基于空心半球体统计信道模型的AOA&TOA研究

AOA&TOA Statistics for 3-D Hollow-Hemispheroid Model Around Mobile Station

针对某些特殊的微小区移动通信环境,比如空旷的广场或者大型购物商厦等,移动台(Mobile station,MS)周围散射体可能很少,甚至于为零,在已有模型基础上建立了一种新的3-D空间模型——空心半球体空间模型。散射体均匀分布在移动台附近空间内,而基站(Base station,BS)的位置在离地面有一定的高度。在水平平面和垂直平面内分别推导出来波信号的到达角度(Angle of arrival,AOA)的概率密度函数表达式,另外也研究了信号到达时间(Time of arrival,TOA)的概率密度函数。估计结果与某些2-D和3-D模型对比,表明本模型的信道参数估计符合以往的理论,对空间统计信道模型的研究和应用提供了有效的支持与拓展。

A generalized three-dimensional （3-D） geometric model is proposed with the 3-D scattering hol- low-hemispheroid at the mobile station （MS） considering macrocellular mobile systems such as crowded square and large shopping malls. Closed-form expressions for joint and marginal probability density func- tions （PDFs） of the angle of arrival （AOA） seen at the MS and base station （BS） in the azimuth plane and elevation plane are derived respectively. Moreover, closed-form expressions for propagation path de- lays and trivariate joint PDFs of the time of arrival （TOA） seen at the MS are investigated. The observed theoretical results are compared with some presented 2-D and 3-D scattering models to validate the gener- alization of the proposed model. The proposed theoretical results provide effective support and develop- ment for a practical 3-D scattering environment.