nrPDSCHPRBS

R2026b

Generate PDSCH scrambling sequence

Syntax

[seq,cinit] = nrPDSCHPRBS(nid,rnti,q,n)

[seq,cinit] = nrPDSCHPRBS(nid,rnti,q,n,Name=Value)

Description

[seq,cinit] = nrPDSCHPRBS(nid,rnti,q,n) returns the first n elements of the physical downlink shared channel (PDSCH) scrambling sequence. The function also returns the initialization value cinit of the pseudorandom binary sequence (PRBS) generator. The initialization value depends on the scrambling identity number nid, the radio network temporary identifier (RNTI) of the user equipment (UE) rnti, and the codeword number q. The function implements TS 38.211 Section 7.3.1.1 [1].

[seq,cinit] = nrPDSCHPRBS(nid,rnti,q,n,Name=Value) specifies additional output formatting options by using one or more name-value arguments. Unspecified options take their default values. For example, MappingType="signed" specifies nondefault sequence formatting.

Examples

Generate PDSCH Scrambling Sequence

Generate the first 300 outputs of the PDSCH scrambling sequence when initialized with the specified physical layer cell identity number, RNTI, and codeword number.

 ncellid = 17;
 rnti = 120;
 q = 0;
 n = 300;
 seq = nrPDSCHPRBS(ncellid,rnti,q,n)

seq = 300×1 logical array

   0
   1
   1
   0
   1
   1
   0
   1
   0
   0
   0
   0
   1
   1
   1
      ⋮

Input Arguments

nid — Scrambling identity

integer

Scrambling identity, specified as an integer from 0 to 1023. nid is the physical layer cell identity number (0 to 1007) or higher layer parameter dataScramblingIdentityPDSCH (0 to 1023). For more information, see TS 38.331 Section 6.3.2.

Data Types: double

rnti — RNTI of UE

integer from 0 to 65,535

RNTI of the UE, specified as an integer from 0 to 65,535.

Data Types: double

q — Codeword number

0 | 1

Codeword number, specified as 0 or 1.

Data Types: double

n — Number of elements in output sequence

nonnegative integer

Number of elements in output sequence, specified as a nonnegative integer.

Data Types: double

Name-Value Arguments

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: MappingType="signed" specifies nondefault sequence formatting.

MappingType — Output sequence formatting

'binary' (default) | 'signed'

Output sequence formatting, specified as one of these values:

• 'binary' — This value maps true to 1 and false to 0. The data type of the output sequence is logical.

• 'signed' — This value maps true to –1 and false to 1. The data type of the output sequence is double. To specify single data type, use the OutputDataType name-value argument.

Data Types: char | string

OutputDataType — Data type of output sequence

'double' (default) | 'single'

Data type of output sequence, specified as 'double' or 'single'. This name-value argument applies only when MappingType is set to 'signed'.

Data Types: char | string

Output Arguments

seq — PDSCH scrambling sequence

logical column vector | numeric column vector

PDSCH scrambling sequence, returned as a logical or numeric column vector. seq contains the first n elements of the PDSCH scrambling sequence. If you set MappingType to 'signed', the output data type is either double or single. If you set MappingType to 'binary', the output data type is logical.

Data Types: double | single | logical

cinit — Initialization value for PRBS generator

nonnegative integer

Initialization value for PRBS generator, returned as a nonnegative integer.

Data Types: double

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:

Names and values in name-value arguments must be compile-time constants. 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.

GPU Code Generation

Generate CUDA® code for NVIDIA® GPUs using GPU Coder™.

Refer to the usage notes and limitations in the C/C++ Code Generation section. The same usage notes and limitations apply to GPU code generation.

Version History

Introduced in R2018b