基于fft的超宽带5G有限子带数字预失真技术

Dang-Kièn Germain Pham, G. Gagnon, F. Gagnon, Georges Kaddoum, C. Jabbour, P. Desgreys
{"title":"基于fft的超宽带5G有限子带数字预失真技术","authors":"Dang-Kièn Germain Pham, G. Gagnon, F. Gagnon, Georges Kaddoum, C. Jabbour, P. Desgreys","doi":"10.1109/NEWCAS.2018.8585582","DOIUrl":null,"url":null,"abstract":"Parallel subband digital predistortion (DPD) has emerged as a promising approach for linearizing power amplifiers (PA) in wireless communication systems. This solution has the advantage of relaxing the bandwidth constraints on the feedback path analog to digital converter (ADC) which digitizes the PA distorted output which may spread over several hundreds MHz in the latest generations of mobile communications. However, the subband approach still has some limitations such as signal reconstruction and subband aliasing which limits its implementation on a wide scale. In this paper, an FFT-Based DPD technique that enables to compute the predistorter without interpolating signals is presented. Thanks to the frequency domain approach, the subband signals can be combined easily to compute the fullband predistorter directly. Moreover, the proposed technique offers the possibility of selecting specific frequency bins for the computation. In particular, the subband edges can be ignored which will result in relaxed bandwidth constraints and selectivity for the subband ADCs. Simulations show that the proposed FFT based subband DPD performs as good as the conventional time domain least-square approach even while excluding up to 13% of the FFT bins at the band edges.","PeriodicalId":112526,"journal":{"name":"2018 16th IEEE International New Circuits and Systems Conference (NEWCAS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"2","resultStr":"{\"title\":\"FFT-Based Limited Subband Digital Predistortion Technique for Ultra Wideband 5G Systems\",\"authors\":\"Dang-Kièn Germain Pham, G. Gagnon, F. Gagnon, Georges Kaddoum, C. Jabbour, P. Desgreys\",\"doi\":\"10.1109/NEWCAS.2018.8585582\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"Parallel subband digital predistortion (DPD) has emerged as a promising approach for linearizing power amplifiers (PA) in wireless communication systems. This solution has the advantage of relaxing the bandwidth constraints on the feedback path analog to digital converter (ADC) which digitizes the PA distorted output which may spread over several hundreds MHz in the latest generations of mobile communications. However, the subband approach still has some limitations such as signal reconstruction and subband aliasing which limits its implementation on a wide scale. In this paper, an FFT-Based DPD technique that enables to compute the predistorter without interpolating signals is presented. Thanks to the frequency domain approach, the subband signals can be combined easily to compute the fullband predistorter directly. Moreover, the proposed technique offers the possibility of selecting specific frequency bins for the computation. In particular, the subband edges can be ignored which will result in relaxed bandwidth constraints and selectivity for the subband ADCs. Simulations show that the proposed FFT based subband DPD performs as good as the conventional time domain least-square approach even while excluding up to 13% of the FFT bins at the band edges.\",\"PeriodicalId\":112526,\"journal\":{\"name\":\"2018 16th IEEE International New Circuits and Systems Conference (NEWCAS)\",\"volume\":\"1 1\",\"pages\":\"0\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2018-06-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"2\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"2018 16th IEEE International New Circuits and Systems Conference (NEWCAS)\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.1109/NEWCAS.2018.8585582\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"2018 16th IEEE International New Circuits and Systems Conference (NEWCAS)","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/NEWCAS.2018.8585582","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 2

摘要

并行子带数字预失真(DPD)是无线通信系统中线性化功率放大器(PA)的一种很有前途的方法。该解决方案的优点是放宽了反馈路径模数转换器(ADC)的带宽限制,后者将最新一代移动通信中可能分布在数百MHz的PA失真输出进行数字化。但是,子带方法仍然存在信号重构和子带混叠等问题,限制了子带方法的广泛应用。本文提出了一种基于fft的DPD技术,该技术可以在不插值信号的情况下计算预失真器。由于频域方法,子带信号可以很容易地组合在一起,直接计算全带预失真器。此外,所提出的技术提供了选择特定频率箱进行计算的可能性。特别是,子带边缘可以忽略,这将导致放宽带宽限制和子带adc的选择性。仿真结果表明,即使在排除频带边缘高达13%的FFT样本时,所提出的基于FFT的子带DPD的性能与传统的时域最小二乘方法一样好。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
FFT-Based Limited Subband Digital Predistortion Technique for Ultra Wideband 5G Systems
Parallel subband digital predistortion (DPD) has emerged as a promising approach for linearizing power amplifiers (PA) in wireless communication systems. This solution has the advantage of relaxing the bandwidth constraints on the feedback path analog to digital converter (ADC) which digitizes the PA distorted output which may spread over several hundreds MHz in the latest generations of mobile communications. However, the subband approach still has some limitations such as signal reconstruction and subband aliasing which limits its implementation on a wide scale. In this paper, an FFT-Based DPD technique that enables to compute the predistorter without interpolating signals is presented. Thanks to the frequency domain approach, the subband signals can be combined easily to compute the fullband predistorter directly. Moreover, the proposed technique offers the possibility of selecting specific frequency bins for the computation. In particular, the subband edges can be ignored which will result in relaxed bandwidth constraints and selectivity for the subband ADCs. Simulations show that the proposed FFT based subband DPD performs as good as the conventional time domain least-square approach even while excluding up to 13% of the FFT bins at the band edges.
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
自引率
0.00%
发文量
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
copy
已复制链接
快去分享给好友吧!
我知道了
右上角分享
点击右上角分享
0
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术官方微信