4G/LTE - PHY Channel
PCFICH (Physical Control Format Indicator Channel)
< Overall Channel Processing >
The steps to process PCFICH (Converting CFI into physical symbols) is illustrated as follows. If you are interested seriously in details of physical layer channel processing, this can be one of the good place to start. It is much simpler than PDSCH or PBCH processing, but still has all the essense of channel processing.
If you want to have some hands-on this process and visualize the final result of this process, refer to Matlab : Toolbox : PCFICH.
< Information Carried by PCFICH >
With high level view, the information carried by PCFICH is simple. It is CFI number which can be 1 or 2 or 3. (For the detailed meaning and implication of CFI, refer to CFI page)
< Location of PCFICH >
Regardless of System Bandwidth, PCFICH is always carried by 4 REGs (16 REs) at the first symbol of each subframe. The exact location of these four REGs for PCFICH is determined by Physical Cell ID and System BW according to formula as shown below.