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

Huang Jiawei; Zhang Mingwen; Liu Kunlun; Ma Chunguang

doi:10.11884/HPLPB202537.250149

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Huang Jiawei, Zhang Mingwen, Liu Kunlun, et al. Investigation on interference effects of LFM signals on QPSK communication systems based on SDR[J]. High Power Laser and Particle Beams. doi: 10.11884/HPLPB202537.250149

Citation:

Huang Jiawei, Zhang Mingwen, Liu Kunlun, et al. Investigation on interference effects of LFM signals on QPSK communication systems based on SDR[J]. High Power Laser and Particle Beams. doi: 10.11884/HPLPB202537.250149

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

doi: 10.11884/HPLPB202537.250149

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

Received Date: 2025-05-22
Accepted Date: 2025-08-12
Rev Recd Date: 2022-08-26

Available Online: 2025-09-11

Abstract

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

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References(25)

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