The Berlin LTE-Advanced Testbed has been set up in a typical European metropolitan deployment in the center of Berlin. It serves for the early evaluation of LTE-Advanced concepts in a realistic cellular environment and for the demonstration of key technology features to increase spectral efficiency, range, throughput and quality-of-service.
The testbed is operated from three sites located at Fraunhofer HHI, Deutsche Telekom Laboratories and University of Technology Berlin.
LTE transmission is based on a combination of OFDM and multi-antenna techniques which are also referred to as MIMO (Multiple-Input Multiple-Output). The base system with orthogonal frequency-division multiple access (OFDMA) in the downlink and single-carrier (SC) FDMA in the uplink was successfully presented to the general public by Nokia Siemens Networks at ITU Telecom World 2006. The system was extended by link adaptation algorithms and presented at the 3GSM World Congress 2007 in Barcelona. With this system, a real outdoor urban field trial with multiple users has been made, where the base station was located at the top of the HHI building and cars with LTE terminals demonstrating a coverage of several km from a single base station.
This work was supported in part by the Federal Ministry of Educational and Research (BMBF) in the project EASY-C.
Live demonstration "Berlin LTE-Advanced Testbed" was at ICC 2009, June 14-18, Dresden, Germany