基于施密特正交化的降噪多载波相关延迟键控混沌通信系统  

NR-MC-CDSK Chaotic Communication System Based on Schmidt Orthogonalization

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：《电子与信息学报》2021年第7期1930-1938,共9页Journal of Electronics & Information Technology

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

摘　　要：为解决传统相关延迟键控(CDSK)混沌通信系统存在的误码(BER)性能差的问题,该文提出一种基于施密特正交化的降噪多载波相关延迟键控(NR-MC-CDSK)混沌通信系统。在发送端,利用施密特正交化算法产生N组完全正交的混沌载波,并复制P次作为参考信号,与N个信息信号叠加进行传输,并利用多载波技术,复用每帧信号传输MN个用户信息。在接收端,将信号经匹配滤波器解调,然后通过滑动平均滤波器降噪,并进行相关解调。推导了系统在加性高斯白噪声(AWGN)信道和多径Rayleigh衰落信道中的BER公式并进行了仿真分析,结果表明系统的BER性能优于众多多载波混沌通信系统,数据传输速率也相较CDSK系统有明显提升,为该系统在实际通信系统中的应用提供了理论依据,并显示了较强的应用价值。In order to solve the shortcomings of high Bit Error Rate(BER)in traditional Correlation Delay Shift Keying(CDSK)chaotic communication system,a Noise Reduction Multi-Carrier Correlated Delay Shift Keying(NR-MC-CDSK)chaotic communication system based on Schmidt orthogonalization is proposed.At the transmitter,Schmidt orthogonalization algorithm is used to generate N completely orthogonal chaotic signals which are copied P times as reference signals.N information signals are added up for transmission in each group and multi-carrier is used to transmit MN user information per frame.At the receiver,the signal is demodulated by a matched filter,then the signal is averaged by a moving average filter to suppress the noise and demodulated by correlation.The BER formula of the system in Additive White Gaussian Noise(AWGN)channel and multipath Rayleigh fading channel are derived and simulated.The results show that the BER performance of the system is better than that of many multi-carrier chaotic communication systems and the data transmission rate is improved obviously compared with CDSK system.Theoretical basis for the future application of the system to practical communication systems is provided in the paper and shows strong feasibilities in future engineering application.

关 键 词：混沌通信 延迟相关键控 施密特正交化 降噪 多载波 

分 类 号：TN911.3[电子电信—通信与信息系统]