317 lines
11 KiB
C
317 lines
11 KiB
C
/*
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* Licensed to the OpenAirInterface (OAI) Software Alliance under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The OpenAirInterface Software Alliance licenses this file to You under
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* the OAI Public License, Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.openairinterface.org/?page_id=698
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*-------------------------------------------------------------------------------
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* For more information about the OpenAirInterface (OAI) Software Alliance:
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* contact@openairinterface.org
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*/
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/*! \file PHY/NR_TRANSPORT/dlsch_decoding.c
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* \brief Top-level routines for transmission of the PDSCH 38211 v 15.2.0
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* \author Guy De Souza
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* \date 2018
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* \version 0.1
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* \company Eurecom
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* \email: desouza@eurecom.fr
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* \note
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* \warning
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*/
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#include "nr_dlsch.h"
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#include "nr_dci.h"
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#include "nr_sch_dmrs.h"
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#include "PHY/MODULATION/nr_modulation.h"
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//#define DEBUG_DLSCH
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//#define DEBUG_DLSCH_MAPPING
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void nr_pdsch_codeword_scrambling(uint8_t *in,
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uint32_t size,
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uint8_t q,
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uint32_t Nid,
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uint32_t n_RNTI,
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uint32_t* out) {
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uint8_t reset, b_idx;
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uint32_t x1, x2, s=0;
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reset = 1;
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x2 = (n_RNTI<<15) + (q<<14) + Nid;
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for (int i=0; i<size; i++) {
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b_idx = i&0x1f;
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if (b_idx==0) {
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s = lte_gold_generic(&x1, &x2, reset);
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reset = 0;
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if (i)
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out++;
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}
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*out ^= (((in[i])&1) ^ ((s>>b_idx)&1))<<b_idx;
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//printf("i %d b_idx %d in %d s 0x%08x out 0x%08x\n", i, b_idx, in[i], s, *out);
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}
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}
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void nr_pdsch_codeword_scrambling_optim(uint8_t *in,
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uint32_t size,
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uint8_t q,
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uint32_t Nid,
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uint32_t n_RNTI,
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uint32_t* out) {
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uint32_t x1, x2, s=0,in32;
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x2 = (n_RNTI<<15) + (q<<14) + Nid;
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s=lte_gold_generic(&x1, &x2, 1);
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#if defined(__AVX2__)
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for (int i=0; i<((size>>5)+((size&0x1f) > 0 ? 1 : 0)); i++) {
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in32=_mm256_movemask_epi8(_mm256_slli_epi16(((__m256i*)in)[i],7));
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out[i]=(in32^s);
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// printf("in[%d] %x => %x\n",i,in32,out[i]);
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s=lte_gold_generic(&x1, &x2, 0);
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}
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#elif defined(__SSE4__)
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_m128i *in128;
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for (int i=0; i<((size>>5)+((size&0x1f) > 0 ? 1 : 0)); i++) {
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in128=&((__m128i*)in)[i<<1];
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((uint16_t*)&in32)[0] = _mm128_movemask_epi8(_mm256_slli_epi16(in128[0],7));
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((uint16_t*)&in32)[1] = _mm128_movemask_epi8(_mm256_slli_epi16(in128[1],7));
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out[i]=(in32^s);
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s=lte_gold_generic(&x1, &x2, 0);
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}
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//#elsif defined(__arm__) || defined(__aarch64)
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#else
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nr_pdsch_codeword_scrambling(in,
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size,
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q,
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Nid,
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n_RNTI,
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out);
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#endif
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}
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uint8_t nr_generate_pdsch(NR_gNB_DLSCH_t *dlsch,
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uint32_t ***pdsch_dmrs,
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int32_t** txdataF,
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int16_t amp,
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int frame,
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uint8_t slot,
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NR_DL_FRAME_PARMS *frame_parms,
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int xOverhead,
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time_stats_t *dlsch_encoding_stats,
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time_stats_t *dlsch_scrambling_stats,
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time_stats_t *dlsch_modulation_stats,
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time_stats_t *tinput,
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time_stats_t *tprep,
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time_stats_t *tparity,
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time_stats_t *toutput,
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time_stats_t *dlsch_rate_matching_stats,
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time_stats_t *dlsch_interleaving_stats,
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time_stats_t *dlsch_segmentation_stats) {
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int harq_pid = 0;
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NR_DL_gNB_HARQ_t *harq = dlsch->harq_processes[harq_pid];
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nfapi_nr_dl_tti_pdsch_pdu_rel15_t *rel15 = &harq->pdsch_pdu.pdsch_pdu_rel15;
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uint32_t scrambled_output[NR_MAX_NB_CODEWORDS][NR_MAX_PDSCH_ENCODED_LENGTH>>5];
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int16_t **mod_symbs = (int16_t**)dlsch->mod_symbs;
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int16_t **tx_layers = (int16_t**)dlsch->txdataF;
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int8_t Wf[2], Wt[2], l0, l_prime[2], delta;
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uint8_t dmrs_Type = rel15->dmrsConfigType;
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int nb_re_dmrs = (dmrs_Type== NFAPI_NR_DMRS_TYPE1) ? 6:4;
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uint16_t n_dmrs = ((rel15->rbSize+rel15->rbStart)*nb_re_dmrs)<<1;
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int16_t mod_dmrs[n_dmrs<<1];
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uint16_t nb_re = ((12*rel15->NrOfSymbols)-nb_re_dmrs-xOverhead)*rel15->rbSize*rel15->NrOfCodewords;
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uint8_t Qm = rel15->qamModOrder[0];
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uint32_t encoded_length = nb_re*Qm;
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/// CRC, coding, interleaving and rate matching
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AssertFatal(harq->pdu!=NULL,"harq->pdu is null\n");
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start_meas(dlsch_encoding_stats);
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nr_dlsch_encoding(harq->pdu, frame, slot, dlsch, frame_parms,tinput,tprep,tparity,toutput,
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dlsch_rate_matching_stats,
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dlsch_interleaving_stats,
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dlsch_segmentation_stats);
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stop_meas(dlsch_encoding_stats);
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#ifdef DEBUG_DLSCH
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printf("PDSCH encoding:\nPayload:\n");
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for (int i=0; i<harq->B>>7; i++) {
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for (int j=0; j<16; j++)
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printf("0x%02x\t", harq->pdu[(i<<4)+j]);
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printf("\n");
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}
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printf("\nEncoded payload:\n");
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for (int i=0; i<encoded_length>>3; i++) {
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for (int j=0; j<8; j++)
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printf("%d", harq->f[(i<<3)+j]);
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printf("\t");
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}
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printf("\n");
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#endif
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/// scrambling
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start_meas(dlsch_scrambling_stats);
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for (int q=0; q<rel15->NrOfCodewords; q++)
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memset((void*)scrambled_output[q], 0, (encoded_length>>5)*sizeof(uint32_t));
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for (int q=0; q<rel15->NrOfCodewords; q++)
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nr_pdsch_codeword_scrambling_optim(harq->f,
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encoded_length,
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q,
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rel15->dlDmrsScramblingId,
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rel15->rnti,
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scrambled_output[q]);
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stop_meas(dlsch_scrambling_stats);
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#ifdef DEBUG_DLSCH
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printf("PDSCH scrambling:\n");
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for (int i=0; i<encoded_length>>8; i++) {
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for (int j=0; j<8; j++)
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printf("0x%08x\t", scrambled_output[0][(i<<3)+j]);
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printf("\n");
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}
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#endif
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/// Modulation
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start_meas(dlsch_modulation_stats);
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for (int q=0; q<rel15->NrOfCodewords; q++)
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nr_modulation(scrambled_output[q],
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encoded_length,
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Qm,
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mod_symbs[q]);
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stop_meas(dlsch_modulation_stats);
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#ifdef DEBUG_DLSCH
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printf("PDSCH Modulation: Qm %d(%d)\n", Qm, nb_re);
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for (int i=0; i<nb_re>>3; i++) {
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for (int j=0; j<8; j++) {
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printf("%d %d\t", mod_symbs[0][((i<<3)+j)<<1], mod_symbs[0][(((i<<3)+j)<<1)+1]);
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}
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printf("\n");
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}
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#endif
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/// Layer mapping
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nr_layer_mapping(mod_symbs,
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rel15->nrOfLayers,
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nb_re,
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tx_layers);
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#ifdef DEBUG_DLSCH
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printf("Layer mapping (%d layers):\n", rel15->nrOfLayers);
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for (int l=0; l<rel15->nrOfLayers; l++)
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for (int i=0; i<(nb_re/rel15->nrOfLayers)>>3; i++) {
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printf("layer %d, Re %d..%d : ",l,i<<3,(i<<3)+7);
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for (int j=0; j<8; j++) {
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printf("l%d %d\t", tx_layers[l][((i<<3)+j)<<1], tx_layers[l][(((i<<3)+j)<<1)+1]);
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}
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printf("\n");
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}
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#endif
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/// Antenna port mapping
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//to be moved to init phase potentially, for now tx_layers 1-8 are mapped on antenna ports 1000-1007
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/// DMRS QPSK modulation
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l0 = get_l0(rel15->dlDmrsSymbPos);
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nr_modulation(pdsch_dmrs[l0][0], n_dmrs, DMRS_MOD_ORDER, mod_dmrs); // currently only codeword 0 is modulated. Qm = 2 as DMRS is QPSK modulated
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#ifdef DEBUG_DLSCH
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printf("DMRS modulation (single symbol %d, %d symbols, type %d):\n", l0, n_dmrs>>1, dmrs_Type);
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for (int i=0; i<n_dmrs>>4; i++) {
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for (int j=0; j<8; j++) {
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printf("%d %d\t", mod_dmrs[((i<<3)+j)<<1], mod_dmrs[(((i<<3)+j)<<1)+1]);
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}
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printf("\n");
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}
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#endif
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/// Resource mapping
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// Non interleaved VRB to PRB mapping
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uint16_t start_sc = frame_parms->first_carrier_offset + rel15->rbStart*NR_NB_SC_PER_RB;
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if (start_sc >= frame_parms->ofdm_symbol_size)
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start_sc -= frame_parms->ofdm_symbol_size;
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#ifdef DEBUG_DLSCH_MAPPING
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printf("PDSCH resource mapping started (start SC %d\tstart symbol %d\tN_PRB %d\tnb_re %d,nb_layers %d)\n",
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start_sc, rel15->StartSymbolIndex, rel15->rbSize, nb_re,rel15->nrOfLayers);
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#endif
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for (int ap=0; ap<rel15->nrOfLayers; ap++) {
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// DMRS params for this ap
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get_Wt(Wt, ap, dmrs_Type);
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get_Wf(Wf, ap, dmrs_Type);
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delta = get_delta(ap, dmrs_Type);
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l_prime[0] = 0; // single symbol ap 0
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uint8_t dmrs_symbol = l0+l_prime[0];
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#ifdef DEBUG_DLSCH_MAPPING
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printf("DMRS Type %d params for ap %d: Wt %d %d \t Wf %d %d \t delta %d \t l_prime %d \t l0 %d\tDMRS symbol %d\n",
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1+dmrs_Type,ap, Wt[0], Wt[1], Wf[0], Wf[1], delta, l_prime[0], l0, dmrs_symbol);
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#endif
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uint8_t k_prime=0;
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uint16_t m=0, n=0, dmrs_idx=0, k=0;
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int txdataF_offset = (slot%2)*frame_parms->samples_per_slot_wCP;
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if (dmrs_Type == NFAPI_NR_DMRS_TYPE1) // another if condition to be included to check pdsch config type (reference of k)
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dmrs_idx = rel15->rbStart*6;
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else
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dmrs_idx = rel15->rbStart*4;
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for (int l=rel15->StartSymbolIndex; l<rel15->StartSymbolIndex+rel15->NrOfSymbols; l++) {
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k = start_sc;
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for (int i=0; i<rel15->rbSize*NR_NB_SC_PER_RB; i++) {
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if ((l == dmrs_symbol) && (k == ((start_sc+get_dmrs_freq_idx(n, k_prime, delta, dmrs_Type))%(frame_parms->ofdm_symbol_size)))) {
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((int16_t*)txdataF[ap])[((l*frame_parms->ofdm_symbol_size + k)<<1) + (2*txdataF_offset)] = (Wt[l_prime[0]]*Wf[k_prime]*amp*mod_dmrs[dmrs_idx<<1]) >> 15;
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((int16_t*)txdataF[ap])[((l*frame_parms->ofdm_symbol_size + k)<<1) + 1 + (2*txdataF_offset)] = (Wt[l_prime[0]]*Wf[k_prime]*amp*mod_dmrs[(dmrs_idx<<1) + 1]) >> 15;
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#ifdef DEBUG_DLSCH_MAPPING
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printf("dmrs_idx %d\t l %d \t k %d \t k_prime %d \t n %d \t txdataF: %d %d\n",
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dmrs_idx, l, k, k_prime, n, ((int16_t*)txdataF[ap])[((l*frame_parms->ofdm_symbol_size + k)<<1) + (2*txdataF_offset)],
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((int16_t*)txdataF[ap])[((l*frame_parms->ofdm_symbol_size + k)<<1) + 1 + (2*txdataF_offset)]);
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#endif
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dmrs_idx++;
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k_prime++;
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k_prime&=1;
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n+=(k_prime)?0:1;
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}
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else {
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((int16_t*)txdataF[ap])[((l*frame_parms->ofdm_symbol_size + k)<<1) + (2*txdataF_offset)] = (amp * tx_layers[ap][m<<1]) >> 15;
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((int16_t*)txdataF[ap])[((l*frame_parms->ofdm_symbol_size + k)<<1) + 1 + (2*txdataF_offset)] = (amp * tx_layers[ap][(m<<1) + 1]) >> 15;
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#ifdef DEBUG_DLSCH_MAPPING
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printf("m %d\t l %d \t k %d \t txdataF: %d %d\n",
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m, l, k, ((int16_t*)txdataF[ap])[((l*frame_parms->ofdm_symbol_size + k)<<1) + (2*txdataF_offset)],
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((int16_t*)txdataF[ap])[((l*frame_parms->ofdm_symbol_size + k)<<1) + 1 + (2*txdataF_offset)]);
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#endif
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m++;
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}
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if (++k >= frame_parms->ofdm_symbol_size)
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k -= frame_parms->ofdm_symbol_size;
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}
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}
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}
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return 0;
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}
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