多天线Rice信道空间衰落相关的近似表达
doi: 10.3724/SP.J.1146.2005.00911
An Approximate Expression for Spatial Fading Correlation in Multi-antenna Rice Channels
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摘要: 将von Mises分布作为多径散射接收信号的功率密度分布，在存在稳定直射分量的条件下，推导出相应的多天线Rice信道中的多径角度扩展公式，进而推导出了小尺度Rice衰落信道中紧凑阵元空间相关系数的近似表达式。von Mises分布的集中度参量对多径角度扩展的影响较Rice因子更为明显。只要多径散射是各向同性的，阵元间的空间相关性较弱；只要多径散射是各向异性的，空间相关性将随直射分量功率增大而急剧增加。分析表明，角度扩展和阵元间距是影响接收信号空间衰落相关性的主要因素。Abstract: Considering the von Mises distribution as the received multipath power density distribution versus the AOA of scatter components, a formula for multipath angular spread corresponding to this distribution is presented in multi-antenna Rice channels, and an approximate expression for spatial correlation coefficient between compact antenna elements is proposed in small-scale Rice fading channels. The von Mises distributions concentration parameter makes a more visible impact on multipath angular spread than the Rice factor. It is concluded that spatial correlation between elements is weaker as long as multipath scattering is isotropic. It is also concluded that so far as multipath scattering is nonisotropic, the spatial correlation will acutely rises along with increasing of LOS power. The resulting analysis indicates that the angular spread and spacing between elements are main factors effecting on spatial fading correlation of received signals.
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