Research Article
Optimal power allocation in joint spectrum underlay and overlay cognitive radio networks
@INPROCEEDINGS{10.1109/CROWNCOM.2009.5189342, author={Haipeng Yao and Zheng Zhou and He Liu and Luyong Zhang}, title={Optimal power allocation in joint spectrum underlay and overlay cognitive radio networks}, proceedings={4th International ICST Conference on Cognitive Radio Oriented Wireless Networks and Communications}, publisher={IEEE}, proceedings_a={CROWNCOM}, year={2009}, month={8}, keywords={Spectrum sharing strategy cognitive radio interference constrains optimal power allocation.}, doi={10.1109/CROWNCOM.2009.5189342} }- Haipeng Yao
Zheng Zhou
He Liu
Luyong Zhang
Year: 2009
Optimal power allocation in joint spectrum underlay and overlay cognitive radio networks
CROWNCOM
IEEE
DOI: 10.1109/CROWNCOM.2009.5189342
Abstract
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.