Sakthivel Velumani
043da0c440
Till this commit, the UE gets the position of SSB in frequency from command line and does the syncronization by locating the SSB in time. It does this by generating a PSS time signal during initialization with the SSB offset given via command line. Then PSS detection is done by correlation. In this commit, the UE computes a list of GSCN in the current NR band that falls within the current bandwidth for the set center frequency. For each GSCN in the list, the UE starts a thread and performs the following: 1. Generate PSS time signal with SSB offset for current GSCN. 2. Detect PSS, SSS and decode PBCH (this step remains the same). After all threads finishes, the results are collected. For now, only the first detected PBCH is used to proceed further. So this PBCH is indicated to MAC and UE exits initial sync. Future work: The cell search can be standalone feature where the UE could scan for SSB in the entire NR band. This would require changing radio's frequency on the fly as the UE's bandwidth would not cover an entire NR band. The cell detection can futher be imporved by looking for SIB1 for each decoded PBCH.
101 lines
3.5 KiB
C
101 lines
3.5 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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#ifndef __MODULATION_DEFS__H__
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#define __MODULATION_DEFS__H__
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#include "PHY/defs_common.h"
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#include "modulation_common.h"
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#include "PHY/defs_UE.h"
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#include "PHY/defs_nr_UE.h"
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/** @addtogroup _PHY_MODULATION_
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* @{
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*/
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/*!
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\brief This function implements the OFDM front end processor on reception (FEP)
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\param phy_vars_ue Pointer to PHY variables
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\param l symbol within slot (0..6/7)
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\param Ns Slot number (0..19)
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\param sample_offset offset within rxdata (points to beginning of subframe)
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\param no_prefix if 1 prefix is removed by HW
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\param reset_freq_est if non-zero it resets the frequency offset estimation loop
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*/
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int slot_fep(PHY_VARS_UE *phy_vars_ue,
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unsigned char l,
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unsigned char Ns,
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int sample_offset,
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int no_prefix,
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int reset_freq_est);
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int nr_slot_fep(PHY_VARS_NR_UE *ue,
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NR_DL_FRAME_PARMS *frame_parms,
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const UE_nr_rxtx_proc_t *proc,
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unsigned char symbol,
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c16_t rxdataF[][frame_parms->samples_per_slot_wCP],
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uint32_t linktype);
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int sl_nr_slot_fep(PHY_VARS_NR_UE *ue,
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UE_nr_rxtx_proc_t *proc,
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unsigned char symbol,
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unsigned char Ns,
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uint32_t sample_offset,
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c16_t rxdataF[][ue->SL_UE_PHY_PARAMS.sl_frame_params.samples_per_slot_wCP]);
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int nr_slot_fep_init_sync(const NR_DL_FRAME_PARMS *frame_parms,
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unsigned char symbol,
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int sample_offset,
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const c16_t **rxdata,
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c16_t rxdataF[][frame_parms->samples_per_slot_wCP],
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int link_type);
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int slot_fep_mbsfn(PHY_VARS_UE *phy_vars_ue,
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unsigned char l,
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int subframe,
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int sample_offset,
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int no_prefix);
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int slot_fep_mbsfn_khz_1dot25(PHY_VARS_UE *phy_vars_ue,
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int subframe,
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int sample_offset);
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int front_end_fft(PHY_VARS_UE *ue,
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unsigned char l,
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unsigned char Ns,
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int sample_offset,
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int no_prefix);
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int front_end_chanEst(PHY_VARS_UE *ue,
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unsigned char l,
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unsigned char Ns,
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int reset_freq_est);
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void apply_7_5_kHz(PHY_VARS_UE *phy_vars_ue,int32_t*txdata,uint8_t subframe);
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int compute_BF_weights(int32_t **beam_weights, int32_t **calib_dl_ch_estimates, PRECODE_TYPE_t precode_type, int nb_ant, int nb_freq);
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/** @}*/
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#endif
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