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1、第3卷第5期信息安全学报Vol.3No.52018年9月JournalofCyberSecuritySeptember,2018基于极化状态调制的无线通信物理层安全传输技术11,21,2李敏,梁莉莉,魏冬1中国科学院信息工程研究所北京中国1000932中国科学院大学北京中国100049摘要针对无线通信系统中物理层信息安全风险问题,提出了一种基于极化状态调制的物理层安全传输技术。在无线通信中,引入极化状态调制,在经典的空域、时频域的基础上,增加了对信号极化域的描述。一方面,设计高维星座映射方案,利用信号的幅度、相位和极化状态共同承载信息,将传统调制技
2、术和极化状态调制有效地结合在一起;另一方面,在高维星座映射方案的基础上,进一步设计基于去极化效应的信道预编码机制,通过增大Bob和Eve在极化域的信道差异实现物理层保密传输。安全性分析和仿真实验结果表明,利用该机制能够提升系统的保密容量,在接收信噪比为22dB时,窃听者接收到的星座图仍然是十分紊乱的,无法恢复出有效信息。关键词物理层安全;极化状态调制;高维星座映射;去极化效应;信道预编码中图法分类号TN918.91DOI号10.19363/J.cnki.cn10-1380/tn.2018.09.09PhysicalLayerSecurityTran
3、smissionTechnologyBasedonPolarization-ShiftKeyinginWirelessCommunications11,21,2LIMin,LIANGLili,WEIDong1InstituteofInformationEngineering,ChineseAcademyofSciences,Beijing100093,China2UniversityofChineseAcademyofSciences,Beijing100049,ChinaAbstractAimingatthephysicallayerinform
4、ationsecurityriskinthewirelesscommunicationsystem,aphysicallayersecuritytransmissiontechnologybasedonpolarizationshiftkeying(POLSK)isproposedinthispaper.Inwirelesscom-munications,POLSKisintroduced,andthedescriptionofthesignalinpolarizationdomainisaddedonthebasisoftheclassicala
5、irspace,timeandfrequencydomains.Ontheonehand,thehigh-dimensionalconstellationmappingschemeisdesigned.Utilizetheamplitude,phase,andpolarizationstatesofthesignaltocarryusefulinformation,sothatthetradi-tionalmodulationtechnologyandPOLSKcanbeeffectivelycombinedtogether.Ontheotherh
6、and,basedonthehigh-dimensionalconstellationmappingscheme,thechannelprecodingmechanismbasedonthedepolarizationeffectisfurtherdesignedtorealizethephysicallayerconfidentialtransmissionbyincreasingthechanneldifferencebetweenBobandEveinthepolarizeddomain.Securityanalysisandsimulati
7、onandexperimentresultsshowthat,themechanismcanimprovethesystem’ssecrecycapacity.Whenthereceivedsignaltonoiseratio(SNR)is22dB,thereceivedconstellationisstillverychaoticandcannotrecovertheeffectiveinformation.Keywordsphysicallayersecurity;polarizationshiftkeying;high-dimensional
8、constellationmapping;depolarizationef-fect;channelprecoding覆盖