摘要
就非合作通信环境中的多用户扩频信号接收问题,分别针对上下行直序扩频通信系统,在载波检测、码速率估计和扩频序列周期检测的基础上设计并实现多用户条件下的扩频序列盲估计方案。首先,针对上行直接扩频信号中多用户之间扩频序列不同步的问题,完成基于Frobenius范数的失步时间估计,设计实现基于相关矩阵特征值分解的多用户扩频序列估计方案;其次,针对下行直接扩频信号中多用户功率相近难以分离的问题,设计并实现基于独立成分分析的多扩频序列盲估计方案。对上述方案进行仿真实验,结果表明所提出的扩频序列盲估计方案在上行和下行多用户扩频通信系统中均具有较高的识别准确率。
Aiming at signal detection for a direct-sequence spread spectrum(DSSS)system in non-cooperative communication environments,a blind spreading sequence estimation scheme is designed and implemented under multi-user conditions for uplink and downlink multi-user DSSS systems on the basis of carrier detection,code rate estimation,and cycle detection.Firstly,for the problem of unsynchronized spreading sequence among multiple users in the uplink,based on the estimation of out-of-synchronization time with the Frobenius norm,a multi-user sprea-ding sequence estimation scheme based on matrix eigenvalue decomposition is designed and im-plemented.Secondly,for the problem that the signal power of multiple users in the downlink di-rect spread spectrum signal is difficult to separate,a blind estimation scheme of multiple spread spectrum sequences based on independent component analysis is designed and implemented.Ex-periments on the above scheme are performed and the results showed that the proposed blind es-timation scheme has a high recognition accuracy in both uplink and downlink multi-user DSSS communications.
作者
谢伟
薛陈
夏畅雄
闫建朝
李昆鹏
XIE Wei;XUE Chen;XIA Changxiong;YAN Jianchao;LI Kunpeng(Southwest China Research Institute of Electronic Equipment,Chengdu 610036,China;University of Electronic Science and Technology of China,Chengdu 611731,China;Unit 93427 of PLA,Beijing 102207,China)
出处
《电子信息对抗技术》
北大核心
2021年第5期36-41,50,共7页
Electronic Information Warfare Technology
关键词
非合作通信
直接序列扩频
盲信号检测
non-cooperative communication
direct-sequence spread spectrum
blind signal detection
