| 认知无线电系统中检测时间和检测周期的联合优化 |
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| 引用本文： | 张传奇,卞荔,朱琦. 认知无线电系统中检测时间和检测周期的联合优化[J]. 南京邮电大学学报(自然科学版), 2011, 31(1): 16-22 |
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| 作者姓名： | 张传奇 卞荔 朱琦 |
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| 作者单位： | 南京邮电大学,江苏省无线通信重点实验室,江苏,南京,210003;南京邮电大学,教育部宽带无线通信与传感网技术重点实验室,江苏,南京,210003 |
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| 基金项目： | 国家重点基础研究发展计划(973计划)(2007CB310607); 国家自然科学基金(60772062); 国家科技重大专项(2011ZX03001-006-02,2011ZX03005-004-03)资助项目 |
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| 摘 要： | 认知无线电中频谱感知是实现动态频谱接入的重要前提和核心环节,检测时间和检测周期是频谱感知算法中非常重要的两个参数,它们的取值直接影响了频谱空穴的检测概率和主次用户的碰撞概率。从最大化次用户的平均频谱利用率出发,在目标检测概率的限制下,提出了检测时间和检测周期联合优化的二维单目标最优化问题,基于能量检测,建立了联合优化的数学模型,并进行了理论推导和分析,找到了使认知系统频谱利用率最大的检测时间和检测周期求解方法。通过与仿真结果的比较,验证了理论推导的正确性。仿真结果表明,次用户频谱利用率分别随检测时间及检测周期的增加先增大后减小,存在使次用户频谱利用率最大的最优值。
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| 关 键 词： | 认知无线电 检测周期 检测时间 频谱利用率 优化 |
Joint Optimization of Sensing Period and Sensing Interval in Cognitive Radio Networks |
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| ZHANG Chuan-qi,BIAN Li,ZHU Qi. Joint Optimization of Sensing Period and Sensing Interval in Cognitive Radio Networks[J]. JJournal of Nanjing University of Posts and Telecommunications, 2011, 31(1): 16-22 |
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| Authors: | ZHANG Chuan-qi BIAN Li ZHU Qi |
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| Affiliation: | ZHANG Chuan-qi1,2,BIAN Li1,ZHU Qi1,2 1.Jiangsu Key Laboratory of Wireless Communications,Nanjing University of Posts and Telecommunications,Nanjing 210003,China 2.Key Lab on Wideband Wireless Communications and Sensor Network Technology of Ministry of Education,China |
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| Abstract: | Sensing/monitoring of spectrum-availability has been identified as a key requirement for dynamic spectrum allocation in cognitive radio networks(CRNs).Sensing duration and sensing interval are two significant parameters associated with spectrum sensing,which directly affect the detection probability of available spectrum and the collision probability of the primary and secondary users.In this paper,a two-dimensional single-objective optimization problem of sensing period and sensing interval is proposed und... |
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| Keywords: | cognitive radio sensing period sensing interval spectrum utilization optimization |
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