通信学报2023，Vol.44Issue(12)：78-85,8.DOI:10.11959/j.issn.1000-436x.2023233
新型直接序列扩频通信方法
Novel direct sequence spread spectrum communication method
摘要
Abstract
In response to the problem of limited performance and low spectral efficiency in complex multipath environ-ments 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 effi-ciency 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 re-duced 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.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Key words
direct sequence spread spectrum/maximum ratio combination/cyclic code shift keying/implementation complexity分类
信息技术与安全科学引用本文复制引用
辜方林,彭进霖,黄育侦,曹圣群,赵海涛,魏急波..新型直接序列扩频通信方法[J].通信学报,2023,44(12):78-85,8.基金项目
国家自然科学基金资助项目(No.61931020)The National Natural Science Foundation of China(No.61931020) （No.61931020）
