PBCH modulationV15.8.0

Toolbox: PBCH signal generator
ParameterValue
v
Input bits (0,1,...)
scrambling seq (0,1,...)
scrambled bits (0,1,...)
Modulation schemeQPSK
Modulated signal

Scrambling

The UE shall assume the block of bits b(0), ..., b(Mbit-1), where Mbit is the number of bits transmitted on the physical broadcast channel, is scrambled prior to modulation, resulting in a block of scrambled bits according to

where the scrambling sequence c(i) is given by scrambling. The scrambling sequence generator shall be initialized with at the start of each SS/PBCH block where

  • for Lmax=4, v is the two least significant bits of the SS/PBCH block index
  • for Lmax=8 or Lmax=64, v is the three least significant bits of the SS/PBCH block index

with Lmax being the maximum number of SS/PBCH blocks in an SS/PBCH period for a particular band as given by TS 38.104.


Modulation

The UE shall assume the block of bits are QPSK modulated as described in modulation, resulting in a block of complex-valued modulation symbols dPBCH(0),...,dPBCH(Msymb-1).


Mapping to physical resources

TBD