编码加扰序列的帧同步盲识别  

Blind Identification of Frame Synchronization in Scrambled Coding Sequence

作　　者：马钰[1] 张立民[1] 王好同[1] 

机构地区：[1]海军航空工程学院电子信息工程系,山东烟台264001

出　　处：《电子学报》2016年第9期2087-2092,共6页Acta Electronica Sinica

基　　金：泰山学者工程专项经费

摘　　要：在同步情况下,基于对偶码可有效重建线性扰码的反馈关系,但非合作通信方同样需要完成盲同步.在无噪声条件下,针对编码加扰序列的盲同步问题,结合反馈多项式检测提出了帧同步盲识别算法.利用初始帧同步中探测的反馈多项式倍式集,可同时完成扰码反馈多项式和扰码序列的估计.实现初始同步后,可借助解扰数据帧结构属性完成精确同步;然后,将算法推广到了含噪信道情况;最后,基于Walsh-Hadamard变换给出了检测统计量的规范计算方案,以降低计算复杂度.With a dual word,we can reconstruct the feedback polynomial of a linear scrambler when the synchronization is complete. An eavesdropper must achieve synchronization before recovering scrambler. Based on the algorithm of reconstruction of linear scrambler,we present techniques to achieve blind synchronization. We can get a set of multiples of the feedback polynomial when course synchronization is complete. Meantime,we can also recover the feedback polynomial and a scrambler sequence. Then,we need architecture of frame to achieve fine synchronization with the descrambled data. The study is based on the assumption that the channel is noiseless and then extended to the noisy channel condition. In order to reduce the computational complexity,we also propose a normal scheme to compute the statistic on the base of Walsh-Hadamard transformation.

关 键 词：对偶码 帧同步扰码 线性反馈移位寄存器 盲同步 Walsh-Hadamard变换 

分 类 号：TN919[电子电信—通信与信息系统]