论文部分内容阅读
为了研究地空3D-Massive MIMO系统信道特性,提出一种基于三维单跳同心圆环散射体的地空3D-Massive MIMO信道模型。相比传统地空3D MIMO信道模型有两方面改进,首先是建立了基于单跳圆环散射体3D几何精确位置关系的球面波天线阵元相位偏移模型,其次采用生灭过程对Massive MIMO阵列上的非平稳特性进行建模。推导了该模型的信道统计特征函数,通过对特征函数理论推导值与蒙特卡洛统计值进行仿真对比,验证了理论推导正确性。此外,对所提信道模型与基于平面波的传统地空3D MIMO信道模型的空间相关性进行了分析及仿真对比,结果表明:在远场环境下,两者基本一致;在近场环境下,传统平面波模型不再适用,两者存在差异。最后,对若干组表征信道特征的仿真结果与公开文献中地空信道实际测试数据进行对比分析。表明本模型作为普遍适用性模型,可以根据信道的测试条件、测试环境和测试结果来优化参数配置以趋近于实际信道,以对特定信道进行精确建模。
In order to study the channel characteristics of the terrestrial 3D-Massive MIMO system, an air-ground 3D-Massive MIMO channel model based on 3D one-hop concentric circular ring scatterers is proposed. Compared with the traditional ground-based 3D MIMO channel model, there are two improvements. First, the phase-shift model of the spherical wave antenna array element based on the 3D geometric exact position relationship of the single-ring circular scatterer is established. Secondly, On the non-stationary characteristics of modeling. The channel statistical characteristic function of the model is deduced. The correctness of the theoretical derivation is verified by simulating the derivation of the characteristic function theory and Monte Carlo statistics. In addition, the spatial correlation between the proposed channel model and the traditional ground-based 3D MIMO channel model based on the plane wave is analyzed and compared. The results show that: in the far-field environment, the two are basically the same; in the near-field environment, the traditional Plane wave model is no longer applicable, there are differences between the two. Finally, the simulation results of several groups of channel characteristics are compared with the actual test data of ground-air channel in open literature. This model is shown as a general applicability model, which can optimize the parameter configuration to approach the actual channel according to the channel test conditions, test environment and test results to accurately model a specific channel.