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lteSCIEncode

Syntax

cw = lteSCIEncode(ue,scibits)
cw = lteSCIEncode(ue,scibits,outlen)

Description

example

cw = lteSCIEncode(ue,scibits) returns the codeword resulting from the sidelink control information (SCI) encoding of the input bit vector, scibits, given the field settings in the user equipment structure, ue. As defined in TS 36.212 [1], Section 5.4.3, the encoding process includes 16 bit CRC attachment, tail biting convolutional coding, rate matching and PUSCH interleaving. This processing takes in an SCI message generated with lteSCI. The codeword returned is ready for transmission on the ltePSCCH physical channel.

example

cw = lteSCIEncode(ue,scibits,outlen) rate matches the returned codeword to the output length provided by outlen.

Examples

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Create an SCI format 0 message structure, modify selected information field values, and generate the new SCI message and payload bits. Encode the SCI message payload bits.

Create a UE settings structure and SCI message structure.

ue = struct('NSLRB',50,'CyclicPrefixSL','Normal');
sci0 = lteSCI(ue);

Modify the SCI message structure settings and generate an SCI message bit vector.

sci0.FreqHopping = 1;
sci0.ModCoding = 3;
[sci0,scibits] = lteSCI(ue,sci0);

Generate an encoded SCI message codeword.

cw = lteSCIEncode(ue,scibits);

Create an SCI format 0 message structure, and generate the new SCI message and payload bits. Encode the SCI message payload bits in a codeword of length specified by outlen.

Create a UE settings structure and SCI message structure.

ue = struct('NSLRB',50,'CyclicPrefixSL','Extended');
[sci0,scibits] = lteSCI(ue);

Generate an encoded SCI message codeword of length specified by outlen.

outlen = 144;
cw = lteSCIEncode(ue,scibits,outlen);
size(cw)
ans = 

   144     1

Input Arguments

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User equipment settings, specified as a structure containing this parameter field:

Sidelink mode, specified as 'D2D' or 'V2X'.

Data Types: char

Cyclic prefix length, specified as 'Normal' or 'Extended'.

Data Types: char

Data Types: struct

SCI message bit vector, specified as a column vector. scibits are the SCI processing input bits to be transmitted on a single PSCCH.

Data Types: double | int8

Codeword length, specified as a nonnegative integer. outlen must be a multiple of 2. It should be a multiple of 12 for D2D normal cyclic prefix and a multiple of 10 for extended cyclic prefix and V2X. The output length is meant to match the number of data-carrying SC-FDMA symbols in a PSCCH subframe and align with the dimensions of the PUSCH interleaver stage.

Output Arguments

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Codeword resulting from SCI processing, returned as a column vector of binary values. cw is the result of SCI processing the input vector, scibits. The output codeword matches the normal or extended cyclic prefix bit capacity available in the ltePSCCHIndices output, not accounting for the sidelink SC-FDMA guard symbol. Depending on the function syntax used and input configuration, the length of cw is:

  • 288 bits for nonempty data input and normal cyclic prefix

  • 240 bits for nonempty data input and extended cyclic prefix and for V2X

  • An empty 0-by-1 matrix for an empty data input

  • Rate-matched to outlen

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.

Introduced in R2016b

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