Technical Note: \cal Q-Learning
Machine Learning
Dynamic Spectrum Access with QoS and Interference Temperature Constraints
IEEE Transactions on Mobile Computing
Docitive networks: an emerging paradigm for dynamic spectrum management
IEEE Wireless Communications
IEEE Transactions on Communications
Source-Channel-Cooperation Tradeoffs for Adaptive Coded Communications [Transactions Papers]
IEEE Transactions on Wireless Communications
Cross layer design for equal and unequal loss protection frameworks in cognitive radio networks
Computers and Electrical Engineering
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The central problem in cognitive radio (CR) is how to adapt, given a wireless environment, so as to operate while meeting the constraints of a primary incumbent in a spectrum band. Adaptation for transmission of real-time multimedia lends itself to a cross-layer approach. This paper discusses a cross-layer CR scheme for real-time multimedia transmission that jointly adapt transmit bit rate and source-channel coding when sharing the spectrum with a primary network through DS-CDMA. While a cross-layer approach results in a notable reduction in distortion and congestion rate, it increases the complexity of the algorithm. This issue is addressed by introducing a novel cross-layer cooperative scheme that without performance loss reduces by as much as thirty times the number of iterations needed to achieve convergence by the cognitive algorithm. This scheme extends to a cross-layer setting, the docitive paradigm, by having secondary nodes share with a newcomer node their learned awareness of the environment and the associated results for actions.