一种基于混合函数鉴相的改进型Costas环路  

A Modified Costas Loop Based on Phase Discrimination Utilizing Mixed Function

作　　者：韩强[1] 钟升[1] 张盼[1] 杨恒[2] 

机构地区：[1]西安微电子技术研究所,西安710065 [2]西安通信学院,西安710106

出　　处：《微处理机》2015年第5期14-17,共4页Microprocessors

摘　　要：针对SC-FDE系统中,基于Zadoff-Chu序列频偏估测方法存在的相位模糊问题,提出一种基于混合函数鉴相的改进型Costas环路方案。经MATLAB软件仿真验证,该方案能显著改善频偏估测模糊问题。经FPGA系统验证,该方案中的改进型Costas环路相较传统Costas环路拥有入锁时间短的优点。该方案结构简单易于实现,具有良好的工程应用价值。A modified Costas loop based on phase discrimination, uunzmg mlxeu tuHcuuu, ,~ proposed in this paper to resolve the fuzzy problem of frequency offset estimation in Zadoff - Chu sequence. The simulations show the fuzzy problem of frequency offset estimation is improved significantly and the lock time is greatly shortened comparing to the traditional one. In a word, this new modified Costas loop has great value in engineering application.

关 键 词：频偏估测 入锁时间 改进型Costas环路 鉴相 Zaddof_Chu序列 符号函数 

分 类 号：TN919.3[电子电信—通信与信息系统]