Notice of Retraction: Inverse Matrix Auto-Search Technique for the RTS MIMO OTA Test—Part II: Validations

Abstract

Uncertainty analysis for the multi-input multi-output (MIMO) over-the-air (OTA) measurement is very important for the test standardizations. As one of the only two standard MIMO OTA test methods, the radiated two-stage (RTS) method is known for its simple test setup and cost-effective solution. The RTS measurement uncertainties have been researched and discussed. Especially the inverse matrix auto-search uncertainty is discussed and validated in this paper. The RTS method is based on three steps: the antenna pattern measurement, the inverse matrix solving, and the throughput test. With the inverse matrix applied, the throughput test could be conducted OTA or called virtual cables. However, the isolation of the virtual cable may cause great desensitization. This paper details the RTS MIMO OTA measurement uncertainties caused by the isolation. That is helpful for avoiding or reducing the test errors as much as possible in the process of RTS implementations.