lteNPBCH

Generate NPBCH symbols

Syntax

sym = lteNPBCH(enb,cw)

Description

sym = lteNPBCH(enb,cw) generates sym, a matrix containing the narrowband physical broadcast channel (NPBCH) symbols for cell-wide settings enb. The function generates the symbols by applying NPBCH encoding to and codeword cw, which comprises scrambling, QPSK modulation, layer mapping, and precoding in accordance with section 10.2.4 of [1].

Examples

Generate NPBCH Symbols

Generate NPBCH symbols using the MIB.

Generate the MIB and pass it through broadcast channel (BCH) encoding to obtain the 1600-bit codeword.

mib = randi([0 1],34,1);
cw = lteBCH(mib,1600,1);

Specify the cell-wide settings in the structure enb.

enb.NNCellID = 0;
enb.NBRefP = 1;
enb.NSubframe = 10;

Generate the NPBCH symbols for each of the subframes.

sym = lteNPBCH(enb,cw);

Input Arguments

enb — Cell-wide settings

structure

Cell-wide settings, specified as a structure containing these fields.

Parameter Field	Required or Optional	Values	Description	Data Types
NNCellID	Required	Nonnegative integer	NB-IoT physical layer cell identity	double
NBRefP	Required	1, 2	Number of narrowband reference signal antenna ports	double
NSubframe	Required	Nonnegative integer	Subframe number	double
NFrame	Optional	0 (default), nonnegative integer	Frame number	double

Data Types: struct

cw — Codeword to be modulated

binary-valued column vector

Codeword to be modulated, specified as a binary-valued column vector of length 1600.

Data Types: double | logical

Output Arguments

sym — NPBCH symbols

100-by-P complex matrix

NPBCH symbols, returned as a 100-by-P complex valued matrix, where 100 is the number of modulation symbols for one antenna port for one subframe, and P is the number of transmission antenna ports.

Data Types: double
Complex Number Support: Yes

References

[1] 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). https://www.3gpp.org.

Version History

Introduced in R2019b