Spatial fading emulator — Early OTA device in Japan

The authors have investigated on the spatial fading emulator comprised of multiple antenna elements emulating the spatially distributed scatterers to generate the fading in the reproducible manner since 2001. This paper presents the history of early development until 2010 when MIMO OTA test was a very popular topic. The motivation, ideas and achievement are reviewed and summarized, because some important papers were not published in English nor on major journals nor international conferences, and such kind of review has not yet been conducted by now.