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Wireless services in the unlicensed bands are proliferating, but frequently face high interference from other devices due to a lack of coordination among heterogeneous technologies. In this paper, the authors study how cognitive radio concepts enable systems to sense and predict interference patterns and adapt their spectrum access accordingly. This leads to a new cognitive coexistence paradigm, in which cognitive radio implicitly coordinates the spectrum access of heterogeneous systems. Within this framework, they investigate coexistence with a set of parallel WLAN bands: based on predicting WLAN activity, the cognitive radio dynamically hops between the bands to avoid collisions and reduce interference.
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