lteNPBCHIndices

Generate NPBCH RE indices

Syntax

[ind,info] = lteNPBCHIndices(enb)

[ind,info] = lteNPBCHIndices(enb,opts)

Description

[ind,info] = lteNPBCHIndices(enb) generates ind, a matrix containing narrowband physical broadcast channel (NPBCH) resource element (RE) indices, and info, a structure containing information related to the indices. You can use ind to index elements of the subframe resource grid directly for all antenna ports in accordance with section 10.2.4.4 of [1]. Initialize this function with cell-wide settings enb.

[ind,info] = lteNPBCHIndices(enb,opts) formats the returned indices using options specified by opts.

Examples

Generate NPBCH RE Indices and Info Structure

Generate the NPBCH RE Indices mapping for one antenna and display related information.

Create the eNodeB structure cell-wide settings for one antenna.

enb.NNCellID=10;
enb.NBRefP=1;

Generate the NPBCH RE Indices column vector. Display the first 10 indices.

[ind,info]=lteNPBCHIndices(enb);
ind(1:10)

ans = 10×1

    37
    38
    39
    40
    41
    42
    43
    44
    45
    46

Display the fields contained in the info structure.

info.G

ans = 
1600

info.Gd

ans = 
800

Generate NPBCH Indices

Generate NPBCH RE 0-based Indices in linear index form for two antennas.

Create eNodeB structure cell-wide settings for two antennas.

enb.NNCellID = 10;
enb.NBRefP = 2;

Generate the 0-based NPBCH RE indices in linear index form. The indices matrix has two columns, one for each antenna port. Display the first 10 indices.

[ind,info] = lteNPBCHIndices(enb,{'0based', 'ind'});
ind(1:10,:)

ans = 10×2

    36   204
    37   205
    38   206
    39   207
    40   208
    41   209
    42   210
    43   211
    44   212
    45   213

Display the fields contained in the info structure.

info.G

ans = 
1600

info.Gd

ans = 
800

Input Arguments

enb — Cell-wide settings

structure

Cell-wide settings, specified as a structure containing these fields.

Parameter Field	Required or Optional	Values	Description	Data Types
NNCellID	Required	Nonnegative integer	NB-IoT physical layer cell identity	double
NBRefP	Required	1, 2	Number of narrowband reference signal antenna ports	double
NSubframe	Optional	0 (default), nonnegative integer	Subframe number	double
NFrame	Optional	0 (default), nonnegative integer	Frame number	double

Data Types: struct

opts — Output format and index base of generated indices

character vector | string scalar | cell array of character vectors | string array

Output format and index base of generated indices, specified as one of these forms.

• 'format base'

• "format base"

• {'format','base'}

• ["format","base"]

Where format and base are defined in this table.

Option	Values	Description
format	'ind' (default), 'sub'	Output format of generated indices To return the indices as a column vector, specify this option as 'ind'. To return the indices as an NRE-by-3 matrix, where NRE is the number of REs, specify this option as 'sub'. Each row of the matrix contains the subcarrier, symbol, and antenna port as its first, second, and third element, respectively.
base	'1based' (default), '0based'	Index base To generate indices whose first value is 1, specify this option as '1based'. To generate indices whose first value is 0, specify this option as '0based'.

Example: 'ind 0based', "ind 0based", {'ind','0based'}, and ["ind","0based"] specify the same output options.

Data Types: char | string | cell

Output Arguments

ind — NPBCH RE indices

real-valued matrix

NPBCH RE indices, returned as a real-valued matrix, depending on the indexing style specified in opts:

• If you specify linear indexing (default), then ind is an 100-by-NBRefP matrix.

• If you specify subscript row style indexing, then ind is an N_RE-by-3 matrix, where N_RE is the number of resource elements per subframe.

Data Types: double

info — Information related to NPBCH indices

structure

Information related to NPBCH indices, returned as a structure containing these fields.

Parameter Field	Values	Description	Data Types
G	1600	Number of coded and rate-matched NPBCH data bits for a codeword.	double
Gd	800	Number of coded and rate-matched NPBCH data symbols for each of the 8 sub blocks.	double

Data Types: struct

References

[1] 3GPP TS 36.211. “Physical channels and modulation (Release 14).” 3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (E-UTRA). URL: https://www.3gpp.org.

Version History

Introduced in R2019b