nrPDSCHPTRS

Generate PDSCH PT-RS symbols

Since R2020a

Syntax

sym = nrPDSCHPTRS(carrier,pdsch)

sym = nrPDSCHPTRS(carrier,pdsch,'OutputDataType',datatype)

Description

sym = nrPDSCHPTRS(carrier,pdsch) returns sym, which contains phase tracking reference signal (PT-RS) symbols of the physical downlink shared channel (PDSCH), as defined in TS 38.211 Section 7.4.1.2.1 [1]. carrier specifies the carrier configuration parameters for a specific OFDM numerology and pdsch specifies the PDSCH configuration parameters.

sym = nrPDSCHPTRS(carrier,pdsch,'OutputDataType',datatype) specifies the data type of the output PT-RS symbols.

Examples

Generate PDSCH PT-RS Symbols and Indices

Create a carrier configuration object with default properties. This object corresponds to a 10 MHz carrier.

carrier = nrCarrierConfig;

Create a default PDSCH configuration object, and then enable the PT-RS configuration.

pdsch = nrPDSCHConfig;
pdsch.EnablePTRS = 1;

Create a PDSCH phase tracking reference signal (PT-RS) configuration object with specified properties.

ptrs = nrPDSCHPTRSConfig;
ptrs.TimeDensity = 2;
ptrs.FrequencyDensity = 4;
ptrs.REOffset = '10';

Assign the PDSCH PT-RS configuration object to PTRS property of PDSCH configuration object.

pdsch.PTRS = ptrs;

Generate PDSCH PT-RS symbols of data type single.

sym = nrPDSCHPTRS(carrier,pdsch,'OutputDataType','single')

sym = 78x1 single column vector

  -0.7071 - 0.7071i
  -0.7071 - 0.7071i
   0.7071 - 0.7071i
   0.7071 - 0.7071i
   0.7071 - 0.7071i
  -0.7071 - 0.7071i
  -0.7071 + 0.7071i
  -0.7071 - 0.7071i
  -0.7071 + 0.7071i
   0.7071 + 0.7071i
      ⋮

Generate PDSCH PT-RS indices in subscript form and set the index orientation to bandwidth part.

ind = nrPDSCHPTRSIndices(carrier,pdsch,'IndexStyle','subscript','IndexOrientation','bwp')

ind = 78x3 uint32 matrix

    19     1     1
    67     1     1
   115     1     1
   163     1     1
   211     1     1
   259     1     1
   307     1     1
   355     1     1
   403     1     1
   451     1     1
      ⋮

Input Arguments

carrier — Carrier configuration parameters

nrCarrierConfig object

Carrier configuration parameters for a specific OFDM numerology, specified as an nrCarrierConfig object. This function uses only these properties of the nrCarrierConfig object.

• NCellID

• SubcarrierSpacing

• CyclicPrefix

• NSizeGrid

• NStartGrid

• NSlot

pdsch — PDSCH configuration parameters

nrPDSCHConfig object

PDSCH configuration parameters, specified as an nrPDSCHConfig object. This function only uses these nrPDSCHConfig object properties.

• NSizeBWP

• NStartBWP

• ReservedPRB

• ReservedRE

• NumLayers

• MappingType

• SymbolAllocation

• PRBSet

• RNTI

• DMRS

• EnablePTRS

• PTRS

datatype — Data type of generated PT-RS symbols

'double' (default) | 'single'

Data type for the generated PT-RS symbols, specified as 'double' or 'single'.

Data Types: char | string

Output Arguments

sym — PT-RS symbols

complex column vector

PT-RS symbols, returned as a complex column vector.

Data Types: double | single
Complex Number Support: Yes

References

[1] 3GPP TS 38.211. “NR; Physical channels and modulation.” 3rd Generation Partnership Project; Technical Specification Group Radio Access Network.

Extended Capabilities

C/C++ Code Generation

Generate C and C++ code using MATLAB® Coder™.

Usage notes and limitations:

The datatype input argument must be compile-time constant. For example, when specifying 'single' as the output data type, include {coder.Constant('OutputDataType'),coder.Constant('single')} in the -args value of the codegen function. For more information, see the coder.Constant (MATLAB Coder) class.

Version History

Introduced in R2020a