= Wideband Software Extensible Radio Platform (WiSER) = [[TOC(wiser*, depth=2)]] Dynamic spectrum access technology has the potential for order-of-magnitude improvement in spectrum efficiency necessary to cope with the recent explosion of mobile data traffic. Cognitive radio systems will also provide improved connectivity to end users, and enable new applications such as emergency response systems and automotive networks. This project will directly inform these important societal needs by enabling the research community to build state-of-the-art experimental systems for evaluation of these emerging technologies. The WiSER design significantly leverages prior design and development work on experimental SDR platforms funded by NSF ProWin (2003-2008) and [wiki:/crkit GENI (2009-2011)]. It aims at enabling a richer range of experimental dynamic spectrum research supporting operation across 100MHz-6000MHz in >125MHz increments, hardware acceleration for real-world PHY waveforms at speeds of 100 Mbps and higher, hardware virtualization capable of supporting multiple radios on the same platform, and an open-source software toolkit.