PCCC Decoder Combo- Ofdm

Hello,
I am usin OFDM Modulation and demodulation along with PCCC encoder and
PCCC decoder… I am using QPSK modulation in OFDM. But Pccc decoder
combo
also using Demodulation parameter Constellation and Dimension. is it
mean
that demodulating twice? how can I use OFDM Block with PCCC decoder?
Can anybody help me? I am new to this.

Thanks in Advance.

With Regards,
Salija.P