PDSCH Modulation

PDSCH modulation.

pdsch modulation

Description

The PDSCH Modulation block creates a matrix containing the modulation symbols of the PDSCH common physical downlink channel in accordance with sections 7.3.1.1.1 to 7.3.1.3 of the standard [1], taking into account the carrier configuration, the PDSCH channel configuration and the DL-SCH codewords. The unit shall perform pre-coding for PDSCH binding in accordance with section 5.1.2.3 of the [2] standard to produce pre-coded PDSCHSym symbols and corresponding PDSCHInd indices.

Ports

Input

EncoderTR - DL-SCH codeword
matrix

DL-SCH code word.

Data types: Int8.

WTX - pre-coding matrix
matrix | scalar

Pre-encoding matrix.

Data types: ComplexF64, Int64, Float64.

Output

PDSCHSym - PDSCH modulation characters
matrix

PDSCH modulation symbols in the form of a complex matrix.

Data types: ComplexF64.

PDSCHInd - PDSCH modulation character indices
matrix

Indices of PDSCH modulation symbols.

Data types: UInt32.

Parameters

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.

Usage in program code
Block parameter	`ncellid`
Values	`целое число от 0 до 1007`
By default	`1`

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.

Usage in program code
Block parameter	`nsizegrid`
Values	`целое число от 1 до 275`
By default	`51`

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.

Usage in program code
Block parameter	`SubcarrierSpacingCommon`
Values	`15` \| `30` \| `60` \| `120`
By default	`15`

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.

Usage in program code
Block parameter	`cyclicprefix`
Values	`Normal` \| `Extended`
By default	`Normal`

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.

Usage in program code
Block parameter	`numlayers`
Values	`1` \| `2` \| `3` \| `4` \| `5` \| `6` \| `7` \| `8`
By default	`1`

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.

Usage in program code
Block parameter	`ntxants`
Values	`1` \| `2` \| `4` \| `8` \| `16` \| `32` \| `64` \| `128`
By default	`1`

Modulation - codeword modulation scheme
QPSK (by default) | 16QAM | 64QAM | 256QAM

Codeword modulation scheme.

Usage in program code
Block parameter	`modulation`
Values	`QPSK` \| `16QAM` \| `64QAM` \| `256QAM`
By default	`QPSK`

TargetCodeRate - code frequency
120 (by default) | scalar

Code frequency as a scalar in the range from 0 to 1024.

Usage in program code
Block parameter	`targetcoderate`
Values	`scalar`
By default	`120`

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.

Usage in program code
Block parameter	`enableprbset`
Values	`off` \| `on`
By default	`off`

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, select the Enable PRBSet check box.

Usage in program code
Block parameter	`prbset`
Values	`0:7`
By default	`0:7`

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.

Usage in program code
Block parameter	`enableptrs`
Values	`off` \| `on`
By default	`off`

References

3GPP TS 38.211. "NR; Physical channels and modulation." 3rd Generation Partnership Project; Technical Specification Group Radio Access Network.
3GPP TS 38.214. "NR; Physical layer procedures for data." 3rd Generation Partnership Project; Technical Specification Group Radio Access Network.
Glossary: Standard 5G