lteNSSSIndices

Generate NSSS RE indices for subframe

Description

ind = lteNSSSIndices(enb) generates ind, the narrowband secondary synchronization signal (NSSS) resource element (RE) indices for cell-wide settings enb.

ind = lteNSSSIndices(enb,port) generates the NSSS RE indices for the antenna port corresponding to the port input.

example

ind = lteNSSSIndices(enb,port,opts) generates the NSSS RE indices for the specified antenna port in the format specified by opts.

Examples

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Generate zero-based NSSS RE indices for antenna port 2001.

Initialize cell-wide settings by specifying the operation mode, number of cell-specific RS antenna ports, physical layer cell identity, frame number, and subframe number.

enb.OperationMode = 'Inband-SamePCI';    % Operation mode
enb.CellRefP = 1;                        % Number of cell-specific RS antenna ports
enb.NCellID = 2;                         % Physical layer cell identity
enb.NSubframe = 9;                       % Subframe number
enb.NFrame = 4;                          % Frame number

Specify the antenna port and generate the NSSS RE indices, specifying zero-based indexing. To return a matrix whose rows each contain the subcarrier, index, and antenna port of the corresponding RE, specify the option 'sub'.

port = 1;
ind = lteNSSSIndices(enb,port,{'0based','sub'});

Input Arguments

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

NameRequired or OptionalValuesDescriptionData Types
OperationModeOptional'Standalone' (default), 'Inband-SamePCI', 'Inband-DifferentPCI', 'Guardband'

NB-IoT operation mode, specified as one of these values:

  • 'Standalone' – NB-IoT standalone operation within any 180-kHz band outside any LTE carrier bandwidth

  • 'Inband-SamePCI' – NB-IoT in-band operation with the same physical layer cell identity (PCI) as an LTE carrier

  • 'Inband-DifferentPCI' – NB-IoT in-band operation with a different PCI to an LTE carrier

  • 'Guardband' – NB-IoT guard-band operation utilizing unused resource blocks within the guard-band of an LTE carrier

char, string
NSubframeOptional9 (default), integerSubframe number. Because the NSSS is defined only for subframe 9 in alternate frames, lteNSSSIndices returns an empty array for any value of NSubframe other than 9. This behavior enables resource grid indexing for any subframe number.double
NFrameOptional0 (default), integerFrame number. Because the NSSS is defined only for subframe 9 in alternate frames, lteNSSSIndices returns an empty vector for odd values of NFrame. This behavior enables resource grid indexing for any subframe number and any frame number. If the NSubframe and NFrame fields are unspecified, lteNSSSIndices assumes NFrame takes its default value.double
NCellIDRequired when you specify OperationMode as 'Inband-SamePCI' or 'Inband-DifferentPCI'Integer in the interval [0, 503]PCIdouble
CellRefPRequired when you specify OperationMode as 'Inband-SamePCI' or 'Inband-DifferentPCI'1, 2, 4Number of cell-specific antenna portsdouble

Note

Specify the NCellID and CellRefP fields to exclude cell reference signal (RS) locations. If you do not specify both the NCellID and CellRefP fields, all cell RS locations are included.

Data Types: struct

Antenna port, specified as 0 or 1, corresponding to antenna port 2000 or 2001, respectively.

Data Types: double

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.

OptionValuesDescription
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

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NSSS RE indices for a subframe, returned as a complex-valued array. The array dimensions depend on the format options you specify in opts. To return ind as a column vector, specify 'ind' in the opts input. To return ind as an NRE-by-3 matrix, specify 'sub' in the opts input. If you specify the NSubframe field as a value other than 9 or the NFrame field as an odd value, the lteNSSSIndices function returns ind as an empty array.

Data Types: uint32

Introduced in R2019a