基于空间参考信号的数字干扰对消系统性能分析

信业镝; 何方敏; 葛松虎; 邢金岭; 郭宇; 崔中普

doi:10.11999/JEIT250679

基于空间参考信号的数字干扰对消系统性能分析

doi: 10.11999/JEIT250679 cstr: 32379.14.JEIT250679

海军工程大学电磁能技术全国重点实验室武汉 430033

基金项目: 国家自然科学基金(62301588, 62241111)，电磁能技术全国重点实验室基金项目(61422172320303)

详细信息

作者简介:
信业镝：男，博士生，研究方向为通信抗干扰

何方敏：男，研究员，研究方向为电磁兼容、干扰对消、信号处理

葛松虎：男，副研究员，研究方向为通信信号处理、电磁兼容

邢金岭：男，副研究员，研究方向为通信信号处理、电磁兼容

郭宇：男，副教授，研究方向为人工智能

崔中普：男，助理研究员，研究方向为干扰对消、数字信号处理

通讯作者:
葛松虎　gesonghu23@nue.edu.cn

中图分类号: TN975
计量
- 文章访问数: 35
- HTML全文浏览量: 15
- PDF下载量: 5
- 被引次数: 0
出版历程
- 收稿日期: 2025-07-21
- 修回日期: 2025-11-03
- 录用日期: 2025-11-03
- 网络出版日期: 2025-11-11

Performance Analysis of Spatial-Reference-Signal-Based Digital Interference Cancellation Systems

National Key Laboratory of Electromagnetic Energy, Naval University of Engineering, Wuhan 430033, China

Funds: The National Nature Science Foundation of China (62301588, 62241111), The National Key Laboratory Foundation of Electromagnetic Energy (61422172320303)

摘要

摘要: 为了解决基于耦合器的传统参考信号取样方式在大功率射频系统部署难题，该文提出了一种采用定向天线和接收链路的数字干扰对消系统。针对该系统，基于干扰信号矩形带限频谱特征的假设，分别推导了接收信道和取样信道在多径环境下干扰对消比性能闭式表达式。此外，进一步给出了对消比性能上限表达式。最后，利用蒙特卡罗仿真验证了3种典型调制方式下推导结果的准确性，并分析了系统参数对于对消比的性能影响。结果表明，基于空间参考信号的数字干扰对消系统对消比性能受接收通道干噪比、取样通道干噪比、滤波器抽头数目、多径时延扩展长度、多径数目和时延匹配误差影响。
- 数字干扰对消 /
- 空间参考信号 /
- 多径 /
- 系统参数 /
- 干扰对消比
Abstract: Objective With the rapid development of wireless communications, an increasing number of transceivers are deployed on platforms with limited spatial and spectral resources. Restrictions in frequency and spatial isolation cause high-power local transmitters to couple signals into nearby high-sensitivity receivers, causing co-site interference. Interference cancellation serves as an effective mitigation technique, whose performance depends on precise acquisition of a reference signal representing the interference waveform. Compared with digital sampling, Radio Frequency (RF) sampling enables simpler implementation. However, existing RF-based approaches are generally restricted to low-power communication systems. In high-power RF systems, RF sampling faces critical challenges, including excessive sampling power loss and high integration complexity. Therefore, developing new sampling methods and cancellation architectures suitable for high-power RF systems is of substantial theoretical and practical value. Methods To overcome the limitations of conventional high-power RF interference sampling methods based on couplers, a spatial-reference-based digital cancellation architecture is proposed. A directional sampling antenna and its associated link are positioned near the transmitter to acquire the reference signal. This configuration, however, introduces spatial noise, link noise, and possible multipath effects, which can degrade cancellation performance. A system model is developed, and closed-form expressions for the cancellation ratio under multipath conditions are derived. The validity of these expressions is verified through Monte Carlo simulations using three representative modulated signals. Furthermore, a systematic analysis is conducted to evaluate the effects of key system parameters on cancellation performance. Results and Discussions Based on the proposed spatial-reference-based digital cancellation architecture, analytical expressions for the cancellation ratio are derived and validated through extensive simulations. These expressions enable systematic evaluation of the key performance factors. For three representative modulation schemes, the cancellation ratio shows excellent consistency between theoretical predictions and simulation results under various conditions, including receiver and sampling channel Interference-to-Noise Ratios (INRs), time-delay mismatch errors, and filter tap numbers (Figs. 2–4). The established theoretical framework is further applied to analyze the effects of system parameters. Simulations quantitatively assess (1) the influence of filter tap number, multipath delay spread, and the number of multipaths on cancellation performance in multipath environments (Figs. 5–7), and (2) the upper performance bounds and contour characteristics under different INR combinations in the receiver and sampling channels (Figs. 8–9). Conclusion To reduce the high deployment complexity and substantial insertion loss associated with coupler-based RF interference sampling in high-power systems, a digital interference cancellation architecture based on spatial reference signals is proposed. Closed-form expressions and performance bounds for the cancellation ratio of rectangular band-limited interference under multipath conditions are derived. Simulation results demonstrate that the proposed expressions provide high accuracy in representative scenarios. Based on the analytical findings, the effects of key parameters are examined, including INRs in receiver and sampling channels, filter tap length, multipath delay spread, number of paths, and time-delay mismatch. The results provide practical insights that support the design and optimization of spatial reference–based digital interference cancellation systems.
- Digital interference cancellation /
- Spatial reference signal /
- Multipath /
- System parameters /
- Interference cancellation ratio

HTML全文

图 1 基于空间参考信号的数字干扰对消系统

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图 2 对消比性能与接收通道干噪比关系

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图 3 对消比性能与接收通道与取样通道时延差关系

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图 4 对消比性能与抽头数目关系

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图 5 多径环境下对消比性能与抽头数目关系

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图 6 多径环境下对消比性能与时延扩展长度关系

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图 7 多径环境下对消比性能与多径数目关系

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图 8 对消比性能上边界

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图 9 对消比性能等高线

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表 1 仿真参数设置

序号	波形	参数	取值
1	BPSK调制信号	带宽	10 MHz
		采样率	20 MSPS
		成型脉冲	根升余弦
		滚降因子	0.10
2	线性调频信号	带宽	10 MHz
		采样率	20 MSPS
		扫频斜率	1
3	多音信号	带宽	10 MHz
		采样率	20 MSPS
		频率间隔	50 KHz

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