Distortion-aware beamforming design for multi-beam satellite communications with nonlinear power amplifiers  

作　　者：Xiang XIAO Li YOU Kezhi WANG Xiqi GAO 

机构地区：[1]National Mobile Communications Research Laboratory,Southeast University,Nanjing 210096,China [2]Purple Mountain Laboratories,Nanjing 211100,China [3]Department of Computer Science,Brunel University London,London UB83PH,UK

出　　处：《Science China(Information Sciences)》2024年第6期355-365,共11页中国科学（信息科学）（英文版）

基　　金：supported by National Natural Science Foundation of China for Outstanding Young Scholars(Grant No.62322104);Prospective and Key Technologies for Industry of the Key Technologies R&D Program of Jiangsu(Grant Nos.BE2022067,BE2022067-5);Natural Science Foundation of Jiangsu Province(Grant No.BK20231415);Natural Science Foundation on Frontier Leading Technology Basic Research Project of Jiangsu(Grant No.BK20222001);Jiangsu Province Basic Research Project(Grant No.BK20192002);Fundamental Research Funds for the Central Universities(Grant Nos.2242022k60007,2242023K5003)。

摘　　要：Hardware components can cause different impairments,including power amplifier(PA)nonlinearities,which inevitably impact the system performance of satellite communications(SATCOM).In this work,we consider a multi-beam SATCOM downlink system and investigate the distortion-aware beamforming scheme with the characteristics of PA non-linearities.Notably,we aim to maximize the resource efficiency(RE),defined as the weighted sum of energy efficiency(EE)with spectral efficiency(SE),to obtain a flexible EE-SE tradeoff while accounting for the characteristics of PA distortion and the total power constraints.Given that the optimization objective is a sum of ratios and the high non-convexity involved in constraints,we propose an efficient approach that exploits the quadratic transformation,the Lagrange multiplier method,and the gradient ascent approach to handle this issue.Simulation results demonstrate the effectiveness of the distortion-aware beamforming approach in achieving the EE-SE tradeoff and exhibit a substantial RE performance gain over the conventional approach with ideal linear PAs assumed at the satellite transmitters.

关 键 词：multi-beam satellite communications nonlinear power amplifier energy and spectral efficiency tradeoff resource efficiency robust beamforming 

分 类 号：TN927.2[电子电信—通信与信息系统] TN722.75[电子电信—信息与通信工程]