256 lines
11 KiB
C
256 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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#ifndef __LTE_ESTIMATION_DEFS__H__
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#define __LTE_ESTIMATION_DEFS__H__
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#include "PHY/defs.h"
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/** @addtogroup _PHY_PARAMETER_ESTIMATION_BLOCKS_
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* @{
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*/
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/*!\brief Timing drift hysterisis in samples*/
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#define SYNCH_HYST 2
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/*!
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\brief This function is used for time-frequency scanning prior to complete cell search. It scans
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over the entire LTE band for maximum correlation and keeps the 10 best scores and the correspoding frequency offset (5 kHz granularity) for each of the 3 PSS sequences.
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\param ue Pointer to UE variables
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\param band index of lte band
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\param DL_freq Central RF Frequency in Hz
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*/
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/*!
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\brief This function allocates memory needed for the synchronization.
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\param frame_parms LTE DL frame parameter structure
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*/
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int lte_sync_time_init(LTE_DL_FRAME_PARMS *frame_parms); //LTE_UE_COMMON *common_vars
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/*! \fn void lte_sync_time_free()
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\brief This function frees the memory allocated by lte_sync_time_init.
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*/
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void lte_sync_time_free(void);
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/*!
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\brief This function performs the coarse timing synchronization.
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The algorithm uses a time domain correlation with a downsampled version of the received signal.
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\param rxdata Received time domain data for all rx antennas
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\param frame_parms LTE DL frame parameter structure
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\param eNB_id return value with the eNb_id
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\return sync_pos Position of the sync within the frame (downsampled) if successfull and -1 if there was an error or no peak was detected.
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*/
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int lte_sync_time(int **rxdata,
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LTE_DL_FRAME_PARMS *frame_parms,
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int *eNB_id);
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/*!
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\brief This function performs the coarse frequency and PSS synchronization.
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The algorithm uses a frequency-domain correlation. It scans over 20 MHz/10ms signal chunks using each of the 3 PSS finding the most likely (strongest) carriers and their frequency offset (+-2.5 kHz).
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\param ue Pointer to UE data structure
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\param band index of band in scan_info structure, used to store statistics
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\param DL_freq center frequency of band being scanned, used when storing statistics
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*/
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void lte_sync_timefreq(PHY_VARS_UE *ue,int band,unsigned int DL_freq);
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/*!
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\brief This function performs detection of the PRACH (=SRS) at the eNb to estimate the timing advance
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The algorithm uses a time domain correlation with a downsampled version of the received signal.
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\param rxdata Received time domain data for all rx antennas
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\param frame_parms LTE DL frame parameter structure
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\param length Length for correlation
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\param peak_val pointer to value of returned peak
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\param sync_corr_eNb pointer to correlation buffer
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\return sync_pos Position of the sync within the frame (downsampled) if successfull and -1 if there was an error or no peak was detected.
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*/
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int lte_sync_time_eNB(int32_t **rxdata,
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LTE_DL_FRAME_PARMS *frame_parms,
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uint32_t length,
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uint32_t *peak_val,
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uint32_t *sync_corr_eNb);
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int lte_sync_time_eNB_emul(PHY_VARS_eNB *phy_vars_eNb,
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uint8_t sect_id,
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int32_t *sync_val);
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/*!
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\brief This function performs channel estimation including frequency and temporal interpolation
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\param phy_vars_ue Pointer to UE PHY variables
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\param eNB_id Index of target eNB
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\param eNB_offset Offset for interfering eNB (in terms cell ID mod 3)
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\param Ns slot number (0..19)
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\param p antenna port
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\param l symbol within slot
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\param symbol symbol within frame
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*/
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int lte_dl_channel_estimation(PHY_VARS_UE *phy_vars_ue,
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module_id_t eNB_id,
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uint8_t eNB_offset,
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uint8_t Ns,
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uint8_t p,
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uint8_t l,
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uint8_t symbol);
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int lte_dl_bf_channel_estimation(PHY_VARS_UE *phy_vars_ue,
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module_id_t eNB_id,
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uint8_t eNB_offset,
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uint8_t Ns,
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uint8_t p,
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uint8_t symbol);
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int lte_dl_msbfn_channel_estimation(PHY_VARS_UE *phy_vars_ue,
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module_id_t eNB_id,
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uint8_t eNB_offset,
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int subframe,
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unsigned char l,
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unsigned char symbol);
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int lte_dl_mbsfn_channel_estimation(PHY_VARS_UE *phy_vars_ue,
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module_id_t eNB_id,
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uint8_t eNB_offset,
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int subframe,
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unsigned char l);
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/*!
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\brief Frequency offset estimation for LTE
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We estimate the frequency offset by calculating the phase difference between channel estimates for symbols carrying pilots (l==0 or l==3/4). We take a moving average of the phase difference.
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\param dl_ch_estimates pointer to structure that holds channel estimates (one slot)
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\param frame_parms pointer to LTE frame parameters
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\param l symbol within slot
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\param freq_offset pointer to the returned frequency offset
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\param reset When non-zer it resets the filter to the initial value (set whenever tuning has been changed or for a one-shot estimate)
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*/
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int lte_est_freq_offset(int **dl_ch_estimates,
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LTE_DL_FRAME_PARMS *frame_parms,
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int l,
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int* freq_offset,
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int reset);
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int lte_mbsfn_est_freq_offset(int **dl_ch_estimates,
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LTE_DL_FRAME_PARMS *frame_parms,
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int l,
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int* freq_offset);
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/*! \brief Tracking of timing for LTE
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This function computes the time domain channel response, finds the peak and adjusts the timing in pci_interface.offset accordingly.
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\param frame_parms LTE DL frame parameter structure
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\param phy_vars_ue Pointer to UE PHY data structure
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\param eNb_id
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\param clear If clear==1 moving average filter is reset
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\param coef Coefficient of the moving average filter (Q1.15)
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*/
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void lte_adjust_synch(LTE_DL_FRAME_PARMS *frame_parms,
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PHY_VARS_UE *phy_vars_ue,
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module_id_t eNb_id,
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uint8_t subframe,
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unsigned char clear,
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short coef);
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//! \brief this function fills the PHY_VARS_UE->PHY_measurement structure
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void lte_ue_measurements(PHY_VARS_UE *phy_vars_ue,
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unsigned int subframe_offset,
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unsigned char N0_symbol,
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unsigned char abstraction_flag,
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unsigned char rank_adaptation,
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uint8_t subframe);
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//! \brief This function performance RSRP/RSCP measurements
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void ue_rrc_measurements(PHY_VARS_UE *phy_vars_ue,
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uint8_t slot,
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uint8_t abstraction_flag);
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void lte_ue_measurements_emul(PHY_VARS_UE *phy_vars_ue,uint8_t last_slot,uint8_t eNB_id);
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/*! \brief Function to return the path-loss based on the UE cell-specific reference signal strength and transmission power of eNB
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@param Mod_id Module ID for UE
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@param eNB_index Index of eNB on which to act
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@returns Path loss in dB
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*/
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int16_t get_PL(module_id_t Mod_id,uint8_t CC_id,uint8_t eNB_index);
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double get_RSRP(module_id_t Mod_id,uint8_t CC_id,uint8_t eNB_index);
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uint32_t get_RSRQ(module_id_t Mod_id,uint8_t CC_id,uint8_t eNB_index);
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uint8_t get_n_adj_cells(module_id_t Mod_id,uint8_t CC_id);
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uint32_t get_rx_total_gain_dB(module_id_t Mod_id,uint8_t CC_id);
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uint32_t get_RSSI(module_id_t Mod_id,uint8_t CC_id);
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int8_t set_RSRP_filtered(module_id_t Mod_id,uint8_t CC_id,uint8_t eNB_index,float rsrp);
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int8_t set_RSRQ_filtered(module_id_t Mod_id,uint8_t CC_id,uint8_t eNB_index,float rstq);
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//! Automatic gain control
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void phy_adjust_gain (PHY_VARS_UE *phy_vars_ue,
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uint32_t rx_power_fil_dB,
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unsigned char eNB_id);
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int lte_ul_channel_estimation(PHY_VARS_eNB *phy_vars_eNB,
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eNB_rxtx_proc_t *proc,
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module_id_t UE_id,
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uint8_t l,
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uint8_t Ns);
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int16_t lte_ul_freq_offset_estimation(LTE_DL_FRAME_PARMS *frame_parms,
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int32_t *ul_ch_estimates,
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uint16_t nb_rb);
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int lte_srs_channel_estimation(LTE_DL_FRAME_PARMS *frame_parms,
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LTE_eNB_COMMON *eNB_common_vars,
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LTE_eNB_SRS *eNB_srs_vars,
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SOUNDINGRS_UL_CONFIG_DEDICATED *soundingrs_ul_config_dedicated,
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unsigned char sub_frame_number,
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unsigned char eNB_id);
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int lte_est_timing_advance(LTE_DL_FRAME_PARMS *frame_parms,
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LTE_eNB_SRS *lte_eNb_srs,
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unsigned int *eNb_id,
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unsigned char clear,
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unsigned char number_of_cards,
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short coef);
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int lte_est_timing_advance_pusch(PHY_VARS_eNB* phy_vars_eNB,module_id_t UE_id);
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void lte_eNB_I0_measurements(PHY_VARS_eNB *phy_vars_eNB,
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int subframe,
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module_id_t eNB_id,
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unsigned char clear);
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void lte_eNB_I0_measurements_emul(PHY_VARS_eNB *phy_vars_eNB,
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uint8_t sect_id);
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void lte_eNB_srs_measurements(PHY_VARS_eNB *phy_vars_eNBy,
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module_id_t eNB_id,
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module_id_t UE_id,
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unsigned char init_averaging);
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void freq_equalization(LTE_DL_FRAME_PARMS *frame_parms,
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int **rxdataF_comp,
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int **ul_ch_mag,
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int **ul_ch_mag_b,
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unsigned char symbol,
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unsigned short Msc_RS,
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unsigned char Qm);
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/** @} */
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#endif
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