多点协作模式下参数化电磁散射簇的室内信道数值建模

Coordinated Multipoint transmission (CoMP) is an emerging technology aiming to enhance the throughput and reliability at the edges of the cells by cooperating the wireless resource of the base stations. It is one of the key technologies of 5G communication. The core of the CoMP relies on an accurate channel model of Distributed Multiple Input Multiple Output (D-MIMO). However, the modeling of 5G indoor CoMP channel with the traditional experimental method is difficult because of the complexity of the indoor scattering in 3GHz-6GHz frequency range and the influences of moving human body. This proposal solves the multi-scale scattering problem by a hybrid simulating technique that combines the Geometric Ray Tracing and the Finite Difference Time Domain. The intrinsic correlations of electromagnetic multipath propagation and of the distribution of indoor scattering clusters will be analyzed and the physical characteristics of indoor scattering circumstances will be investigated. The effect of the movement of human body will be considered through the disturbing moving clusters. A unified model of indoor D-MIMO channels will be established as the superposition of static channels and disturbing channels and parameterized. The purpose of the proposal is to reveal the mechanism behind the complex phenomena of the indoor D-MIMO by numerical simulation, to develop a unified indoor channel model, and to promote the application of CoMP in indoor mobile internet and internet of things.

多点协作通信是通过协调终端附近多个基站的无线资源，提高小区边缘吞吐量和可靠性的无线通信技术，也是5G通信的关键技术之一。该系统的核心依赖于高精度的分布式多入多出信道模型。由于室内环境下5G所在3GHz-6GHz频段的散射复杂，加之人体移动对散射特性有很大影响，传统的实验方法难以给出统一的室内多点协作信道模型。本项目拟采用几何射线和时域有限差分混合数值仿真方法处理多尺度散射问题，通过分析电磁波多径相关性与室内典型散射体簇状分布相关性之间的内在联系，研究典型室内散射环境的物理特征，并将人体移动对电磁传播的影响概化为移动散射体簇对静止散射体簇的扰动，进而以散射体簇量化参数的形式，建立静态信道上附加扰动信道的室内分布式多入多出信道模型。本项目旨在通过数值仿真方法，揭示室内多点协作信道复杂现象背后的机理，建立统一的信道模型，最终促进该技术在室内移动互联网、物联网等领域中的应用。

由于室内环境下的散射复杂，加之人体对散射特性有很大影响，传统的实验方法难以给出统一的室内信道模型。本项目研究了用于信道物理传播仿真的电磁仿真计算方法，改善统计试验方法严重依赖试验场景的缺陷，从物理过程上分析传播及其信道特征，提出完善统一的物理信道模型；针对室内信道出现的簇状结构，分析信道簇状信道的形态，根据物理传播过程对信道簇状形态成因初步给出合理的物理解释；分析人体对电磁传播的作用，通过是电磁波在人体表面绕射的传播机理，得出人体传播对室内信道的影响。通过揭示上述室内信道复杂现象背后的机理，为信道估计、编码等具体通信技术提供理论支持，促进该技术在室内移动互联网、物联网等领域中的应用。上述工作的核心是将电磁仿真方法用于室内簇状聚集的信道及人体散射的分析，揭示了室内信道电磁传播的物理原理。该项工作除具有重要的理论意义外，由于可以充分分析室内信道形态，也具有十分重要的实用价值。