Problem regarding EGC of OFDM modulated data

I am trying to implement cooperative communication using USRP2.
i have following scenario.

Time slot 1:
S.dat (source data) --> OFDM modulation --> USRP Sink (Transmitter)
USRP source --> File Sink(SR.dat, Relay node)
USRP source --> File Sink (SD.dat ,Receiver)

Time slot 2:
SR.dat (relay data) --> USRP Sink (Relay Transmitter)
USRP source --> File Sink(RD.dat, Receiver)

how can i add these two files (SD.dat,RD.dat) using EGC…help me out.
as i m not getting correct data after combining (as no output at
or specify a simple procedure to combine these files using a simple

Need Help

Bilal Abbasi

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