| 认知无线电系统基于信道选择的动态接入方法研究 |
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| 引用本文： | 张国斌.认知无线电系统基于信道选择的动态接入方法研究[J].南京邮电大学学报(自然科学版),2014(4):99-103. |
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| 作者姓名： | 张国斌 |
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| 作者单位： | 东莞理工学院电子工程学院,广东东莞523808 |
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| 基金项目： | 国家自然科学基金（61300198）和东莞理工学院博士科研启动基金（ZJ121204）资助项目 |
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| 摘 要： | 针对认知无线电系统各信道的增益和可用时长的不同,研究认知无线电用户接入网络时的信道选择机制.首先设计两种信道选择机制,分别选择信道增益最大的和空闲时间最长的信道进行接入,然后综合考虑信道增益和空闲时长两种因素,通过控制认知用户在各信道的接入概率达到系统容量的最优化,最后在最优化算法的基础上设计相关的比较参数进行信道的选择,从而得到次优化选择结果.仿真表明,次优化算法与最优化算法性能接近,具有较好的系统容量特性和较低的中断概率.
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| 关 键 词： | 认知无线电 信道选择 接入机制 |
Dynamic Access Method for Cognitive Radio System Based on Channel Choosing |
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| ZHANG Guo-bin.Dynamic Access Method for Cognitive Radio System Based on Channel Choosing[J].Journal of Nanjing University of Posts and Telecommunications,2014(4):99-103. |
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| Authors: | ZHANG Guo-bin |
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| Institution: | ZHANG Guo-bin(College of Electronic and Engineering, Dongguan University of Technology, Dongguan 523808, China) |
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| Abstract: | A channel choosing scheme in dynamic access of cognitive users is researched.Firstly,two channel choosing methods are designed,which choose the channel with the largest channel gain and the longest spare time to access,respectively.And then the two factors of the channel gain and spare time length are considered at the same time and the access probability of cognitive users in each channel is controlled to optimize the system capacity.Finally,the correlative comparison parameter based on the optimized method is designed for channel choosing to gain the sub-optimal result.The simulation result indicates that the performance of the sub-optimal method is close to that of the optimal method,thus it has the optimized system capacity and lower dropping probability. |
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| Keywords: | cognitive radio channel choosing access scheme |
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