Opportunistic Spectrum Access for Energy-Constrained Cognitive Radios

被引:101
作者
Hoang, Anh Tuan [1 ]
Liang, Ying-Chang [1 ]
Wong, David Tung Chong [1 ]
Zeng, Yonghong [1 ]
Zhang, Rui [1 ]
机构
[1] ASTAR, Inst Infocomm Res, Singapore 138632, Singapore
关键词
Cognitive radio; spectrum sensing; false alarms; mis-detections; energy constraint; POMDP; MARKOV DECISION-PROCESSES; NETWORKS;
D O I
10.1109/TWC.2009.080763
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
This paper considers a scenario in which a secondary user (SU) opportunistically accesses a channel allocated to some primary network (PN) that switches between idle and active states in a time-slotted manner. At the beginning of each time slot, SU can choose to stay idle or to carry out spectrum sensing to detect the state of PN. If PN is detected to be idle, SU can carry out data transmission. Spectrum sensing consumes time and energy and introduces false alarms and mis-detections. The objective is to dynamically decide, for each time slot, whether SU should stay idle or carry out sensing, and if so, for how long, to maximize the expected reward. We formulate this as a partially observable Markov decision process and prove important properties of the optimal control policies. Heuristic control policies with low complexity and good performance are also proposed. Numerical results show the significant performance gain of our dynamic control approach for opportunistic spectrum access.
引用
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页码:1206 / 1211
页数:6
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