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弹箭与制导学报 >

2023 , Vol. 43 >Issue 2: 32 - 37

DOI: https://doi.org/10.15892/j.cnki.djzdxb.2023.02.006

基于速率匹配的FSO与RF间链路的动态切换算法

  • 李春若 1 ,
  • 苑俊英 2
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  • 1 江西财经职业学院信息中心,江西 南昌 331700
  • 2 广州南方学院电气与计算机工程学院,广东 广州 510970
苑俊英(1980—),女,副教授,硕士,研究方向:数据挖掘、无线传感器网络、图像处理。

李春若(1978—),男,副教授,硕士,研究方向:计算机软件理论。

收稿日期: 2022-07-01

  网络出版日期: 2025-02-24

基金资助

广东省重点平台及科研项目(2019KTSCX228)

2019年广州市科学研究计划项目(201904010276)

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Rate Adaptation-based Free Space Optical/RF Dynamic Switching Algorithm

  • LI Chunruo 1 ,
  • YUAN Junying 2
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  • 1 Nanchang Campus Information Center of Jiangxi Vocational College of Finance and Economics,Nanchang 331700, Jiangxi, China
  • 2 School of Electrical and Computer Engineering, Nanfang College Guangzhou,Guangzhou 510970, Guangdong, China

Received date: 2022-07-01

  Online published: 2025-02-24

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摘要

位于平流层的高空平台向上连接卫星、向下连接低空无人机,能够有效支撑空天地一体化信息网络,提供灵活的应急通信。然而,针对高空平台至无人机的下行链路,传统算法采用固定速率,降低链路的平均传输速率,增加了链路的中断概率。为此,提出基于速率匹配的自由空间光通信(free space optical, FSO)和射频(radio frequency, RF)链路的动态切换算法(rate adaptation-based free space optical and RF dynamic switching, RADS)。RADS算法优先使用FSO链路,若FSO链路的瞬时信噪比低于阈值,就切入RF链路。同时,根据所接收信号的信噪比,采用满足最低误码率要求的传输模式,进而满足速率要求。仿真结果表明,相比于传统的固定速率算法,提出的RADS算法降低了链路中断概率,提升了速率。

关键词： 高空平台; 无人机; 自由空间光通信; 瞬时信噪比; 速率匹配

本文引用格式

李春若 , 苑俊英 . 基于速率匹配的FSO与RF间链路的动态切换算法[J]. 弹箭与制导学报, 2023 , 43(2) : 32 -37 . DOI: 10.15892/j.cnki.djzdxb.2023.02.006

Abstract

The high-altitude platform (HAP), located in the stratosphere, connects with satellites upward and low-altitude unmanned aerial vehicle, it can effectively support space-air-ground integrated information networks, and provides flexible emergency communications. However, for the downlink form HAP to unmanned aerial vehicle (UAV), the traditional algorithm tends to be fixed rate, which reduces average transmission rate and improve the outage probability. Rate adaptation-based free space optical and RF dynamic switching (RADS) algorithm is proposed in this paper. In RADS algorithm, FSO link is considered as a primary link, while the RF link is used as backup when the quality of FSO link becomes unacceptable. In addition, according to the signal-to-noise ratio of received signal, the transmission mode meeting the requirements of the minimum bit error rate is adopted to meet the rate requirements. The results show that RADS algorithm outperform than traditional algorithm in terms of outage probability and data rate.

Key words： high-altitude platform; unmanned aerial vehicle; free space optical; signal noise ratio; rate adaptation

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