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# ltePCFICHIndices

PCFICH resource element indices

## Syntax

``ind = ltePCFICHIndices(enb)``
``ind = ltePCFICHIndices(enb,opts)``

## Description

````ind = ltePCFICHIndices(enb)` returns the 16-by-`CellRefP` matrix of subframe resource element (RE) indices for the physical control format indicator channel (PCFICH), given the `enb` input structure. By default, the indices are returned in 1-based linear indexing form that directly indexes elements of a 3-D array representing the subframe resource grid for `CellRefP` antenna ports. Each column of `ind` contains per-antenna indices for 16 resource elements in one of the `CellRefP` array planes. The rows are ordered as the PCFICH modulation symbols should be mapped. The indices can also be returned in a number of alternative indexing formats. The PCFICH is always transmitted on 16 resource elements, or 4 resource element groups (REG), in the first OFDM symbol of a subframe however their locations depend on the `NCellID` and `NDLRB` parameters. ```

example

````ind = ltePCFICHIndices(enb,opts)` formats the returned indices using options specified by `opts`.```

## Examples

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This example generates physical CFI channel (PCFICH) resource element (RE) indices for two different physical layer cell identity values.

To show the effects of the physical layer cell identity, `NCellID` on the indices, first set it to 0. Then, generate and display the PCFICH indices.

```enb.NDLRB = 50; enb.NCellID = 0; enb.CyclicPrefix = 'Normal'; enb.CellRefP = 1; ind = ltePCFICHIndices(enb,{'0based','reg'})```
```ind = 4x1 uint32 column vector 0 150 300 450 ```

`Next, set the physical layer cell identity, |NCellID|, to 1. Regenerate`

`and display the PCFICH indices.`

```enb.NCellID = 1; ind = ltePCFICHIndices(enb,{'0based','reg'})```
```ind = 4x1 uint32 column vector 6 156 306 456 ```

## Input Arguments

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eNodeB cell-wide settings, specified as a structure containing these parameter fields.

Parameter FieldRequired or OptionalValuesDescription
`NDLRB`Required

Scalar integer from 6 to 110

Number of downlink resource blocks. (${N}_{\text{RB}}^{\text{DL}}$)

`NCellID`Required

Integer from 0 to 503

Physical layer cell identity

`CyclicPrefix`Optional

`'Normal'` (default), `'Extended'`

Cyclic prefix length

`CellRefP`Optional

1 (default), 2, 4

Number of cell-specific reference signal (CRS) antenna ports

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):

OptionValuesDescription
Indexing style

`'ind'` (default), `'sub'`

Style for the returned indices, specified as one of the following options.

• `'ind'` — returns the indices in linear index form as a column vector (default)

• `'sub'` — returns the indices in `[subcarrier, symbol, antenna]` subscript row style. The number of rows in the output, `ind`, is the number of resource elements (NRE). Thus, `ind` is an NRE-by-3 matrix.

Index base

`'1based'` (default), `'0based'`

Base value of the returned indices. Specify `'1based'` to generate indices where the first value is 1. Specify `'0based'` to generate indices where the first value is 0.

Indexing unit

`'re'` (default), `'reg'`

Unit of the returned indices. Specify `'re'` to indicate that the returned values correspond to individual resource elements (REs). Specify `'reg'` to indicate that the returned values correspond to resource element groups (REGs).

Example: `'ind 1based'`, `"ind 1based"`, `{'ind','1based'}`, or `["ind","1based"]` specify the same formatting options.

Data Types: `char` | `string` | `cell`

## Output Arguments

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Subframe PCFICH RE indices, returned as a numeric matrix of size 16-by-`CellRefP`. Each column of `ind` contains per-antenna indices for 16 resource elements in one of the `CellRefP` array planes. The rows are ordered as the PCFICH modulation symbols should be mapped.

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