基于正交频分复用调制的物理层并行插值加密算法  

Physical layer parallel interpolation encryption algorithm based on orthogonal frequency division multiplexing

作　　者：高宝建[1] 王少迪 胡云 曹艳军 GAO Baojian, WANG Shaodi , HU Yun, CAO Yanjun(College of Information Science and Technology, Northwest University, Xi an Shaanxi 710127, Chin)

机构地区：[1]西北大学信息科学与技术学院,西安710127

出　　处：《计算机应用》2018年第6期1628-1632,共5页journal of Computer Applications

基　　金：国家自然科学基金资助项目(61501372);陕西省自然科学基金资助项目(2017JM6012)~~

摘　　要：针对传统链路层安全机制不能从根本上保护无线通信系统信息传输安全的问题,提出了一种基于正交频分复用(OFDM)系统并行调制特性和物理层安全的并行插值加密算法。首先,根据OFDM系统调制的子载波数目确定插入符号个数,并通过密钥控制生成插入符号位置;然后,取出对应插入位置前后的原OFDM符号,并计算其平均值作为插入符号;最后,在反快速傅里叶变换(IFFT)后完成伪随机插值。与传统链路层安全机制相比,所提算法能实现调制符号整体加密,保证了信令、标志及数据信息的安全,并有效降低了算法实现复杂度。仿真实验结果表明,该算法能有效抵抗各种窃听攻击,对通信系统固有性能影响小,能较好地适应高斯信道和多径信道,且表现出一定的抗多径衰落能力。The traditional link layer security mechanism can not fundamentally protect the security of information transmission of wireless communication system. In order to solve the problem, a parallel interpolation encryption algorithm based on the parallel modulation characteristics of Orthogonal Frequency Division Multiplexing（OFDM） system and physical layer security was proposed. Firstly, the number of inserted symbols was determined by the number of subcarriers modulated by the OFDM system, and the positions of inserted symbols were generated under the control of key. Secondly, the original OFDM symbols before and after the position of inserted symbol were taken out, and the inserted symbol was determined by calculating the mean value of these symbols. Finally, the pseudo-random interpolation was completed after Inverse Fast Fourier Transform（IFFT）. Compared with the traditional link layer security methods, the proposed algorithm can realize the whole encryption of modulation symbols, ensure the security of signaling, flag and data information, and reduce the complexity of algorithm effectively. The simulation experimental results show that, the proposed algorithm can effectively resist a variety of eavesdropping attacks and has little influence on the inherent performance of communication system. Furthermore, the proposed algorithm can be well adapted to Gaussian channel and multipath channel, and shows a certain ability to resist multipath fading.

关 键 词：物理层安全 正交频分复用 插值加密 误符号率 多径信道 

分 类 号：TN918.91[电子电信—通信与信息系统]