nrPDCCH

Generate PDCCH modulation symbols

Syntax

sym = nrPDCCH(dcicw,nid,nrnti)

sym = nrPDCCH(___,'OutputDataType',datatype)

Description

sym = nrPDCCH(dcicw,nid,nrnti) returns the physical downlink control channel (PDCCH) modulation symbols, as defined in TS 38.211 Section 7.3.2 [1]. dcicw is the encoded downlink control information (DCI) codeword, as specified in TS 38.212 Section 7.3 [2]. The generation process consists of scrambling the input DCI codeword with scrambling identity nid, and QPSK symbol modulation. nrnti specifies the user equipment (UE).

sym = nrPDCCH(___,'OutputDataType',datatype) specifies the PDCCH symbol data type in addition to the input arguments in the previous syntax.

Examples

Generate PDCCH Modulation Symbols Using DMRS Scrambling Identity

Specify a random sequence of binary values corresponding to a DCI codeword of 560 bits. Generate modulation symbols by scrambling with the PDCCH demodulation reference signal (DMRS) scrambling identity.

dcicw = randi([0 1],560,1);     
nid = 2^11;                   % pdcch-DMRS-ScramblingID
nrnti = 123;                  % C-RNTI
sym = nrPDCCH(dcicw,nid,nrnti)

sym = 280×1 complex

   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 PDCCH Modulation Symbols Using NcellID for Scrambling

Specify a random sequence of binary values corresponding to a DCI codeword of 560 bits. Generate PDCCH modulation symbols by setting the scrambling identity to the physical layer cell identity (NcellID).

dcicw = randi([0 1],560,1);     
nid = 123;                    % NcellID (0 to 1007)
nrnti = 0;  
sym = nrPDCCH(dcicw,nid,nrnti)

sym = 280×1 complex

  -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
      ⋮

Input Arguments

dcicw — Encoded DCI codeword

column vector of binary values

Encoded DCI codeword, specified as a column vector of binary values.

Data Types: double | int8 | logical

nid — Scrambling identity

integer from 0 to 65,535

Scrambling identity, specified as an integer from 0 to 65,535. Specify with nid the physical layer cell identity number, ranging from 0 to 1007, or higher layer parameter pdcch-DMRS-ScramblingID, ranging from 0 to 65,535. For more information on these values, see TS 38.211 Section 7.3.2.3 and 7.4.1.3.

Data Types: double

nrnti — UE identifier

integer from 0 to 65,519

UE identifier, specified as an integer from 0 to 65,519.

• If nid is the PDCCH DMRS scrambling identity, nrnti is the cell radio network temporary identifier (C-RNTI) in a UE-specific search space.

• If nid is the physical layer cell identity, nrnti is 0.

For more information, TS 38.211 Section 7.3.2.3 and 7.4.1.3.

Data Types: double

datatype — Data type of output symbols

'double' (default) | 'single'

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

Data Types: char | string

Output Arguments

sym — PDCCH modulation symbols

complex column vector

PDCCH modulation symbols, returned as a complex column vector.

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.

[2] 3GPP TS 38.212. “NR; Multiplexing and channel coding.” 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 R2018b

R2020b: Updates to upper limit of UE identifier

Starting in R2020b, the upper limit of UE identifier nrnti is 65,519 instead of 65,535.