Problem regarding EGC of OFDM modulated data

Hi
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)
http://gnuradio.4.n7.nabble.com/file/n38783/EGC.png

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
demodulator).
or specify a simple procedure to combine these files using a simple
algorithm.

Need Help

Regards
Bilal Abbasi


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