lteNULSCH

Generate NB-IoT UL-SCH codeword

Syntax

cw = lteNULSCH(chs,outLen,trBlkIn)

cw = lteNULSCH(trBlkIn)

Description

cw = lteNULSCH(chs,outLen,trBlkIn) generates cw, an NB-IoT uplink shared channel (UL-SCH) codeword of length outLen, by processing trBlkIn, the input transport block (data) or uplink control information (UCI), for channel transmission configuration settings chs. Use this syntax for NB-IoT UL-SCH data or UCI processing.

NB-IoT UL-SCH data processing comprises type-24A cyclic redundancy check (CRC) attachment, turbo encoding, rate matching to outLen, and interleaving, in accordance with section 6.3.2 of [1].

NB-IoT UL-SCH UCI processing comprises mapping control information bit trBlkIn to a 16-bit codeword cw in accordance with section 6.3.3 of [1].

cw = lteNULSCH(trBlkIn) generates cw by mapping control information bit trBlkIn in accordance with section 6.3.3 of [1]. Use this syntax for NB-IoT UL-SCH UCI processing.

Examples

Generate NB-IoT UL-SCH Data Codeword

Generate a codeword by applying NB-IoT UL-SCH data processing to a transport block.

Configure UE-specific settings.

ue = struct('NBULSubcarrierSpacing','15kHz');

Specify a channel transmission configuration.

chs =  struct('NPUSCHFormat','Data','NULSlots',16,'NBULSubcarrierSet',6, ...
    'Modulation','BPSK','NRU',2,'RV',0);

Specify the codeword length and create a transport block for encoding.

[~,info] = lteNPUSCHIndices(ue,chs);
outLen = info.G;
trBlkIn = randi([0,1],144,1);

Generate the UL-SCH codeword.

cw = lteNULSCH(chs,outLen,trBlkIn);

Generate NB-IoT UL-SCH UCI Codeword

Generate a codeword by applying UCI processing to a control information bit.

Create a control information bit for encoding.

trBlkIn = 1;

Generate and display the NB-IoT UL-SCH codeword.

cw = lteNULSCH(trBlkIn);
disp(cw')

   1   1   1   1   1   1   1   1   1   1   1   1   1   1   1   1

Input Arguments

chs — Channel transmission configuration

structure

Channel transmission configuration, specified as a structure containing these fields.

Field	Values	Description	Data Types
NPUSCHFormat	'Data' (default), 'Control'	Narrowband physical uplink shared channel (NPUSCH) format To indicate that the NPUSCH carries narrowband uplink shared channel (UL-SCH) data, specify this field as 'Data'. To indicate that the NPUSCH carries uplink control information, specify this field as 'Control'.	char, string
NRU	1, 2, 3, 4, 5, 6, 8, 10	Number of resource units (RUs)	double
NULSlots	2, 4, 8, 16	Number of slots per RU	double
Modulation	'BPSK', 'QPSK', '16QAM'	Modulation type, specified as one of these values: To enable binary phase-shift keying (BPSK), specify this field as 'BPSK'. To enable quadrature phase-shift keying (QPSK), specify this field as 'QPSK'. To enable 16-point quadrature amplitude modulation (16-QAM), specify this field as '16QAM'.	char, string
RV	0, 2	Redundancy version indicator	double

Data Types: struct

outLen — Codeword length

positive integer

Codeword length, specified as a positive integer.

When you specify the NPUSCHFormat field of the chs input as 'Data', specify this input as the NPUSCH capacity for the associated codeword. The lteNULSCH function generates the cw output as a vector of this length by rate matching the encoded transport block to the specified value.

When you specify the NPUSCHFormat field of the chs input as 'Control', the lteNULSCH function sets this input to 16.

Data Types: double

trBlkIn — Transport block (data) or UCI

0 | 1 | binary-valued column vector

Transport block (data) or UCI, specified as one of these values.

NPUSCH Format	trBlkIn	Value
Data	Transport block	Binary-valued column vector
Control	UCI	0, 1

Data Types: double

Output Arguments

cw — NB-IoT UL-SCH codeword

binary-valued column vector

NB-IoT UL-SCH codeword, returned as a binary-valued column vector of length outLen.

Data Types: int8

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). https://www.3gpp.org.

Version History

Introduced in R2020a

R2023b: 16-QAM

Set the Modulation field of the chs structure to '16QAM' to specify this modulation scheme.