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nrPUSCHPTRSIndices

Generate PUSCH PT-RS Indices

Description

example

ind = nrPUSCHPTRSIndices(carrier,pusch) returns ind in matrix form, which contains phase tracking reference signal (PT-RS) resource elements (RE) of the physical uplink shared channel (PUSCH), as defined in TS 38.211 Section 6.4.1.2.2 [1]. The number of columns in ind depends on the transmission scheme and transform precoding. carrier specifies the carrier configuration parameters for a specific OFDM numerology and pusch specifies the PUSCH configuration parameters. When you enable transform precoding, the indices are generated relative to the start of the PUSCH allocation.

example

ind = nrPUSCHPTRSIndices(carrier,pusch,Name,Value) specifies output formatting options using one or more name-value pair arguments. Unspecified options take default values.

Examples

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Create a carrier configuration object with default properties. This object corresponds to a 10 MHz carrier with 15 kHz subcarrier spacing.

carrier = nrCarrierConfig;

Create a PUSCH configuration object with codebook-based transmission and enable the PT-RS configuration. Set the number of antenna ports to 4 and transform precoding to 0. When transform precoding is 0, the waveform type is cyclic-prefix orthogonal frequency division multiplexing (CP-OFDM).

pusch = nrPUSCHConfig;
pusch.TransformPrecoding = 0;
pusch.TransmissionScheme = 'codebook';
pusch.NumAntennaPorts = 4;
pusch.EnablePTRS = 1;

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

ptrs = nrPUSCHPTRSConfig;
ptrs.TimeDensity = 2;
ptrs.FrequencyDensity = 4;
ptrs.REOffset = '11';

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

pusch.PTRS = ptrs;

Generate PUSCH PT-RS indices in subscript form

ind = nrPUSCHPTRSIndices(carrier,pusch,'IndexStyle','subscript')
ind = 312x3 uint32 matrix

    21     1     1
    69     1     1
   117     1     1
   165     1     1
   213     1     1
   261     1     1
   309     1     1
   357     1     1
   405     1     1
   453     1     1
      ⋮

Create a carrier configuration object with 30 kHz subcarrier spacing and 5 MHz transmission bandwidth.

carrier = nrCarrierConfig;
carrier.SubcarrierSpacing = 30;
carrier.NSizeGrid = 11;

Create a PUSCH configuration object with intraslot frequency hopping and enable the PT-RS configuration. Set the transform precoding to 1, starting physical resource blocks (PRB) index of the second hop to 3 and PRB set to 0:5. When transform precoding is 1, the waveform type is discrete fourier transform spread orthogonal frequency division multiplexing (DFT-s-OFDM).

pusch = nrPUSCHConfig;
pusch.PRBSet = 0:5;
pusch.TransformPrecoding = 1;
pusch.FrequencyHopping = 'intraSlot';
pusch.SecondHopStartPRB = 3;
pusch.EnablePTRS = 1;

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

ptrs = nrPUSCHPTRSConfig;
ptrs.TimeDensity = 2;
ptrs.NumPTRSSamples = 4;
ptrs.NumPTRSGroups = 8;
ptrs.NID = 750;

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

pusch.PTRS = ptrs;

Generate PUSCH PT-RS symbols of data type single.

sym = nrPUSCHPTRS(carrier,pusch,'OutputDataType','single')
sym = 192x1 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 PUSCH PT-RS indices in subscript form.

ind = nrPUSCHPTRSIndices(carrier,pusch,'IndexStyle','subscript')
ind = 192x3 uint32 matrix

    1    1    1
    2    1    1
    3    1    1
    4    1    1
   12    1    1
   13    1    1
   14    1    1
   15    1    1
   21    1    1
   22    1    1
      ⋮

Input Arguments

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

Property FieldValuesDescription
SubcarrierSpacing

15 (default), 30, 60, 120, 240

Subcarrier spacing in kHz

CyclicPrefix

'normal' (default), 'extended'

Cyclic prefix length, specified as one of these options.

  • 'normal' corresponds to 14 OFDM symbols in a slot.

  • 'extended' corresponds to 12 OFDM symbols in a slot.

For the numerologies specified in TS 38.211 Section 4.2, extended cyclic prefix length applies only for 60 kHz subcarrier spacing.

NSizeGrid

52 (default), integer from 1 to 275

Number of resource blocks in the carrier resource grid

NStartGrid

0 (default), integer from 0 to 2199

Start of carrier resource grid relative to common resource block 0 (CRB 0)

NSlot

0 (default), nonnegative integer scalar

Slot number. You can set NSlot to a value larger than the number of slots per frame.

PUSCH configuration parameters, specified as an nrPUSCHConfig object. This function uses only these nrPUSCHConfig object properties.

Property FieldValuesDescription
NSizeBWP

[] (default), integer from 1 to 275

Size of the bandwidth part (BWP) in terms of number of physical resource blocks (PRBs). The default value of [] implies that the value is equal to NSizeGrid of carrier input argument.

NStartBWP

[] (default), integer from 0 to 2473

Starting PRB index of BWP relative to CRB 0. The default value of [] implies that the value is equal to NStartGrid of carrier input argument.

NumLayers

1 (default), integer from 1 to 4

Number of transmission layers

MappingType

'A' (default), 'B'

Mapping type of PUSCH

SymbolAllocation

[0 14] (default), two-element vector of nonnegative integers

OFDM symbols allocated for PUSCH

PRBSet

[0:51] (default), vector of nonnegative integers from 0 to 274

PRBs allocated for PUSCH within the BWP

TransformPrecoding

0 (default), 1

Transform precoding flag, specified as one of these values.

  • 0 — The transform precoding is disabled and waveform type is CP-OFDM.

  • 1 — The transform precoding is enabled and waveform type is DFT-s-OFDM.

TransmissionScheme

'nonCodebook' (default), 'codebook'

PUSCH transmission scheme

NumAntennaPorts

1 (default), 2, or 4

Number of antenna ports. The value must be greater than or equal to NumLayers. This property is applicable only, when TransmissionScheme is set to 'codebook'.

FrequencyHopping

'neither (default), 'intraSlot', or 'interSlot'

Frequency hopping mode for PUSCH

SecondHopStartPRB

1 (default), integer from 0 to 274

Starting PRB index of second hop relative to NStartBWP

RNTI

1 (default), integer from 0 to 65,535

Radio network temporary identifier of the user equipment

DMRS

nrPUSCHDMRSConfig configuration object

DMRS configuration object only uses these properties.

  • DMRSConfigurationType

  • DMRSTypeAPosition

  • DMRSLength

  • DMRSAdditionalPosition

  • CustomSymbolSet

  • DMRSPortSet

For more information, see nrPUSCHDMRSConfig.

EnablePTRS

0 (default), 1

PT-RS configuration, specified as one of these values.

  • 0 — Disable PT-RS configuration.

  • 1 — Enable PT-RS configuration.

PTRS

nrPUSCHPTRSConfig configuration object

PTRS configuration object uses these properties.

  • TimeDensity

  • These properties are applicable only when TransformPrecoding is set to zero.

    • FrequencyDensity

    • REOffset

    • PTRSPortSet

  • These properties are applicable only when TransformPrecoding is set to one.

    • NumPTRSSamples

    • NumPTRSGroups

For more information, see nrPUSCHPTRSConfig.

Name-Value Pair Arguments

Specify optional comma-separated pairs of Name,Value arguments. Name is the argument name and Value is the corresponding value. Name must appear inside quotes. You can specify several name and value pair arguments in any order as Name1,Value1,...,NameN,ValueN.

Example: 'IndexStyle','subscript','IndexBase','0based' specifies the RE indexing form and base, respectively, of the output.

Resource element indexing form, specified as the comma-separated pair consisting of 'IndexStyle' and one of these values:

  • 'index' — The indices are in linear index form.

  • 'subscript' — The indices are in [subcarrier, symbol, antenna] subscript row form.

Data Types: char | string

Resource element indexing base, specified as the comma-separated pair consisting of 'IndexBase' and one of these values:

  • '1based' — The index counting starts from one.

  • '0based' — The index counting starts from zero.

Data Types: char | string

Resource element indexing orientation, specified as the comma-separated pair consisting of 'IndexOrientation' and one of these values:

  • 'carrier' — Indices are referenced with respect to carrier grid.

  • 'bwp' — Indices are referenced with respect to bandwidth part.

Dependencies

This property is applicable only when TransformPrecoding is set to 0.

Data Types: char | string

Output Arguments

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PT-RS resource element indices, returned as one of these values.

  • N-by-P matrix — The function returns this type of value when 'IndexStyle' is set to 'index'. The number of columns depends on the TransmissionScheme and TransformPrecoding properties of nrPUSCHConfig object and returned as one these values.

    • Number of PT-RS antenna ports configured — When transform precoding is disabled and transmission scheme is non-codebook.

    • Number of antenna ports configured — When transform precoding is disabled and transmission scheme is codebook.

    • Number of transmission layers — When transform precoding is enabled.

  • M-by-3 matrix — The function returns this type of value when 'IndexStyle' is set to 'subscript'. The matrix rows correspond to the [subcarrier, symbol, antenna] subscripts based on the number of subcarriers, OFDM symbols, and number of antennas, respectively.

Depending on the value of 'IndexBase', the function returns either 1-based or 0-based indices. Depending on the value of 'IndexOrientation', the function returns either carrier oriented indices or BWP oriented indices. This index orientation is applicable only when TransformPrecoding is set to 0. For DFT-s-OFDM, the indices are relative to the shared channel allocation.

Data Types: uint32

References

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

Extended Capabilities

Introduced in R2020a