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ltePMIInfo

Precoder matrix indication reporting information

Syntax

• ``info = ltePMIInfo(enb,chs)``
example

Description

example

````info = ltePMIInfo(enb,chs)` returns a precoder matrix indication (PMI) reporting information structure, given structures containing cell-wide settings, and the channel transmission configuration settings. For more information, see TS 35.213 [1].```

Examples

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Get the PMI reporting information for RMC R.13.

```enb = lteRMCDL('R.13'); pmiInfo = ltePMIInfo(enb, enb.PDSCH) ```
```pmiInfo = struct with fields: k: 50 NSubbands: 1 MaxPMI: 15 CodebookSubsetSize: 16 ```

Input Arguments

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Cell-wide settings, specified as a scalar structure. The structure contains the following fields:

Parameter FieldRequired or OptionalValuesDescription
`NDLRB`Required

Scalar integer from 6 to 110

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

`CellRefP`Optional

1 (default), 2, 4

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

The following parameter applies when `chs`.`TxScheme` is set to `Port7–14`.

`CSIRefP`Optional

1 (default), 2, 4, 8

Array of number of CSI-RS antenna ports

Data Types: `struct`

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

Parameter FieldRequired or OptionalValuesDescription
`PMIMode`Optional

`'Wideband'` (default), `'Subband'`

PMI reporting mode. `PMIMode`=`'Wideband'` corresponds to PUSCH reporting Mode 1-2 or PUCCH reporting Mode 1-1 (PUCCH Report Type 2) and `PMIMode`=`'Subband'` corresponds to PUSCH reporting Mode 3-1.

`NLayers`Optional

Integer from 1 to 8

Default number of layers is 1.

Number of transmission layers.

`TxScheme`Optional

`'Port0'`, `'TxDiversity'`, `'CDD'`, `'SpatialMux'`, `'MultiUser'`, `'Port5'`, `'Port7-8'`, `'Port8'`, `'Port7-14'`.

PDSCH transmission scheme, specified as one of the following options.

Transmission schemeDescription
`'Port0'`Single antenna port, port 0
`'TxDiversity'`Transmit diversity
`'CDD'`Large delay cyclic delay diversity scheme
`'SpatialMux'`Closed loop spatial multiplexing
`'MultiUser'`Multi-user MIMO
`'Port5'`Single-antenna port, port 5
`'Port7-8'`Single-antenna port, port 7, when `NLayers` = 1. Dual layer transmission, ports 7 and 8, when `NLayers` = 2.
`'Port8'`Single-antenna port, port 8
`'Port7-14'`Up to eight layer transmission, ports 7–14

The following parameter applies when `'Port7–14'` transmission scheme with `CSIRefP` equal to 4, or for `'Port7-8'` or `'Port8'` transmission scheme with `CellRefP` equal to 4.

`AltCodebook4Tx `Optional

`'Off'` (default), `'On'`

If set to `'On'`, enables the alternative codebook for CSI reporting with four antennas defined in TS 36.213, Tables 7.2.4-0A to 7.2.4-0D. The default is `'Off'`. (alternativeCodebookEnabledFor4TX-r12)

Data Types: `struct`

Output Arguments

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Information related to PMI reporting, returned as a structure containing these fields:

Parameter FieldDescriptionValues
`k`

Subband size, in resource blocks (equal to `NRB` for wideband PMI reporting or transmission schemes without PMI reporting).

numeric scalar
`NSubbands`

Number of subbands for PMI reporting (equal to 1 for wideband PMI reporting) or transmission schemes without PMI reporting.

numeric scalar
`MaxPMI`

Maximum permitted PMI value for the given configuration. Valid PMI values range from 0 to `MaxPMI`. For CSI reporting, when `CSIRefP = 8`, or for CSI reporting with the alternative codebook for four antennas,`MaxPMI` is a 2–element vector, indicating the maximum permissible values of i1 and i2, the first and second codebook indices. For transmission schemes without PMI reporting, ```MaxPMI = 0```.

nonnegative numeric scalar
`CodeBookSubsetSize`

Size of the codebook subset restriction bitmap. For transmission schemes without PMI reporting, `CodebookSubsetSize=0`.

scalar

`info``.``NSubbands` can be used to determine the correct size of the vector `PMISet` required for closed-loop spatial multiplexing operation; `PMISet` should be a column vector with `info``.``NSubbands` rows. For CSI reporting with `CSIRefP = 8`, or for CSI reporting with the alternative codebook for four antennas, `info``.``NSubbands` indicates the number of second codebook indices, i2, in the report. The first codebook index, i1, is always chosen in a wideband fashion, and is therefore a scalar. The PMI reporting mode is set with `chs``.``PMIMode`.

References

[1] 3GPP TS 36.213. "Physical layer procedures." 3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (E-UTRA). URL: http://www.3gpp.org.