r its user. quired to provide some of the useful and economically Improved performance or new capabilities may be pro- important CR functions already exist, SO some of these vided. As the CR's smart agent model of the world be- features should begin to appear within the timeline of the comes more sophisticated and realistic, situational next development cycle. awareness will increase. As the models improve, the The bottom line is that the enabling technology for CR ability of the CR to act effectively over a broader range of applications is available. There is interest in integrating user services will improve. the technologies to build cognitive applications. Finally, Maybe the most important software technology is the emergence of CRs and their cognitive applications is a policy engine that enables a CR to know how to behave imminent. References [1] Federal Communications [11] http://www.fas.org/man/dod-101 [23] http://www.gdc4s.com/ Commission, Notice of Proposed /sys/ac/equip/csel.htm [24] http://jtrs.army.mil/ Rule Making, August 12, [12] www.jcs.mil/j6/cceb/ [25] http://www.gnu.org/software/ 2000. jtidsmidswgnotebookjune2005.pdf gnuradio [2] http://www.fas.org/man/dod-101/ [13] http://www.fas.org/man/dod-101/ [26] http://vanu.com/technology/ sys/land/sincgars.htm sys/ac/equip/an-arc-210.htm softwareradio.html [3] http://www.fas.Org/man/dod-101/ [14] http://www.afcea.org/signal [27] J. Polson, "Cognitive Radio sys/land/.htm [15] http://www.fas.org/man/dod-101/ Applications in Software Defined [4] http://www.fas.org/spp/military/ sys/land/eplrs.htm Radio," in Software Defined Radio program/com/an-wsc-3.htm [16] http://www.nj7p.org/history/ Forum Technical Conference and [5] http://www.fas.org/man/dod-101/ portable/html Product Exposition, Phoenix, AZ, sys/ac/equip/an-arc-164.htm [17] http://raytheon.com/products/jtt_ November 15-18, [6] http://www.fas.org/man/dod-101/ 2004. cibs/ sys/ac/equip/an-arc-220.htm [18] http://www.acd.itt.com/case4.htm [28] H. Chen, S. Kumar and C.-C. Jay [7] http://www.harris.com/ K