CAJ | 학술논문

多输入多输出正交频分复用( MIMO-OFDM)系统对定时偏移和频率偏差极其敏感，并且对时间同步精度要求极高。分析比较了29种具有代表性的MIMO-OFDM系统同步算法的优缺点，指出针对数据辅助类的同步方法，采用共轭、取反等特性构造优良正交性的训练序列是提高时间同步性能的关键，可在时域进行频偏估计和降低参数维数来降低系统计算复杂度；针对非数据辅助类的同步方法，构造计算复杂度较低的代价函数是提高频率同步性能的关键，这些都是MIMO-OFDM系统同步方法值得研究的方向。
다수입다수출정교빈분복용( MIMO-OFDM)계통대정시편이화빈솔편차겁기민감，병차대시간동보정도요구겁고。분석비교료29충구유대표성적MIMO-OFDM계통동보산법적우결점，지출침대수거보조류적동보방법，채용공액、취반등특성구조우량정교성적훈련서렬시제고시간동보성능적관건，가재시역진행빈편고계화강저삼수유수래강저계통계산복잡도；침대비수거보조류적동보방법，구조계산복잡도교저적대개함수시제고빈솔동보성능적관건，저사도시MIMO-OFDM계통동보방법치득연구적방향。
Very sensitive to timing offset and frequency offset, the Multiple Input Multiple Output ( MIMO) Orthogonal Frequency Division Multiplexing ( OFDM) system requires high accuracy of synchronization. This paper analyzes and compares the advantages and disadvantages of twenty-nine representative synchro-nization algorithms for MIMO-OFDM system. On this base, it points out that, for data-aided synchroniza-tion method, the key to improve the time synchronization performance is to construct training sequences with good orthogonality on the basis of the characteristics of conjugate anti-symmetry,and the computation-al complexity of system can be lowered by conducting frequency offset estimation in time domain and reduc-ing dimension parameters;for non-data-aided synchronization method, the key to improve the frequency synchronization performance is to construct cost function with lower computational complexity. The summa-rized techniques for MIMO-OFDM system deserve further investigation.