论文标题
I型HAR的中断分析与随时间相关的瑞利褪色通道
Outage Analysis on Type I HARQ over Time-Correlated Rayleigh Fading Channels
论文作者
论文摘要
本文分析了I型混合动力自动重复请求（HARQ），这是与时间相关的瑞利褪色通道。由于存在通道时间相关性，分析比文献中的先前分析更具挑战性。首先将中断概率作为基于无限串联表示的多个独立γ随机变量的关节CDF的加权总和。提出了一种截断方法，以有效地计算中断概率，并证明截断误差随截断顺序呈指数下降。然后以简单的形式得出渐近中断的概率，可以清楚地将数据包传输速率，发射功率和通道时间相关的影响清楚地分解和分析。基于渐近中断概率，还分析了HARQ的多样性顺序。发现即使在时间相关的褪色通道和通道的时间相关性下，也可以实现完全的多样性，对高信噪比（SNR）下的停电概率也具有负面影响。最后，我们的分析结果通过蒙特卡洛模拟验证。
This paper analyzes Type I hybrid automatic repeat request (HARQ) over time-correlated Rayleigh fading channels. Due to the presence of channel time correlation, the analysis is more challenging than the prior analysis in the literature. Outage probability is first derived as a weighted sum of joint CDF of multiple independent Gamma random variables based on an infinite series representation. A truncation method is proposed for efficient computation of the outage probability and it is proved that the truncation error decreases exponentially with the truncation order. Asymptotic outage probability is then derived in a simple form, with which the impacts of packet transmission rate, transmit power and channel time correlation could be decoupled and analyzed clearly. Based on the asymptotic outage probability, diversity order of HARQ is also analyzed. It is found that full diversity can be achieved even under time correlated fading channels and the time correlation of the channels has negative effect on the outage probability under high signal-to-noise ratio (SNR). Finally, our analytical results are validated by MonteCarlo simulations.
