ltePUCCH3Decode

Physical uplink control channel format 3 decoding

Description

example

out = ltePUCCH3Decode(ue,chs,sym) decodes the PUCCH format 3 given UE-specific settings, ue, and channel transmission configuration, chs. out is a soft bit vector of coded UCI consisting of 48 bits, formed by decoding the complex symbol matrix, sym. The symbol decoding steps are SC-FDMA deprecoding, demodulation with the PUCCH Format 3 reference sequence, QPSK demodulation, and descrambling. The symbols for each antenna are in the columns of sym, and the number of columns should match the number of PUCCH Resource Indices specified in the structure chs.

Examples

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Decode a PUCCH format 3 signal contained in an equalized resource array for the specified UE and PUCCH configuration structures.

ue.NULRB = 6;
ue.NCellID = 0;
ue.RNTI = 1;
ue.CyclicPrefixUL = 'Normal';
ue.NTxAnts = 1;
ue.Shortened = 0;
ue.NSubframe = 0;

pucch3.ResourceIdx = 0;

To model the transmitter, create an uplink resource grid and populate it with PUCCH format 3 symbols.

reGrid = lteULResourceGrid(ue);
pucch3Indices = ltePUCCH3Indices(ue,pucch3);
tx = [1; 0; 0; 1; 1; 1];
encoded = lteUCI3Encode(tx);
reGrid(pucch3Indices) = ltePUCCH3(ue,pucch3,encoded);

To model the receiver, decode the PUCCH format 3 symbols contained in an equalized resource array. Decode and display the UCI. Verify received decoded bits match tx bits.

eqGrid = reGrid;
rx = ltePUCCH3Decode(ue,pucch3,eqGrid(pucch3Indices));
decoded = lteUCI3Decode(rx,length(tx))
decoded = 6x1 logical array

1
0
0
1
1
1

Input Arguments

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UE-specific configuration settings, specified as a structure that can contain the following fields.

Parameter FieldRequired or OptionalValuesDescription
NCellIDRequired

Integer from 0 to 503

Physical layer cell identity

RNTIRequired

0 (default), scalar integer

Radio network temporary identifier (RNTI) value (16 bits)

NSubframeRequired

0 (default), nonnegative scalar integer

Subframe number

CyclicPrefixULOptional

'Normal' (default), 'Extended'

Cyclic prefix length

ShortenedOptional

0 (default), 1

Option to shorten the subframe by omitting the last symbol, specified as 0 or 1. If 1, the last symbol of the subframe is not used. For subframes with possible SRS transmission, set Shortened to 1 to maintain a standard compliant configuration.

Data Types: struct

PUCCH channel settings, specified as a structure that can contain the following fields.

Parameter FieldRequired or OptionalValuesDescription
ResourceIdxOptional

0 (default), integer from 0 to 549, or vector of integers.

PUCCH resource indices which determine the physical resource blocks, cyclic shift, and orthogonal cover used for transmission (${n}_{PUCCH}^{\left(3\right)}$). Define one index for each transmission antenna.

Data Types: struct

PUCCH format 3 symbols, specified as a complex-valued matrix. The symbols for each antenna are in the columns of sym, and the number of columns should match the number of PUCCH resource indices specified in the structure chs.

Data Types: double
Complex Number Support: Yes

Output Arguments

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Soft bit vector consisting of 48 bits, returned as a 48-by-1 real-valued column vector. The number of PUCCH Resource Indices specified in the structure chs determines the number of columns in out.

Data Types: double

Version History

Introduced in R2014a