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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...
Communication devices that employ adaptive transmission protocols can exploit good channel conditions to increase throughput and compensate for poor channels to enhance survivability. We examine the performance of a protocol for the combined adaptation of the modulation, error-control-code, and transmitter power in high-rate direct-sequence spread-spectrum systems. The protocol requires only simple...
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