On January 20, 2010 the European Patent Office granted to CTTC the European Patent No. 2039019:

"METHOD AND SYSTEM FOR ROBUSTLY TRANSMITTING THE MINIMUM POWER IN MULTI-USER AND MULTI-ANTENNA COMMUNICATIONS SYSTEMS WITH IMPERFECT CHANNEL KNOWLEDGE".

The patent presents a method and system for robustly transmitting the minimum power from a transmitter of a base station to the mobile users attached to the base station, while guaranteeing a certain quality of service per user. Minimizing the total transmitted power has multiple advantages. Apart from the fact of lowering the energetic resources consumption, there is less electromagnetic radiation in the environment and the total system interference level is minimized.  Previous designs of minimum power linear transmission architectures assume that both the transmitter (at the base station) and the user receivers (mobile terminals) have perfect knowledge of the channel state information. However, in a practical scenario, this assumption is not realistic, mainly for wireless systems where the fluctuations of the channel can be fast. The presented design is robust to the uncertainty in the channel estimate. The authors of this invention are Dr. M. Payaró, Dr. A. Pascual and Dr. M. A. Lagunas, director of the centre.