| MIMO-OFDM系统中的时频同步 |
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| 引用本文： | 郭漪,刘刚,葛建华,丁海洋.MIMO-OFDM系统中的时频同步[J].华中科技大学学报(自然科学版),2011(8):76-79. |
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| 作者姓名： | 郭漪 刘刚 葛建华 丁海洋 |
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| 作者单位： | 西安电子科技大学ISN国家重点实验室; |
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| 基金项目： | 国家自然科学基金资助项目(61001128); 高等学校学科创新引智计划资助项目(B08038); 长江学者和创新团队发展计划资助项目(IRT0852); 中央高校基本科研业务费专项资金资助项目(JY10000901012,JY10000901016); 西安电子科技大学ISN国家重点实验室自主研究课题创新人才基金资助项目(ISN1003004); 陕西省自然科学基础研究计划资助项目(2010JQ8012) |
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| 摘 要： | 从时频联合设计的角度出发,提出了一种多输入多输出-正交频分复用(MIMO-OFDM)训练序列及相应的时频同步方案.首先利用提出训练序列的时域共轭对称性完成定时同步,然后利用训练序列良好的频域自相关性完成频率同步.该方案不仅具有更高的定时和频率偏移估计精度,而且频偏估计范围更大,理论上可以达到(-N/2,N/2).仿真结果表明:在多径信道下,该方案符号定时偏移估计精度更高,在小信噪比下尤为显著;当频偏估计性能在均方误差为1×10-4时,提高大约3 dB.
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| 关 键 词： | 多输入多输出-正交频分复用 训练序列 定时同步 频率同步 共轭对称 均方误差 |
Time-frequency synchronization in MIMO-OFDM systems |
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| Guo Yi Liu Gang Ge Jianhua Ding Haiyang.Time-frequency synchronization in MIMO-OFDM systems[J].JOURNAL OF HUAZHONG UNIVERSITY OF SCIENCE AND TECHNOLOGY.NATURE SCIENCE,2011(8):76-79. |
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| Authors: | Guo Yi Liu Gang Ge Jianhua Ding Haiyang |
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| Institution: | Guo Yi Liu Gang Ge Jianhua Ding Haiyang(State Key Laboratory of Integrated Service Networks,Xidian University,Xi′an 710071,China) |
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| Abstract: | Time-frequency synchronization scheme for multi-input multi-output orthogonal frequency-division multiplexing(MIMO-OFDM) systems was proposed.The time synchronization was accomplished by the symmetric conjugate of the training symbol in time domain and the frequency synchronization was finished by the good autocorrelation of the training symbol in frequency domain.Compared with the conventional schemes,the scheme proposed gives very accurate estimates of symbol timing and carrier frequency offset and provid... |
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| Keywords: | multi-input multi-output orthogonal frequency-division multiplexing(MIMO-OFDM) training symbols time synchronization frequency synchronization symmetric conjugate mean square error(MSE) |
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