基于二级混沌映射的OFDM安全传输方案

doi:10.11959/j.issn.1000-436x.2016141

摘要/Abstract

摘要：

基于OFDM技术，结合混沌序列的伪随机特性和初值敏感性，提出了一种数据相位混沌旋转和子载波混沌映射的安全传输方案。仿真结果和分析表明，该方案能够有效地对信息进行混沌安全传输，增强输出信号的随机特性，窃听方无法通过信号的统计特性估计出发送信息，从而保证通信的安全性。与常用的安全措施，如AES（高级加密标准）、多天线随机化传输矩阵等方法相比，所述方案能够达到较好的计算安全性。

关键词: 安全通信, 混沌映射, OFDM, 相位旋转, 子载波映射

Abstract:

A secure OFDM transmission scheme based on two-stage chaos mapping was introduced, which were cha-oticphase rotation and sub-carrier chaos mapping. The characteristics of pseudo-random and sensitivity to initial condi-tions of chaos sequences were employed. Numerical results and analysis show that the scheme canensure secure informa-tion transmission,and improve the pseudo-randomness of transmitted signals. The eavesdropper cannot estimate the mes-sage from statistic characteristics of received signals, which guarantees the communication security. Compared with tra-ditional methods like advanced encryption standard, randomization of MIMO transmission coefficients, the scheme shows favorable computation security.

Key words: secure communication, chaos mapping, OFDM, phase rotation modulation, sub-carrier mapping

王颖,张晓忠,曾娟,汪永明. 基于二级混沌映射的OFDM安全传输方案[J]. 通信学报, 2016, 37(7): 132-139.

Ying WANG,Xiao-zhong ZHANG,Juan ZENG,Yong-ming WANG. Secure OFDM transmission scheme based on two-stage chaos mapping[J]. Journal on Communications, 2016, 37(7): 132-139.

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参考文献 14

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参数	AWGN信道	瑞利快衰落信道	频率选择衰落信道
调制方式	QPSK	QPSK	QPSK
信道编码	(2,1,2)卷积码	(2,1,2)卷积码	(2,1,2)卷积码
均衡方式	无	ZF/MMSE	ZF
数据帧长	256	256	256
数据帧数	2 000	2 000	2 000
子载波数	256	256	256

应用	加密措施	密钥数	破解时间
RF fingerprint	24-bit DES	1.7×10⁸	8.4 ms
IS-95 CDMA	42-bit LFSR	4.4×10¹²	2.2 s
AES CDMA	128-bit AES	3.4×10³⁸	5.4×10¹⁸年
Rand-MIMO	随机矩阵	3.4×10³⁸	5.4×10¹⁸年
OFDM	两级混沌映射	1.8×10³⁹	2.4×10²⁹年

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