低轨道卫星快速波束跳变的实时数字预失真

IF 4.4 3区计算机科学 Q2 TELECOMMUNICATIONS

IEEE Communications Letters Pub Date : 2025-04-28 DOI:10.1109/LCOMM.2025.3564580

Yaohua Deng;Zhongliang Deng;Ke Wang;Wenliang Lin;Yiyuan Wei

{"title":"低轨道卫星快速波束跳变的实时数字预失真","authors":"Yaohua Deng;Zhongliang Deng;Ke Wang;Wenliang Lin;Yiyuan Wei","doi":"10.1109/LCOMM.2025.3564580","DOIUrl":null,"url":null,"abstract":"Fully-connected (FC) hybrid beamforming (HBF) has become crucial in low Earth orbit (LEO) satellite communications. However, severe power amplifier (PA) nonlinearities arise due to high power demands. Traditional digital predistortion (DPD) techniques encounter substantial challenges within LEO environments. The constrained computational resources and codebook storage, limited RF feedback, and outdated channel state information (CSI) collectively hinder real-time DPD implementation in millisecond-scale beam hopping. To address these issues, this letter proposes a multi-element spatial DPD framework incorporating a power selection module and single-channel feedback. By storing predistorters in codebooks indexed only by power levels and enabling real-time updates at different power levels, the proposed scheme effectively decouples DPD from beam hopping, achieving robust and low-complexity nonlinear compensation in LEO satellite systems.","PeriodicalId":13197,"journal":{"name":"IEEE Communications Letters","volume":"29 6","pages":"1426-1430"},"PeriodicalIF":4.4000,"publicationDate":"2025-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Real-Time Digital Predistortion for Rapid Beam Hopping in LEO Satellites\",\"authors\":\"Yaohua Deng;Zhongliang Deng;Ke Wang;Wenliang Lin;Yiyuan Wei\",\"doi\":\"10.1109/LCOMM.2025.3564580\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"Fully-connected (FC) hybrid beamforming (HBF) has become crucial in low Earth orbit (LEO) satellite communications. However, severe power amplifier (PA) nonlinearities arise due to high power demands. Traditional digital predistortion (DPD) techniques encounter substantial challenges within LEO environments. The constrained computational resources and codebook storage, limited RF feedback, and outdated channel state information (CSI) collectively hinder real-time DPD implementation in millisecond-scale beam hopping. To address these issues, this letter proposes a multi-element spatial DPD framework incorporating a power selection module and single-channel feedback. By storing predistorters in codebooks indexed only by power levels and enabling real-time updates at different power levels, the proposed scheme effectively decouples DPD from beam hopping, achieving robust and low-complexity nonlinear compensation in LEO satellite systems.\",\"PeriodicalId\":13197,\"journal\":{\"name\":\"IEEE Communications Letters\",\"volume\":\"29 6\",\"pages\":\"1426-1430\"},\"PeriodicalIF\":4.4000,\"publicationDate\":\"2025-04-28\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"IEEE Communications Letters\",\"FirstCategoryId\":\"94\",\"ListUrlMain\":\"https://ieeexplore.ieee.org/document/10978043/\",\"RegionNum\":3,\"RegionCategory\":\"计算机科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"TELECOMMUNICATIONS\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"IEEE Communications Letters","FirstCategoryId":"94","ListUrlMain":"https://ieeexplore.ieee.org/document/10978043/","RegionNum":3,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"TELECOMMUNICATIONS","Score":null,"Total":0}

引用次数: 0

摘要

全连接（FC）混合波束形成（HBF）技术已成为低地球轨道卫星通信的关键技术。然而，由于高功率需求，功率放大器（PA）出现了严重的非线性。传统的数字预失真（DPD）技术在低轨道环境中面临着巨大的挑战。有限的计算资源和码本存储、有限的射频反馈和过时的信道状态信息（CSI）共同阻碍了毫秒级波束跳频的实时DPD实现。为了解决这些问题，本文提出了一个包含功率选择模块和单通道反馈的多元素空间DPD框架。该方案通过将预失真器存储在仅按功率级索引的码本中，并实现不同功率级的实时更新，有效地解耦了DPD和波束跳变的影响，实现了低轨道卫星系统中鲁棒、低复杂度的非线性补偿。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

查看原文本刊更多论文

Real-Time Digital Predistortion for Rapid Beam Hopping in LEO Satellites

Fully-connected (FC) hybrid beamforming (HBF) has become crucial in low Earth orbit (LEO) satellite communications. However, severe power amplifier (PA) nonlinearities arise due to high power demands. Traditional digital predistortion (DPD) techniques encounter substantial challenges within LEO environments. The constrained computational resources and codebook storage, limited RF feedback, and outdated channel state information (CSI) collectively hinder real-time DPD implementation in millisecond-scale beam hopping. To address these issues, this letter proposes a multi-element spatial DPD framework incorporating a power selection module and single-channel feedback. By storing predistorters in codebooks indexed only by power levels and enabling real-time updates at different power levels, the proposed scheme effectively decouples DPD from beam hopping, achieving robust and low-complexity nonlinear compensation in LEO satellite systems.

求助全文

通过发布文献求助，成功后即可免费获取论文全文。去求助

来源期刊

IEEE Communications Letters 工程技术-电信学

CiteScore

8.10

自引率

7.30%

发文量

590

审稿时长

2.8 months

期刊介绍： The IEEE Communications Letters publishes short papers in a rapid publication cycle on advances in the state-of-the-art of communication over different media and channels including wire, underground, waveguide, optical fiber, and storage channels. Both theoretical contributions (including new techniques, concepts, and analyses) and practical contributions (including system experiments and prototypes, and new applications) are encouraged. This journal focuses on the physical layer and the link layer of communication systems.