论文标题
与时间相关的Nakagami-M褪色渠道，HARQ方案的最佳功率分配
Optimal Power Allocation for HARQ Schemes over Time-Correlated Nakagami-m Fading Channels
论文作者
论文摘要
本文调查了混合自动重复请求（HARQ）方案的功率分配问题，该方案是在中断约束下逐渐相关的Nakagami-M褪色通道。由于多个相关褪色通道的参与，时间相关的存在使功率分配问题变得复杂。在具有指数相关性的一般时间相关的Nakagami-M褪色通道下，首先得出了三种广泛采用的HARQ方案的中断概率，包括I型HARQ，带有Chase Combining（HARQ-CC）的HARQ和HARQ具有增量冗余（HARQ-IR）的HARQ。通过这些结果，提出了功率分配方案，以最大程度地降低平均总传输功率，并保证停机性能。仿真结果证明了我们停电分析的准确性以及我们提出的权力分配方案的有效性。结果表明，与固定功率分配相比，我们提出的权力分配方案可以实现大量的功率节省。此外，在实际的低中断限制下，当时间相关性减少和/或褪色顺序增加时，功率效率得到进一步提高。
This paper investigates the problem of power allocation for hybrid automatic repeat request (HARQ) schemes over time-correlated Nakagami-m fading channels under outage constraint. The presence of time correlation complicates the power allocation problem due to the involvement of multiple correlated fading channels. Under a general time-correlated Nakagami-m fading channel with exponential correlation, outage probabilities for three widely adopted HARQ schemes, including Type I HARQ, HARQ with chase combining (HARQ-CC) and HARQ with incremental redundancy (HARQ-IR), are first derived. With these results, power allocation schemes are proposed to minimize the average total transmission power with guaranteed outage performance. Simulation results demonstrate the accuracy of our outage analysis and the effectiveness of our proposed power allocation schemes. It is shown that our proposed power allocation schemes can achieve significant power savings when compared with fixed power allocation. Moreover, under practical low outage constraint, the power efficiency is further improved when the time correlation is reduced and/or the fading order is increased.
