# lteExtractResources

Extract resource elements

## Syntax

## Description

`[`

extracts resource elements `re`

,`reind`

] = lteExtractResources(`ind`

,`grid`

)`re`

their indices
`reind`

from resource array `grid`

using
resource elements indices `ind`

. You can extract resource
elements from a resource grid with different dimensionality than the resource grid
addressed by the indices. The indices specified and returned are in 1–based linear
indexing form. Other indexing options are available. The resource extraction process
is further explained in Algorithms.

In LTE Toolbox™, indices are generated for mapping
sequences of physical channel and signal symbols to a resource grid.
These indices are generated using channel-or signal-specific functions
and address resource elements in an array sized, *M*-by-*N*-by-*P*. *M* is
the number of subcarriers, *N* is the number of OFDM
or SC-FDMA symbols and *P* is the number of planes.
The diagram highlights the resource elements of a resource grid addressed
by indices, `ind`

. The indices are in a 1–based
linear indexing form. *P = 2* is the number of antenna
ports.

Typically the resource array extracts resource elements from one of the following:

A 3-D received grid, sized

*M*-by-*N*-by-*NRxAnts*.*NRxAnts*is the number of receive antennas. This grid is created after OFDM or SC-FDMA demodulation.A 4-D channel estimation grid, sized

*M*-by-*N*-by-*NRxAnts*-by-*P*. This grid is created by channel estimation functions (refer Channel Estimation).

You can describe the size of the 3- D received grid as a 4-D grid that has a trailing singleton dimension.

## Examples

## Input Arguments

## Output Arguments

## Algorithms

## Version History

**Introduced in R2014b**

## See Also

`ltePUSCHDecode`

| `ltePUSCHIndices`

| `ltePDCCHDecode`

| `ltePDCCHIndices`

| `ltePBCHDecode`

| `ltePBCHIndices`

| `ltePDSCHDecode`

| `ltePDSCHIndices`

| `ltePDCCHDecode`

| `ltePDCCHIndices`

| `ltePCFICHDecode`

| `ltePCFICHIndices`

| `ltePHICHDecode`

| `ltePHICHIndices`

| `lteCellRSIndices`

| `lteSCFDMADemodulate`

| `lteOFDMDemodulate`

| `lteDLChannelEstimate`

| `lteULChannelEstimate`

| `ltePUCCH1Decode`

| `ltePUCCH1Indices`

| `lteULChannelEstimatePUCCH1`

| `ltePUCCH2Decode`

| `ltePUCCH2Indices`

| `lteULChannelEstimatePUCCH2`

| `ltePUCCH3Decode`

| `ltePUCCH3Indices`

| `lteULChannelEstimatePUCCH3`

| `lteDLResourceGrid`

| `lteULResourceGrid`