBCH_MAX_RE_PER_SYMBOL];
memset(dl_ch_estimates_ext,0, sizeof dl_ch_estimates_ext);
nr_pbch_extract(frame_parms->samples_per_slot_wCP,
rxdataF,
estimateSz,
dl_ch_estimates,
rxdataF_ext,
dl_ch_estimates_ext,
symbol,
symbol_offset,
ssb_start_subcarrier,
frame_parms,
Nid_cell);
#ifdef DEBUG_PBCH
LOG_I(PHY,"[PHY] PBCH Symbol %d ofdm size %d\n",symbol, frame_parms->ofdm_symbol_size);
LOG_I(PHY,"[PHY] PBCH starting channel_level\n");
#endif
if (symbol == 1) {
max_h = nr_pbch_channel_level(dl_ch_estimates_ext,
frame_parms,
nb_re);
log2_maxh = 3+(log2_approx(max_h)/2);
}
#ifdef DEBUG_PBCH
LOG_I(PHY,"[PHY] PBCH log2_maxh = %f (%d)\n", log2_maxh, max_h);
#endif
__attribute__ ((aligned(32))) struct complex16 rxdataF_comp[frame_parms->nb_antennas_rx][PBCH_MAX_RE_PER_SYMBOL];
nr_pbch_channel_compensation(rxdataF_ext,
dl_ch_estimates_ext,
nb_re,
rxdataF_comp,
frame_parms,
log2_maxh); // log2_maxh+I0_shift
/*if (frame_parms->nb_antennas_rx > 1)
pbch_detection_mrc(frame_parms,
rxdataF_comp,
symbol);*/
int nb=symbol==2 ? 144 : 360;
nr_pbch_quantize(pbch_e_rx+pbch_e_rx_idx,
(short *)rxdataF_comp[0],
nb);
memcpy(pbch_unClipped+pbch_e_rx_idx, rxdataF_comp[0], nb*sizeof(int16_t));
pbch_e_rx_idx+=nb;
}
// legacy code use int16, but it is complex16
if (ue) {
UEscopeCopy(ue, pbchRxdataF_comp, pbch_unClipped, sizeof(struct complex16), frame_parms->nb_antennas_rx, pbch_e_rx_idx / 2, 0);
UEscopeCopy(ue, pbchLlr, pbch_e_rx, sizeof(int16_t), frame_parms->nb_antennas_rx, pbch_e_rx_idx, 0);
}
#ifdef DEBUG_PBCH
for (int cnt = 0; cnt < 864 ; cnt++)
printf("pbch rx llr %d\n", *(pbch_e_rx + cnt));
#endif
// un-scrambling
uint32_t unscrambling_mask = (Lmax==64)?0x100006D:0x1000041;
uint32_t pbch_a_interleaved=0;
uint32_t pbch_a_prime=0;
nr_pbch_unscrambling(pbch_e_rx, Nid_cell, nushift, M, NR_POLAR_PBCH_E,
0, 0, pbch_a_prime, &pbch_a_interleaved);
//polar decoding de-rate matching
uint64_t tmp=0;
const uint32_t decoderState = polar_decoder_int16(pbch_e_rx,
(uint64_t *)&tmp,
0,
NR_POLAR_PBCH_MESSAGE_TYPE,
NR_POLAR_PBCH_PAYLOAD_BITS,
NR_POLAR_PBCH_AGGREGATION_LEVEL);
pbch_a_prime = tmp;
nr_downlink_indication_t dl_indication;
fapi_nr_rx_indication_t rx_ind = {0};
uint16_t number_pdus = 1;
if (decoderState) {
if (ue) { // decoding failed in synced state
nr_fill_dl_indication(&dl_indication, NULL, &rx_ind, proc, ue, NULL);
nr_fill_rx_indication(&rx_ind, FAPI_NR_RX_PDU_TYPE_SSB, ue, NULL, NULL, number_pdus, proc, NULL, NULL);
if (ue->if_inst && ue->if_inst->dl_indication)
ue->if_inst->dl_indication(&dl_indication);
}
return(decoderState);
}
// printf("polar decoder output 0x%08x\n",pbch_a_prime);
// Decoder reversal
pbch_a_prime = (uint32_t)reverse_bits(pbch_a_prime, NR_POLAR_PBCH_PAYLOAD_BITS);
//payload un-scrambling
M = (Lmax == 64)? (NR_POLAR_PBCH_PAYLOAD_BITS - 6) : (NR_POLAR_PBCH_PAYLOAD_BITS - 3);
nushift = ((pbch_a_prime>>24)&1) ^ (((pbch_a_prime>>6)&1)<<1);
pbch_a_interleaved=0;
nr_pbch_unscrambling(pbch_e_rx, Nid_cell, nushift, M, NR_POLAR_PBCH_PAYLOAD_BITS,
1, unscrambling_mask, pbch_a_prime, &pbch_a_interleaved);
//printf("nushift %d sfn 3rd %d 2nd %d", nushift,((pbch_a_prime>>6)&1), ((pbch_a_prime>>24)&1) );
//payload deinterleaving
//uint32_t in=0;
uint32_t out=0;
for (int i=0; i<32; i++) {
out |= ((pbch_a_interleaved>>i)&1)<<(pbch_deinterleaving_pattern[i]);
#ifdef DEBUG_PBCH
printf("i %d in 0x%08x out 0x%08x ilv %d (in>>i)&1) 0x%08x\n", i, pbch_a_interleaved, out, pbch_deinterleaving_pattern[i], (pbch_a_interleaved>>i)&1);
#endif
}
result->xtra_byte = (out>>24)&0xff;
const uint64_t payload = reverse_bits(out, NR_POLAR_PBCH_PAYLOAD_BITS);
for (int i=0; i<3; i++)
result->decoded_output[i] = (uint8_t)((payload>>((3-i)<<3))&0xff);
*half_frame_bit = (result->xtra_byte >> 4) & 0x01; // computing the half frame index from the extra byte
*ssb_index = i_ssb; // ssb index corresponds to i_ssb for Lmax = 4,8
if (Lmax == 64) { // for Lmax = 64 ssb index 4th,5th and 6th bits are in extra byte
for (int i=0; i<3; i++)
*ssb_index += (((result->xtra_byte >> (7 - i)) & 0x01) << (3 + i));
}
*ret_symbol_offset = nr_get_ssb_start_symbol(frame_parms, *ssb_index);
if (*half_frame_bit)
*ret_symbol_offset += (frame_parms->slots_per_frame >> 1) * frame_parms->symbols_per_slot;
#ifdef DEBUG_PBCH
printf("xtra_byte %x payload %x\n", result->xtra_byte, payload);
for (int i=0; i<(NR_POLAR_PBCH_PAYLOAD_BITS>>3); i++) {
// printf("unscrambling pbch_a[%d] = %x \n", i,pbch_a[i]);
printf("[PBCH] decoder payload[%d] = %x\n",i,result->decoded_output[i]);
}
#endif
if (ue) {
nr_fill_dl_indication(&dl_indication, NULL, &rx_ind, proc, ue, NULL);
nr_fill_rx_indication(&rx_ind, FAPI_NR_RX_PDU_TYPE_SSB, ue, NULL, NULL, number_pdus, proc, (void *)result, NULL);
if (ue->if_inst && ue->if_inst->dl_indication)
ue->if_inst->dl_indication(&dl_indication);
}
return 0;
}
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