PDCCH resource element indices
ind = ltePDCCHIndices(
CellRefP matrix of
one-based linear indexing RE indices given the structure
It returns the subframe resource element (RE) indices for the physical
downlink control channels (PDCCH).
NRE indices returned cover all PDCCH
resources in the control region not already assigned to PCFICH or
are ordered as the complete block of padded, interleaved, and shifted
PDCCH modulation symbols that ready to be mapped, as described in
TS 36.211 , Section 6.8.5.
a matrix of indices, where the vector
ind = ltePDCCHIndices(
defines resources not to be assigned to PDCCH. The
contain valid resource element group (REG) indices but can be either
zero-based or one-based throughout, and indices which do not fall
within the control region are ignored.
Retrieve PDCCH resource element (RE) indices.
Create an RMC R.0 configuration structure and find its PDCCH RE indices. Display the size of the indices.
enb = lteRMCDL('R.0'); ind = ltePDCCHIndices(enb); size(ind)
ans = 1×2 452 1
Explicitly exclude resources when retrieving PDCCH indices.
Create a cell-wide configuration structure initialized for RMC R.0. Generate RE indices for the PDCCH providing an empty matrix for the argument
exreg so that no resources are excluded.
enb = lteRMCDL('R.0'); ind = ltePDCCHIndices(enb,,'re'); numPDCCHwithNoExclusion = size(ind)
numPDCCHwithNoExclusion = 1×2 480 1
All RE indices are returned in the required mapping order.
Explicitly exclude the PCFICH and PHICH indices.
enb = lteRMCDL('R.0'); exreg = [ltePCFICHIndices(enb,'reg'); ltePHICHIndices(enb,'reg')]; ind = ltePDCCHIndices(enb,exreg,'re'); numPDCCHwithExclusion = size(ind)
numPDCCHwithExclusion = 1×2 452 1
This call returns the same result as the default syntax call,
enb— Cell-wide settings
enb is a structure having the following
|Parameter Field||Required or Optional||Values||Description|
Integer within the range (6,...,110)
Number of downlink resource blocks. ()
Integer from 0 to 503
Physical layer cell identity
Cyclic prefix length
1, 2, 4
Number of cell-specific reference signal (CRS) antenna ports
1, 2, or 3
Control format indicator value
HICH group multiplier
Duplexing mode, specified as:
|The following field is
required when |
0, 1 (default), 2, 3, 4, 5, 6
Integer greater than 0
exreg— Resources excluded from PDCCH
Resources excluded from PDCCH, specified as a vector. This vector
explicitly defines those resources not to be assigned to PDCCH.
exreg must contain valid resource element group
(REG) indices but can be either zero-based or one-based throughout. Indices
which do not fall within the control region are ignored.
ind— PDCCH RE indices
PDCCH RE indices, returned as an
matrix by default. The matrix contains one-based linear indexing RE
indices. Each column of
ind identifies the same
NRE subframe resource elements but with
indices offset to select them in a different antenna “page”
of the 3-D resource array.
The default matrix of indices in a one-based linear indexing
style which can directly index elements of an M-by-N-by-
where M is the number of symbols, and N is
the number of subcarriers representing the subframe grid across
 3GPP TS 36.211. “Physical Channels and Modulation.” 3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (E-UTRA). URL: https://www.3gpp.org.