带残余频偏的LSC-DS-CDMA信号伪码估计  

Pseudo code estimation of LSC-DS-CDMA signal with residual frequency offset

作　　者：潘微宇 赵知劲[1,2] Pan Weiyu;Zhao Zhijin(School of Communication Engineering,Hangzhou Dianzi University,Hangzhou 310018,China;State Key Lab of Information Control Technology in Communication System of No.36 Research Institute,China Electronic Technology Corporation,Jiaxing 314001,China)

机构地区：[1]杭州电子科技大学通信工程学院,浙江杭州310018 [2]中国电子科技集团第36研究所通信系统信息控制技术国家级重点实验室,浙江嘉兴314001

出　　处：《电子技术应用》2022年第6期58-63,共6页Application of Electronic Technique

基　　金：国家自然科学基金(61571172)。

摘　　要：针对带残余频偏的长短码直扩码分多址信号伪码估计问题,首先利用短码和长码的周期性分段接收信号构建信号矩阵;其次采用特征值分解法得到带残余载波的用户特征向量子空间,并采用全数字锁相环跟踪、消除残余频偏;然后利用Givens矩阵对特征向量组成的荷载矩阵进行旋转,提出结合随机差分和模拟退火思想的鲸鱼优化算法,寻求方差最小化的最佳旋转角,从而估计各用户的复合码片段并依次拼接;最后利用梅西算法和相关运算估计各用户的长码和短码。仿真结果验证了该算法对带残余频偏的LSC-DS-CDMA信号伪码估计的有效性。Aiming at the problem of estimation of long and short code direct spread code division multiple access signal with residual frequency offset,firstly,the signal matrix is constructed by using the periodic piecewise received signals of short code and long code.Secondly,the eigenvalue decomposition method is used to obtain the user eigenvector sub-space with residual carrier,and the digital phase-locked loop is used to track and eliminate the residual frequency offset.Then,the Givens matrix is used to rotate the load matrix composed of eigenvectors,and a whale optimization algorithm combined with random difference and simulated annealing is proposed to find the best rotation angle to minimize variance,so as to estimate the composite code segments of each user and splice them in turn.Finally,Berlekamp-Messay algorithm and correlation operation are used to estimate the long code and short code of each user.Simulation results verify the effectiveness of the proposed algorithm for pseudo code estimation of LSC-DS-CDMA signals with residual frequency offset.

关 键 词：长短码直扩码分多址 数字锁相环 Givens旋转 鲸鱼优化算法 梅西算法 

分 类 号：TN914.42[电子电信—通信与信息系统]