To gain more insights of MIMO OFDM, the most promising 4G air interface, we study its coherent and noncoherent system structures in multipath time-varying Rayleigh fading channels.

• 为了对这最有希望的第四代空中介面-多输入多输出正交分频分工-有更深入的了解，我们研究它在多路径时变瑞雷衰落通道的同调与非同调系统架构。