The Vienna MIMO testbed is a custom built wireless testbed that allows for repeatable and fully controllable over-the-air experiments. Thereby, the testbed is not restricted to a certain wireless communication standard. It allows for experiments with arbitrary signals with a bandwidth of up to 20 MHz.
At the receiver side, a custom built rotary unit extends the capabilities of the Vienna MIMO testbed for fully controllable wireless measurements at user velocities of up to 400 km/h. Thereby, repeatable time-variant channels are generated by rotating the receive antennas around a central pivot. A light barrier generates a trigger every time the receive antennas pass. This allows for repeated transmissions over the same time-varying channel and therefore for a fair comparison of different transmit signals at different velocities. In order to generate different channel realizations the whole setup can be moved within an area of 3 λ x 2.2 λ.
