基于QCSK的持续噪声式隐蔽传输方案  

Continuous noise covert transmission scheme based on QCSK

作　　者：黄英[1] 万泽含 雷菁[1] 赖恪 HUANG Ying;WAN Zehan;LEI Jing;LAI Ke(College of Electronic Science and Technology,National University of Defense Technology,Changsha 410073,China)

机构地区：[1]国防科技大学电子科学学院,湖南长沙410073

出　　处：《通信学报》2022年第4期123-132,共10页Journal on Communications

基　　金：湖南省自然科学基金资助项目(No.2021JJ30777)。

摘　　要：针对现有的嵌入式方案要求隐蔽系统的发射功率必须远小于宿主系统,隐蔽传输的可靠性较差的问题,提出了基于QCSK的持续噪声式隐蔽通信方案。发送端将包含隐蔽信息的QCSK信号与人工噪声交替发送,通过保持噪声的持续性有效对抗非法能量检测,同时在时域、频域均具有强隐蔽性。该方案不再要求隐蔽系统发射功率极低,在保证宿主性能的前提下允许增大隐蔽系统的发射功率,提升隐蔽传输的性能。通过对所提方案进行仿真分析,当宿主系统误码率为1×10-7时,隐蔽传输误码率较现有方案提升了2个数量级。The existing embedded scheme requires far lower transmission power of the covert system than that of the host system,and thus decreasing the reliability of covert transmission.To figure out the above limitations,a continuous noise covert communication scheme based on quadrature chaos shift keying(QCSK) was proposed.The QCSK signal containing covert information and artificial noise were transmitted alternately,and the illegal energy detection was effectively resisted by the continuity of noise which has strong concealment in both time and frequency domains.Furthermore,extremely low power was not required to meet the demand of convert communication in QCSK,whereas allowing the increase of transmit power under the condition that the performance of the host system to improve the performance of covert transmission.Theoretical analysis and simulation results show that the bit error rate(BER) of covert transmission brings two orders of magnitude improvement compared with the existing scheme at BER=1×10-7 for host system.

关 键 词：隐蔽通信 功率分配 人工噪声 混沌键控 

分 类 号：TN918.4[电子电信—通信与信息系统]