基于Markov方法的空时频谱空穴的联合感知和接入  

Joint sensing and access for special-temporal spectrum holes based on Markov approach

作　　者：李小强[1] 贝艳 李颖 赵炜铭 李彦军 

机构地区：[1]解放军理工大学通信工程学院 [2]济南军区装备部 [3]中国电子设备系统工程公司研究所 [4]中国兵器工业新技术推广研究所 [5]解放军68241部队

出　　处：《高技术通讯》2014年第3期244-250,共7页Chinese High Technology Letters

基　　金：973计划(2009CB320403)资助项目

摘　　要：为改善频谱利用效率,把Markov方法引入到和位置相关的机会式频谱接入系统模型中。推导了各个信道状态的稳态概率,研究了各稳态概率随虚报概率的变化规律,在此基础上,根据频谱空穴的感知准确度与主、次用户相对位置的关系,在不同的主用户区域采用不同的约束条件对次级用户的吞吐量进行优化,以充分利用空时频谱空穴。根据以上研究,提出了一种新颖的基于Markov方法的空时频谱空穴的联合感知和接入方案。理论分析和数值计算表明,该方案能有效利用频谱空穴的空时特性,极大地提高频谱利用率。A Markov approach was applied to a location related opportunistic spectrum access （OSA）system to improve the spectrum utilization. The steady-state probability of each channel state was derived, and the variation of the steady-state probability with false alarm probability was studied. According to the relationship between the accuracy of sensing spatial-temporal spectrum holes and the relative position of primary users and secondary users, the throughput of secondary users was optimized by adopting different constraint conditions in different primary regions so as to make full use of spatial-temporal spectrum holes. At last, a novel scheme for joint sensing and access for spatial-temporal spectrum holes based on the Markov approach was proposed. The results of theoretical analysis and numerical computation show that the scheme takes efficient advantage of the spatial-temporal characteristics of the spectrum holes, greatly improving the spectrum utilization efficiency.

关 键 词：频谱感知 动态频谱接入(DSA) 空时频谱空穴 MARKOV链 

分 类 号：TN925[电子电信—通信与信息系统]