通信学报 ›› 2023, Vol. 44 ›› Issue (12): 78-85.doi: 10.11959/j.issn.1000-436x.2023233

• 学术论文 • 上一篇    

新型直接序列扩频通信方法

辜方林1, 彭进霖2, 黄育侦2, 曹圣群3, 赵海涛1, 魏急波1   

  1. 1 国防科技大学电子科学学院，湖南 长沙 410073
    2 军事科学院，北京 100097
    3 智能感知与处理实验室，北京 100094
  • 修回日期:2023-11-13 出版日期:2023-12-01 发布日期:2023-12-01
  • 作者简介:辜方林（1986- ），男，湖南娄底人，博士，国防科技大学副教授，主要研究方向为可靠无线通信
    彭进霖（1986- ），男，山东济南人，博士，军事科学院研究员，主要研究方向为无人集群通信
    黄育侦（1986- ），男，福建莆田人，博士，军事科学院研究员，主要研究方向为无人集群通信
    曹圣群（1966- ），男，北京人，博士，智能感知与处理实验室正高级工程师，主要研究方向为智能感知、高可靠通信
    赵海涛（1981- ），男，山东昌乐人，博士，国防科技大学教授，主要研究方向为多信道认知组网、无人集群通信
    魏急波（1967- ），男，湖北汉川人，博士，国防科技大学教授，主要研究方向为智能无线通信、软件无线电
  • 基金资助:
    国家自然科学基金资助项目(61931020)

Novel direct sequence spread spectrum communication method

Fanglin GU1, Jinlin PENG2, Yuzhen HUANG2, Shengqun CAO3, Haitao ZHAO1, Jibo WEI1   

  1. 1 School of Electronic Science, National University of Defense Technology, Changsha 410073, China
    2 Chinese Academy of Military Science, Beijing 100097, China
    3 Intelligent Perception and Processing Laboratory, Beijing 100094, China
  • Revised:2023-11-13 Online:2023-12-01 Published:2023-12-01
  • Supported by:
    The National Natural Science Foundation of China(61931020)

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摘要：

针对传统直接序列扩频通信复杂多径环境下性能受限且频谱利用效率低的问题，提出了一种时频混合直接序列扩频接收机结构的循环前缀（CP）块传输结构扩频系统，采用频域最大比合并（MRC）同时实现均衡和解扩过程，在获得最佳接收性能的同时，省略了 IFFT 过程，显著降低了计算复杂度。在此基础上，提出了利用恒包络零自相关（CAZAC）序列取代 m 序列作为扩频序列，在不增加计算复杂度的同时显著提升系统的性能。最后，提出了一种基于循环码移位键控（CCSK）的高速扩频通信方法，解决了传统直接序列扩频频谱利用效率低、传输速率受限的问题，并利用傅里叶变换时域循环移位的性质，设计了一种低实现复杂度的CCSK解扩方法，将CCSK解扩所需的乘法次数由O(N2)降为O(N log N)，极大减少了资源消耗。仿真结果表明，相较于已有直接序列扩频方法，所提方法无论是在高斯还是复杂多径信道环境下均获得了3 dB左右的性能增益。

关键词: 直接序列扩频, 最大比合并, 循环码移位键控, 实现复杂度

Abstract:

In response to the problem of limited performance and low spectral efficiency in complex multipath environments of traditional direct sequence spread spectrum communication, a cyclic prefix (CP) block transmission structure spread spectrum system with a time-frequency hybrid direct sequence spread spectrum receiver structure was proposed.The system adopted maximum ratio combination (MRC) in the frequency domain to achieve equalization and de-spreading processes simultaneously, while achieving optimal reception performance and omitting the IFFT process to reduce computational complexity significantly.On this basis, it was proposed to replace the m-sequence with the constant amplitude zero auto correlation (CAZAC) sequence as the spread spectrum sequence, which significantly improved the system performance without increasing computational complexity.Finally, a high-speed spread spectrum communication method based on cyclic code shift keying (CCSK) was proposed to solve the problems of low spectrum utilization efficiency and limited transmission rate in traditional direct sequence spread spectrum.By utilizing the property of Fourier transform time-domain cyclic shift, a low implementation complexity CCSK decoding method was designed, which reduced the multiplication number required for CCSK de-spreading by O(N2) reduced to O (Nlog N), greatly reducing resource consume.The simulation results show that compared to existing direct sequence spread spectrum methods, the proposed method achieves approximately 3 dB gain in both Gaussian and complex multipath channel environments.

Key words: direct sequence spread spectrum, maximum ratio combination, cyclic code shift keying, implementation complexity

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