Can't rececive OFDM symbol using AD9363

i want to transmit and recevie ofdm sysmbols with pluto on simullink but had diffrent result copare to witout pluto

-without pluto and awgn channel

set snr:30DB  (left spctrum :tx, right spectrum:rx)


-with pluto

this is my simulink block and setting values pluto blocks

 my result  spectrum and demodulated constellation ,and high BER

do i add other Blocks? or Filters?

How can i do... plz 

Your opinion will be of great help.