定时同步中减小定时抖动的方法的研究与实现  

Research and Implementation of the Method for Reducing Timing Jitter in Timing Synchronization

作　　者：刘国建[1,2] 姚远程[1,2] 秦明伟[1,2] 

机构地区：[1]西南科技大学信息工程学院,四川绵阳621010 [2]特殊环境机器人技术四川省重点实验室,四川绵阳621010

出　　处：《自动化仪表》2015年第7期15-17,共3页Process Automation Instrumentation

基　　金：国防基础科研计划项目(编号:B3120133002);西南科技大学研究生创新基金资助项目(编号:14ycxjj0117)

摘　　要：在Gardner定时同步方法中,当达到同步时,小数插值间隔uk应该是一个固定值;但由于高斯噪声的影响,uk会产生定时抖动,这会延长同步建立时间,进而提高误码率。基于此,提出了一种简单可实现的减小定时抖动的方法。具体是在定时同步检测前后分别增加预滤波器模块和系数值为1的环路系数模块。使用Simulink软件搭建仿真模型并对上述改进进行仿真验证,仿真结果表明,该方法能够减小定时抖动,降低误码率。In the method of Gardner timing synchronization, when the system reaches synchronization, the fractional interpolation interval shall be a fixed value, however, because of the influence of Gaussian noise, uk may generate timing jitter, this will prolong the building period for synchronization and increase bit error rate. Thus the simple method for reducing timing jitter is proposed, that is ： adding a pre-filtering module and a loop coefficient module with coefficient value 1, before and after the timing synchronization detection respectively. The simulation model is built by using Simulink software, and simulation verification for the improvement is conducted. The results of simulation show that this method can reduce timing jitter and bit error rate.

关 键 词：GARDNER 高斯噪声 定时抖动 误码率 预滤波器 环路系数 

分 类 号：TH29[机械工程—机械制造及自动化] TN919[电子电信—通信与信息系统]