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ltePSBCH

Physical sidelink broadcast channel

Description

sym = ltePSBCH(ue,cw) returns a column vector containing the physical sidelink broadcast channel (PSBCH) symbols for the specified UE settings structure and PSBCH codeword bits. The function performs PSBCH-specific scrambling, QPSK modulation, and SC-FDMA transform precoding, as defined in TS 36.211 [1], Section 9.6. For more information, see Physical Sidelink Broadcast Channel Processing.

example

Examples

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Create a codeword using the SL-BCH transport channel and encode the bits on the PSBCH.

ue.NSLID = 1;
ue.CyclicPrefixSL = 'Normal';
codeword = lteSLBCH(ue,zeros(40,1));
symbols = ltePSBCH(ue,codeword);

The plot shows the effects of the SC-FDMA precoding on the QPSK modulation symbols.

plot(symbols,'o')

Figure contains an axes object. The axes contains a line object which displays its values using only markers.

Input Arguments

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User equipment settings, specified as a parameter structure containing this field:

Physical layer sidelink synchronization identity, specified as an integer from 0 to 355. (NIDSL)

Data Types: double

Data Types: struct

PSBCH codeword, specified as a vector that must be a multiple of 144 bits in length. Since the PSBCH is QPSK modulated, there are 2 bits per symbol. Nominally, the length of cw is 2*NRE bits, specifically 1152 bits for normal cyclic prefix or 864 for extended cyclic prefix. For V2X sidelink mode, the nominal length will be 1008 bits corresponding to 504 resource elements (it is defined for normal cyclic prefix only).

NRE is the number of resource elements in a subframe, including the SC-FDMA guard symbol, and is a multiple of 72. Nominally, NRE is 576 for normal cyclic prefix or 432 for extended cyclic prefix. For V2X sidelink mode, the nominal length will be 504 resource elements (it is defined for normal cyclic prefix only).

Data Types: double

Output Arguments

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Modulated PSBCH symbols, returned as an NRE-by-1 column vector.

NRE is the number of resource elements in a subframe, including the SC-FDMA guard symbol, and is a multiple of 72. Nominally, NRE is 576 for normal cyclic prefix or 432 for extended cyclic prefix. For V2X sidelink mode, the nominal length will be 504 resource elements (it is defined for normal cyclic prefix only).

Data Types: double
Complex Number Support: Yes

More About

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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