# Re: PCCC Decoder Combo- OFDM

**URL:** <https://www.ruby-forum.com/t/re-pccc-decoder-combo-ofdm/242574>\
**Category:** GNU Radio\
**Created:** [July 3, 2015, 6:53pm UTC](https://www.ruby-forum.com/t/re-pccc-decoder-combo-ofdm/242574 "2015-07-03T18:53:07Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![musicdenotation](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/ea666f/32.png) [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\
**Post date:** [July 3, 2015, 6:53pm UTC](https://www.ruby-forum.com/t/re-pccc-decoder-combo-ofdm/242574/1 "2015-07-03T18:53:07Z")

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Pccc decoder combo requires the modulation as a parameter because  
it needs to evaluate soft decisions from the noisy complex QPSK signal  
that  
it receives.

In that sense, it is NOT doing demodulation, as it is not supposed to…

I don’t know what the OFDM demodulator does, but if there is a way to  
get  
the  
frequency/phase corrected QPSK signal out of it then you can feed it to  
the pccc decoder (with appropriate “scaling” parameter) and perform  
decoding.

Achilleas