Main Content

nrPRACHGrid

Generate PRACH resource grid

Since R2020a

Description

grid = nrPRACHGrid(carrier,prach) returns the physical random access channel (PRACH) resource grid for one antenna. The input carrier specifies carrier configuration parameters for a specific OFDM numerology. The input prach specifies PRACH configuration parameters.

example

grid = nrPRACHGrid(carrier,prach,p) returns the PRACH resource grid for p antennas.

grid = nrPRACHGrid(___,'OutputDataType',datatype) specifies the resource grid symbol data type in addition to the input arguments in any of the previous syntaxes.

Examples

collapse all

Configure the PRACH and the carrier with default properties.

carrier = nrCarrierConfig;
prach = nrPRACHConfig;

Generate PRACH symbols and indices using the specified carrier and PRACH configuration parameters.

prachSym = nrPRACH(carrier,prach);
prachInd = nrPRACHIndices(carrier,prach);

Generate a PRACH resource grid of all zeros.

prachGrid = nrPRACHGrid(carrier,prach);

Map the PRACH symbols to the PRACH resource grid by using the indices.

prachGrid(prachInd) = prachSym;

Input Arguments

collapse all

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

PRACH configuration parameters, specified as an nrPRACHConfig object. The function uses only these properties of this input.

Number of antennas, specified as a positive integer.

Data type of the output symbols, specified as 'double' or 'single'.

Data Types: char | string

Output Arguments

collapse all

PRACH resource grid, returned as a K-by-L or K-by-L-by-p complex array of all zeros.

  • K is equal to (carrier.SubcarrierSpacing / prach.SubcarrierSpacing) × carrier.NSizeGrid × 12

  • L is the number of OFDM symbols and depends on the PRACH format.

    • For long formats, L = prach.PRACHDuration.

    • For short format C0, L = 7.

    • For all other short formats, L = 14.

      For more information on PRACH preamble formats, see TS 38.211 Tables 6.3.3.1-1 and 6.3.3.1-2.

Data Types: double | single

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

See Also

Functions

Objects