角度域任意功率谱MIMO信道特征计算

针对任意散射环境信道,文中提出基于角度域任意功率谱PDF的基函数采样近似拟合算法,并以小角度扩展拟合等效大角度域扩展,计算并导出各种拟合以及实测数据情况下的无线信道衰落相关性(Spatial Fading Correlation,SFC)特征,重建了MIMO多输入多输出系统的信道参数模型。首先,研究小角度扩展功率谱PDF在Sinc分布、高斯分布以及拉普拉斯分布下的SFC闭合表达式,以基于任意角度域采样拟合方法来简化近似评估模型;然后,以常见的信道Von Mises分布数据为参考,拟合获取其在角度域下MIMO多天线SFC近似简化解;最后,通过计算和仿真实验得出近似计算法在特定条件下具有很好的拟合度,详细讨论了大角度扩展模型中的基函数采样数目和加权系数的选取依据及其拟合精度。结果表明,文中所提计算方法可准确地拟合对MIMO多天线系统分析时的适用性和计算效率,能降低理论计算的复杂性,可满足实际信道建模及Massive MIMO阵列设计的精度需求,且可提高性能和计算效率。

MIMO Channels with Arbitrary AoA Power Spectrum for Various Wireless Environments

For wireless environments,this paper proposes an approximate algorithm for the arbitrary AoA power spectrum,which is to expand for the large-angle AoA PDF with small angles approximation,calculates and derives the fading correlation of wireless channel in the case of various fittings and measured data,then reconstructs the channel model of the MIMO for special environments,by using spatial fading correlation(SFC).Firstly,it investigates in depth the approximate algorithm and its complexity in SFC of multi-antenna arrays with small AoA angles under Gaussian and Laplace distributions,which are capable of Macrocell and Microcell.Secondly,the common channel Von Mises distribution data are used as a reference to obtain their MIMO multi-antenna SFC approximation simplifications in the angular domain.The calculation and simulation experiments show that the approximate method has a good fitting under certain conditions.The selection of the number of samples and the weighting coefficient in the large-angle expansion model and its fitting accuracy are discussed in detail.Furthermore,a method is used to quantify the applicability and calculation efficiency while analyzing the massive MIMO antenna array.Therefore,the proposed method has a good approximation,and can greatly reduce computational complexity.