摘要
为消除射频脉宽调制(Radio Frequency Pulse Width Modulation,RF-PWM)的特定谐波,本文提出了一种适用于全数字发信机(All-Digital Transmitters,ADTx)的多电平RF-PWM方法.该方法利用多个自适应门限与相位调制信号实时比较,控制多个子脉冲的脉冲宽度,在基波分量加权之和正比于输入信号包络的前提下,使其特定谐波分量相互抵消.和现有技术相比,该方法可显著降低ADTx的输出滤波要求,提高其宽频段性能.以3次谐波消除为例,本文给出了对应5电平RF-PWM方案,并利用仿真和离线实验证明了该方案的有效性.
To eliminate the selective harmonics of radio frequency pulse width modulation(RF-PWM) signals,a novel multi-level RF-PWM method for all-digital transmitters(ADTx) is proposed.This method compares the adaptive thresholds in real-time with the phase modulated signal,and controls the pulsewidth of the corresponding subpulses to make the selected harmonics cancel each other out and keep the weighted superposition of fundamental frequency components proportional to input envelope.Compared with the existing techniques,the proposed method can significantly relax the filtering requirements and improve the wideband performance of the ADTx.For the third harmonic elimination,the corresponding 5-level RF-PWM scheme is presented in this paper.Finally,the proposed scheme is verified by extensive simulations and offline measurements.
作者
周强
姚富强
魏志虎
朱蕾
陈剑斌
ZHOU Qiang;YAO Fu-qiang;WEI Zhi-hu;ZHU Lei;CHEN Jian-bin(The Sixty-third Research Institute,National University of Defense Technolog,Nanjing,Jiangsu 210007,China)
出处
《电子学报》
EI
CAS
CSCD
北大核心
2019年第3期591-599,共9页
Acta Electronica Sinica
基金
国家自然科学基金重点项目(No.61631021)
关键词
全数字发信机
脉冲宽度调制
多电平
自适应门限
特定谐波抑制
all-digital transmitter
pulse-width modulation
multi-level
adaptive thresholding
selective harmonic elimination
