频相失配下跳频保密通信性能分析与功率优化

doi:10.11959/j.issn.1000-436x.2022169

通信学报 ›› 2022, Vol. 43 ›› Issue (9): 42-56.doi: 10.11959/j.issn.1000-436x.2022169

频相失配下跳频保密通信性能分析与功率优化

宋长庆¹^,², 赵宏志¹^,², 秦俪之¹^,², 邵士海¹^,²

¹ 电子科技大学通信抗干扰技术国家级重点实验室，四川成都 611731
² 电磁空间认知与智能控制技术实验室，北京 100089

修回日期:2022-08-26 出版日期:2022-09-25 发布日期:2022-09-01
作者简介:宋长庆（1996- ），男，江苏徐州人，电子科技大学博士生，主要研究方向为无线通信信号处理、抗干扰与安全通信、同时同频全双工技术等
赵宏志（1978- ），男，河北石家庄人，博士，电子科技大学教授、博士生导师，主要研究方向为无线通信信号处理、通信抗干扰技术、同时同频全双工技术、并行化通信信号处理等
秦俪之（1999- ），女，重庆人，电子科技大学硕士生，主要研究方向为自干扰抑制、抗干扰与安全通信、无线通信信号处理等
邵士海（1980- ），男，辽宁抚顺人，博士，电子科技大学教授、博士生导师，主要研究方向为无线通信信号处理、机器学习与人工智能、抗干扰与安全通信等
基金资助:
国家自然科学基金资助项目(U19B2014);国家自然科学基金资助项目(62071094);国家自然科学基金资助项目(61901396)

Performance analysis and power optimization for FH secure communication under frequency and phase mismatch

Changqing SONG¹^,², Hongzhi ZHAO¹^,², Lizhi QIN¹^,², Shihai SHAO¹^,²

¹ National Key Lab of Science and Technology on Communications, University of Electronic Science and Technology of China, Chengdu 611731, China
² Laboratory of Electromagnetic Space Cognition and Intelligent Control, Beijing 100089, China

Revised:2022-08-26 Online:2022-09-25 Published:2022-09-01
Supported by:
The National Natural Science Foundation of China(U19B2014);The National Natural Science Foundation of China(62071094);The National Natural Science Foundation of China(61901396)

摘要/Abstract

摘要：

人工噪声掩护的跳频保密通信可以有效对抗电磁干扰与非法窃听、提供强保密通信，但其载波频率在宽带范围内持续、快速跳变，收发信机间存在严重的载波频率偏移与相位噪声，导致合法接收机处人工噪声无法被完美抑制。鉴于此，首先对收发频率、相位失配下跳频收发信号进行数学建模；然后采用信噪比指标衡量频相失配下人工噪声抑制性能，并采用保密容量指标衡量系统保密性能；最后提出具有频相失配稳健性的发射功率分配方案，并根据不同的频相匹配度与传播信道质量对所提方案进行拓展。数值仿真结果表明，收发频率偏移与相位噪声会显著降低接收机处人工噪声抑制能力与系统保密性能。随着频相失配问题的恶化，应逐步降低人工噪声与保密信号的发射功率比例以降低由频相失配引起的系统性能损失。

关键词: 跳频, 频相失配, 人工噪声抑制, 保密容量, 功率分配

Abstract:

The artificial noise (AN) shielded frequency hopping (FH) secure communication can counteract electromagnetic interference and wiretapping, but its carrier frequencies change rapidly within a wide bandwidth which will raise the level of carrier frequency offset and phase noise, yielding AN cancellation performance degradation.To tackle this, the signal distortion caused by frequency and phase mismatch (FPM) was mathematically modeled, the AN cancellation performance was evaluated via signal-to-noise ratio, and the system secrecy was scaled via secrecy capacity.On basis of this, the optimal power allocation scheme for AN and confidential signal was designed, and the scheme was expanded according to the FPM level and the propagation channel quality.Numerical simulations verify that FPM can significantly degrade the noise cancellation performance and system secrecy, and to counteract this, the power ratio of AN to confidential signals should decrease with an increasing FPM.

Key words: frequency hopping, frequency and phase mismatch, artificial noise cancellation, secrecy capacity, power allocation

中图分类号:

TN975

宋长庆, 赵宏志, 秦俪之, 邵士海. 频相失配下跳频保密通信性能分析与功率优化[J]. 通信学报, 2022, 43(9): 42-56.

Changqing SONG, Hongzhi ZHAO, Lizhi QIN, Shihai SHAO. Performance analysis and power optimization for FH secure communication under frequency and phase mismatch[J]. Journal on Communications, 2022, 43(9): 42-56.

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参数	取值	参数	取值
保密信号类型	二进制相移键控^[22]	每跳符号数	1～10 ⁸
人工噪声类型	零均值高斯信号^[22]	射频中心频率/GHz	1
基带信号带宽/kHz	45	主信道质量	1～10 ²⁰
跳频带宽/MHz	50	窃听信道质量	1～10 ⁶
跳频图案周期/跳	1 500	归一化频率偏移	10^-6～10⁰ [23]
采样周期/ns	2	归一化3 dB相干带宽	10¹⁰-10⁰ [21]

频相失配下跳频保密通信性能分析与功率优化

Performance analysis and power optimization for FH secure communication under frequency and phase mismatch

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