A 3D Non-Stationary Wideband Massive MIMO Channel Model Based on Ray-Level Evolution
A 3D Non-Stationary Wideband Massive MIMO Channel Model Based on Ray-Level Evolution
复制标题
基于射线级演化的3D非平稳宽带大规模MIMO信道模型
DOI：
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发表时间：
2021
影响因子：
8.3
通讯作者：
Y. Zheng
中科院分区：
文献类型：
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作者：
Carlos F. López;Chengxiang Wang;Y. Zheng
提出了一种新的时空非平稳三维（3D）宽带海量多输入多输出（MIMO）信道模型。然后，我们提出了一个射线水平过程来模拟单个多径分量（MPCs）的时空演化，包括近场效应和（消失）出现，以及簇级大尺度衰落。所提出的进化过程可以在空间和时间域上灵活地控制射线的寿命和外观的平滑性。此外，我们提出了一种改进的瑞利距离准则来确定每个星团和射线的最合适波前。现有模型可以很容易地实现所提出的准则，并更有效地利用计算资源。此外，在考虑移动基站多个位置的情况下，引入了混合分布模型来模拟集群数量的分布。推导了通道的自相关函数（ACF）、多普勒功率谱密度（PSD）、空间互相关函数（S-CCF）和频率相关函数（FCF）等关键统计特性，并分析了射线水平演化过程对其的影响。通过数值和仿真结果验证了所得统计性质的正确性。
In this paper, a novel space-time non-stationary three-dimensional (3D) wideband massive multiple-input multiple-output (MIMO) channel model is proposed. We then propose a ray-level process to model the spatial-temporal evolution of individual multipath components (MPCs), including near-field effects and (dis)appearance, and cluster-level large-scale fading. The proposed evolution process can flexibly control rays’ lifespans and smoothness of (dis)appearance in both space and time domains. In addition, we propose an improved Rayleigh-distance criterion to determine the most adequate wavefront for each cluster and ray. Existing models can easily implement the proposed criterion and make a more efficient use of computation resources. Also, a Gamma-Poisson mixture distribution is introduced to model the distribution of the number of clusters when multiple locations of the mobile station are considered. Key statistical properties of the channel, including the autocorrelation function (ACF), Doppler power spectral density (PSD), spatial cross-correlation function (S-CCF), and frequency correlation function (FCF), are derived and the impact of the ray-level evolution process on them is analyzed. We demonstrate the correctness of the derived statistical properties through numerical and simulation results.