分布式MIMO-OFDM系统中的时频同步  

Time and frequency synchronization scheme for distributed MIMO-OFDM systems

作　　者：郭漪[1] 刘刚[1] 葛建华[1] 丁海洋[1] 

机构地区：[1]西安电子科技大学ISN国家重点实验室,陕西西安710071

出　　处：《系统工程与电子技术》2011年第7期1623-1626,共4页Systems Engineering and Electronics

基　　金：国家自然科学基金(61001128);ISN国家重点实验室自主研究课题创新人才基金(JYISN1003004);高等学校学科创新引智计划(B08038);中央高校基本科研业务费专项资金(JY10000901012;JY10000901016);陕西省自然科学基础研究计划(2010JQ8012);长江学者和创新团队发展计划(IRT0852)资助课题

摘　　要：针对分布式多输入多输出-正交频分复用系统,提出一种新的训练序列及时频同步方案。在定时同步方面,它首先利用训练序列的时域共轭对称性完成粗定时同步,在此基础上进一步通过接收信号与本地时域训练序列移动相关完成细定时同步;在频率同步方面,它首先在时域利用接收信号相位差估计小数倍频偏,然后在频域利用训练序列良好的自相关性估计整数倍频偏。该方案不仅能够同时估计出各收发天线对之间的定时偏移和频率偏移,而且估计性能良好。A new preamble structure is proposed,and the corresponding time and frequency synchronization algorithms are also presented for distributed multiple input multiple output orthogonal frequency division multiplexing（MIMO-OFDM） systems.The coarse timing synchronization is accomplished by using the symmetric conjugate of the training symbol and the fine timing synchronization is accomplished by moving correlation.The fractional frequency offset is estimated by using the phase difference of the received signal,and the integral frequency offset is estimated by utilizing the good autocorrelation of the training symbol in frequency domain.The proposed preamble structure and synchronization algorithms have a satisfactory performance in distributed MIMO-OFDM systems.

关 键 词：分布式多输入多输出 正交频分复用 定时同步 频率同步 训练序列 

分 类 号：TN913[电子电信—通信与信息系统]