信息通信技术与政策

信息通信技术与政策

信息通信技术与政策 ›› 2020, Vol. 46 ›› Issue (4): 60-65.

所属专题: 5G

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5G 毫米波OTA 系统不确定度评估

Uncertainty evaluation of 5G millimeter wave OTA system

  

  1. 罗德与施瓦茨(中国)科技有限公司,北京 100012Rohde & Schwarz China, Beijing 100012, China
  • 出版日期:2020-04-15 发布日期:2020-11-10
  • 作者简介:
    谷思佳:罗德与施瓦茨(中国)科技有限公司应用工程师,博士,主要负责OTA 及天线测试系统的技术应用以及市场推广工作

  • Online:2020-04-15 Published:2020-11-10

摘要: 5G 毫米波频段有许多应用场景。毫米波采用了波束赋形技术,需要基于天线阵列实现。由于毫米波射频前端高度集成,一般不具备射频测试接口,几乎所有的测试项目需要在空口( Over-The-Air,OTA)环境下进行,因此一个可靠、稳定的测试环境是保证测试结果准确的必要条件。然而,OTA 系统是由暗室、射频线缆、转台等多个部分组成的复杂测量环境,每一个环节都可能引入相应的测量不确定度,并且传递到最终的测量结果上。此外,毫米波测量具有频率高、损耗大的特点,相对低频更难保证测量系统的可靠性,因此对毫米波OTA 系统不确定度的研究具有重要意义。结合典型的5G 毫米波OTA测量环境对系统不确定度进行阐述与分析。

关键词: 5G, 毫米波, 空口, 不确定度

Abstract: There are many application scenarios for the 5G millimeter wave band. The millimeter wave uses beamforming technology and needs to be implemented based on the antenna array. As the millimeter-wave RF front-end is highly integrated and generally does not have an RF test interface, almost all test cases have to be performed in an OTA(Over-the-Air) environment. Therefore, a reliable and stable test environment is a necessary condition to ensure accurate test results. However, the OTA system is a complex measurement environment composed of multiple parts such as an anechoic chamber, radio frequency cables, a positioner etc. Each part may introduce the corresponding measurement uncertainty and be transferred to the final measurement results. In addition, millimeter-wave measurement has the characteristics of high frequency and high loss, and it is more difficult to ensure the reliability of the measurement comparing system at relatively low frequencies. Therefore, the study of the uncertainty of millimeter-wave OTA systems is of great significance. This article describes and analyzes the uncertainty of the millimeter wave OTA system, and illustrates it with a typical 5G millimeter wave OTA measurement environment.

Key words: 5G, millimeter wave, OTA(Over-the-Air), uncertainty