ltePSSS
Primary sidelink synchronization signal
Syntax
Description
returns
a 124-by-1 complex column vector containing the primary sidelink synchronization
signal (PSSS) values for user equipment settings in the s
= ltePSSS(ue
)ue
structure.
For more information, see Primary Sidelink Synchronization Signal.
Examples
Generate PSSS
Generate PSSS values for in-coverage and out-of-coverage identities.
psss_net = ltePSSS(struct('NSLID',0)); psss_oon = ltePSSS(struct('NSLID',168));
Plot the returned synchronization signal for the in-coverage identities (blue, +) and the out-of-coverage identities (red, o).
scatPlot = scatterplot(psss_net,1,0,'b+'); grid hold on scatterplot(psss_oon,1,0,'ro',scatPlot)
Input Arguments
ue
— User equipment settings
structure
UE-specific settings, specified as a structure containing this parameter field:
NSLID
— Physical layer sidelink synchronization identity
integer from 0 to 335
Physical layer sidelink synchronization identity, specified as an integer from 0 to 335. ()
For more information, see Primary Sidelink Synchronization Signal.
Example: 6
Data Types: double
Output Arguments
s
— PSSS values
complex-valued numeric column vector
PSSS values, returned as a 124-by-1 complex-valued numeric column
vector. These values are created for the user equipment settings in
the ue
structure. For more information, see Primary Sidelink Synchronization Signal.
More About
Primary Sidelink Synchronization Signal
The primary sidelink synchronization signal
(PSSS) is transmitted in the central 62 resource elements of two adjacent
SC-FDMA symbols in a synchronization subframe. The same sequence of
62 complex values is repeated in each of the symbols, resulting in
a 124-by-1 element vector returned by the ltePSSS
function.
The values of this sequence are ordered as they should be mapped into
the resource elements of the adjacent symbols using ltePSSSIndices
. If a terminal is transmitting
PSSS, then the PSSS should be sent every 40 ms with the exact subframe
dependent on the RRC signaled subframe number offset (syncOffsetIndicator-r12).
The PSSS is sent on antenna port 1020, along with the secondary sidelink synchronization signal (SSSS). A synchronization subframe also contains the PSBCH, which is sent on antenna port 1010. The transmission power of the PSSS symbols should be the same as the PSBCH therefore they should be scaled by in a subframe. No PSCCH or PSSCH transmission will occur in a sidelink subframe configured for synchronization purposes.
As specified in TS 36.211, Section 9.7, the PSSS identity assignment
depends on the network coverage. The set of all is
divided into two sets, id_net {0, ..., 167} and id_oon {168, ...,
335}, which are used by terminals that are in-network and out-of-network
coverage, respectively. The sidelink physical layer cell identity
number, ,
corresponds to the ltePSSS
input
UE settings structure field ue
.NSLID
.
Within each set, all identities result in the same PSSS. For an in-network
terminal, the ue
.NSLID
value
corresponds to the RRC sidelink synchronization signal identity (slssid-r12)
associated with the cell.
Primary Sidelink Synchronization Signal Indexing
Use the indexing function, ltePSSSIndices
, and the corresponding sequence
function, ltePSSS
, to populate
the resource grid for the desired subframe number. The PSSS values
are output by ltePSSS
, ordered
as they should be mapped, applying frequency-first mapping into the
resource elements of the adjacent symbols using ltePSSSIndices
.
When indexing is zero-based, the SC-FDMA symbols used are {1,2} for
normal cyclic prefix and {0, 1} for extended cyclic prefix.
Note
The indicated symbol indices are based on TS 36.211, Section 9.7. However to align with the LTE Toolbox™ subframe orientation, these indices are expanded from symbol index per slot to symbol index per subframe.
For more information on mapping symbols to the resource element grid, see Resource Grid Indexing.
References
[1] 3GPP TS 36.211. “Evolved Universal Terrestrial Radio Access (E-UTRA); Physical Channels and Modulation.” 3rd Generation Partnership Project; Technical Specification Group Radio Access Network. URL: https://www.3gpp.org.
Version History
Introduced in R2016b
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