By describing the efforts of a team of CR and CN researchers
with Wireless @ Virginia Tech, we have demonstrated
the breadth of approaches required to address
the challenges of CRs and CNs. To achieve the promise of
CRs and CNs, researchers with a wide range of expertise
must work together to create complex, coordinated systems.
In particular, a research team must address the
application-specific artificial intelligence challenges at the
heart of a cognitive system without neglecting the myriad
of radio hardware, algorithmic, networking, and analysis
challenges raised by the creation of autonomous radio and
network nodes. Beyond the technical challenges, impacts
of policy considerations and the needs of radio system
users must also be kept close at hand.