lteNPUSCHIndices

Generate NPUSCH RE indices

Syntax

[ind,info] = lteNPUSCHIndices(ue,chs)

[ind,info] = lteNPUSCHIndices(ue,chs,opts)

Description

[ind,info] = lteNPUSCHIndices(ue,chs) generates ind, a column vector of narrowband physical uplink shared channel (NPUSCH) resource element (RE) indices, and info, information related to the indices. The function generates indices for mapping NPUSCH symbols to physical resources, as specified in Section 10.1.3.6 of [1], for user equipment (UE) settings ue and channel transmission configuration chs.

[ind,info] = lteNPUSCHIndices(ue,chs,opts) specifies opts, the format in which the function returns the NPUSCH RE indices.

Examples

Generate NPUSCH RE Indices

Configure UE-specific settings.

ue = struct('NBULSubcarrierSpacing','15kHz');

Specify a channel transmission configuration.

chs =  struct('NPUSCHFormat','Data','NBULSubcarrierSet',[0:11],'NRU',1, ...
    'NULSlots',2,'Modulation','BPSK');

Generate the NPUSCH RE indices for the specified settings. Display the corresponding information.

[ind,info] = lteNPUSCHIndices(ue,chs);
disp(info)

    Gd: 144
     G: 144

Generate Zero-Based NPUSCH RE Indices

Configure UE-specific settings.

ue = struct('NBULSubcarrierSpacing','15kHz');

Specify a channel transmission configuration.

chs =  struct('NPUSCHFormat','Data','NBULSubcarrierSet',0:11, ...
    'NRU',1,'NULSlots',2,'Modulation','BPSK');

Generate the NPUSCH RE indices, specifying zero-based formatting.

[ind,info] = lteNPUSCHIndices(ue,chs,'0based');

Input Arguments

ue — UE-specific settings

structure

UE-specific settings, specified as a structure containing this field.

Field	Values	Description	Data Types
NBULSubcarrierSpacing	'3.75kHz', '15kHz'	NB-IoT uplink subcarrier spacing To set a subcarrier spacing of 3.75 kHz, specify this field as '3.75kHz'. To set a subcarrier spacing of 15 kHz, specify this field as '15kHz'.	char, string

Data Types: struct

chs — Channel transmission configuration

structure

Channel transmission configuration, specified as a structure containing these fields.

Field	Values	Description	Data Types
NPUSCHFormat	'Data', 'Control'	NPUSCH format To indicate that the NPUSCH carries narrowband uplink shared channel (UL-SCH) data, specify this field as 'Data'. To indicate that the NPUSCH carries uplink control information, specify this field as 'Control'.	char, string
NBULSubcarrierSet	Integer in the interval [0, 47], vector of integers in the interval [0, 11]	NB-IoT uplink subcarrier indices, in zero-based form If you specify the NBULSubcarrierSpacing field of the ue input as '3.75kHz', specify this field as an integer in the interval [0, 47]. If you specify the NBULSubcarrierSpacing field of the ue input as '15kHz', specify this field as a vector of integers in the interval [0, 11].	double
NRU	1, 2, 3, 4, 5, 6, 8, 10	Number of RUs	double
NULSlots	2, 4, 8, 16	Number of slots per RU If you specify the NPUSCHFormat field as 'Control', then you must specify this field as 4. If you specify the NPUSCHFormat field as 'Data', then you must specify this field as 16 when you specify the NRUsc field as 1 8 when you specify the NRUsc field as 3 4 when you specify the NRUsc field as 6 2 when you specify the NRUsc field as 12	double
Modulation	'BPSK', 'QPSK', '16QAM'	Modulation type To enable binary phase-shift keying (BPSK), specify this field as 'BPSK'. To enable quadrature phase-shift keying (QPSK), specify this field as 'QPSK'. To enable 16-point quadrature amplitude modulation (16-QAM), specify this field as '16QAM'. If you specify the NPUSCHFormat field as 'Control', then you must specify this field as 'BPSK'.	char, string

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 — NPUSCH RE indices

integer-valued column vector

NPUSCH RE indices, returned as an integer-valued column vector of length N_RE equal to the number of REs.

Data Types: double

info — Information related to NPUSCH RE indices

structure

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

Field	Values	Description	Data Types
G	Nonnegative integer	Number of coded and rate-matched uplink shared channel (UL-SCH) data bits for a codeword	double
Gd	Nonnegative integer	Number of UL-SCH data symbols The function returns this field as the value of chs.NRU x chs.NULSlots x NRE.	double

Data Types: struct

References

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

Version History

Introduced in R2020a

R2023b: 16-QAM

Set the Modulation field of the chs structure to '16QAM' to specify this modulation scheme.