CAJ | 학술논문

MIMO-OFDM技术将成为4G的核心技术,但其频率同步问题是必须要解决的问题之一。传统的盲同步算法中,大多在精确度和复杂度之间很难取舍。针对LS（最小二乘）算法精确度不高的问题,提出了一种新的基于MMSE（最小均方误差）算法的频率同步方法,并与LS算法的性能进行了比较。仿真结果表明,在同样的信噪比下,MMSE算法能得到比LS算法更低的误码率和均方误差。
MIMO-OFDM기술장성위4G적핵심기술,단기빈솔동보문제시필수요해결적문제지일。전통적맹동보산법중,대다재정학도화복잡도지간흔난취사。침대LS（최소이승）산법정학도불고적문제,제출료일충신적기우MMSE（최소균방오차）산법적빈솔동보방법,병여LS산법적성능진행료비교。방진결과표명,재동양적신조비하,MMSE산법능득도비LS산법경저적오마솔화균방오차。
MIMO-OFDM system will become the core technology of the4G,but the frequency synchronization is one of the problems to be solved.In most of the traditional blind synchronization algorithms,it is difficult to make a choice between precision and complexity.In view of the low precision of LS algorithms,a new frequency synchronization method based on the MMSE(minimum mean square error) algorithm is proposed,and the comparison between its performances and that of the LS(Least Square) algorithm is also made.The simulation results show that under the same signal-to-noise ratio,the MMSE algorithm can get lower bit error rate and mean square error than the LS algorithm.