lteCSIRSIndices
CSI-RS resource element indices
Description
Examples
Generate Column Vector of CSI-RS RE Indices
Generate a column vector of CSI-RS resource element linear indices for ports 15 to 22 of a 10 MHz downlink subframe 0 resource grid.
Create a 10 MHz, downlink, subframe 0 configuration parameter structure. Set the number of antenna ports to 8, the CSI-RS configuration to 0, and Icsi-rs
to 5.
rmc = lteRMCDL('R.2');
rmc.CSIRefP = 8;
rmc.CSIRSConfig = 0;
rmc.CSIRSPeriod = 5;
The 8 antenna ports are ports 15 to 22. The variable Icsi-rs
= 5 is equivalent to a [Tcsi-rs Dcsi-rs]
setting of [10 0]
.
csirs1 = lteCSIRSIndices(rmc); csirs1(1:5)
ans = 5x1 uint32 column vector
3010
3022
3034
3046
3058
Generate Matrix of CSI-RS RE Indices
This example shows how to generate a matrix of CSI-RS RE linear indices for ports 15 to 22 of a 10 MHz downlink subframe 0 resource grid.
Create a 10 MHz, downlink, subframe 0 configuration parameter structure. Set the number of antenna ports to 8, the CSI-RS configuration to 0, and Icsi-rs
to 5.
rmc = lteRMCDL('R.2');
rmc.CSIRefP = 8;
rmc.CSIRSConfig = 0;
rmc.CSIRSPeriod = 5;
Generate a matrix of linear indices with eight columns.
csirs2 = lteCSIRSIndices(rmc,'mat');
size(csirs2)
ans = 1×2
88 8
Generate Used and Unused CSI-RS RE Indices
This example shows how to generate both used and unused CSI-RS RE linear indices for ports 15 to 22 of a 10 MHz downlink subframe 0 resource grid.
Create a 10 MHz, downlink, subframe 0 configuration parameter structure. Set the number of antenna ports to 8, the CSI-RS configuration to 0, and Icsi-rs
to 5.
rmc = lteRMCDL('R.2');
rmc.CSIRefP = 8;
rmc.CSIRSConfig = 0;
rmc.CSIRSPeriod = 5;
The 8 antenna ports are ports 15 to 22. The variable Icsi-rs
= 5 is equivalent to a [Tcsi-rs Dcsi-rs]
setting of [10 0]
.
Generate both used and unused CSI-RS RE in all ports.
csirs3 = lteCSIRSIndices(rmc,'rs+unused');
csirs3(1:5)
ans = 5x1 uint32 column vector
3010
3022
3034
3046
3058
Input Arguments
enb
— eNodeB cell-wide settings
structure
eNodeB cell-wide settings, specified as a structure containing these parameter fields:
Parameter Field | Required or Optional | Values | Description |
---|---|---|---|
NDLRB | Required | Scalar integer from 6 to 110 | Number of downlink resource blocks () |
NSubframe | Required | 0 (default), nonnegative scalar integer | Subframe number |
NFrame | Optional | 0 (default), nonnegative scalar integer | Frame number |
CellRefP is
only used when the Indexing format option
for indexing generation is'rs+unused' | |||
CellRefP | Optional | 1 (default), 2, 4 | Number of cell-specific reference signal (CRS) antenna ports |
CyclicPrefix | Optional |
| Cyclic prefix length |
DuplexMode | Optional |
| Duplexing mode, specified as either:
|
The following apply when | |||
TDDConfig | Optional | 0, 1 (default), 2, 3, 4, 5, 6 | Uplink–downlink configuration |
SSC | Optional | 0 (default), 1, 2, 3, 4, 5, 6, 7, 8, 9 | Special subframe configuration (SSC) |
CSIRSPeriod | Optional |
See note. | CSI-RS subframe configurations for one or more CSI-RS resources. Multiple CSI-RS resources can be configured from a single common subframe configuration or from a cell array of configurations for each resource. |
The following CSI-RS resource
parameters apply only when | |||
CSIRSConfig | Required | Nonnegative scalar integer | Array CSI-RS configuration indices. See TS 36.211, Table 6.10.5.2-1. |
CSIRefP | Required | 1 (default), 2, 4, 8 | Array of number of CSI-RS antenna ports |
ZeroPowerCSIRSPeriod | Optional |
See note. | Zero power CSI-RS subframe configurations for one or more zero power CSI-RS resource configuration index lists. Multiple zero power CSI-RS resource lists can be configured from a single common subframe configuration or from a cell array of configurations for each resource list. |
The following zero power
CSI-RS resource parameter is required only if one, or more of the
other zero power subframe configurations are set to any value other
than | |||
ZeroPowerCSIRSConfig | Required | 16-bit bitmap character vector or string scalar (truncated if
not 16 bits or | Zero power CSI-RS resource configuration index lists (TS 36.211
Section 6.10.5.2). Specify each list as a 16-bit bitmap character vector or string scalar (if
less than 16 bits, then |
Note:
|
opts
— Index generation options
character vector | cell array of character vectors | string array
Index generation options, specified as a character vector, cell
array of character vectors, or string array. For convenience, you can specify several options as
a single character vector or string scalar by a space-separated list of values placed inside the
quotes. Values for opts
when specified as a character vector include (use
double quotes for string):
Option | Values | Description |
---|---|---|
Indexing style |
| Style for the returned indices, specified as one of the following options.
NRE is the number of resource elements. |
Index base |
| Base value of the returned indices. Specify
|
Indexing format |
| Format for the returned locations, specified as one of the following options.
|
Note Returned indices specify the CSI-RS resource values within an
N-by-M-by-antennas array. Where the number of antennas is |
Example: 'ind rsonly'
, "ind rsonly"
,
{'ind','rsonly'}
, or
["ind","rsonly"]
specify the same formatting
options.
Data Types: char
| string
| cell
Output Arguments
ind
— Channel state information reference signal (CSI-RS) indices
column vector (default) | matrix
Channel state information reference signal (CSI-RS) indices, returned as a vector or matrix. See lteCSIRSIndices Processing.
Data Types: uint32
More About
lteCSIRSIndices Processing
The lteCSIRSInidices
function
supports the creation of multiple non-zero power resources and zero
power CSI-RS.
By default the output indices as re returned as a column vector in one-based linear indexing form, that can directly index elements in an N-by-M-by-max(CSIRefP) array. These indices represent the subframe grid across max(CSIRefP) antenna ports (p = 15,...,22). Other index representations can also be created as well as whether the output includes the RE that should be empty in a specific port because of CSI-RS transmissions in another port. These indices are ordered as the complex CSI-RS symbols should be mapped and do not include any elements allocated to PBCH, PSS, and SSS. You can define the CSI-RS subframe configuration schedule as required for the CSI-RS resources. If the subframe contains no CSI-RS, then an empty vector is returned. When multiple non-zero power and zero power CSI-RS are returned, the indices for the zero power CSI-RS appear first in the concatenated output, followed by the indices for the ordered set of CSI-RS resources.
References
[1] 3GPP TS 36.211. “Evolved Universal Terrestrial Radio Access (E-UTRA); Physical Channels and Modulation.” 3rd Generation Partnership Project; Technical Specification Group Radio Access Network. URL: https://www.3gpp.org.
Version History
Introduced in R2014a
See Also
lteCSIRS
| lteCellRSIndices
| lteDMRSIndices
| ltePRSIndices
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