ltePUCCH3PRBS

PUCCH format 3 pseudorandom scrambling sequence

Syntax

[seq,cinit] = ltePUCCH3PRBS(ue,n)

[seq,cinit] = ltePUCCH3PRBS(ue,n,mapping)

[subseq,cinit] = ltePUCCH3PRBS(ue,pn)

[subseq,cinit] = ltePUCCH3PRBS(ue,pn,mapping)

Description

[seq,cinit] = ltePUCCH3PRBS(ue,n) returns a column vector containing the first n outputs of the Physical Uplink Control Channel (PUCCH) format 3 scrambling sequence when initialized according to UE-specific settings, ue, which must be a structure. It also returns an initialization value cinit for the pseudorandom binary sequence (PRBS) generator.

[seq,cinit] = ltePUCCH3PRBS(ue,n,mapping) allows control over the format of the returned sequence, seq, with the input mapping.

[subseq,cinit] = ltePUCCH3PRBS(ue,pn) returns a subsequence of a full PRBS sequence, specified by pn.

[subseq,cinit] = ltePUCCH3PRBS(ue,pn,mapping) allows additional control over the format of the returned subsequence, subseq, with the input mapping.

Examples

Scramble Random PUCCH3 Codeword

Scramble a random PUCCH3 codeword.

Create a ue-specific configuration structure. Generate a codeword. Generate a PUCCH3 pseudorandom scrambling sequence the same length as the codeword.

ue.NCellID = 1;
ue.NSubframe = 0;
ue.RNTI = 1;
cw = randi([0 1],48,1);
seq = ltePUCCH3PRBS(ue,length(cw));

Scramble codeword with PDCCH PRBS.

scrambled = xor(seq,cw);

Scramble UCI3 Codeword

Scramble a UCI3 codeword with a PUCCH3 pseudorandom scrambling sequence.

Create a ue-specific configuration structure. Generate a UCI3 codeword. The UCI3 codeword is 48 bits long.

ue.NCellID = 1;
ue.NSubframe = 0;
ue.RNTI = 1;

txAck = [1;0;0;1];
cw = lteUCI3Encode(txAck);
cwLength = length(cw)

cwLength = 
48

Generate a PUCCH3 pseudorandom scrambling sequence the same length as the codeword. Scramble codeword with PDCCH PRBS.

seq = ltePUCCH3PRBS(ue,length(cw));
scrambled = xor(seq,cw);

Generate PUCCH Format 3 Pseudorandom Scrambling Sequence

This example shows the generation of unsigned and signed PUCCH format 3 pseudorandom scrambling sequences.

Initialize ue specific parameters.

ue = struct('NCellID',1,'NSubframe',0,'RNTI',1);

Generate a PUCCH format 3 pseudorandom scrambling sequence.

pucch3Seq = ltePUCCH3PRBS(ue,5)

pucch3Seq = 5×1 logical array

   1
   1
   0
   0
   1

Generate a signed PUCCH format 3 pseudorandom scrambling sequence.

pucch3Seq = ltePUCCH3PRBS(ue,5,'signed')

pucch3Seq = 5×1

    -1
    -1
     1
     1
    -1

Input Arguments

ue — UE-specific settings

structure

UE-specific settings, specified as a structure having the following fields.

NCellID — Physical layer cell identity

integer (0...503)

Physical layer cell identity, specified as an integer between 0 and 503.

Data Types: double

NSubframe — Subframe number

integer

Subframe number, specified as an integer.

Data Types: double

RNTI — Radio Network Temporary Identifier

integer

Radio Network Temporary Identifier (16-bit), specified as an integer.

Data Types: double

Data Types: struct

n — Number of elements in returned sequence

numeric scalar

Number of elements in returned sequence, seq, specified as a numeric scalar.

Data Types: double

pn — Range of elements in returned subsequence

row vector

Range of elements in returned subsequence, subseq, specified as a row vector of [p n]. The subsequence returns n values of the PRBS generator, starting at position p (0-based).

Data Types: double

mapping — Output sequence formatting

'binary' (default) | 'signed'

Output sequence formatting, specified as 'binary' or 'signed'. mapping controls the format of the returned sequence.

• 'binary' maps true to 1 and false to 0.

• 'signed' maps true to –1 and false to 1.

Data Types: char | string

Output Arguments

seq — PUCCH format 3 scrambling sequence

logical column vector | numeric column vector

PUCCH format 3 scrambling sequence, returned as a logical column vector or a numeric column vector. seq contains the first n outputs of the scrambling sequence. If you set mapping to 'signed', the output data type is double. Otherwise, the output data type is logical.

Data Types: logical | double

subseq — PUCCH format 3 scrambling subsequence

logical column vector | numeric column vector

PUCCH format 3 scrambling subsequence, returned as a logical column vector or a numeric column vector. subseq contains the values of the PRBS generator specified by pn. If you set mapping to 'signed', the output data type is double. Otherwise, the output data type is logical.

Data Types: logical | double

cinit — Initialization value for PRBS generator

numeric scalar

Initialization value for PRBS generator, returned as a numeric scalar.

Data Types: uint32

Version History

Introduced in R2014a