5G毫米波硬件损伤对波形的影响及补偿方法  

Influence of 5G millimeter wave hardware impairments on waveforms and compensation methods

作　　者：申敏[1,2] 王哲 SHEN Min;WANG Zhe(School of Communication and Information Engineering,Chongqing University of Posts and Telecommunications,Chongqing 400065,P.R.China;Key Lab of New Generation Broadband Mobile Communication Technology,Chongqing University of Posts and Telecommunications,Chongqing 400065,P.R.China)

机构地区：[1]重庆邮电大学通信与信息工程学院,重庆400065 [2]重庆邮电大学新一代宽带移动通信重点实验室,重庆400065

出　　处：《重庆邮电大学学报（自然科学版）》2020年第4期544-553,共10页Journal of Chongqing University of Posts and Telecommunications(Natural Science Edition)

基　　金：国家科技重大专项基金(2018ZX03001026-002)。

摘　　要：毫米波通信是5G的关键技术之一,由于频率高、硬件制造难,导致毫米波射频硬件存在严重损伤。毫米波射频硬件损伤主要包括功率放大器非线性、相位噪声、I/Q不平衡、采样抖动、采样频率偏移、载波频率偏移、天线损伤等。主要研究功率放大器非线性、相位噪声以及I/Q不平衡3种射频硬件损伤模型以及对正交频分复用(orthogonal frequency division multiplexing,OFDM),通用滤波多载波(universal filtered multi-carrier,UFMC),滤波正交频分复用(filtered orthogonal frequency division multiplexing,F-OFDM)和加权叠加正交频分复用(cycle prefix orthogonal frequency division multiplexing with weighted overlap and add,WOLA)波形的影响,分别提出射频硬件损伤的补偿方法。利用迭代消除算法消除功率放大器非线性损伤,采用5G标准中定义的相位追踪参考信号对相位噪声进行补偿,采用最小均方(least mean square,LMS)算法估计I/Q不平衡因子并进行补偿。仿真结果表明,F-OFDM抵抗毫米波射频硬件损伤的能力优于其他3种波形,OFDM和UFMC的性能相近,WOLA的性能最差。Millimeter wave communication is one of the key technologies of 5G system.Due to its high frequency and difficult hardware manufacturing,the millimeter wave RF hardware has serious impairments.The impairments mainly includes power amplifier nonlinearity,phase noise,I/Q imbalance,sampling jitter,sampling frequency offset,carrier frequency offset,antenna impairments and so on.This paper studies three kinds of RF hardware impairment models of power amplifier nonlinearity,phase noise and I/Q imbalance and their effects on orthogonal frequency division multiplexing(OFDM),universal filtered multi-carrier(UFMC),filtered orthogonal frequency division multiplexing(F-OFDM)and cycle prefix orthogonal frequency division multiplexing with weighted overlap and add(WOLA),and proposes compensation methods for RF hardware impairments.The iterative elimination algorithm is used to remove the nonlinear impairment.The phase tracking reference signal defined in the 5G standard is used to compensate phase noise.The least mean square(LMS)algorithm is used to estimate the I/Q imbalance factor and compensate.The simulation results show that the ability of F-OFDM to resist millimeter wave RF hardware impairments is better than the other waveforms,and OFDM and UFMC have a similar performance,and WOLA has the worst performance.

关 键 词：毫米波通信 波形 功率放大器非线性 相位噪声 I/Q不平衡 相位追踪参考信号 

分 类 号：TN915[电子电信—通信与信息系统]