强激光与粒子束2025，Vol.37Issue(12)：11-18,8.DOI:10.11884/HPLPB202537.250149
基于SDR的LFM信号对QPSK通信系统干扰效应实验研究
Investigation on interference effects of LFM signals on QPSK communication systems based on SDR
摘要
Abstract
[Background]The high peak power and wide spectral characteristics of high-power radar may cause unintended interference to communication systems operating in adjacent frequency bands.[Purpose]This study aims to clarify the effects of key LFM waveform parameters on interference mechanisms and to describe their governing patterns.[Methods]A closed-loop injection platform based on software-defined radio(SDR)was developed to inject synthesized LFM waveforms into a QPSK receiver.Error vector magnitude(EVM)serves as the performance metric,while pulse width,pulse period,and chirp bandwidth are varied systematically under fixed duty-cycle constraints.[Results]Results indicate that increasing the duty cycle significantly raises the EVM value,although its growth moderates beyond a 30%duty cycle.Under constant duty cycles,pulse-period variations show negligible influence on EVM.As chirp bandwidth increases from 1 MHz to 3 MHz,the EVM decreases from-10.5 dB to-19.8 dB,a reduction of 9.3 dB,but remains nearly constant with further bandwidth expansion to 10 MHz.[Conclusions]These findings offer critical insights into radar-communication spectrum coexistence and anti-interference system design,while confirming the effectiveness of SDR-based platforms for investigating high-power microwave(HPM)interference effects.关键词
通信干扰/软件定义无线电/误差矢量幅度/线性调频信号/正交相移键控Key words
communication interference/software defined radio/error vector magnitude/linear frequency modulated signal/quadrature phase shift keying分类
电子信息工程引用本文复制引用
黄嘉伟,张明文,刘昆仑,马春光..基于SDR的LFM信号对QPSK通信系统干扰效应实验研究[J].强激光与粒子束,2025,37(12):11-18,8.基金项目
四川省科技计划项目(2024ZYD0153) （2024ZYD0153）
