Documentation

# ltePUCCH2Indices

PUCCH format 2 resource element indices

## Description

example

ind = ltePUCCH2Indices(ue,chs) returns a matrix of resource element indices for the Physical Uplink Control Channel (PUCCH) Format 2 transmission given structures containing the UE-specific settings, and the channel transmission configuration.

example

[ind,info] = ltePUCCH2Indices(ue,chs) also returns a PUCCH information structure array info.

example

[___] = ltePUCCH2Indices(ue,chs,opts) formats the returned indices using options specified by opts.

This syntax supports output options from prior syntaxes.

## Examples

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Generate PUCCH format 2 RE indices for a 1.4 MHz bandwidth and PUCCH resource index 0. Use default values for all other parameters.

Initialize UE-specific and channel configuration structures. Generate PUCCH format 2 indices.

ue.NULRB = 6;
ue.CyclicPrefixUL = 'Normal';

chs.ResourceIdx = 0;

ind = ltePUCCH2Indices(ue,chs);
ind(1:4)
ans = 4x1 uint32 column vector

1
2
3
4

Generate the physical uplink control channel (PUCCH) format 2 indices for three transmit antenna paths, and display the information structure output.

Initialize UE-specific and channel configuration structures. Generate PUCCH 2 indices and information outputs.

ue.NULRB = 6;
ue.CyclicPrefixUL = 'Normal';

chs.ResourceIdx = [0 129 2];

[ind,info] = ltePUCCH2Indices(ue,chs);

Because there are three antennas, the indices are output as a three column vector and the info output structure contains three elements. View ind and the size of info to confirm this.

ind(1:5,:)
ans = 5x3 uint32 matrix

1   1069   2017
2   1070   2018
3   1071   2019
4   1072   2020
5   1073   2021

size(info)
ans = 1×2

1     3

View the contents of one of the info structure elements.

info(1)
ans = struct with fields:
PRBSet: [0 5]
RBIdx: 0

Generate the PUCCH format 2 indices for two transmit antenna paths, and output in subscript indexing form.

Initialize UE-specific and channel configuration structures, and the indexing option parameter. Generate PUCCH 2 indices and information outputs.

ue.NULRB = 6;
ue.CyclicPrefixUL = 'Normal';

chs.ResourceIdx = [0 4];

opts = {'sub'};

[ind,info] = ltePUCCH2Indices(ue,chs,opts);

Using 'sub' indexing style, the indices are output in [subcarrier, symbol, antenna] subscript form. View the midpoint of ind and observe the antenna index change.

size(ind)
ans = 1×2

240     3

ind(118:123,:)
ans = 6x3 uint32 matrix

70   14    1
71   14    1
72   14    1
1    1    2
2    1    2
3    1    2

Because there are two antennas, the info output structure contains two elements. View the contents of one of the info structure elements.

size(info)
ans = 1×2

1     2

info(2)
ans = struct with fields:
PRBSet: [0 5]
RBIdx: 0

## Input Arguments

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UE-specific settings, specified as a structure containing these fields.

Number of uplink resource blocks, specified as a integer from 6 to 110.

Data Types: double

Cyclic prefix length for uplink channels, specified as 'Normal' or 'Extended'.

Data Types: char | string

Channel transmission configuration, specified as a structure containing the following fields.

PUCCH resource indices, specified as an integer or a vector of integers. Values range from 0 to 1185. There is one index for each transmission antenna. These indices determine the cyclic shift and orthogonal cover used for transmission. (${n}_{PUCCH}^{\left(2\right)}$)

Data Types: double

Output format options for resource element indices, 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) :

Category Options Description

Indexing style

'ind' (default)

The returned indices are in linear index style.

'sub'

The returned indices are in [subcarrier,symbol,port] subscript row style.

Index base

'1based' (default)

The returned indices are one-based.

'0based'

The returned indices are zero-based.

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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PUCCH format 2 resource element indices, returned as an integer column vector or a three-column integer matrix. By default, the indices are returned in one-based linear indexing form that can directly index elements of a resource matrix. These indices are ordered according to PUCCH format 2 modulation symbol mapping as specified in TS 36.211 [1], Section 5.4. The opts input offers alternative indexing formats. The indices for each antenna are in the columns of ind, with the number of columns determined by the number of PUCCH resource indices specified in chs.ResourceIdx.

Example: [1,2,3,4...]

Data Types: uint32

PUCCH format 2 information, returned as a structure array with elements corresponding to each transmit antenna and containing these fields.

Set of PRB indices, returned as an integer column vector or two-column integer matrix corresponding to the resource allocations.

• When returned as a column vector, the resource allocation is the same in both slots of the subframe.

• When returned as a two-column matrix, the resource allocations can vary for each slot in the subframe.

The PRB indices are zero-based.

Example: [0,5]

Data Types: double

PUCCH logical resource block index, returned as a nonnegative integer. (m)

Data Types: uint32

## 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.