新型MU-FM-DCSK保密通信系统  

A Novel MU-FM-DCSK Secure Communication System

作　　者：张刚[1] 李泽金[1] 张天骐[1] 

机构地区：[1]重庆邮电大学信号与信息处理重庆市重点实验室,重庆400065

出　　处：《上海交通大学学报》2016年第5期776-781,共6页Journal of Shanghai Jiaotong University

基　　金：国家自然科学基金(61371164;61071196;61102131);教育部新世纪优秀人才支持计划(NCET-10-0927);信号与信息处理重庆市市级重点实验室建设项目(CSTC2009CA2003);重庆市杰出青年基金(CSTC2011jjjq40002);重庆市自然科学基金(CSTC2012JJA40008);重庆市教育委员会科研项目(KJ120525;KJ130524)资助

摘　　要：针对差分混沌键控系统传输率低、保密性不强等缺陷,提出了一种新型MU-FM-DCSK保密通信系统.该方案中,多个用户发送的信息信号分别乘以不同的调整参数后再由调频混沌信号调制.接收端使用相关解调,通过判决相关器输出的不同电平,解调出每个用户发送的信息信号,系统保密性得到明显增强,传输率大大提升.分析及仿真结果表明,系统的误码率在信噪比增加到一定程度时,明显低于现有的多用户混沌键控保密通信系统.In view of the defects of low data rate and low security in differential chaos shift keying（DCSK）,a novel multiple user-frequency modulation-differential chaos shift keying（MU-FM-DCSK）secure communication system was proposed.In the new scheme,the information of different users was multiplied by different adjusting parameters and was modulated by the frequency modulated chaotic signal.The receiver used the correlation demodulation through which the information could be restored by detecting the different output of the correlator.Therefore,the security of the system was significantly enhanced,and the data rate was greatly raised.The analysis and simulation results show that the BER in the proposed scheme is significantly superior to that of the existing multi-user chaos shift keying communication system,especially as the SNR increases above a certain threshold.

关 键 词：多用户 差分混沌键控 调整参数 误码率 调频 

分 类 号：TN911.3[电子电信—通信与信息系统]