协作干扰时频同步误差对安全通信性能影响

doi:10.19665/j.issn1001-2400.2022.03.001

西安电子科技大学学报 ›› 2022, Vol. 49 ›› Issue (3): 1-9.doi: 10.19665/j.issn1001-2400.2022.03.001

• 信息与通信工程 • 下一篇

协作干扰时频同步误差对安全通信性能影响

肖尚辉^1,²(),陈燕铭¹(),王梓豫¹(),郭文博¹(),邵士海¹()

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.成都工业学院电子工程学院,四川成都 610031

收稿日期:2021-11-13 修回日期:2022-03-18 出版日期:2022-06-20 发布日期:2022-07-04
通讯作者: 邵士海
作者简介:肖尚辉(1973—),男,教授,E-mail: xiaosh73@163.com|陈燕铭(1997—),女,电子科技大学硕士研究生,E-mail: evitachan1997@gmail.com|王梓豫(1999—),女,电子科技大学硕士研究生,E-mail: sandoraivy@163.com|郭文博(1994—),男,博士,E-mail: wbguo@uestc.edu.cn
基金资助:
国家自然科学基金(U19B2014);国家自然科学基金(62071094);国家自然科学基金(61901396);成都工业学院项目(2019ZR007)

Impact of cooperative jamming time-frequency synchronization errors on secure communication performance

XIAO Shanghui^1,²(),CHEN Yanming¹(),WANG Ziyu¹(),GUO Wenbo¹(),SHAO Shihai¹()

1. National Key Laboratory of Science and Technology on Communications,University of Electronic Science and Technology of China,Chengdu 611731,China
2. School of Electronic Engineering,Chengdu Technological University,Chengdu 610031,China

Received:2021-11-13 Revised:2022-03-18 Online:2022-06-20 Published:2022-07-04
Contact: Shihai SHAO

摘要/Abstract

摘要：

安全通信的前提是在授权接收机对协作干扰信号进行精准重建和对消,但因硬件和传播环境的影响,且受实际工程精度的制约,始终存在时频同步误差。因此,针对物理层安全通信中协作干扰抑制收发非完美时频同步问题,在高斯窃听信道模型下推导了存在时频同步误差的残余干扰功率,从理论上分析时频同步误差对系统性能的影响,得到了授权用户干扰抑制比、解调误码率和安全通信保密容量3个性能评价指标的闭合表达式,进而分析时频同步误差对这3个指标的影响,并对理论性能进行了计算机仿真验证。仿真结果显示,时频同步误差对系统安全性能的影响并不单一。随着时延或频偏增大,系统对协作干扰信号的抑制程度降低,授权用户干扰抑制比、保密容量降低,解调误码率增加;而在一定范围内,时频同步误差不会影响这3个指标性能。当信噪比为10 dB,归一化时延小于0.06且归一化频偏小于10^-5时,时延和频偏对系统安全通信的性能影响较小,保密容量损失小于16%。据此,分析时频同步误差对协作干扰安全指标产生的影响,可以为设计安全通信系统提供指导和理论支持。

关键词: 协作干扰抑制, 时频同步误差, 干扰抑制比, 误码率, 保密容量

Abstract:

The premise of secure communication is to accurately reconstruct and cancel cooperative interference signals in authorized receivers.However,due to the influence of hardware and propagation environment,and restricted by actual engineering accuracy,a time-frequency synchronization error always exists.Therefore,aiming at the problem of imperfect time-frequency synchronization of the cooperative interference transceiver in physical layer secure communication,the residual interference power with a time-frequency synchronization error is derived under the Gaussian eavesdropping channel model.The influence of the time-frequency synchronization error on the system performance is analyzed theoretically,and the closed expressions for the authorized user interference suppression ratio,demodulation bit error rate and secure communication security capacity are obtained,while the theoretical performance is verified by computer simulation.Simulation results show that the suppression degree of the cooperative interference signal decreases,that the interference suppression ratio and security capacity of authorized users decrease,and that the demodulation bit error rate increases with the increase of time delay or frequency offset.In a certain range,the time-frequency synchronization error will not affect the performance of the three indicators.When the signal-to-noise ratio is 10 dB,it is shown that the normalized delay is less than 0.06,that the normalized frequency offset is less than 10^-5,that the delay and frequency offset have a little impact on the system security communication performance,and that the loss of security capacity is less than 16%.Accordingly,analyzing the influence of the time-frequency synchronization error of cooperative interference can provide guidance and theoretical support for the design of a secure communication system.

Key words: cooperative jamming cancellation, time-frequency synchronization errors, jamming cancellation ratio, bit error rate, secrecy capacity

中图分类号:

TN92

肖尚辉,陈燕铭,王梓豫,郭文博,邵士海. 协作干扰时频同步误差对安全通信性能影响[J]. 西安电子科技大学学报, 2022, 49(3): 1-9.

XIAO Shanghui,CHEN Yanming,WANG Ziyu,GUO Wenbo,SHAO Shihai. Impact of cooperative jamming time-frequency synchronization errors on secure communication performance[J]. Journal of Xidian University, 2022, 49(3): 1-9.

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参数名	取值
序列长度	1 023
信号带宽/MHz	10
统计次数	10 000
干信比/dB	10

协作干扰时频同步误差对安全通信性能影响

Impact of cooperative jamming time-frequency synchronization errors on secure communication performance

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