Tuan Do

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— We consider wireless system consisting of secondary users equipped with cognitive radios that attempt to access radio spectrum that is not being used by the primary licensed users. To avoid causing harmful interference to the primary users, the secondary users perform spectrum sensing to determine spectrum hole opportunities for channel access. Due to(More)
—Cognitive radios hold tremendous promise for increasing spectral efficiency in wireless systems. In cognitive radio networks, secondary users equipped with frequency-agile cognitive radios communicate with one another via spectrum that is not being used by the primary, licensed users of the spectrum. We consider a cooperative communication scenario in(More)
— In a network with dynamic spectrum access, secondary users equipped with frequency-agile cognitive radios communicate with one another via spectrum that is not being used by the primary, licensed users of the spectrum. We consider a scenario in which a secondary transmitter can communicate with a secondary receiver via a direct communication link or a(More)
Human communication is a multimodal activity, involving not only speech and written expressions , but intonation, images, gestures, visual clues, and the interpretation of actions through perception. In this paper, we describe the design of a multimodal lexicon that is able to accommodate the diverse modalities that present themselves in NLP applications.(More)
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