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

Changqing SONG; Hongzhi ZHAO; Lizhi QIN; Shihai SHAO

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

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

Papers | 更新时间：2024-06-05

- Performance analysis and power optimization for FH secure communication under frequency and phase mismatch
- Journal on Communications Vol. 43, Issue 9, Pages: 42-56(2022)
- 作者机构：
  
  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
- 作者简介：
- 基金信息：
  
  The National Natural Science Foundation of China(U19B2014);The National Natural Science Foundation of China(62071094);The National Natural Science Foundation of China(61901396)
- DOI：10.11959/j.issn.1000-436x.2022169
  CLC： TN975
- Online First：2022-09，
  
  Published：25 September 2022
- 稿件说明：
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Changqing SONG, Hongzhi ZHAO, Lizhi QIN, et al. Performance analysis and power optimization for FH secure communication under frequency and phase mismatch[J]. Journal on Communications, 2022, 43(9): 42-56.
DOI：

Changqing SONG, Hongzhi ZHAO, Lizhi QIN, et al. Performance analysis and power optimization for FH secure communication under frequency and phase mismatch[J]. Journal on Communications, 2022, 43(9): 42-56. DOI： 10.11959/j.issn.1000-436x.2022169.

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。

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.

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references

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