基于混响室的大尺寸机器对机器设备空口测试不确定度分析及混响室优化设计

Simple yet effective over-the-air (OTA) techniques can reduce development cycles and costs of wireless devices. As the rapid growth of machine-to-machine (M2M) communications, there is a strong and urgent need from the industry for OTA testing of M2M wireless devices. Compared with other OTA techniques, the reverberation chamber (RC) has large working volume, high efficiency, etc. As a result, it is more suitable for OTA testing of large-form-factor M2M wireless devices. Measurement uncertainty is one of the key issues that affect the OTA performance of the RC. The project aims at investigating the measurement uncertainty of the RC and optimizing the RC design accordingly. By combining theoretical analysis, simulations, and experimental measurements, the project will investigate the effects of various RC components (including the large-form-factor M2M device under test) on the measurement uncertainty, improve the uncertainty model of the reference measurement, and establish uncertainty models of various OTA tests. By optimizing the mode stirrers, in combination of scattering metasurface, turn-table, and multi-antenna stirring techniques, the measurement uncertainty can be reduced effectively (without sacrificing the working volume of the RC). The research results of the project will establish a theoretical foundation for RC uncertainty analysis, provide guidelines for RC optimizations, and, therefore, have theoretical and practical significant for the development of RC-based OTA testing of large-form-factor M2M devices.

简单有效的空口（无线）测试技术可缩短无线设备的研发周期，降低研发成本。随着机器对机器（M2M）无线通信的飞速发展，业界对M2M空口测试技术的需求愈发迫切。与其它空口测试技术相比，混响室有工作区域大、成本低等优点，更适合大尺寸M2M设备的空口测试。混响室的测量不确定度是影响其测试性能的关键问题之一。本项目对混响室测量不确定度及其优化设计开展研究。采用理论推导与仿真及实验测量相结合的方法，研究混响室各因素（包括大尺寸M2M待测设备）对测量不确定度的影响，完善参考测量的不确定度模型，建立空口测试的不确定度数学模型。通过优化搅拌器设计，并采用漫散射超表面、转台及多天线源搅拌等技术，在不减小混响室工作区域的前提下，有效地降低混响室的测量不确定度。本项目的研究成果将为混响室空口测试的不确定度分析提供理论依据，为混响室优化设计提供技术指导，这对大尺寸M2M设备空口测试技术的发展具有重要的理论和实用意义。

简单有效的空口测试技术可缩短无线设备的研发周期，降低研发成本。随着机器对机器（M2M）无线通信的飞速发展，业界对M2M空口测试技术的需求愈发迫切。与其它空口测试技术相比，混响室有工作区域大、成本低等优点，更适合大尺寸M2M设备的空口测试。混响室的测量不确定度是影响其测试性能的关键问题之一。本项目对混响室测量不确定度及其优化设计开展研究。采用理论推导与仿真及实验测量相结合的方法，研究了混响室各因素（包括大尺寸M2M待测设备）对测量不确定度的影响，并建立有源设备空口测试的不确定度数学模型。先后设计出了漫散射超表面和高性能搅拌器，提出了基于涡旋波的源搅拌技术，在不减小混响室工作区域的前提下，有效地降低了混响室的测量不确定度。本项目的研究成果为混响室空口测试的不确定度分析提供理论依据，为混响室优化设计提供技术指导，对大尺寸M2M设备空口测试技术的发展具有重要的理论和实用意义。