文章以2×2多输入多输出正交频分复用(MIMO-OFDM)系统的信道估计技术为研究对象,分析了该系统中结合空时编码的判决反馈信道估计方法和二维导频辅助MMSE信道估计方法,并通过仿真比较其性能。结果表明,对于慢衰落信道,可采用判决反馈方法进行信道估计,而对于快衰落时变信道,宜采用二维导频辅助MMSE方法进行信道估计,但要付出频率利用率下降的代价。 In this paper, the channel estimation technology of 2 × 2 MIMO-OFDM system is taken as the research object, the decision feedback channel estimation method combined with space-time coding and the two-dimensional pilot-aided MMSE channel estimation method, and compare its performance through simulation. The results show that for slow fading channels, the channel estimation can be performed by decision feedback method. For fast fading time-varying channels, two-dimensional pilot-assisted MMSE method should be used for channel estimation, but the cost of frequency utilization should be reduced.