Realtime Multi-User Multi-Antenna Downlink Measurements. - Thomas Wirth; Volker Jungnickel; Andreas Forck; Sander Wahls; Holger Gäbler; Thomas Haustein; Josef Eichinger; D. Monge; Egon Schulz; Christoph Juchems; F. Luhn; R. Zavrtak (WCNC, 2008)