[Discuss-gnuradio] How to use FEC block in GRC?

Hi, I'm making a program which I attached to the mail.

How can I put fec block (ex. En/Decode CCSDS 27, Viterbi Combo) to these

block diagrams?

#Sender

vlc -> udp source -> ofdm modulation -> usrp

#Receiver

usrp -> ofdm demod -> udp sink -> vlc

Speck of SW and HW are below.

#GNU Radio: ver 3.7.0

UHD：ver 003.005.003

USRP：N200

Daughter Board：XCVR2450 2.4GHz-5.0GHz

##Sender

CPU(Host): Xeon

Virtual Box：ubuntu12.04LTS

Memory: 25GByte

##Reciever

CPU(Host): Xeon

Virtual Box：ubuntu12.04LTS

Memory: 25GByte

Sender and Reciever are connected to the same PC.

#Others

Distance between antenna: 1[cm]

Thanks.

Mitsu