ltePUCCH3Decode

Physical uplink control channel format 3 decoding

Syntax

out = ltePUCCH3Decode(ue,chs,sym)

Description

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

Decode PUCCH Format 3 Signal

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 = 6×1 logical array

   1
   0
   0
   1
   1
   1

Input Arguments

ue — UE-specific settings

structure

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

Parameter Field	Required or Optional	Values	Description
NCellID	Required	Integer from 0 to 503	Physical layer cell identity
RNTI	Required	0 (default), scalar integer	Radio network temporary identifier (RNTI) value (16 bits)
NSubframe	Required	0 (default), nonnegative scalar integer	Subframe number
CyclicPrefixUL	Optional	'Normal' (default), 'Extended'	Cyclic prefix length
Shortened	Optional	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

chs — Channel transmission configuration

structure

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

Parameter Field	Required or Optional	Values	Description
ResourceIdx	Optional	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 ($$n_{PUCCH}^{(3)}$$). Define one index for each transmission antenna.

Data Types: struct

sym — PUCCH format 3 symbols

complex-valued matrix

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

out — Soft bit vector

48-by-1 real-valued column vector

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