Optimization of Learning Time for Learning-Assisted Rendezvous Channel in Cognitive Radio System
Optimization of Learning Time for Learning-Assisted Rendezvous Channel in Cognitive Radio System
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DOI：
10.1587/transcom.e98.b.360
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发表时间：
2015-02
期刊：
影响因子：
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通讯作者：
O. Takyu;Takayuki Yamakita;T. Fujii;M. Ohta;F. Sasamori;S. Handa
中科院分区：
文献类型：
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作者：
O. Takyu;Takayuki Yamakita;T. Fujii;M. Ohta;F. Sasamori;S. Handa
本文导出了学习辅助交会信道的最优学习时间。认知无线电动态频谱接入系统存在的一个问题是两个无线终端之间的接入信道不匹配。在学习辅助交会信道中，在交换分组进行链路连接之前，在学习时间内估计其他系统占用信道的比率；它被称为通道占用率（COR）。高速分组交换是通过选择低COR通道实现的。然而，最优学习时间和预估误差的影响尚未明确。本文分析了到达交会信道的时间（TTR），其中TTR是在一定概率下完成交会所需的时间。结果表明，学习时间与TTR呈凹形关系，可以确定最优学习时间。
SUMMARY This paper derives the optimal learning time for the learning-assisted rendezvous channel. One problem with the dynamic spectrum access system of cognitive radio is access channel mismatch between two wireless terminals. In the learning-assisted rendezvous channel, before exchanging packets for link connection, the rate of channel occupancy by the other system is estimated within the learning time; it is referred to as the channel occupancy rate (COR). High speed packet exchange is made possible by selecting a low COR channel. However, the optimal learning time and the impact of COR estimation errors have not been clarified yet. This paper analyzes the time to rendezvous channel (TTR), where TTR is the time needed to complete the rendezvous with a certain probability. The results indicate that the learning time and TTR have a concave relationship which means that the optimal learning time can be determined.