Engee documentation

DL-SCH Encode

Processing of the common DL-SCH downlink.

blockType: DLSCHEncode

Path in the library:

/5G/DL-SCH Encode

Description

Block DL-SCH Encode accepts the TrBlocks transport block and processes it using the components of the shared downlink channel (DL-SCH) in accordance with section 7.2 of the standard [1].

The DL-SCH encoding process consists of cyclic redundancy check (CRC), code block segmentation, low-density parity check (LDPC) encoding, and rate matching.

Ports

Input

# TrBlocks — transport block
vector

Details

The transport block.

Data types

Int64, Int8

Complex numbers support

No

Output

# EncoderTR — coded transport block
the matrix

Details

The encoded transport block is DL-SCH.

Data types

Int8

Complex numbers support

No

Parameters

Carrier

# NCellID — physical layer cell ID
Real number

Details

The identifier of the physical layer cell, set as an integer from 0 before 1007.

Default value

1

Program usage name

ncellid

Tunable

No

Evaluatable

Yes

# NSizeGrid — the number of deleted objects in the telecom operator’s resource table
Real number

Details

The number of deleted objects in the telecom operator’s resource table, indicated as an integer from 1 before 275. The default value is 51, corresponds to the maximum number of resource blocks for the carrier 10 MHz and the distance between subcarriers 15 kHz.

Default value

51

Program usage name

nsizegrid

Tunable

No

Evaluatable

Yes

# Subcarrier spacing (kHz) — the distance between subcarriers in kHz
15 | 30 | 60 | 120

Details

The distance between subcarriers in kHz for all channels and carrier reference signals.

Values to choose from: 15 or 30 for FR1, 60 or 120 for FR2.

Values

15 | 30 | 60 | 120

Default value

15

Program usage name

subcarrierspacingcommon

Tunable

No

Evaluatable

No

# CyclicPrefix — length of the cyclic prefix
Normal | Extended

Details

The length of the cyclic prefix. Options to choose from:

  • Normal — use this value to specify the usual cyclic prefix. This parameter corresponds to 14 OFDM symbols in the slot.

  • Extended — use this value to specify an extended cyclic prefix. This parameter corresponds to 12 OFDM symbols in the slot. For the numbering specified in the standard [2] in section 4.2, the length of the extended cyclic prefix is used only for the distance between subcarriers 60 kHz.

Values

Normal | Extended

Default value

Normal

Program usage name

cyclicprefix

Tunable

No

Evaluatable

No

PDSCH

# Number of PDSCH transmission layers — number of data transmission layers for the PDSCH channel
1 | 2 | 3 | 4 | 5 | 6 | 7 | 8

Details

The number of data transmission layers for the PDSCH (Physical Downlink Shared Channel, physical channel of the common downlink) in 5G NR.

Values

1 | 2 | 3 | 4 | 5 | 6 | 7 | 8

Default value

1

Program usage name

numlayers

Tunable

No

Evaluatable

No

# Number of PDSCH transmission antennas — number of antennas for transmitting the PDSCH channel signal
1 | 2 | 4 | 8 | 16 | 32 | 64 | 128

Details

The number of antennas used to transmit the PDSCH (Physical Downlink Shared Channel) signal in the 5G standard NR.

Values

1 | 2 | 4 | 8 | 16 | 32 | 64 | 128

Default value

1

Program usage name

ntxants

Tunable

No

Evaluatable

No

# Modulation — code word modulation scheme
QPSK | 16QAM | 64QAM | 256QAM

Details

The code word modulation scheme.

Values

QPSK | 16QAM | 64QAM | 256QAM

Default value

QPSK

Program usage name

modulation

Tunable

No

Evaluatable

No

# TargetCodeRate — code frequency
Real number

Details

The code frequency in the form of a scalar in the range from 0 before 1024.

Default value

120

Program usage name

targetcoderate

Tunable

No

Evaluatable

Yes

# Enable PRBSet — using a set of physically allocated resource blocks for data transfer
Logical

Details

Enable or disable the use of a set of physically allocated resource blocks for data transfer. If this option is selected, you can use the parameter PDSCH PRB allocation, which sets specific frequency resource ranges for transmitting signals or data at the physical layer in 5G NR. This parameter determines which blocks of the available frequency spectrum can be assigned to the channel. Using PDSCH PRB allocation It allows you to specify specific groups of frequency blocks and flexibly allocate frequency resources depending on communication requirements and network conditions.

Default value

false (switched off)

Program usage name

enableprbset

Tunable

No

Evaluatable

No

# PDSCH PRB allocation — frequency resource ranges

Details

Ranges of frequency resources that can be used to transmit signals or data at the physical layer.

Dependencies

To use this option, check the box Enable PRBSet.

Default value

0:7

Program usage name

prbset

Tunable

No

Evaluatable

Yes

# Enable or disable PT-RS — using phase change tracking signals
Logical

Details

Enable or disable the use of phase change tracking signals (PT-RS, Phase Tracking Reference Signal) in the PDSCH (Physical Downlink Shared Channel) in 5G NR. PT-RS is used to correct and compensate for phase noise caused by instabilities of the transmitter and receiver. It is especially useful at high modulation orders, such as 256QAM or 1024QAM where the influence of phase errors can be significant. Enabling PT-RS improves data transmission quality by increasing synchronization accuracy, especially in conditions of frequency interference or fast movement.

Default value

false (switched off)

Program usage name

enableptrs

Tunable

No

Evaluatable

No

  1. 3GPP TS 38.212. «NR; Multiplexing and channel coding.» 3rd Generation Partnership Project; Technical Specification Group Radio Access Network.

  2. 3GPP TS 38.211. «NR; Physical channels and modulation.» 3rd Generation Partnership Project; Technical Specification Group Radio Access Network.

  3. Glossary: Standard 5G