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首页> 外文期刊>EURASIP journal on advances in signal processing >Security-reliability performance of cognitive AF relay-based wireless communication system with channel estimation error
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Security-reliability performance of cognitive AF relay-based wireless communication system with channel estimation error

机译：带有信道估计误差的基于认知AF中继的无线通信系统的安全可靠性性能

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摘要

In this paper, both the security and the reliability performance of the cognitive amplify-and-forward (AF) relay system are analyzed in the presence of the channel estimation error. The security and the reliability performance are represented by the outage probability and the intercept probability, respectively. Instead of perfect channel state information (CSI) predominantly assumed in the literature, a certain channel estimation algorithm and the influence of the corresponding channel estimation error are considered in this study. Specifically, linear minimum mean square error estimation (LMMSE) is utilized by the destination node and the eavesdropper node to obtain the CSI, and the closed form for the outage probability and that for the intercept probability are derived with the channel estimation error. It is shown that the transmission security (reliability) can be improved by loosening the reliability (security) requirement. Moreover, we compare the security and reliability performance of this relay-based cognitive radio system with those of the direct communication system without relay. Interestingly, it is found that the AF relay-based system has less reliability performance than the direct cognitive radio system; however, it can lower the sum of the outage probability and the intercept probability than the direct communication system. It is also found that there exists an optimal training number to minimize the sum of the outage probability and the intercept probability.
机译：在本文中，分析了存在信道估计误差的情况下认知放大转发（AF）中继系统的安全性和可靠性。安全性和可靠性性能分别由中断概率和拦截概率表示。代替文献中主要假设的完美信道状态信息（CSI），本研究考虑了某种信道估计算法和相应信道估计误差的影响。具体地，目的地节点和窃听者节点利用线性最小均方误差估计（LMMSE）来获得CSI，并且利用信道估计误差来导出中断概率和截距概率的闭合形式。结果表明，通过放宽对可靠性（安全性）的要求可以提高传输的安全性（可靠性）。此外，我们将这种基于中继的认知无线电系统与没有中继的直接通信系统的安全性和可靠性性能进行了比较。有趣的是，发现基于AF中继的系统比直接认知无线电系统具有更低的可靠性。但是，与直接通信系统相比，它可以降低中断概率和拦截概率之和。还发现存在最佳训练次数以最小化中断概率和拦截概率之和。

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