降噪改进型多载波CDSK混沌通信系统  

Noise reduction improved multi-carrier CDSK chaotic communication system

作　　者：张刚[1] 和华杰 张鹏 ZHANG Gang;HE Huajie;ZHANG Peng(School of Communication and Information Engineering, Chongqing University of Posts and Telecommunications, Chongqing 400065, China;Office of Teaching Affairs, Chongqing University of Posts and Telecommunications, Chongqing 400065, China)

机构地区：[1]重庆邮电大学通信与信息工程学院,重庆400065 [2]重庆邮电大学教务处,重庆400065

出　　处：《系统工程与电子技术》2021年第5期1389-1397,共9页Systems Engineering and Electronics

基　　金：国家自然科学基金(61771085,61371164);重庆市教育委员会科研项目(KJ1600407,KJQN201900601)资助课题。

摘　　要：由于传统相关延迟移位键控(correlation delay shift keying,CDSK)系统误码率(bit error rate,BER)较高,提出一种降噪改进型多载波CDSK(noise reduction improved multi-carrier CDSK,NR-I-MC-CDSK)混沌通信系统。在发送端,利用编辑器对混沌信号发生器进行改进,使得每一路信息信号在一帧内可以传输2 bit,并结合多载波技术,每个复帧可传输2N bit。在接收端,采用滤波器降噪的方法来减少判决变量中干扰项的方差,之后通过过零解调出对应的信息比特。利用两种不同的信道模型,对系统在理想信道情况以及实际信道情况下的信号传输过程进行了研究,并推导了系统在不同信道条件下的BER公式,最后对系统进行了仿真与性能分析,结果显示所提出的混沌通信系统在BER和数据传输速率方面具有较好的性能。Due to the high bit error rate(BER)for traditional correlation delay shift keying(CDSK)system,a noise reduction improved multi-carrier CDSK(NR-I-MC-CDSK)system is proposed.At the transmitter,the chaotic signal generator is improved by using the editor so that each information signal can bear 2 bits of information.Then the system is combined with the multi-carrier technology to make each frame transmit 2N bits of information.At the receiver,the noise reduction method of filter is used to reduce the variance of the interference term in the decision variable and the corresponding information bit is demodulated through zero crossing.Using two different kinds of channel model,the system signal transmission process under the condition of ideal channel condition and the actual channel is studied.The BER formulae of the system under different channel conditions is derived.Finally,the simulation and performance analysis of the system are carried out.The results show that the proposed chaotic communication system has good performance in BER and data transmission rate.

关 键 词：混沌通信 相关延迟移位键控 降噪 多载波 

分 类 号：TN911.3[电子电信—通信与信息系统]