Struct that tracks all necessary parameters for PDSCH DMRS computation. This struct is also used in PDSCH modulation. There is one PdschDmrsParams struct per TB.

#include <cuphy.h>

Data Fields
float	beta_dmrs

float	beta_qam

uint16_t	BWP_start_PRB

uint32_t	cell_id

uint8_t	cell_index_in_cell_group

void *	cell_output_tensor_addr

uint64_t	data_sym_loc

uint32_t	dmrs_scid

uint16_t	dmrs_sym_loc

uint8_t	enablePrcdBf

uint32_t	n_scid

uint8_t	Np

uint16_t	num_BWP_PRBs

uint8_t	num_data_symbols

uint8_t	num_dmrs_symbols

uint8_t	num_layers

uint16_t	num_Rbs

__half2	pmW [MAX_DL_LAYERS_PER_TB *MAX_DL_PORTS]

uint8_t	port_ids [MAX_DL_LAYERS_PER_TB]

uint8_t	ref_point

uint32_t	slot_number

uint16_t	start_Rb

uint8_t	symbol_number

uint8_t	ueGrp_idx

Field Documentation

◆ beta_dmrs

float PdschDmrsParams::beta_dmrs

DMRS amplitude scaling

◆ beta_qam

float PdschDmrsParams::beta_qam

QAM amplitude scaling

◆ BWP_start_PRB

uint16_t PdschDmrsParams::BWP_start_PRB

start PRB for this bandwidth part. Used only if ref_point is 1.

◆ cell_id

uint32_t PdschDmrsParams::cell_id

gnb_pars.cellId

◆ cell_index_in_cell_group

uint8_t PdschDmrsParams::cell_index_in_cell_group

Different than cell_id.

◆ cell_output_tensor_addr

void* PdschDmrsParams::cell_output_tensor_addr

output address for the cell this TB belong to. NB: replicates information across all TBs in the same cell. Could alternatively add a field with the cell index in cell group, and maintain a separate array of cell indices to be used both by DMRS and modulation.

◆ data_sym_loc

uint64_t PdschDmrsParams::data_sym_loc

Starting from least significant bit the first 4 * num_data_symbols bits are valid and specify the location of the data symbols. 4 bits are used for each position.

◆ dmrs_scid

uint32_t PdschDmrsParams::dmrs_scid

DMRS scrambling Id

◆ dmrs_sym_loc

uint16_t PdschDmrsParams::dmrs_sym_loc

Starting from least significant bit the first 4 * num_drms_symbols bits are valid and specify the location of the DMRS symbols. 4 bits are used for each position.

◆ enablePrcdBf

uint8_t PdschDmrsParams::enablePrcdBf

is pre-coding enabled

◆ n_scid

uint32_t PdschDmrsParams::n_scid

scrambling Id used

◆ Np

uint8_t PdschDmrsParams::Np

number of antenna ports for this UE when precoding is enabled (enablePrcdBf true); 0 otherwise.

◆ num_BWP_PRBs

uint16_t PdschDmrsParams::num_BWP_PRBs

number of PRBs in this bandwidth part.

◆ num_data_symbols

uint8_t PdschDmrsParams::num_data_symbols

number of data symbols

◆ num_dmrs_symbols

uint8_t PdschDmrsParams::num_dmrs_symbols

number of DMRS symbols

◆ num_layers

uint8_t PdschDmrsParams::num_layers

number of layers

◆ num_Rbs

uint16_t PdschDmrsParams::num_Rbs

number of allocated RBs (Resource Blocks), at most 273. 0=Don't format modulator output

◆ pmW

__half2 PdschDmrsParams::pmW[MAX_DL_LAYERS_PER_TB *MAX_DL_PORTS]

pre-coding matrix to be used only if enablePrcdBf is true with num_layers rows and Np columns

◆ port_ids

uint8_t PdschDmrsParams::port_ids[MAX_DL_LAYERS_PER_TB]

at most 8 ports supported for DMRS configuration type 1 per UE, but this is per TB; only the first num_layers values are valid; actual port is +1000

◆ ref_point

uint8_t PdschDmrsParams::ref_point

DMRS reference point: 0 or 1

◆ slot_number

uint32_t PdschDmrsParams::slot_number

from gnb_pars.slotNumber

◆ start_Rb

uint16_t PdschDmrsParams::start_Rb

initial RB (0 indexing)

◆ symbol_number

uint8_t PdschDmrsParams::symbol_number

index of initial symbol (0-based).

◆ ueGrp_idx

uint8_t PdschDmrsParams::ueGrp_idx

UE group identifier associated with this TB

Data Fields