RETRACTED: Inverse Matrix Auto-Search Technique for the RTS MIMO OTA Test-Part 1: Theory (Retracted Article)

An inversematrix auto-search algorithm for radiated two-stage (RTS) multiple-input and multiple-output (MIMO) over-the-air (OTA) tests is proposed in this paper. The RTS method is one of the significant techniques for the MIMO OTA test and was provided by organizations such as the Cellular Telecommunication and Internet Association and the Third-Generation Partnership Project. An extremely important basic step in the RTS test procedure is to select an appropriate combination of measurement antennas and device-under-test orientation for inversematrix solving. The automatic resolving algorithm proposed in this paper can be divided into two parts: the technique for selecting the appropriate combinations for inversematrix solving, and the method for solving the inverse matrix at a fixed combination. The technique proposed in this paper can make the RTS test procedure automatic and fast, which greatly improves the user experience. The most mentionable advantage of the technique is that only 2 min are required for the whole process including the appropriate combination calculation and the inverse matrix solving at the selected combination, while several hours might be needed using the traversal method.