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大气激光通信中的信道时变特征估计研究 被引量:2
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作者 马艳梅 章科峰 《激光杂志》 北大核心 2020年第8期159-162,共4页
针对当前大气激光通信中的信道时变特征估计方法存在的一些不足,以获更优的大气激光通信效果,设计了一种新的大气激光通信信道时变特征估计方法。首先分析大气激光通信信道瞄准误差和信道中断概率分析,并分析发射端误差角随机抖动对接... 针对当前大气激光通信中的信道时变特征估计方法存在的一些不足,以获更优的大气激光通信效果,设计了一种新的大气激光通信信道时变特征估计方法。首先分析大气激光通信信道瞄准误差和信道中断概率分析,并分析发射端误差角随机抖动对接收端光强起伏的影响情况,建立大气激光通信信道传输矩阵,然后建立大气激光通信信道捕获模型,对发射功率与中断概率优化,并实现了大气激光通信信道时变特征估计,最后进行了大气激光通信信道时变特征估计仿真实验,结果表明,大气激光通信中的信道时变特征估计精度明显优于传统方法,能够提高大气激光通信信道数据传输成功率。 展开更多
关键词 人工智能技术 大气激光通信 信道中断 数据传输 决策树
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Wireless Relay Communication on High Speed Railway:Full Duplex or Half Duplex? 被引量:3
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作者 Jia You Zhangdui Zhong +2 位作者 Zhongzhao Dou Jing Dang Gongpu Wang 《China Communications》 SCIE CSCD 2016年第11期14-26,共13页
In this paper,we introduce one full-duplex(FD) relaying transmission scheme for high speed railway and compare its ergodic capacity and outage performance with half-duplex(HD) relaying scheme. Both decode-and-forward(... In this paper,we introduce one full-duplex(FD) relaying transmission scheme for high speed railway and compare its ergodic capacity and outage performance with half-duplex(HD) relaying scheme. Both decode-and-forward(DF) amplify-and-forward(AF) relay modes are considered. Moreover,the carriage penetration loss(CPL) and the self-interference(SI) cancellation ratio are investigated. We derive the closed-form expressions for the outage probability and ergodic capacity of both HD and FD relay transmission schemes. It is shown that when CPL is larger than a certain level,the FD relay can achieve better performance in terms of capacity and keep the outage probability in a low level. It is also found that three factors: AF or DF modes,CPL and SI cancellation ratio,can have impact on capacity performance,and that CPL is one decisive factor. Our results can provide theoretical supports for development and deployment of future wireless communication systems on high speed railways. 展开更多
关键词 full duplex relay high speed railway mobile relay outage probability channel capacity
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Cognitive amplify-and-forward dual-hop relay networks over α-μ fading channels 被引量:2
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作者 HAN Yan-bo GAO Li YAN Wen-hua 《Journal of Measurement Science and Instrumentation》 CAS CSCD 2019年第1期69-75,共7页
This paper provides an analytic performance evaluation of dual-hop cognitive amplify-and-forward (AF) relaying networks over independent nonidentically distributed (i.n.i.d.) fading channels. Two different transmit po... This paper provides an analytic performance evaluation of dual-hop cognitive amplify-and-forward (AF) relaying networks over independent nonidentically distributed (i.n.i.d.) fading channels. Two different transmit power constraint strategies at the secondary network are proposed to investigate the performance of the secondary network. In the case of combined power constraint,the maximum tolerable interference power on the primary network and the maximum transmit power at the secondary network are considered. Closed-form lower bound and its asymptotic expression for the outage probability (OP) are achieved. Utilizing the above results,average symbol error probability (ABEP) at high signal-to-noise ratios (SNRs) are also derived. In order to further study the performance of dual-hop cognitive AF relaying networks,the Closed-form lower bounds and asymptotic expressions for OP with single power constraint of the tolerable interference on the primary network is also obtained. Both analytical and simulation are employed to validate the accuracy of the theoretical analysis. The results show that the secondary network obtains a better performance when higher power constraint is employed. 展开更多
关键词 cognitive relay network amplify-and-forward relay outage probability α-μ fading channels
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Fundamental capacity for peak interference power constrained cognitive radio relay networks
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作者 谢先斌 Guo Wei Li Xinshan 《High Technology Letters》 EI CAS 2012年第2期173-178,共6页
A Cognitive radio communication link is possible to be interrupted easily when its physical channel suffers severe fading. Relay technology is an effective way to mitigate the fading effect of wireless channels in a n... A Cognitive radio communication link is possible to be interrupted easily when its physical channel suffers severe fading. Relay technology is an effective way to mitigate the fading effect of wireless channels in a network. Based on the highest achievable rate of the relay channels, this paper considers a cognitive radio relay network where the secondary transmitter communicates with the receiver through the best relay node under the peak power constraint of a primary receiver. Intuitively, the secondary transmission can benefit from an intermediate relay node chosen from N possible nodes. To quantify this benefit, outage probability of cognitive radio relay networks is derived and also the closed-form expressions for outage capacity and ergodic capacity of cognitive radio relay networks are obtained in Rayleigh fading channels. Numerical simulation results are provided to show that the outage capacity and ergodic capacity benefit tremendously by properly increasing the number of relaying nodes. 展开更多
关键词 cognitive radio relay networks (CRRN) outage probability outage capacity ergodic capacity peak interference power constrained
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