Documentation

ltePBCH

Physical broadcast channel

Syntax

Description

example

sym = ltePBCH(enb,cw) returns a matrix containing the complex symbols of the Physical Broadcast Channel (PBCH) for cell-wide settings structure, enb, and codeword, cw. The function performs all physical channel processing steps, including the stages of scrambling, QPSK modulation, layer mapping, and precoding as defined in TS 36.211 [1], Section 6.6.

The BCH transport channel consumes information bits every 40 ms. The coded transport block is then passed to PBCH for physical channel processing. The PBCH is transmitted in the first subframe of every frame, so four successive frames are required to transmit one transport block. As the scrambling sequence is initialized at the boundary of every 40 ms, this function expects 40 ms worth of data. For example, it expects 1920 bits for normal cyclic prefix, or 1728 bits for extended cyclic prefix. Demultiplex the output of this function into quarter length blocks for carriage on the first subframe in each 10 ms frame.

Examples

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Generate PBCH Symbols

Generate physical broadcast channel (PBCH) symbols using the master information block (MIB).

Create cell-wide configuration structure initialized to RMC R.0. Generate the MIB. Pass the MIB through broadcast channel (BCH) transport channel coding.

enb = lteRMCDL('R.0');
mib = lteMIB(enb);
bchCoded = lteBCH(enb,mib);

Generate and display the PBCH symbols.

pbchSymbols = ltePBCH(enb,bchCoded);
pbchSymbols(1:10)
ans =

   0.7071 + 0.7071i
   0.7071 - 0.7071i
   0.7071 + 0.7071i
  -0.7071 + 0.7071i
  -0.7071 + 0.7071i
   0.7071 + 0.7071i
  -0.7071 + 0.7071i
  -0.7071 + 0.7071i
  -0.7071 + 0.7071i
  -0.7071 - 0.7071i

Input Arguments

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enb — Cell-wide settingsstructure

Cell-wide settings, specified as a structure. enb must contain the following fields.

NCellID — Physical layer cell identityscalar integer

Physical layer cell identity, specified as a scalar integer.

Data Types: double

CellRefP — Number of cell-specific reference signal antenna ports1 | 2 | 4

Number of cell-specific reference signal antenna ports, specified as 1, 2, or 4.

Data Types: double

Data Types: struct

cw — PBCH codewordvector

PBCH codeword, specified as a vector. cw contains the bit values of the PBCH codeword for modulation.

Data Types: double | single | uint8 | uint16 | uint32 | uint64 | int8 | int16 | int32 | int64

Output Arguments

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sym — PBCH symbolsnumeric matrix

PBCH symbols, returned as a numeric matrix. sym contains the complex symbols of the Physical Broadcast Channel (PBCH) for cell-wide settings, enb, and codeword, cw. Its size is N-by-CellRefP, where N is the number of modulation symbols for one antenna port and CellRefP is the number of 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). URL: http://www.3gpp.org.

[2] 3GPP TS 36.101. "User Equipment (UE) Radio Transmission and Reception." 3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (E-UTRA). URL: http://www.3gpp.org.

Introduced in R2014a

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