nrPUSCHDMRS
Description
returns a matrix containing demodulation reference signal (DM-RS) symbols of physical uplink
shared channel (PUSCH), as defined in TS 38.211 Section 6.4.1.1.1 [1]. sym
= nrPUSCHDMRS(carrier
,pusch
)carrier
specifies the carrier configuration parameters for a specific OFDM numerology.
pusch
specifies the PUSCH configuration parameters.
Examples
Generate PUSCH DM-RS Symbols for CP-OFDM
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 physical uplink shared channel (PUSCH) configuration object with specified properties. When transform precoding is set to 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 = 0;
Configure PUSCH demodulation reference signal (DM-RS) with specified parameters.
pusch.DMRS.DMRSAdditionalPosition = 1; pusch.DMRS.DMRSTypeAPosition = 2; pusch.DMRS.DMRSPortSet = 2; pusch.DMRS.NIDNSCID = 10; pusch.DMRS.NSCID = 1;
Generate DM-RS symbols associated with PUSCH of single
data type.
sym = nrPUSCHDMRS(carrier,pusch,'OutputDataType','single')
sym = 624x4 single matrix
-0.3536 - 0.3536i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i
0.3536 - 0.3536i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i
-0.3536 + 0.3536i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i
-0.3536 - 0.3536i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i
-0.3536 + 0.3536i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i
0.3536 - 0.3536i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i
-0.3536 - 0.3536i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i
0.3536 + 0.3536i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i
0.3536 - 0.3536i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i
0.3536 - 0.3536i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i
⋮
Generate PUSCH DM-RS Symbols and Indices
Create a carrier configuration with 30 kHz subcarrier spacing and 5 MHz transmission bandwidth.
carrier = nrCarrierConfig; carrier.SubcarrierSpacing = 30; carrier.NSizeGrid = 11;
Create a physical uplink shared channel (PUSCH) configuration object with specified properties. When transform precoding is set to 1, the waveform type is discrete fourier transform spread orthogonal frequency division multiplexing (DFT-s-OFDM).
pusch = nrPUSCHConfig;
pusch.NSizeBWP = 9;
pusch.NStartBWP = 1;
pusch.PRBSet = 0:3;
pusch.TransformPrecoding = 1;
pusch.FrequencyHopping = 'intraSlot';
pusch.SecondHopStartPRB = 5;
Create a PUSCH demodulation reference signal (DM-RS) object with specified properties.
dmrs = nrPUSCHDMRSConfig; dmrs.DMRSAdditionalPosition = 1; dmrs.DMRSTypeAPosition = 2; dmrs.DMRSPortSet = 3; dmrs.GroupHopping = 1; dmrs.SequenceHopping = 0; dmrs.NRSID = 10;
Assign the PUSCH DM-RS configuration object to DMRS property of PUSCH configuration object.
pusch.DMRS = dmrs;
Generate PUSCH DM-RS symbols and indices for the specified carrier, PUSCH configuration, and output formatting name-value
pair argument.
sym = nrPUSCHDMRS(carrier,pusch,'OutputDataType','single')
sym = 96x1 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
⋮
ind = nrPUSCHDMRSIndices(carrier,pusch,'IndexBase','0based','IndexOrientation','bwp')
ind = 96x1 uint32 column vector
217
219
221
223
225
227
229
231
233
235
⋮
Create a bandwidth part (BWP) grid, and then map the DM-RS symbols on the grid.
bwp = complex(zeros([pusch.NSizeBWP*12 carrier.SymbolsPerSlot pusch.NumLayers]));
bwp(ind+1) = sym; % Map the DM-RS symbols
Map the BWP to the carrier resource grid, and then display the carrier grid.
grid = complex(zeros([carrier.NSizeGrid*12 carrier.SymbolsPerSlot pusch.NumLayers])); % Create carrier resource grid offset = pusch.NStartBWP-carrier.NStartGrid; % BWP start location in the carrier grid grid(offset*12+1:(offset+pusch.NSizeBWP)*12,:,:) = bwp; imagesc(abs(grid(:,:,1))); axis xy; xlabel('OFDM Symbols'); ylabel('Subcarriers'); title('PUSCH DM-RS Resource Elements in the Carrier Resource Grid');
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.
pusch
— PUSCH configuration parameters
nrPUSCHConfig
object
PUSCH configuration parameters, specified as an nrPUSCHConfig
object. This
function uses only these properties of the nrPUSCHConfig
object.
For
operation with shared spectrum channel access for frequency range 1 (FR1), set the Interlacing
property to true
, then use the
RBSetIndex
and InterlaceIndex
object properties to specify the allocated frequency
resources. (since R2023b)
datatype
— Data type for generated DM-RS symbols
'double'
(default) | 'single'
Data type for the generated DM-RS symbols, specified as 'double'
or 'single'
.
Data Types: char
| string
Output Arguments
sym
— DM-RS symbols
complex matrix
DM-RS symbols, returned as a complex matrix. The number of columns correspond to the number of antenna ports configured.
Data Types: single
| double
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 R2020aR2024a: Release 18 support for eight antenna ports, up to eight layers, and two codewords
The Modulation
, NumLayers
, NumAntennaPorts
, TPMI
, and CodebookType
object properties of the pusch
input add support to eight antenna ports, up to eight layers, and two codewords in PUSCH
transmissions.
R2023b: Configure intracell guard bands
Use the IntraCellGuardBands
object property of the carrier
input
to specify intracell guard bands.
R2023b: Support for release 16 interlacing for operation in unlicensed spectrum (NR-U)
Use the Interlacing
, RBSetIndex
, and InterlaceIndex
properties of the pusch
input
argument to configure interlaced PUSCH transmissions.
See Also
Functions
Objects
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