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可变速率HARQ-IR辅助太赫兹通信系统的可靠性分析 认领 引用
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作者 窦庆萍 何富超 +4 位作者 张益 李永康 施政 杨光华 马少丹 《无线电通信技术》 北大核心 2026年第1期107-117,共11页
严重的路径损耗、天线对不准以及大气湍流等造成太赫兹通信可靠性下降,利用混合自动重发请求(Hybrid Automatic Repeat Request,HARQ)技术可以有效解决其可靠性问题。为更高效利用太赫兹通信的宽带无线资源,提出一种可变速率HARQ增量冗... 严重的路径损耗、天线对不准以及大气湍流等造成太赫兹通信可靠性下降,利用混合自动重发请求(Hybrid Automatic Repeat Request,HARQ)技术可以有效解决其可靠性问题。为更高效利用太赫兹通信的宽带无线资源,提出一种可变速率HARQ增量冗余(Incremental Redundancy,IR)技术HARQ-IR来辅助太赫兹通信并分析其通信的可靠性。由于中断概率是表征可靠性的关键性能指标,通过梅林变换以及特殊函数理论等推导了可变速率HARQ-IR辅助太赫兹通信的中断概率的闭合表达式。该表达式极其复杂且不利于挖掘其物理内涵,因此研究了高信噪比条件下中断概率的渐近表达式。利用复变函数理论推导了其闭合表达式,基于此理论证明可变速率HARQ-IR辅助太赫兹通信可以获得全分集增益,并且分集阶数与路径衰落以及指向误差相关。此外,调制和编码增益与可变速率的取值次序无关。通过大量数值仿真验证说明了理论分析的正确性。 展开更多
关键词 太赫兹通信 混合自动重传请求增量冗余 可靠性 α-μ衰落信道
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Cognitive amplify-and-forward dual-hop relay networks over α-μ fading channels 认领 引用 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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