CAJ | 학술논문

针对MIMO-OFDM系统对同步错误率和载波频偏特别敏感问题，本文提出了MIMO-OFDM系统训练序列构造及其同步方法。该同步方法设计的训练序列由两个结构不同的序列构成：第一个序列利用重复性构成，第二个序列利用反对称性构成，其构造训练序列中的β因子影响系统定时同步性能。在接收端，利用训练序列和本地数据信号进行互相关获取定时同步，在获取精确地定时同步后进行小数频偏估计和整数频偏估计，其整数频偏估计范围可达到1/4带宽。通过理论分析和仿真表明：本文提出的同步新方法比常规方法有更好的同步性能，并且降低了系统计算复杂度。
침대MIMO-OFDM계통대동보착오솔화재파빈편특별민감문제，본문제출료MIMO-OFDM계통훈련서렬구조급기동보방법。해동보방법설계적훈련서렬유량개결구불동적서렬구성：제일개서렬이용중복성구성，제이개서렬이용반대칭성구성，기구조훈련서렬중적β인자영향계통정시동보성능。재접수단，이용훈련서렬화본지수거신호진행호상관획취정시동보，재획취정학지정시동보후진행소수빈편고계화정수빈편고계，기정수빈편고계범위가체도1/4대관。통과이론분석화방진표명：본문제출적동보신방법비상규방법유경호적동보성능，병차강저료계통계산복잡도。
To reduce synchronization error and sensitivity to carrier frequency offset of MIMO-OFDM system ,this paper pro-poses that construction of training sequence and synchronization method for MIMO-OFDM system .The training sequences of the synchronization method consist of two sequences of different structures :the first one is repetitive and the second one is antisymmet-ric .The factor βin the training sequences affects timing synchronization performance of the system .The timing synchronization is caught At the receiver by cross-correlating the training sequence and the local signal .The fractional frequency offset and integer fre-quency offset are estimated after catching precise timing synchronization ,with the range of the integer frequency offset estimation being one-quarter of the bandwidth .Theoretical analysis and simulation show that the proposed synchronization has better synchro-nization performance than the conventional methods and reduces the computational complexity .