nrPDCCHResources

R2026b

Generate PDCCH and PDCCH DM-RS resources

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Syntax

ind = nrPDCCHResources(carrier,pdcch)
[ind,dmrsSym,dmrsInd] = nrPDCCHResources(carrier,pdcch)
[ind,dmrsSym,dmrsInd] = nrPDCCHResources(carrier,pdcch,Name=Value)

Description

The nrPDCCHResources function returns physical downlink control channel (PDCCH) resource element indices and PDCCH demodulation reference signal (DM-RS) symbols and resource element indices.

ind = nrPDCCHResources(carrier,pdcch) returns PDCCH resource element indices ind, as defined in TS 38.211 Section 7.3.2 [1]. The input carrier specifies carrier configuration parameters for a specific OFDM numerology. The input pdcch specifies PDCCH configuration parameters.

example

[ind,dmrsSym,dmrsInd] = nrPDCCHResources(carrier,pdcch) also returns PDCCH DM-RS symbols dmrsSym and PDCCH DM-RS resource element indices dmrsInd, as defined in TS 38.211 Section 7.4.1.3.

example

[ind,dmrsSym,dmrsInd] = nrPDCCHResources(carrier,pdcch,Name=Value) specifies output formatting options using one or more name-value arguments. For example, IndexStyle="subscript" specifies the indices are in [subcarrier, symbol, antenna] subscript row form.

example

Examples

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Open Live Script

Configure the carrier and the PDCCH with default configuration parameters. 

carrier = nrCarrierConfig;
pdcch = nrPDCCHConfig;

Generate PDCCH symbols for a random DCI codeword by using PDCCH configuration parameters for scrambling and identifying the UE.

dciCW = randi([0 1],864,1);
sym = nrPDCCH(dciCW,pdcch.DMRSScramblingID,pdcch.RNTI);

Generate PDCCH resource element indices by using the specified carrier and PDCCH objects.

ind = nrPDCCHResources(carrier,pdcch);

Create a grid for mapping PDCCH symbols to the grid. 

cgrid = zeros(12*carrier.NSizeGrid,carrier.SymbolsPerSlot);

Map PDCCH symbols to the grid.

cgrid(ind) = sym;
Open Live Script

Configure the carrier with default configuration parameters. 

carrier = nrCarrierConfig;

Configure the CORESET with 6 frequency resources, a duration of 3 OFDM symbols, and a REG bundle size of 3.

crst = nrCORESETConfig;
crst.FrequencyResources = ones(1,6);
crst.Duration = 3;
crst.REGBundleSize = 3;

Configure the PDCCH with the specified bandwidth part and CORESET.

pdcch = nrPDCCHConfig;
pdcch.NStartBWP = 6;
pdcch.NSizeBWP = 36;
pdcch.CORESET = crst;
pdcch.AggregationLevel = 16;

Generate PDCCH DM-RS symbols and indices for the specified carrier and PDCCH.

[~,dmrs,dmrsInd] = nrPDCCHResources(carrier,pdcch);
Open Live Script

Configure a carrier grid of 60 resource blocks (RBs), where the starting RB index relative to the common resource block 0 (CRB 0) is 3. 

carrier = nrCarrierConfig;
carrier.NStartGrid = 3;
carrier.NSizeGrid = 60;

Configure noninterleaved CORESET with 6 frequency resources and a duration of 3 OFDM symbols.

crst = nrCORESETConfig;
crst.FrequencyResources = ones(1,6);
crst.Duration = 3;
crst.CCEREGMapping = "noninterleaved";

Configure the PDCCH with the specified bandwidth part and CORESET.

pdcch = nrPDCCHConfig;
pdcch.NStartBWP = 5;
pdcch.NSizeBWP = 48;
pdcch.CORESET = crst;
pdcch.AggregationLevel = 16;

Generate PDCCH resource element indices and DM-RS symbol indices using 1-based, subscript indexing form relative to the BWP grid.

[ind,~,dmrsInd] = nrPDCCHResources(carrier,pdcch,...
    IndexOrientation="bwp",IndexStyle="subscript");

Input Arguments

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Carrier configuration parameters for a specific OFDM numerology, specified as an nrCarrierConfig object.

PDCCH configuration parameters, specified as an nrPDCCHConfig object.

Name-Value Arguments

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Specify optional pairs of arguments as Name1=Value1,...,NameN=ValueN, where Name is the argument name and Value is the corresponding value. Name-value arguments must appear after other arguments, but the order of the pairs does not matter.

Example: IndexStyle="subscript" specifies indices are in [subcarrier, symbol, antenna] subscript row form.

RE indexing form, specified as 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

RE indexing base, specified as one of these values:

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

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

Data Types: char | string

Indexing orientation of PDCCH and DM-RS resource elements, specified as one of these values:

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

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

Data Types: char | string

Data type of PDCCH DM-RS symbols, specified as one of these values:

  • 'double' — Output symbols are of double data type.

  • 'single' — Output symbols are of single data type.

Data Types: char | string

Output Arguments

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PDCCH resource element indices, returned as one of these values:

  • M-by-1 vector — When IndexStyle is set to 'index'.

  • M-by-3 matrix — 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.

M depends on the aggregation level of the PDCCH and is equal to pdcch.AggregationLevel × 6 × 12 × 3 / 4.

Depending on the value of IndexBase, the indices are either 1-based or 0-based.

Data Types: uint32

DM-RS symbols, returned as an N-by-1 complex vector. N depends on the aggregation level of the PDCCH and is equal to pdcch.AggregationLevel × 6 × 12 × 1 / 4.

Data Types: single | double

DM-RS resource element indices, returned as one of these values:

  • N-by-1 vector — When IndexStyle is set to 'index'.

  • N-by-3 matrix — 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.

N depends on the aggregation level of the PDCCH and is equal to pdcch.AggregationLevel × 6 × 12 × 1 / 4.

Depending on the value of IndexBase, the indices are either 1-based or 0-based.

Data Types: uint32

References

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

[2] 3GPP TS 38.213. “NR; Physical layer procedures for control.” 3rd Generation Partnership Project; Technical Specification Group Radio Access Network.

Extended Capabilities

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Version History

Introduced in R2020a

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See Also

Functions

Objects

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