= Spectrum sensing with USRP2 = == Description == In this tutorial we'll use the USRPs on the grid for FFT-based spectrum sensing. Each USRP (centered on a frequency with specified bandwidth) will collect data into an OML server for post processing. For details on available USRP2s on the grid, please see [http://www.orbit-lab.org/wiki/Documentation/USRP2_hw_map available USRP2 HW]. == Hardware / Software Resources utilized == 1. Grid nodes with a USRP2 connect via Ethernet. 2. ''ubuntu-11-10-gnuradio.ndz'': disk image loaded onto nodes. This image has all the precompiled - software required to configure the USRPs and analyze recorded data. The USRP2's interface with the node is already configured. 3. omf-5.3: used to image to nodes