用于MIMO OFDM系统的定时同步算法  

Time Synchronization Algorithm for MIMO OFDM Systems

作　　者：张建华[1,2] 冯冲[1,2] 刘毅[1] 张炎炎[1] 

机构地区：[1]北京邮电大学无线新技术研究所,北京100876 [2]泛网无线通信教育部重点实验室(北京邮电大学),北京100876

出　　处：《北京邮电大学学报》2009年第1期118-121,共4页Journal of Beijing University of Posts and Telecommunications

基　　金：国家自然科学基金项目(60772113);国家"863计划"项目(2006AA01Z283)

摘　　要：提出了一种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,算法利用恒幅零自相关码(CAZAC)的自相关特性及自反特性生成用于定时同步的训练序列,在接收端采用对称相关器计算接收信号相关值以确定定时位置.仿真结果表明,本算法无论是在集中式MIMO系统或是分布式MIMO系统中都能有效地进行定时同步,尤其是用于分布式系统时,新算法较传统算法能更有效地估计出天线间的延时.A time synchronization method using shift-orthogonal constant amplitude zero auto correla- tion （CAZAC） sequences constructing the time synchronization preamble is designed for multiple-input multiple-output （MIMO） orthogonal frequency division multiplexing （OFDM） systems. Owning to the unique properties of the designed synchronization preamble, the use of a symmetrical-correlator at the receivers can generate unit pulses for different transmitters to detect the time offsets of each anten- na element. The performance of the proposed is compared with traditional methods on the condition of different time offsets in simulations, it can be found that the proposed scheme will provide higher accu- racy than that caused by the distributed transmitters when detecting the different time offsets.

关 键 词：多输入多输出 正交频分复用 定时同步 恒幅零自相关码 

分 类 号：TN929.53[电子电信—通信与信息系统]