卫星认知无线网络中频谱感知与分配策略设计

来源期刊:中南大学学报(自然科学版)2015年第12期

论文作者:肖楠 梁俊 王伟 张衡阳 尹泽

文章页码:4520 - 4529

关键词:卫星通信,认知无线电,频谱感知,频谱分配,冲撞概率

Key words:satellite communication; cognitive radio; spectrum sensing; spectrum allocating; probability of collision

摘    要:针对传统认知无线电频谱感知技术直接应用于卫星网络时存在感知效率低、频谱冲撞加剧的问题,提出一种适用于卫星认知无线网络的频谱感知与分配策略。该策略以卫星作为频谱感知的中心节点,利用卫星覆盖的广域性实现对多个频谱的同时检测;卫星在对空闲频谱的有效性进行分析后将频谱感知的最终结果告知地面认知基站,认知基站结合认知用户的业务传输需求与频谱空闲持续时长概率密度特性确定频谱可用度,从而指导认知用户选择接入最佳频谱进行业务传输。仿真结果表明:该策略能够在广域空间内实现对多个频谱状态的并行感知,提高了频谱感知的效率,同时减小了认知用户与授权用户的频谱冲撞概率。

Abstract: A spectrum sensing and allocating strategy suitable for cognitive satellite network was proposed in allusion to the problems of lower efficiency and higher spectrum collision probability because of the direct application of traditional spectrum sensing technology in satellite network. Taking satellite as the center node of spectrum sensing, the multi-spectrum detecting was simultaneously realized by the advantage of wide-area coverage ability of satellite. The validity of the spectrums was analyzed firstly which were determined as idle, and the final spectrums sensing results were notified to the base station of cognitive radio network. The base station of cognitive radio network conducts cognitive users to select and access the optimized spectrum according to the calculated availability degree of spectrums based on traffic transmitting demands of cognitive users and probability density characters of idle state duration time of spectrum. The results indicate that the proposed strategy successfully realizes the multi-spectrum simultaneous detecting and improved the efficiency of spectrum sensing, and that the probability of spectrum collision between cognitive users and authorized users is decreased.

相关论文

  • 暂无!

相关知识点

  • 暂无!

有色金属在线官网  |   会议  |   在线投稿  |   购买纸书  |   科技图书馆

中南大学出版社 技术支持 版权声明   电话:0731-88830515 88830516   传真:0731-88710482   Email:administrator@cnnmol.com

互联网出版许可证:(署)网出证(京)字第342号   京ICP备17050991号-6      京公网安备11010802042557号