nrPBCHDMRS

Generate PBCH DM-RS symbols

Syntax

sym = nrPBCHDMRS(ncellid,ibar_SSB)

sym = nrPBCHDMRS(ncellid,ibar_SSB,'OutputDataType',datatype)

Description

sym = nrPBCHDMRS(ncellid,ibar_SSB) returns the physical broadcast channel (PBCH) demodulation reference signal (DM-RS) symbols for the physical layer cell, identified by ncellid. The ibar_SSB input specifies the time-dependent part of the DM-RS scrambling initialization. The function implements TS 38.211 Section 7.4.1.4.1 [1].

sym = nrPBCHDMRS(ncellid,ibar_SSB,'OutputDataType',datatype) specifies the data type of the DM-RS symbol.

Examples

Generate PBCH DM-RS Symbols

Generate the sequence of 144 PBCH DM-RS symbols associated with the third SS block (i_SSB = 2) in the second half frame (n_hf = 1) of a frame.

ncellid = 17;
i_SSB = 2;
n_hf = 1;
ibar_SSB = i_SSB + (4*n_hf);

dmrs = nrPBCHDMRS(ncellid,ibar_SSB);

Input Arguments

ncellid — Physical layer cell identity number

integer

Physical layer cell identity number, specified as an integer from 0 to 1007.

Data Types: double

ibar_SSB — Time-dependent part of DM-RS scrambling initialization

integer from 0 to 7 (default)

Time-dependent part of the DM-RS scrambling initialization, specified as an integer from 0 to 7. ibar_SSB is derived in a synchronization signal (SS) burst configuration, from the least significant bits (LSBs) of the SS/PBCH block index and the half-frame number.

• If the number of SS/PBCH blocks per half-frame is 4, ibar_SSB = i_SSB + 4 × n_hf, where i_SSB is the two LSBs of the SS/PBCH block index (0 to 3). n_hf is the half-frame number within the frame (0,1).

• If the number of SS/PBCH blocks per half-frame is 8 or 64, ibar_SSB is the three LSBs of the SS/PBCH block index (0 to 7).

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 — PBCH DM-RS symbols

complex column vector

PBCH DM-RS symbols, returned as a complex column vector.

Data Types: single | 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:

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