PDSCH DM-RS Configuration
PDSCH channel estimation and alignment using PDSCH DM-RS.
Description
The PDSCH DM-RS Configuration block returns a PDSCHInd matrix containing the indices of the Demodulation Signal Resource (DM-RS) elements based on the downlink channel. The PDSCHInd matrix is derived using standard [1] section 7.4.1.1.1.2 for a given carrier configuration and PDSCH downlink common channel configuration.
Ports
Input
DCIBits - DCI input message
matrix
DCI bit sequence.
Dependencies
To use this port, select the Input ports checkbox.
Data types: Int64.
SSBInd - MIB information and parameters for the block
vector
MIB information and parameters for the block (NID structure and cell identifier ncelid) as a vector with integer values.
Dependencies
To use this port, select the Input ports checkbox.
Data types: Int64.
ResGrid - demodulated signal as a complex matrix
matrix
Demodulated signal returned as a complex matrix.
Data types: ComplexF64.
WTX - pre-coding matrix
matrix
Complex precoding matrix.
Dependencies
To use this port, deselect the Input ports checkbox.
Data types: ComplexF64.
Output
PDSCHInd - indices of demodulation signal resource elements
matrix
Indices of demodulation signal resource elements.
Data types: Int64.
PDSCHSym - demodulation reference signal symbols
matrix
Demodulation reference signal symbols returned as a complex matrix.
Data types: ComplexF64.
PRGGrid - demodulation reference signal symbols by resource element indices
matrix
PDSCHSym symbols by indices of PDSCHInd. This matrix is required to ensure that the PDSCHSym and PDSCHInd signals are transmitted correctly at the physical layer and can be used by the receiver for channel estimation and demodulation.
Dependencies
To use this port, uncheck the Input ports box.
Data types: ComplexF64.
Parameters
Main
Input ports - switching parameters and ports of the block
on (by default) | off
If this checkbox is checked, the block uses:
-
DCIBits, SSBInd and ResGrid input ports;
-
output ports PDSCHInd and PDSHSym;
-
parameters Block Pattern and Minimum channel bandwidth for the NRb (MHz).
If this checkbox is unchecked, the block uses:
-
ResGrid and WTX input ports;
-
output ports PDSCHInd, PDSHSym and PRGrid;
-
groups of parameters Carrier and PDSCH.
Block parameter |
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Values |
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By default |
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Block Pattern - frequency range identifier
Case A | Case B (by default) | Case C | Case D | Case E
For the 5G standard, the frequency range used is specified in the documentation.
| Frequency range designation | Frequency range |
|---|---|
FR1: |
410 MHz - 7125 MHz |
FR2: |
24250 MHz - 52600 MHz |
Dependencies
To use this parameters, tick the Input ports checkbox.
Block parameter |
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Values |
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By default |
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Minimum channel bandwidth for the NRb (MHz) - setting of the minimum channel bandwidth for the NR range
5 MHz (By default) | 10 MHz | 40 MHz
Set the minimum channel bandwidth for the NR band.
Dependencies
To use this parameters, select the Input ports checkbox.
Block parameter |
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Values |
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By default |
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Carrier
NCellID - physical layer cell identifier
1 (by default) | ` integer from 0 to 1007`
Physical level cell identifier specified as an integer from 0 to 1007.
Dependencies
To use this parameter, clear the Input ports checkbox.
Block parameter |
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Values |
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By default |
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NSizeGrid - number of deleted objects in the service provider’s resource table
51 (by default) | ` integer from 1 to 275`
The number of deleted objects in the service provider resource table, specified as an integer from 1 to 275. The by default value of 51 corresponds to the maximum number of resource blocks for a 10 MHz carrier and a subcarrier spacing of 15 kHz.
Dependencies
To use this parameters, uncheck the Input ports checkbox.
Block parameter |
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Values |
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By default |
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Subcarrier spacing (kHz) - subcarrier spacing in kHz
15(by default) | 30 | 60 | 120
Subcarrier spacing in kHz for all channels and carrier reference signals.
Selectable values: 15 or 30 for FR1, 60 or 120 for FR2.
Dependencies
To use this parameters, uncheck the Input ports box.
Block parameter |
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Values |
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By default |
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CyclicPrefix - length of the cyclic prefix
Normal (By default) | `Extended `
Length of cyclic prefix. Options to select:
-
Normal- Use this value to specify a normal cyclic prefix. This parameters corresponds to 14 OFDM characters in the slot. -
Extended- use this value to specify an extended cyclic prefix. This parameter corresponds to 12 OFDM characters in the slot. For the numbering specified in the standard [1] in section 4.2, the extended cyclic prefix length applies only for 60 kHz subcarrier spacing.
Dependencies
To use this parameters, uncheck the Input ports checkbox.
Block parameter |
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Values |
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By default |
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PDSCH
Number of PDSCH transmission layers - number of transmission layers for the PDSCH channel
1 (by default) | 2 | 3 | 4 | 5 | 6 | 7| 8
Number of data transmission layers for PDSCH (Physical Downlink Shared Channel) channel in 5G NR.
Dependencies
To use this parameters, clear the Input ports checkbox.
Block parameter |
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Values |
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By default |
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Number of PDSCH transmission antennas - number of antennas for PDSCH channel signal transmission
1 (by default) | 2 | 4 | 8 | 16 | 32 | 64| 128
Number of antennas used to carry the PDSCH (Physical Downlink Shared Channel) channel signal in the 5G NR standard.
Dependencies
To use this parameters, clear the Input ports checkbox.
Block parameter |
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Values |
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By default |
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Modulation - codeword modulation scheme
QPSK (by default) | 16QAM | 64QAM | 256QAM
Codeword modulation scheme.
Dependencies
To use this parameters, clear the Input ports checkbox.
Block parameter |
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Values |
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By default |
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TargetCodeRate - code frequency
120 (by default) | scalar
Code frequency as a scalar in the range from 0 to 1024.
Dependencies
To use this parameters, clear the Input ports checkbox.
Block parameter |
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Values |
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By default |
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Enable PRBSet - usage of a set of physically allocated resource blocks for data transmission
enabled (by default) | enabled
Enable or disable usage of a set of physically allocated resource blocks for data transfer. If this checkbox is selected, the PDSCH PRB allocation parameter can be used, which sets specific frequency resource ranges for signal or data transmission at the physical layer in 5G NR. This parameter determines which blocks of frequency spectrum from the available spectrum can be assigned to a channel. The usage of PDSCH PRB allocation allows to specify specific groups of frequency blocks and flexibly allocate frequency resources depending on communication requirements and network conditions.
Dependencies
To use this parameters, uncheck the Input ports checkbox.
Block parameter |
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Values |
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By default |
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PDSCH PRB allocation - frequency resource ranges
0:7 (By default)
Frequency resource ranges that can be used for signalling or data transmission at the physical layer.
Dependencies
To use this parameter, clear the Input ports checkbox and select the Enable PRBSet checkbox.
Block parameter |
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Values |
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By default |
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Enable or disable PT-RS - usage of phase change tracking signals
` disabled (by default)` | enabled
Enable or disable usage of PT-RS (Phase Tracking Reference Signal) in the PDSCH (Physical Downlink Shared Channel) in 5G NR. PT-RS serves to correct and compensate for phase noise due to transmitter and receiver instabilities. It is particularly useful at high modulation orders such as 256QAM or 1024QAM where the impact of phase errors can be significant. Enabling PT-RS improves data transmission quality by increasing synchronisation accuracy, especially under conditions of frequency interference or fast motion.
Dependencies
To use this parameters, uncheck the Input ports checkbox.
Block parameter |
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Values |
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By default |
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