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通过功率分配实现具有IR - HARQ的可靠且节能的低地球轨道卫星通信

Reliable and Energy-Efficient LEO Satellite Communication with IR-HARQ via Power Allocation.

作者信息

Bian Hongxiu, Liu Rongke

机构信息

School of Electronic and Information Engineering, Beihang University, Beijing 100191, China.

Shenzhen Institution of Beihang University, Shenzhen 518038, China.

出版信息

Sensors (Basel). 2022 Apr 15;22(8):3035. doi: 10.3390/s22083035.

DOI:10.3390/s22083035
PMID:35459020
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9032650/
Abstract

This paper examines reliable and energy-efficient transmission in low earth orbit (LEO) satellite communication systems. In particular, we analyze the link transmission characteristics of the LEO satellite to the ground user and model the channel as a combination of large-scale fading and small-scale fading. Based on this, we consider an incremental redundancy hybrid automatic repeat request (IR-HARQ) technique with a variable-power allocation method, and we call it the IR-HARQ-VPA scheme. In this method, the outage probability after each IR-HARQ round can be obtained through numerical integration based on the fast Fourier transform (NI-FFT). This method is suitable for any number of HARQ transmission rounds and can improve the accuracy compared with previous approximation methods. In addition, variable-power allocation based on the genetic algorithm (VPA-GA) is introduced to reduce the energy consumption. The simulation results show that the proposed IR-HARQ-VPA scheme cannot only meet the requirements of transmission reliability but also achieves higher energy efficiency than IR-HARQ with equal power (IR-HARQ-EP) transmission and a previously proposed variable-power allocation method. Moreover, the simulation results in a LEO satellite communication window also confirm the effectiveness of the proposed IR-HARQ-VPA scheme.

摘要

本文研究了低地球轨道（LEO）卫星通信系统中的可靠且节能的传输。具体而言，我们分析了LEO卫星与地面用户之间的链路传输特性，并将信道建模为大尺度衰落和小尺度衰落的组合。基于此，我们考虑一种采用可变功率分配方法的增量冗余混合自动重传请求（IR-HARQ）技术，我们将其称为IR-HARQ-VPA方案。在该方法中，每轮IR-HARQ之后的中断概率可以通过基于快速傅里叶变换的数值积分（NI-FFT）获得。此方法适用于任意数量的HARQ传输轮次，并且与先前的近似方法相比可以提高精度。此外，引入了基于遗传算法的可变功率分配（VPA-GA）以降低能耗。仿真结果表明，所提出的IR-HARQ-VPA方案不仅能够满足传输可靠性要求，而且与等功率IR-HARQ（IR-HARQ-EP）传输及先前提出的可变功率分配方法相比，实现了更高的能量效率。此外，在LEO卫星通信窗口中的仿真结果也证实了所提出的IR-HARQ-VPA方案的有效性。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c5ec/9032650/99ef70d053d6/sensors-22-03035-g014.jpg
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