基于SDR的LFM信号对QPSK通信系统干扰效应实验研究

黄嘉伟; 张明文; 刘昆仑; 马春光

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

doi: 10.11884/HPLPB202537.250149

1.
电子科技大学电子科学与工程学院，成都 611731
2.
驻广元地区军代室，四川广元 628000

基金项目: 四川省科技计划项目(2024ZYD0153)

详细信息

作者简介:
黄嘉伟，jiawei2000303@163.com

通讯作者:
马春光，macg@uestc.edu.cn。

中图分类号: TN972
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- 文章访问数: 21
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- 被引次数: 0
出版历程
- 收稿日期: 2025-05-22
- 修回日期: 2022-08-26
- 录用日期: 2025-08-12
- 网络出版日期: 2025-09-11

Investigation on interference effects of LFM signals on QPSK communication systems based on SDR

1.
School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China
2.
Military Representative Office in Guangyuan Area, Guangyuan 628000, China

摘要

摘要: 高功率雷达广泛应用于国防、监视和航空航天等重要领域，但其较高的峰值功率和宽频谱特性可能对邻近频段的通信系统造成非预期的干扰。其中，线性调频（LFM）信号是高功率雷达最常用的信号形式，因此开展LFM信号对通信系统的干扰特性研究具有重要意义。为明确LFM信号关键波形参数对正交相移键控（QPSK）调制通信系统的干扰效应并揭示其干扰规律，基于软件定义无线电（SDR）搭建QPSK调制通信系统，以误差矢量幅度（EVM）为统一度量指标，定量分析了脉宽、脉冲周期和调频带宽三个关键波形参数对QPSK调制通信系统的干扰影响。结果表明：线性调频脉冲的占空比增大会显著提高EVM值，但当占空比超过30%后，EVM增速趋于稳定；在相同占空比条件下，脉冲周期变化对通信系统EVM的影响不显著；调频带宽从1 MHz增至3 MHz时，通信系统的EVM由−10.5 dB降至−19.8 dB，降幅达9.3 dB；进一步将带宽由3 MHz增加至10 MHz，EVM基本保持恒定。本文基于SDR平台搭建了高功率微波（HPM）雷达信号对通信系统干扰的定量分析实验系统，开展了多波形参数条件下的干扰测试与分析，揭示了LFM信号对QPSK调制通信系统的潜在影响，为雷达与通信频谱共存及通信系统抗干扰设计提供了实验依据与理论支撑。
- 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
Abstract: Background
Unintended spectral leakage from high-power linear frequency-modulated (LFM) radar can seriously degrade adjacent QPSK communication links.
Purpose
To clarify the effects of key LFM waveform parameters on interference mechanisms and to describe their governing patterns,
Methods
this study develops a closed-loop injection platform based on software-defined radio (SDR) 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.
- software defined radio /
- communication interference /
- linear frequency modulated signal /
- quadrature phase shift keying /
- error vector magnitude

HTML全文

图 1 通信系统电磁干扰场景示意图

Figure 1. Illustration of interference scenario in communication system

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图 2 频谱重叠示意图

Figure 2. Schematic diagram of spectral overlap

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图 3 误差矢量幅度示意图

Figure 3. Illustration of Error Vector Magnitude (EVM)

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图 4 实验框图及实验现场照片

Figure 4. Block diagram and photograph of the experimental setup

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图 5 基于Matlab Simulink软件的信号发射和接收模块设计

Figure 5. Design of signal transmission and reception modules based on MATLAB/Simulink

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图 6 EVM随占空比变化测试结果

Figure 6. Test results of EVM variation with duty cycle

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图 7 相同占空比下不同脉冲周期（100 µs与1000 µs）干扰下通信信号接收频谱图

Figure 7. Received spectra of communication signals under interference with same duty cycle and different periods (100 µs and 1000 µs)

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图 8 占空比30%条件下EVM测试星座图

Figure 8. Constellation diagrams of EVM measurement under 30% duty cycle

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图 9 EVM随调频带宽变化测试结果

Figure 9. Test results of EVM variation with modulation bandwidth

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