极低信噪比下的“极大检测—二次相关”帧同步算法  

“Maximum detection-Secondary Correlation”frame synchronization algorithm for very low SNR conditions

作　　者：杨卓凯 周亮[1] 

机构地区：[1]电子科技大学通信抗干扰技术国家级重点实验室,成都611731

出　　处：《北京信息科技大学学报（自然科学版）》2015年第2期9-13,共5页Journal of Beijing Information Science and Technology University

基　　金：中国电子科技集团基金资助项目"极低信噪比下抗干扰通信新技术研究"

摘　　要：研究极低信噪比条件下的帧同步问题,设计帧标识码为13比特巴克码与优选48比特同步序列的扩展复合序列,提出"相关阵列"的概念并由此导出"二次相关"的检测方法,同时用极大值判决法替代传统的最大相关值法,获得10 d B的同步性能增益。采取"帧同步多状态"检测机制,进一步获得5 d B的性能改善,并实现对同步态的保护。The problem of frame synchronization is studied under very low signal to noise ratio （SNR）. A composition of the 13 - bit barker code and the 48 - bit preferred synchronization sequence is adopted as the frame marker. The proposed synchronization algorithm utilizes a correlation array to calculate secondary order correlation and searches for local maximum correlation rather than the conventional maximum correlation detection. Simulation shows the proposed algorithm has a 10 dB performance gain over existing methods. Moreover, ＂ multi-states ＂ automats mode for frame synchronization is also designed, which is proved to be able to protect the synchronization state and achieve another 5 dB gain in SNR performance.

关 键 词：极低信噪比 帧同步 极大值检测 二次相关 非周期相关 

分 类 号：TN911[电子电信—通信与信息系统]