The Windowing of USRP

[LZF]

Hi all,

    I am using LabVIEW for a OFDM communicaiton system using USRP-2920. Actually I met a problem that the spectrum of received symbols is distorted like this:

    In fact my expected spectrum should be like this:

    I guess that it is added a window by USRP, but I cannot exactlly know what the window is and how to overcome the distortion.

Appreciate for your help.

LZF