并行载波索引差分混沌移位键控通信方案  

Parallel carrier index differential chaos shift keyingcommunication scheme

作　　者：孟竹 杨华[1] 马新玉 蒋国平 MENG Zhu;YANG Hua;MA Xinyu;JIANG Guoping(College of Electronic and Optical Engineering&College of Flexible Electronics(Future Technology),Nanjing University of Posts and Telecommunications,Nanjing 210023,China;College of Automation&College of Artificial Intelligence,Nanjing University of Posts and Telecommunications,Nanjing 210023,China)

机构地区：[1]南京邮电大学电子与光学工程学院、柔性电子(未来技术)学院,江苏南京210023 [2]南京邮电大学自动化学院、人工智能学院,江苏南京210023

出　　处：《系统工程与电子技术》2025年第2期650-658,共9页Systems Engineering and Electronics

基　　金：国家自然科学基金(61971240)资助课题。

摘　　要：为提高载波索引差分混沌移位键控通信系统的传输速率和频谱效率,提出一种并行载波索引差分混沌移位键控通信方案。发射端重复使用有限的载波索引资源进行多次索引调制,生成多路信息信号并借助正交Walsh码实现并行传输;接收端利用各路信息信号之间的相似性,在分段降噪和不同路信息信号之间相关值的基础上完成解调。推导所提方案在加性高斯白噪声和多径Rayleigh衰落信道中的理论误码率(bit error rate, BER)并完成仿真验证。结果表明,所提方案不但可以大幅提升频谱效率,而且可以明显改善BER性能。To improve the bit rate and spectral efficiency of carrier index differential chaos shift keying(DCSK)communication system,a parallel carrier index DCSK communication scheme is proposed.Transmitter performs index modulation on a number of carriers for several times and generates multiple data-bearing signals.These signals are transmitted simultaneously based on orthogonal Walsh codes.To explore the similarity among different data-bearing signals,demodulation is performed based on noise reduction and correlations between different data-bearing signals.Theoretical bit error rate(BER)expressions are derived and simulated in the additive white Gaussion noise and multipath Rayleigh fading channels.Results show that the proposed scheme can significantly improve both the spectral efficiency and BER rate performance.

关 键 词：差分混沌移位键控 载波索引调制 WALSH码 频谱效率 比特误码率 

分 类 号：TN918[电子电信—通信与信息系统]