| 摘要: |
| 多输入多输出正交频分复用（MIMO-OFDM）系统对定时偏移和频率偏差极其敏感，并且对时间同步精度要求极高。分析比较了29种具有代表性的MIMO-OFDM系统同步算法的优缺点,指出针对数据辅助类的同步方法，采用共轭、取反等特性构造优良正交性的训练序列是提高时间同步性能的关键，可在时域进行频偏估计和降低参数维数来降低系统计算复杂度；针对非数据辅助类的同步方法，构造计算复杂度较低的代价函数是提高频率同步性能的关键，这些都是MIMO-OFDM系统同步方法值得研究的方向。 |
| 关键词: MIMO-OFDM 训练序列 时间同步 频率同步 研究进展 |
| DOI： |
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| 基金项目:国家自然科学基金资助项目（61310306022）;四川省“千人计划”引进人才资金资助项目；四川省科技支撑计划资助项目（2012FZ0021）；西南石油大学油气信号检测与信息处理青年科研创新培育团队资金资助项目（2013XJZT007） |
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| Research progress on synchronization technology for MIMO-OFDM system |
| LUO Ren-ze,YANG Jiao,LI Rui,HU Shuai-nan |
| () |
| Abstract: |
| Very sensitive to timing offset and frequency offset, the Multiple Input Multiple Output (MIMO) Orthogonal Frequency Division Multiplexing (OFDM) system requires high accuracy of synchronization.This paper analyzes and compares the advantages and disadvantages of twenty-nine representative synchronization algorithms for MIMO-OFDM system. On this base, it points out that, for data-aided synchronization method, the key to improve the time synchronization performance is to construct training sequences with good orthogonality on the basis of the characteristics of conjugate anti-symmetry,and the computational complexity of system can be lowered by conducting frequency offset estimation in time domain and reducing dimension parameters;for non-data-aided synchronization method, the key to improve the frequency synchronization performance is to construct cost function with lower computational complexity.The summarized techniques for MIMO-OFDM system deserve further investigation. |
| Key words: MIMO-OFDM training sequence timing synchronization frequency synchronization research progress |
《电讯技术》编辑部 