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In many dynamic spectrum access networks, it is necessary for secondary users to monitor the frequency band in which they are communicating so that they can determine if the primary user has begun transmission. Traditional sensing methods require the transmitters of the secondary users to be silent while spectrum monitoring is performed. Statistics that are derived easily in a communications receiver...
Cognitive radios that are employed in a network with dynamic frequency assignments must operate efficiently in the presence of uncertainties and variations in the propagation characteristics of the network's communication links. A low-complexity adaptive transmission protocol is described and evaluated for use in cognitive radio networks whose links have unknown and possibly time-varying propagation...
When a frequency band has been selected for a session in a dynamic spectrum access network, the initial choices for the modulation and coding must be consistent with the bandwidth that is available and the session's quality-of-service priorities. A measure of resource consumption is developed for use in the selection of the code-modulation combination. The resource- consumption metric accounts for...
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