一种新的分布式MIMOOFDM系统同步算法

作者：张维校，刘顺兰，曾 嵘 日期：2010-09-08/span> 浏览：3831 查看PDF文档

一种新的分布式MIMOOFDM系统同步算法

张维校，刘顺兰，曾 嵘

（杭州电子科技大学 通信工程学院，浙江 杭州 310018）
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摘要：针对不等周期同步算法多段重复引起的同步峰值模糊的问题，提出了一种适用于多输入/多输出正交频分复用（MIMOOFDM）系统的定时同步算法，算法在原有的不等周期同步模式（UPSP）算法的基础上对其进行结构的优化，同时利用Zadoff_Chu序列良好的互相关性来提高算法的性能。仿真结果表明，提出的算法在AWGN和多径信道下能有效地进行定时同步，特别是在多径情况下，新算法较UPSP算法能更有效地提高准确定时概率。
关键词：多输入/多输出；正交频分复用；定时同步；Zadoff_Chu序列
中图分类号：TN929
文献标识码：A文章编号：1001-4551(2010)08-0111-03

A new synchronization algorithm for distributed MIMOOFDM system
ZHANG Weixiao, LIU Shunlan, ZENG Rong
(College of Communication Engineering, Hangzhou Dianzi University, Hangzhou 310018, China)
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Abstract: Aiming at solving timing metric plateau caused by unequal period synchronization patter(UPSP),a timing synchronization method for the distributed multipleinput multipleoutput(MIMO) orthogonal frequency division multiplexing(OFDM) systems was presented. The structure of UPSP algorithm was optimized by the proposed method and the good crosscorrelation of Zadoff_Chu sequence was utilized to get a sharper peak that was better than UPSP algorithm.The simulation results show that the proposed method provides high accuracy in detecting the different time offsets caused by the distributed transmitters of the MIMO OFDM systems and offers higher timing detection probability than UPSP algorithm.
Key words: multipleinput multipleoutput(MIMO); orthogonal frequency division multiplexing(OFDM); timing synchronization; Zadoff_Chu