lteNPDSCHIndices
Generate NPDSCH RE indices
Description
[
returns
ind
,info
]
= lteNPDSCHIndices(enb
,chs
)ind
, an array containing narrowband physical downlink
shared channel (NPDSCH) 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 10.2.3.4 of
[1]. Initialize this
function with cell-wide settings enb
and channel transmission
configuration chs
.
Examples
Generate NPDSCH RE Indices and Info Structure
Generate the NPDSCH 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;
enb.OperationMode = 'Inband-SamePCI';
Create the channel transmission configuration. Specify the number of subframes (NSF). The NSF field is required for returning information related to the NPDSCH indices.
chs.NPDSCHDataType = 'BCCHNotSIB1NB';
chs.NSF = 2;
Generate the NPDSCH RE indices column vector. Display the first seven indices.
[ind,info] = lteNPDSCHIndices(enb,chs); ind(1:7)
ans = 7×1
37
38
39
40
41
42
43
Display the fields contained in the info
structure.
info.G
ans = 472
info.Gd
ans = 236
Generate NPDSCH RE Indices
Generate the NPDSCH RE 0-based indices mapping in linear index form for two antennas.
Create the eNodeB structure cell-wide settings for two antennas.
enb.NNCellID = 10;
enb.NBRefP = 2;
enb.OperationMode = 'Standalone';
Create the channel transmission configuration.
chs.NPDSCHDataType = 'SIB1NB';
Generate the 0-based NPDSCH RE indices in linear index form. The indices matrix has two columns, one for each antenna ports. Display the first seven indices.
ind = lteNPDSCHIndices(enb,chs,{'0based','ind'}); ind(1:7,:)
ans = 7×2
0 168
1 169
2 170
3 171
4 172
5 173
6 174
Input Arguments
enb
— Cell-wide settings
structure
Cell-wide settings, specified as a structure containing these fields:
Name | Required or Optional | Values | Description | Dependencies | Data Types |
---|---|---|---|---|---|
NNCellID | Required | Nonnegative integer | Narrowband physical layer cell identity (PCI) | — | double |
NBRefP | Required | 1 , 2 | Number of narrowband reference signal (NRS) antenna ports | — | double |
OperationMode | Optional | 'Standalone' (default),
'Inband-SamePCI' ,
'Inband-DifferentPCI' ,
'Guardband' | NB-IoT operation mode, specified as one of these values:
| — | char ,
string |
CellRefP | Optional | 1 , 2 ,
4 | Number of cell-specific reference signal (CRS)
antenna ports. The value of this field must be either
the value to which you set the
NBRefP field (default) or
4 . | This field applies only when you specify the
OperationMode field as
'Inband-SamePCI' or
'Inband-DifferentPCI' . When you
specify the OperationMode field as
'Inband-SamePCI' , the
lteNPDSCHIndices function sets this
field to the value of the NBRefP
field. | double |
ControlRegionSize | See Dependencies column | 3 (default), scalar in the
interval [0, 13] | LTE control region size. This field sets the starting OFDM symbol index (zero-based) in a subframe. |
| double |
Data Types: struct
chs
— Channel transmission configuration
structure
Channel transmission configuration, specified as a structure containing these fields:
Name | Required or Optional | Values | Description | Dependencies | Data Types |
---|---|---|---|---|---|
NPDSCHDataType | Optional | 'NotBCCH' ,
'SIB1NB' ,
'BCCHNotSIB1NB' | Type of data carried by the NPDSCH, specified as one of these values:
| — | char ,
string |
NSF | See Dependencies column | Nonnegative integer | Number of subframes to which a codeword is mapped, not including repetitions |
| double |
Modulation | Optional | 'QPSK' (default),
'16QAM' | Modulation type | — | 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
To return the indices
as an NRE-by-3 matrix,
where NRE is the
number of REs, specify this option as |
base | '1based' (default),
'0based' | Index base To generate indices whose first
value is |
Example: 'ind 0based'
, "ind 0based"
,
{'ind','0based'}
, and
["ind","0based"]
specify the same output
options.
Data Types: char
| string
| cell
Output Arguments
ind
— NPDSCH RE indices
real-valued matrix
NPDSCH RE indices, returned as an
NRE-by-P
real-valued matrix, where NRE is
the number of resource elements and P is the number of
resource array planes. Each column of ind
contains the
per-antenna indices for the NRE
resource elements in each of the P resource array
planes.
Data Types: double
info
— Information related to NPDSCH indices
structure
Information related to NPDSCH indices, returned as a structure containing these fields:
Name | Values | Description | Data Types |
---|---|---|---|
G | scalar | Number of coded and rate-matched downlink shared channel (DL-SCH) data bits for a codeword | double |
Gd | integer | Number of DL-SCH data symbols per layer. The
lteNPDSCHIndices function returns
Gd as the value of the
NSF field of the
chs input multiplied by the
number of rows in the ind
output. | 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). URL: https://www.3gpp.org.
Version History
Introduced in R2018aR2023b: Different modulation types
You can specify the Modulation
field of the structure chs
as
'QPSK'
or '16QAM'
. Do this to choose a
modulation type.
See Also
lteNPDSCH
| lteNPDSCH
| lteNPDSCHDecode
| lteNRSIndices
| ltePDSCHIndices
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