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Cognitive Radio
Growing numbers of people are making a habit of toting their laptops into Starbuck's, ordering half-caf skim lattes, and plunking down in chairs to surf the Web wirelessly. That means more people are also getting used to being kicked off the Net as computers competing for bandwidth interfere with one another. It's a local effect -- within 30 to 60 meters of a transceiver -- but there's just no more space in the part of the radio spectrum designated for...