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nrPUSCHPTRS

Generate PUSCH PT-RS symbols

Description

example

sym = nrPUSCHPTRS(carrier,pusch) returns sym in matrix form, which contains phase tracking reference signal (PT-RS) symbols of physical uplink shared channel (PUSCH), as defined in TS 38.211 Section 6.4.1.2.1 [1]. The number of columns in sym 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.

example

sym = nrPUSCHPTRS(___,'OutputDataType',datatype) specifies the data type of output PT-RS symbols sym, in addition to the input arguments in the previous syntax.

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, transmitted precoding matrix indicator to 5, frequency density to 4, and resource element offset to '11'. 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.TPMI = 5;
pusch.EnablePTRS = 1;
pusch.PTRS.FrequencyDensity = 4;
pusch.PTRS.REOffset = '11';

Generate PUSCH PT-RS symbols of data type single.

sym = nrPUSCHPTRS(carrier,pusch,'OutputDataType','single')
sym = 169x4 single matrix

  -0.3536 + 0.3536i   0.0000 + 0.0000i   0.3536 - 0.3536i   0.0000 + 0.0000i
  -0.3536 + 0.3536i   0.0000 + 0.0000i   0.3536 - 0.3536i   0.0000 + 0.0000i
   0.3536 + 0.3536i   0.0000 + 0.0000i  -0.3536 - 0.3536i   0.0000 + 0.0000i
  -0.3536 - 0.3536i   0.0000 + 0.0000i   0.3536 + 0.3536i   0.0000 + 0.0000i
  -0.3536 - 0.3536i   0.0000 + 0.0000i   0.3536 + 0.3536i   0.0000 + 0.0000i
  -0.3536 + 0.3536i   0.0000 + 0.0000i   0.3536 - 0.3536i   0.0000 + 0.0000i
  -0.3536 + 0.3536i   0.0000 + 0.0000i   0.3536 - 0.3536i   0.0000 + 0.0000i
  -0.3536 - 0.3536i   0.0000 + 0.0000i   0.3536 + 0.3536i   0.0000 + 0.0000i
   0.3536 - 0.3536i   0.0000 + 0.0000i  -0.3536 + 0.3536i   0.0000 + 0.0000i
   0.3536 - 0.3536i   0.0000 + 0.0000i  -0.3536 + 0.3536i   0.0000 + 0.0000i
      ⋮

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.

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

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

Data Types: char | string

Output Arguments

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PT-RS symbols, returned as a complex matrix. The number of columns depends on the TransmissionScheme and TransformPrecoding properties of nrPUSCHConfig object.

The number of columns in sym is 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.

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

Version History

Introduced in R2020a