/* * 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/MODULATION/beamforming.c * \brief * \author X. JIANG, F. Kaltenberger, R. KNOPP * \date 2016 * \version 0.1 * \company Eurecom * \email: xiwen.jiang@eurecom.fr,florian.kaltenberger@eurecom.fr,raymond.knopp@eurecom.fr * \note * \warning */ /*! \function beam_precoding_one_eNB * \brief Create and Implementation of beamforming in one eNB * \author TY Hsu, SY Yeh(fdragon), TH Wang(Judy) * \date 2018 * \version 0.1 * \company ISIP@NCTU and Eurecom * \email: tyhsu@cs.nctu.edu.tw,fdragon.cs96g@g2.nctu.edu.tw,Tsu-Han.Wang@eurecom.fr * \note * \warning */ #include "PHY/defs_common.h" #include "PHY/defs_eNB.h" #include "PHY/CODING/coding_defs.h" #include "PHY/CODING/coding_extern.h" #include "PHY/CODING/lte_interleaver_inline.h" #include "PHY/LTE_TRANSPORT/transport_eNB.h" #include "modulation_eNB.h" #include "nr_modulation.h" #include "common/utils/LOG/vcd_signal_dumper.h" #include "PHY/NR_TRANSPORT/nr_antenna_state.h" int beam_precoding(int32_t **txdataF, int32_t **txdataF_BF, int subframe, LTE_DL_FRAME_PARMS *frame_parms, int32_t **beam_weights[NUMBER_OF_eNB_MAX+1][15], int symbol, int aa, int p, int l1_id) { int rb_offset_neg0 = frame_parms->ofdm_symbol_size - (6*frame_parms->N_RB_DL); int rb_offset_neg = (subframe*frame_parms->ofdm_symbol_size*frame_parms->symbols_per_tti) + rb_offset_neg0; int rb_offset_pos = (subframe*frame_parms->ofdm_symbol_size*frame_parms->symbols_per_tti); multadd_cpx_vector((c16_t *)&txdataF[p][rb_offset_neg + (symbol * frame_parms->ofdm_symbol_size)], (c16_t *)&beam_weights[l1_id][p][aa][rb_offset_neg0], (c16_t *)&txdataF_BF[aa][rb_offset_neg0 + (symbol * frame_parms->ofdm_symbol_size)], 6 * frame_parms->N_RB_DL, 15); multadd_cpx_vector( (c16_t *)&txdataF[p][rb_offset_pos + (symbol * frame_parms->ofdm_symbol_size)], (c16_t *)&beam_weights[l1_id][p][aa][0], (c16_t *)&txdataF_BF[aa][(symbol * frame_parms->ofdm_symbol_size)], 7 * frame_parms->N_RB_DL, // to allow for extra RE at the end, 12 useless multipy-adds (first one at DC and 11 at end) 15); return 0; } int beam_precoding_one_eNB(int32_t **txdataF, int32_t **txdataF_BF, int32_t **beam_weights[NUMBER_OF_eNB_MAX+1][15], int subframe, int nb_antenna_ports, int nb_tx, // total physical antenna LTE_DL_FRAME_PARMS *frame_parms ) { int p, symbol, aa; // loop index int re_offset; int ofdm_symbol_size = frame_parms->ofdm_symbol_size; int symbols_per_tti = frame_parms->symbols_per_tti; int nb_antenna_ports_eNB = frame_parms->nb_antenna_ports_eNB; // logic antenna ports re_offset = ofdm_symbol_size*symbols_per_tti*subframe; // txdataF_BF[aa][re] = sum(beam_weghts[p][aa][re]*txdataF[p][re]), p=0~nb_antenna_ports-1 // real part and image part need to compute separately for (aa=0; aaofdm_symbol_size], 0, sizeof(c16_t) *(frame_parms->ofdm_symbol_size)); for (int p = 0; p < nb_antenna_ports; p++) { multadd_cpx_vector((c16_t *)&txdataF[p][(symbol * frame_parms->ofdm_symbol_size) + offset], (c16_t *)beam_weights[p][aa], (c16_t *)&txdataF_BF[aa][symbol * frame_parms->ofdm_symbol_size], frame_parms->ofdm_symbol_size, 15); } } void nr_beam_precoding_with_muting(c16_t **txdataF, c16_t **txdataF_BF, NR_DL_FRAME_PARMS *frame_parms, int32_t ***beam_weights, int slot, int symbol, int aa, int nb_antenna_ports, int offset, const nr_antenna_state_t *ant_state) { // Clear output buffer first memset(&txdataF_BF[aa][symbol * frame_parms->ofdm_symbol_size], 0, sizeof(c16_t) * frame_parms->ofdm_symbol_size); // O-RAN energy saving: skip precoding if antenna is muted // This implements transmission blanking per WG4 spec if (ant_state != NULL && !nr_is_tx_antenna_active(ant_state, aa)) { // Antenna is muted - output remains zero (transmission blank) LOG_D(PHY, "[ANTENNA_MUTE] Antenna %d muted, blanking transmission for symbol %d\n", aa, symbol); return; } // Normal precoding for active antennas for (int p = 0; p < nb_antenna_ports; p++) { multadd_cpx_vector((c16_t *)&txdataF[p][(symbol * frame_parms->ofdm_symbol_size) + offset], (c16_t *)beam_weights[p][aa], (c16_t *)&txdataF_BF[aa][symbol * frame_parms->ofdm_symbol_size], frame_parms->ofdm_symbol_size, 15); } }