| 用于MIMO OFDM系统的定时同步算法 |
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| 引用本文： | 张建华,冯冲,刘毅,张炎炎. 用于MIMO OFDM系统的定时同步算法[J]. 北京邮电大学学报, 2009, 32(1): 118-121 |
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| 作者姓名： | 张建华 冯冲 刘毅 张炎炎 |
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| 作者单位： | 1. 北京邮电大学,无线新技术研究所,北京,100876;泛网无线通信教育部重点实验室,北京邮电大学,,北京,100876
2. 北京邮电大学,无线新技术研究所,北京,100876 |
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| 基金项目： | 国家自然科学基金，国家高技术研究发展计划(863计划) |
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| 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系统中都能有效的进行定时同步，尤其用于分布式系统时，新算法能更有效的估计出天线间的延时。
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| 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 |
Time Synchronization Algorithm for MIMO OFDM Systems |
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| ZHANG Jian-hua,FENG Chong,LIU Yi,ZHANG Yan-yan. Time Synchronization Algorithm for MIMO OFDM Systems[J]. Journal of Beijing University of Posts and Telecommunications, 2009, 32(1): 118-121 |
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| Authors: | ZHANG Jian-hua FENG Chong LIU Yi ZHANG Yan-yan |
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| Affiliation: | ZHANG Jian-hua, FENG Chong, LIU Yi, ZHANG Yan-yan |
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| Abstract: | A time synchronization method using shift-orthogonal Constant Amplitude Zero Auto Correlation (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 antenna 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 accuracy than that caused by the distributed transmitters when detecting the different time offsets. |
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| Keywords: | multiple-input multiple-output orthogonal frequency division multiplexing time synchronization constant amplitude zero auto correlation |
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