波束赋形和自适应波束调节的MIMO测试关键技术研究

MIMO OTA test is of great importance for the development of mobile communication technology. MIMO test for beamforming and adaptive beam adjustment have always been a worldwide problem. Based on the radiated two-stage method, this proposal will study OTA test method of high-order MIMO systems, which includes: ① the throughput test model will be presented based on the radiated two-stage method, an equivalent numerical model of the receiver signal, channel model and antenna pattern will be studied, and the circuit simulation broadcasting methods of the calculation results of channel model and antenna pattern will be studied; ② the solution of the inverse matrix in high-order MIMO systems will be presented, which includes the decomposition of matrix in high-order MIMO systems, and the fusion of inverse matrix of subsystem; ③a throughput measurement method for beam forming in multi-antenna systems will be presented, and the model of relationship between the H matrix and the throughput will be studied, where a new method of throughput test method for beam forming will be established which requires just one test of throughput of antenna pattern; ④a throughput test method for adaptive beam adjustment will be presented, where a calculation model of throughput for the adaptive beam adjustment will be studied based on the H matrix. This proposal will solve the problem that the test can not be manipulated in the working model of beamforming and adaptive beam adjustment, which will provide a new and fast MIMO test method.

MIMO OTA测试对于移动通信技术发展具有重大意义。波束赋形和自适应波束调节的MIMO测试一直是悬而未决的世界性难题。本项目以辐射两步法为基础，研究高阶MIMO OTA测试方法，包括：①提出辐射两步法MIMO吞吐量测试模型，建立接收机信号与其所处于的物理环境、天线方向图之间的等效模型，构建信道模型与方向图运算结果的电路模拟播报方法；②提出高阶逆矩阵求解方法，建立高阶MIMO系统矩阵分解方法，研究MIMO子系统逆矩阵融合方法；③建立高阶MIMO波束赋形工作模式吞吐量的测试方法，建立H矩阵与吞吐量对应关系的数学模型，构建仅需测试一个方向图的吞吐量就可计算整个波束赋形吞吐量云图的新方法；④提出高阶MIMO自适应波束调节工作模式吞吐量的测试方法，建立基于H矩阵的自适应波束调节模式下吞吐量计算模型。本项目将解决波束赋形和自适应波束调节模式中测试不可操控性难题，为MIMO测试提供全新、快速解决方案。

辐射两步法是4G MIMO(MIMO, Multiple Input Multiple Output)标准测试方法之一，且已经在手持无线设备、汽车、物联网等领域得到了广泛的应用，一直受到国内外众多学者的关注。对于MIMO系统，波束赋形和自适应波束调节技术已经在通信系统中得到应用，但其无线性能的测试一直是工程实践中一大难题。本项目以辐射两步法为基础，针对MIMO设备无线系统场景，逐步解决了波束赋形和自适应波束调节的测试难题。.本项目的主要研究成果有：(1)对现有的空间电磁波传播2×2矩阵求逆算法进行分析和优化；(2)空间电磁波传播高阶矩阵求逆算法研究；(3)空间电磁波传播高阶矩阵求逆算法实现和验证；(4)吞吐率准确性验证工作；(5)高阶MIMO波束赋形工作模式吞吐量的测试方法；(6)高阶MIMO自适应波束调节工作模式吞吐量的测试方法；(7)新型吸波材料的研究；(8)无源互调研究；(9)新型天线与微波元器件。.本项目对波束赋形的测试、MIMO系统吞吐率测试以及高阶MIMO接收机系统测试的研究成果，可以很好地应用到无线通信设备的测试中，为工业界提供全新、快速准确的测量技术方案。