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Optimal power allocation in joint spectrum underlay and overlay cognitive radio networks

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4 Author(s)
Haipeng Yao ; Key Lab. of Universal Wireless Commun., Beijing Univ. of Posts & Telecommun., Beijing, China ; Zheng Zhou ; He Liu ; Luyong Zhang

In this paper, we investigate the optimal power allocation strategy in the joint spectrum overlay and underlay cognitive radio network where a licensee and multiple unlicensed users coexist and operate in the same spectrum. We propose an optimal power allocation scheme which achieves the maximum system utility while satisfying the QoS requirement of SUs and interference constrains of the PU. Particularly, since the unlicensed users adopting the overlay strategy do not necessarily have perfect sensing knowledge regarding the licensee, we modify the optimal power allocation scheme with the imperfect sensing knowledge. Moreover, we propose a QoS sensitivity based admission control algorithm to deal with the case that the optimal power allocation scheme is infeasible. The simulation results show that the proposed algorithm achieves better performance.

Published in:

Cognitive Radio Oriented Wireless Networks and Communications, 2009. CROWNCOM '09. 4th International Conference on

Date of Conference:

22-24 June 2009