Sensing-energy efficiency tradeoff for cognitive radio networks

被引:19
作者
Zhang, Jing [1 ,2 ]
Zheng, Fu-Chun [1 ,3 ]
Gao, Xi-Qi [1 ]
Zhu, Hong-Bo [2 ]
机构
[1] Southeast Univ, Natl Mobile Commun Res Lab, Nanjing 210096, Jiangsu, Peoples R China
[2] Nanjing Univ Posts & Telecommun, Key Lab Wireless Commun Jiangsu Prov, Nanjing 210003, Peoples R China
[3] Univ Reading, Sch Syst Engn, Reading RG6 6AY, Berks, England
基金
中国博士后科学基金;
关键词
WIRELESS COMMUNICATIONS; POWER ALLOCATION; DESIGN;
D O I
10.1049/iet-com.2014.0400
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
In this study, the authors focus on the tradeoff between spectrum sensing and energy efficiency of cognitive radio networks (CRN). Considering two interference-avoidance schemes, that is, channel handoff and stop-and-wait, the authors, respectively, model the energy efficiency (EE) of CRN as the mean of the throughput-to-power ratio. Research shows that stop-and-wait scheme is a special case of channel handoff from an EE perspective. Based on the proposed EE model, the authors build up an EE optimisation problem under the constraint of the sensing quality, and formulate the sensing-energy efficiency tradeoff (SET) for CRN. The similarity and difference between the SET and the sensing-throughput tradeoff are also investigated. Simulation analysis confirms that there is indeed an optimal sensing time to make the EE maximum, and it is larger than that for maximum throughput. Another interesting result is that the EE and the throughput of CRN can be enhanced together by optimising MAC frame structure in combination with sensing bandwidth adjustment and power control. Our work provides some insights for green CRN in view of MAC frame optimisation.
引用
收藏
页码:3414 / 3423
页数:10
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