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International Journal of Antennas and Propagation
Volume 2017, Article ID 8284917, 18 pages
Research Article

Validation of the Decomposition Method for Fast MIMO Over-the-Air Measurements

1Graz University of Technology, Graz, Austria
2Austrian Institute of Technology, Vienna, Austria
3Rohde and Schwarz, Munich, Germany

Correspondence should be addressed to Bernhard Auinger; ta.zargut@regniua.drahnreb

Received 5 October 2016; Revised 26 February 2017; Accepted 6 March 2017; Published 18 April 2017

Academic Editor: Mihajlo Stefanovic

Copyright © 2017 Bernhard Auinger et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Over-the-air (OTA) throughput tests of wireless Multiple-Input Multiple-Output (MIMO) devices are an important tool for network operators and manufacturers. The user equipment (UE) is placed in an anechoic chamber and a random fading process is emulated by a base-station emulator (BSE). The antenna characteristic of the UE is taken into account by sampling the sphere around the UE with the BSE test antenna at a large number of positions. For low-variance throughput results, long measurement intervals over many fading realizations are required, leading to long and expensive measurement periods in an anechoic chamber. To speed up the OTA test, we analyze the Decomposition Method (DM). The DM splits the throughput measurement into two parts: (1) a receiver algorithm performance tests taking the fading process into account and (2) an antenna performance test without fading process emulation. Both results are combined into a single throughput estimate. The DM allows for a measurement time reduction of more than one order of magnitude. We provide an analytic and numerical analysis as well as measurements. Our detailed results show the validity of the DM in all practical settings.