MIMO-OFDM系统同步方法的循环前缀结构及算法改进  

Cyclic Prefix Structure and Algorithm Improvement of Synchronization Method for MIMO-OFDM System

作　　者：宋冬梅[1] 颜彪[1] 张锐[1] 

机构地区：[1]扬州大学信息工程学院,扬州225009

出　　处：《无线通信技术》2017年第3期10-14,共5页Wireless Communication Technology

摘　　要：针对多输入多输出正交频分复用(MIMO-OFDM)系统的同步问题,提出了一种对循环前缀(Cyclic Prefix,CP)结构及算法改进的同步方法。该方法将循环前缀分为三部分,第一部分采用前一个OFDM符号的头部,二三部分采用当前OFDM符号的尾部;算法上对第二部分先进行求和取平均,再相关,对第三部分引入PN序列后再相关,最后结合二三部分推导出符号定时同步位置和频偏估计。仿真结果表明,改进的循环前缀结构和算法,在计算量减小的同时系统的同步性能也得到了相对提高。For the synchronization problem of Multiple Input Multiple Output Orthogonal Frequency Division Multiplexing（ MIMO-OFDM） system,an improved synchronization method of cyclic prefix（ CP） structure and algorithm is proposed. The CP is divided into three parts,the header of the previous OFDM symbol is copied to the first part and the tail of the current OFDM symbol is copied to the other two parts. In the algorithm,the average value of the second part is calculated before conducting its correlation calculation. In the third part,the PN sequence is added and then the correlation calculation is carried out. Finally,the symbol timing synchronization position and frequency offset estimation are derived by combining the two and three parts. The simulation results show that the improved CP structure and algorithm can improve the synchronization performance of the system while the computation is reduced.

关 键 词：MIMO-OFDM 循环前缀 PN序列 同步 

分 类 号：TN929.53[电子电信—通信与信息系统]