Journal of Communications and Networks

The Korean Institute of Commucations and Information Sciences (한국통신학회)
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Distributed Power and Rate Control for Cognitive Radio Networks

  • Wang, Wei (Wireless Signal Processing and Networking Lab, Key Laboratory of Universal Wireless Communication, Ministry of Education, Beijing University of Posts and Telecommunications(BUPT)) ;
  • Wang, Wenbo (Wireless Signal Processing and Networking Lab, Key Laboratory of Universal Wireless Communication, Ministry of Education, Beijing University of Posts and Telecommunications(BUPT)) ;
  • Zhu, Yajun (Datang Mobile Corporation) ;
  • Peng, Tao (Wireless Signal Processing and Networking Lab, Key Laboratory of Universal Wireless Communication, Ministry of Education, Beijing University of Posts and Telecommunications(BUPT))
  • Received : 2008.09.30
  • Published : 2009.04.30
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Abstract

In this paper, a distributed power and end-to-end rate control algorithm is proposed in the presence of licensed users. By Lagrangian duality theory, the optimal power and rate control solution is given for the unlicensed users while satisfying the interference temperature limits to licensed users. It is obtained that transmitting with either 0 or the maximum node power is the optimal scheme. The synchronous and asynchronous distributed algorithms are proposed to be implemented at the nodes and links. The convergence of the proposed algorithms are proved. Finally, further discussion on the utility-based fairness is provided for the proposed algorithms. Numerical results show that the proposed algorithm can limit the interference to licensed user under a predefined threshold.

Keywords

References

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