基于带指数调制的OFDM系统(Orthogonal Frequency Division Multiplexing with Index Modulation,OFDM-IM)以其潜在的分集增益而被人们所熟知。随后,一种基于遗传算法的全索引调制的OFDM(GA-OFDM-AIM)方案被提出,与传统的OFDM-IM相比,...基于带指数调制的OFDM系统(Orthogonal Frequency Division Multiplexing with Index Modulation,OFDM-IM)以其潜在的分集增益而被人们所熟知。随后,一种基于遗传算法的全索引调制的OFDM(GA-OFDM-AIM)方案被提出,与传统的OFDM-IM相比,其采用遗传算法辅助子块设计,通过交叉、变异和选择过程,得到了低误码率的子块实现,但由于窃听者可以通过搜索算法或检测信道中的子块,传输安全无法得到保证,为此提出了基于遗传算法的全索引调制的物理层加密算法。利用无线信道特点,采用密钥生成技术提取初始密钥并且作为混沌发生器的初始值产生混沌序列,再利用该混沌序列对GA-OFDM-AIM中的子块进行星座点映射和星座旋转,打乱了星座阶数和调制类型的特征,使得窃听者难以破解系统的参数。为验证该算法的有效性和安全性,分析了不同的攻击模型,并比较了加密前后星座的误码性能。安全分析和仿真结果表明,该方案能有效地提高系统的安全性和传输性能。展开更多
针对高速移动场景中人机混编通信模式下的安全问题展开研究,提出基于时延多普勒(Delay Doppler, DD)域密钥提取的正交时频空—物理层加密(Orthogonal Time Frequency Space-Physical Layer Encryption, OTFS-PLE)方法。该方法充分利用...针对高速移动场景中人机混编通信模式下的安全问题展开研究,提出基于时延多普勒(Delay Doppler, DD)域密钥提取的正交时频空—物理层加密(Orthogonal Time Frequency Space-Physical Layer Encryption, OTFS-PLE)方法。该方法充分利用快时变信道在DD域中的稀疏性,高效准确地估计信道路径的增益、多普勒频移和时延大小,生成安全可靠的初始密钥,再通过Tent序列将初始密钥扩展成加密密钥,根据密钥对OTFS的星座点进行相位扰乱,实现高效的加解密。该方法解决了高速移动场景人机混编通信中的密钥提取难的问题,能生成可靠的密钥并实现人机混编系统安全高效的加密通信。展开更多
Massive multiple input and multiple output(MIMO) is a key technology of the fifth generation(5 G) wireless communication systems, which brings various advantages, such as high spectral efficiency and energy efficiency...Massive multiple input and multiple output(MIMO) is a key technology of the fifth generation(5 G) wireless communication systems, which brings various advantages, such as high spectral efficiency and energy efficiency. In MIMO system, spatial modulation(SM) has recently emerged as a new transmission method. In this paper, in order to improve the security in SM-MIMO, a physical layer encryption approach named chaotic antenna-index three-dimensional modulation and constellation points rotated(CATMCPR) encryption scheme is proposed, which utilizes the chaotic theory and spatial modulation techniques. The conventional physical-layer encryption in SM-MIMO suffers from spectral efficiency(SE) performance degradation and usually needs a preshared key, prior channel state information(CSI) or excess jamming power. By contrast, we show that the CATMCPR scheme can not only achieve securely communication but also improve above drawbacks. We evaluate the performances of the proposed scheme by an analysis and computer simulations.展开更多
文摘基于带指数调制的OFDM系统(Orthogonal Frequency Division Multiplexing with Index Modulation,OFDM-IM)以其潜在的分集增益而被人们所熟知。随后,一种基于遗传算法的全索引调制的OFDM(GA-OFDM-AIM)方案被提出,与传统的OFDM-IM相比,其采用遗传算法辅助子块设计,通过交叉、变异和选择过程,得到了低误码率的子块实现,但由于窃听者可以通过搜索算法或检测信道中的子块,传输安全无法得到保证,为此提出了基于遗传算法的全索引调制的物理层加密算法。利用无线信道特点,采用密钥生成技术提取初始密钥并且作为混沌发生器的初始值产生混沌序列,再利用该混沌序列对GA-OFDM-AIM中的子块进行星座点映射和星座旋转,打乱了星座阶数和调制类型的特征,使得窃听者难以破解系统的参数。为验证该算法的有效性和安全性,分析了不同的攻击模型,并比较了加密前后星座的误码性能。安全分析和仿真结果表明,该方案能有效地提高系统的安全性和传输性能。
文摘针对高速移动场景中人机混编通信模式下的安全问题展开研究,提出基于时延多普勒(Delay Doppler, DD)域密钥提取的正交时频空—物理层加密(Orthogonal Time Frequency Space-Physical Layer Encryption, OTFS-PLE)方法。该方法充分利用快时变信道在DD域中的稀疏性,高效准确地估计信道路径的增益、多普勒频移和时延大小,生成安全可靠的初始密钥,再通过Tent序列将初始密钥扩展成加密密钥,根据密钥对OTFS的星座点进行相位扰乱,实现高效的加解密。该方法解决了高速移动场景人机混编通信中的密钥提取难的问题,能生成可靠的密钥并实现人机混编系统安全高效的加密通信。
基金supported in part by the National Natural Science Foundation of China under Grant 61502518,61372098 and 61702536
文摘Massive multiple input and multiple output(MIMO) is a key technology of the fifth generation(5 G) wireless communication systems, which brings various advantages, such as high spectral efficiency and energy efficiency. In MIMO system, spatial modulation(SM) has recently emerged as a new transmission method. In this paper, in order to improve the security in SM-MIMO, a physical layer encryption approach named chaotic antenna-index three-dimensional modulation and constellation points rotated(CATMCPR) encryption scheme is proposed, which utilizes the chaotic theory and spatial modulation techniques. The conventional physical-layer encryption in SM-MIMO suffers from spectral efficiency(SE) performance degradation and usually needs a preshared key, prior channel state information(CSI) or excess jamming power. By contrast, we show that the CATMCPR scheme can not only achieve securely communication but also improve above drawbacks. We evaluate the performances of the proposed scheme by an analysis and computer simulations.
