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.

翻译：本文调查了在与时相关的中日消退管道(HARQ)混合自动重复请求(HARQ)计划在与时相关的中日消退通道(HARQ)中的权力分配问题。时间关系的存在使得由于多个相关消退通道的参与而使权力分配问题复杂化。在一个与时相关的中日消退通道中,由于指数性的相关性,我们拟议的权力分配计划与固定的电力分配相比可以节省大量电力。此外,在实际的低耗竭制约下,当时间关系减少和(或)淡化秩序增加时,电力效率会进一步提高。