基于信道特征和随机插值的物理层算法

doi:10.3969/j.issn.1006-2475.2020.04.018

计算机与现代化

基于信道特征和随机插值的物理层算法

(江苏科技大学电子信息学院,江苏镇江212000)

收稿日期:2019-09-29 出版日期:2020-04-22 发布日期:2020-04-24
作者简介:吴游(1981-),女,江苏镇江人,讲师,博士,研究方向:编码理论,无线通信,信号处理,E-mail: 3183510832@qq.com; 陈诚(1990-),男,安徽合肥人，硕士研究生,研究方向:物理层安全通信,信号处理,E-mail: 897908287@qq.com; 金龙(1996-),男,江苏南通人,硕士研究生,研究方向:物理层安全通信,信号处理。
基金资助:
江苏省博士后基金资助项目(1401014C)

Physical Layer Algorithm Based on Channel Feature and Random Interpolation

(School of Electronics and Information, Jiangsu University of Science and Technology, Zhenjiang 212000, China)

Received:2019-09-29 Online:2020-04-22 Published:2020-04-24

摘要/Abstract

摘要： 分析无线通信系统当下的安全现状及保护物理层安全的必要性，结合无线信道的密钥生成方法，提出一种基于正交频分复用（OFDM）系统并行调制特点的随机插值的物理层安全算法。该算法的核心思想是在共享密钥的控制下，通过对快速傅里叶逆变换（IFFT）后输出的数据符号进行随机插值，将原OFDM符号重构，使得非法用户难以正确解调信号，达到保护传输信息安全的目的。该算法基于物理层加密，可更好地保护空中接口和无线链路，并行加密的过程也降低了通信系统实现的复杂度。通过理论分析及仿真实验表明，新算法可有效对抗各种非法攻击，同时对通信系统的固有性能影响较小，且能较好地适应多径信道，表现出不错的抗多径衰落能力。

关键词: 物理层安全, 信道特征, 密钥生成, 正交频分复用, 随机插值

Abstract: The article studies the present safety situation of wireless communication system and the necessity of protecting physical layer security. Combined with the secret key generation method of wireless channel, a physical layer security algorithm for random interpolation based on the parallel modulation mode of Orthogonal Frequency Division Multiplexing (OFDM) system is proposed. The core idea of the algorithm is as follows, under the control of public secret key, data symbols which are output after Inverse Fast Fourier Transform (IFFT) are interpolated randomly, and the original OFDM symbol is reconstructed to make it difficult for illegal users to correctly demodulate the signal, so as to protect the security of transmission information. The algorithm is based on physical layer encryption, which can better protect air interface and wireless link. And the process of parallel encryption can reduce the complexity of communication system implementation. The results of theoretical analysis and simulation show that the algorithm can effectively withstand all kinds of illegal attacks, has little influence on the original performance of communication system, can be well adapted to multipath channel, and has a good ability to withstand multipath fading.

Key words: physical layer security, channel characteristics, secret key generation, Orthogonal Frequency Division Multiplexing (OFDM), random interpolation

中图分类号:

TN918.91

吴游,陈诚,金龙. 基于信道特征和随机插值的物理层算法[J]. 计算机与现代化, doi: 10.3969/j.issn.1006-2475.2020.04.018.

WU You, CHEN Cheng, JIN Long. Physical Layer Algorithm Based on Channel Feature and Random Interpolation[J]. Computer and Modernization, doi: 10.3969/j.issn.1006-2475.2020.04.018.

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基于信道特征和随机插值的物理层算法

Physical Layer Algorithm Based on Channel Feature and Random Interpolation

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