# Documentation

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# lteRateMatchTurbo

Turbo rate matching

## Syntax

out = lteRateMatchTurbo(in,outlen,rv)
out = lteRateMatchTurbo(in,outlen,rv,chs)

## Description

example

out = lteRateMatchTurbo(in,outlen,rv) performs rate matching of the input data, in, to create the output vector, out, of length outlen. The input data could be a vector or a cell array. This function includes the stages of subblock interleaving, bit collection and bit selection, and pruning defined for turbo encoded data. For more information, see TS 36.212 [1], Section 5.1.4.1.

The input data can be a single vector or a cell array of vectors assumed to be code blocks. In the cell array case, each vector is rate matched separately and the results are concatenated into the single output vector, out. The length of each nonempty input vector must be an integer multiple of 3. The parameter rv controls the redundancy version of the output. The bit selection stage assumes a QPSK transmission mapped onto a single layer. It also assumes no restriction on the number of soft bits, as in an uplink UL-SCH transport channel.

out = lteRateMatchTurbo(in,outlen,rv,chs) allows additional control of the bit selection stage through selection of parameters for the soft buffer size and physical channel configuration in the chs input structure.

## Examples

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Rate match an input vector of 132 bits to a length of 100 with the RV parameter set to 0.

codedBlklen = 132;
invec = ones(codedBlklen,1);
outlen = 100;
rv = 0;
rmatched = lteRateMatchTurbo(invec,outlen,rv);
size(rmatched)
ans =

100     1

## Input Arguments

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Input data, specified as a single vector or a cell array of vectors, assumed to be code blocks. In the cell array case, each vector is rate matched separately and the results are concatenated into the single output vector, out. The length of each nonempty input vector must be an integer multiple of 3.

Example: ones(132,1)

Data Types: double | cell

Output vector length, specified as a nonnegative integer.

Example: 3

Data Types: double

Redundancy version control, specified as 0, 1, 2, or 3.

Example: 1

Data Types: double

Channel transmission configuration, specified as a structure. It allows additional control of the bit selection stage through parameters for the soft buffer size and physical channel configuration.

For downlink turbo coded transport channels, you can control the soft buffer dimensions by including either NIR or the combined set of NSoftbits, TxScheme, and DuplexMode. If DuplexMode is 'TDD', also specify TDDConfig. If included, NIR, takes precedence for controlling the soft buffer dimensions. When neither of these optional chs fields (NIR or the set including NSoftbits) are present, the function assumes an uplink turbo coded transport channel and places no limit on the number of soft bits.

chs can contain the following fields.

Modulation scheme, specified as 'QPSK', '16QAM', '64QAM', or '256QAM'.

Data Types: char

Number of transmission layers for transport block, specified as 1 (default), 2, 3, or 4. Not necessary if TxScheme is set to 'Port0', 'TxDiversity', or 'Port5'.

Data Types: double

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

Data Types: char

Soft buffer size for entire input transport block, specified as a nonnegative integer.

Data Types: double

Total number of soft channel bits, specified as a nonnegative integer.

Data Types: double

Duplex mode, specified as 'FDD' or 'TDD'.

Data Types: char

Uplink or downlink configuration, specified as a nonnegative scalar integer from 0 through 6. Optional. Only required if DuplexMode is set to 'TDD'.

Data Types: double

Data Types: struct

## Output Arguments

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Turbo rate matched output, returned as a numeric column vector.

Data Types: double | uint8 | uint16 | uint32 | uint64 | int8 | int16 | int32 | int64

## References

[1] 3GPP TS 36.212. “Multiplexing and channel coding.” 3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (E-UTRA). URL: http://www.3gpp.org.

## See Also

#### Introduced in R2013b

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