Results of the TSUNAMI field trials: position location in macro and micro cell environments

The CEC ACTS TSUNAMI (II) project involved the development, integration and field trial evaluation of a DCS1800 2/sup nd/ generation mobile base-station with an adaptive antenna. The consortium designed and built an 8 element transmit and receiving adaptive antenna system, employing digital beamforming techniques operating over a DCS1800 air interface and the performance assessed for a variety of different operational scenarios using the Orange testbed facility in Bristol. The TSUNAMI (II) field trial system included both transmit and receive calibration facilities in order to obtain adequate accuracy from the digital beamforming techniques. The ability to track users is a fundamental feature of this technology. The application of array signal processing to provide mobile location information has been assessed, using the data collected during the trials and compared with position information, obtained via a commercially available GPS receiver. This application is particularly relevant to 'hot-spot' detection in cellular networks as well as the '911' location requirement in the USA.