带残余载波的LSC-DSSS信号伪随机码盲估计  

Pseudo Random Code Blind Estimation of LSC-DSSS Signal with Residual Carrier

作　　者：潘微宇 赵知劲[1,2] 王李军[2] PAN Weiyu;ZHAO Zhijin;WANG Lijun(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 Group Corporation,Jiaxing 314001,China)

机构地区：[1]杭州电子科技大学通信工程学院,杭州310018 [2]中国电子科技集团第三十六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：《火力与指挥控制》2022年第7期97-101,107,共6页Fire Control & Command Control

基　　金：国家自然科学基金资助项目(61571172,U19B2016)。

摘　　要：针对带残余载波的LSC-DSSS信号伪码估计困难的问题,研究了利用特征值分解法、全数字锁相环(digitalphaselockedloop,DPLL)和梅西算法的伪码盲估计方法。根据长码和短码周期对接收信号进行二次分段,利用矩阵特征值分解和酉矩阵去位置模糊估计带残余载波的复合码,利用DPLL和二次延迟相乘分别消除残余载波和复合码拼接的幅度模糊及短码的影响,利用梅西算法和相关运算,得到长码和短码的估计。仿真结果表明,在频偏为0.02,信噪比为-9.3dB以上时,该算法的长短码误码率可达到1%以下。As it is difficult to estimate the PN code of LSC-DSSS signal with residual carrier,a blind PN code estimation method based on eigenvalue decomposition,all-digital phase locked loop(DPLL)and Massey algorithm is studied.The received signal is segmented twice by using long code and short code periodically.Firstly,the composite code with residual carrier is amkigulously estimated by matrix eigenvalue decomposition and unitary matrix position removal.Then,the residual carrier is eliminated by DPLL,and the influence of amplitude ambiguity and short code is eliminated by quadratic delay multiplication.Finally,the estimation of long code and short code is obtained by Massey algorithm and correlation operation.The simulation results show that when the frequency offset is 0.02 and the signal-to-noise ratio is more than-9.3 dB,the bit error rate of long and short codes can reach less than 1%.

关 键 词：长短码直扩信号 残余载波 特征值分解 数字锁相环 梅西算法 

分 类 号：TN914.42[电子电信—通信与信息系统]