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arXiv 2209.14768cs.ITmath.IT
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时相关Nakagami-m衰落信道下HARQ方案的最优功率分配

Optimal Power Allocation for HARQ Schemes over Time-Correlated Nakagami-m Fading Channels

Zheng Shi, Shaodan Ma, Fen Hou, Kam-Weng Tam, Yik-Chung Wu

摘要:

研究了中断约束下时间相关Nakagami-m衰落信道下混合自动重传请求(HARQ)系统的功率分配问题。时间相关性的存在复杂的功率分配问题,由于涉及多个相关的衰落信道。在具有指数相关性的Nakagami-m衰落信道下,首先推导了三种广泛采用的HARQ方案的中断概率,包括Type I HARQ、HARQ with Chase Combining(HARQ-CC)和HARQ with Incremental Redundancy(HARQ-IR)。基于这些结果,提出了在保证中断性能的前提下,最小化平均总传输功率的功率分配方案。仿真结果表明,我们的中断分析的准确性和我们提出的功率分配方案的有效性。结果表明,我们提出的功率分配方案可以实现显着的功率节省相比,固定的功率分配。此外,在实际的低中断约束下,当时间相关性降低和/或衰落阶数增加时,功率效率进一步提高。

英文摘要:

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.

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