基于相似度的NPLC-DSSS信号扩频码盲估计  

Blind Estimation for Spread Spectrum Code of NPLC-DSSS Signal Based on Similarity

作　　者：强幸子 金翔 张天骐[3] QIANG Xing-zi;JIN Xiang;ZHANG Tian-qi(School of Internet,Anhui University,Hefei,Anhui 230031,China;Chongqing Airport Expansion Headquarters,Chongqing Airport Group Co.Ltd.,Chongqing 401120,China;School of Communication and Information Engineering,Chongqing University of Posts and Telecommunications(CQUPT),Chongqing 400065,China)

机构地区：[1]安徽大学互联网学院,安徽合肥230031 [2]重庆机场集团有限公司重庆机场扩建指挥部,重庆401120 [3]重庆邮电大学通信与信息工程学院,重庆400065

出　　处：《电子学报》2022年第8期2043-2048,共6页Acta Electronica Sinica

基　　金：国家重点研发计划(No.2017YFB0503400);国家自然科学基金(No.U2033215,No.U1833125,No.61803037,No.61671095);信号与信息处理重庆市市级重点实验室建设项目(No.CSTC2009CA2003)。

摘　　要：针对非周期长码直接序列扩频(Non-Periodic Long Code Direct Sequence Spread Spectrum,NPLC-DSSS)信号扩频码盲估计的问题,在已知扩频周期,信息码码元宽度以及码速率的条件下,本文提出了一种基于相似度的伪码序列盲估计方法.该方法通过构造信息码库,利用平均相似度对信息码进行同步,再利用特征值分解对扩频码序列进行估计.仿真实验表明,该算法较现有算法不仅抗噪声性能提高了1 dB,而且能够对信息码同步位置及伪码序列进行联合盲估计.With focus on blind estimation of the pseudo-noise(PN)sequence of a non-periodic long code direct sequence spread spectrum(NPLC-DSSS)signal,a blind estimation approach of PN sequence and synchronous position of information code is proposed based on mean similarity.In this method,the information code library is constructed,the average similarity is used to synchronize the information codes,and eigenvalue decomposition is used to estimate the PN sequence.Simulation results show that compared with the existing algorithms under the same condition,the proposed algorithm not only improves estimation performance by 1 dB,but also can estimate synchronous position of information code and PN sequence jointly.

关 键 词：非周期长码直扩信号 扩频码 信息码盲同步 平均相似度 特征分解 

分 类 号：V221.3[航空宇航科学与技术—飞行器设计] TN911[电子电信—通信与信息系统]