nrPDCCH

Generate PDCCH modulation symbols

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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).

example

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

Examples

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Open Live Script

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
  -0.7071 + 0.7071i
   0.7071 - 0.7071i
   0.7071 - 0.7071i
   0.7071 - 0.7071i
  -0.7071 - 0.7071i
      ⋮
Open Live Script

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
   0.7071 + 0.7071i
   0.7071 - 0.7071i
   0.7071 + 0.7071i
   0.7071 + 0.7071i
  -0.7071 - 0.7071i
      ⋮

Input Arguments

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

Data Types: double | int8 | logical

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

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

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

Data Types: char | string

Output Arguments

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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

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Version History

Introduced in R2018b

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See Also

Functions