OFDM on USRP2 as receiver and USRP N210 transmitter

I am trying to run the open source ofdm code , with USRP 2 as receiver
USRP N210 as transmitter at the center frequency 2.49G with RF board
2450 , transmitter is sending the data , but when I run usrp2_fft.py on
receiver i get http://old.nabble.com/file/p32662141/Screenshot-4.png

but when I run the code benchmark_ofdm_rx.py I don’t get any output ,
instead “SSSSSSSS” is printed on terminal. I have tried changing gain ,
decimation, but it was of no use.

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