nrLayerMap

Layer mapping of modulated and scrambled codewords

Since R2018b

Syntax

``out = nrLayerMap(in,nLayers)``

Description

example

````out = nrLayerMap(in,nLayers)` performs layer mapping of one or two codewords, specified by `in`, based on the number of transmission layers `nLayers`. The transmission layers in the output are formed by multiplexing the modulation symbols from either one or two codewords. The function implements the transpose of the overall layer mapping specified in TS 38.211 Section 6.3.1.3 and Section 7.3.1.3 [1]. In other words, the symbols in a layer lie in columns rather than rows.```

Examples

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Perform layer mapping of one codeword of length 40, using 4 transmission layers.

```out = nrLayerMap(ones(40,1),4); sizeOut = size(out)```
```sizeOut = 1×2 10 4 ```

Perform layer mapping of two codewords of length 20 and 30 respectively, using 5 transmission layers.

```out = nrLayerMap({ones(20,1),ones(30,1)},5); sizeOut = size(out)```
```sizeOut = 1×2 10 5 ```

Input Arguments

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Modulation symbols in codewords, specified as one of these values:

• Complex column vector — Use this value to specify one codeword.

• Cell array of one or two complex column vectors — Use this value to specify one or two codewords.

Data Types: `double`
Complex Number Support: Yes

Number of transmission layers, specified as an integer from 1 to 8.

Data Types: `double`

Output Arguments

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Layered modulation symbols, returned as a complex matrix of size `M`-by-`nLayers`. `M` is the number of modulation symbols (rows) in a transmission layer (column). The output `out` inherits the data type of the input `in`.

References

[1] 3GPP TS 38.211. “NR; Physical channels and modulation.” 3rd Generation Partnership Project; Technical Specification Group Radio Access Network.

Version History

Introduced in R2018b