摘要
针对现有时分长期演进(TD-LTE)系统定时同步算法复杂度过高以及抗频偏性能较差的问题,提出一种基于辅同步信号(SSS)时域共轭对称性的定时同步算法。该方法对接收信号本身进行滑动共轭对称相关运算,在明显的相关峰值处捕获SSS,然后利用捕获到的SSS的位置联合小区组内ID检测,实现循环前缀(CP)类型的判决,从而完成了定时同步。理论分析和仿真结果表明,该方法具有很强的抗频偏性能、低复杂度,且较常规算法可靠性有了很大提高,同时在多径信道下性能良好。该方法已成功应用于TD-LTE第三方终端探测系统中,验证了其可行性。
To deal with high computing complexity and bad anti-CFO （ anti-Cartier Frequency Offset） performance of conventional time synchronization algorithms for Time Division Long Term Evolution （TD-LTE） system, an improved algorithm based on Secondary Synchronization Signal （SSS） conjugate-symmetric in time domain was proposed in this paper. For the algorithm, SSS location was estimated as the peak of cross-correlation of received signal and its time reversal. And by combining SSS location with the detection of cell group ID, CP （ Cyclic Prefix） type could also be judged. Analysis and simulation results demonstrate that the improved algorithm has low computing complexity, good performs on anti-CFO and better reliability compared with normal methods, especially, it also has good performs in multi-path channels. By applying to the third party TD-LTE UE detecting system, the algorithm is proved to be effective and feasible.
出处
《计算机应用》
CSCD
北大核心
2014年第7期1974-1977,1987,共5页
journal of Computer Applications
基金
国家科学与技术重大专项(2012ZX03006002003)
重庆市基础与前沿研究计划项目(cstc2013jcyjA40041)
重庆市教委科学技术研究项目(KJ130528)
重庆市教委优秀成果转化项目(Kjzh11206)
重庆邮电大学博士启动基金资助项目(A2012-33)
重庆邮电大学青年科学研究项目(A2012-77)
关键词
时分长期演进
定时同步
辅同步信号
循环前缀类型
Time Division Long Term Evolution （TD-LTE）
time synchronization
Secondary Synchronization Signal （SSS）
Cyclic Prefix （CP） type
