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I attended Douglas Sicker's colloquium on Advances in Cognitive Radio Networks (11/29/2007) Dr. Sicker started the presentation with some interesting comparison between radio frequency spectrum allocation and typical spectrum occupancy (the usable spectrum are almost fully allocated, while typical occupancy is very low). This motivates the work on building radios that can communicate on a broad spectrum and efficiently utilizing unoccupied spectrum while respecting rules on spectrum usage. He presented a number of challenges to building such radio: interference avoidance, detection, and computational complexity. An huge array of parameters were evaluated for experiments on how to address some of the issues like varying quality of service, radio transmission power and radio frequency. As there are many varying patterns for positioning even a few radios in a 2 dimensional space, coupled with the number of parameters that can possibly influence the outcome, perform actual testing (or even running simulation) of all the possible combinations of scenarios has been an extreme challenge. Some preliminary result showed intelligent transmission power adjustment can provide considerable overall bandwidth improvement. Last modified 12 December 2007 at 12:51 am by shumin |