Fundamental limits of spectrum-sharing in fading environments
IEEE Transactions on Wireless Communications
On cognitive radio networks with opportunistic power control strategies in fading channels
IEEE Transactions on Wireless Communications
A rate-splitting approach to the Gaussian multiple-access channel
IEEE Transactions on Information Theory
Achievable rates in cognitive radio channels
IEEE Transactions on Information Theory
Asymptotically Optimal Multiple-Access Communication Via Distributed Rate Splitting
IEEE Transactions on Information Theory
Cognitive radio: brain-empowered wireless communications
IEEE Journal on Selected Areas in Communications
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Rate control and power control are two important issues in cognitive radio networks. In this paper, three rate control strategies are first introduced, namely Dirty Paper Coding (DPC) strategy, Noise strategy, and Opportunistic Interference Cancellation (OIC) strategy. The achievable rates of the three strategies are also compared. Then, optimal power control algorithms are proposed, each corresponding to one rate control strategy. The algorithms achieve the maximum transmit rate for the cognitive user by appropriately controlling the transmit power on each subchannel under the interference temperature constraint of the primary user. Simulation results show that the proposed algorithms can dramatically improve the transmit rate of cognitive user.