３ＧＰＰ的空间信号模型（ＭＩＭＯ）文档．主要包括ＢＳ和ＡＳ两端的波束角度（入射角和离开角），azimuth 频谱，信道相关系数定义等 -3GPP space signal model (MIMO) document. Mainly include the BS and AS at both ends of the beam angle (angle of incidence and departure angle), azimuth spectrum, channel correlation