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by Terje Tjelta
EMBRACE
"Efficient Millimetre Broadband Radio Access for Convergence and Evolution"
EMBRACE is one of the European Commission IST projects. Ten partners and one sub-contractor from 6 countries accross Europe participate.
The main goal is to develop a low cost radio access system for the mass market. This will be achieved through efficient utilisation of radio frequency bands and optimisation of transmission capacities for a variety of users and usage. A prototype will be developed using MPEG-2 in the downlink and an uplink using multiple frequency time division multiple access. Time division duplex will be studied as an alternative to the frequency division duplex, realised in the hardware prototype. Star and mesh network allowing for network capacity growth as business grows, will be studied. The access network shall inter-operate and multiplex effectively with other common networks. Solutions allowing for nomadic users and route diversity (switching between two or more base stations) will be developed. Planning tools that take into account obstruction from the topography and man-made structures, the effects of atmospheric propagation conditions and the antenna radiation patterns, will be developed.
The project is based on the ACTS programme, particularly the ACTS Project AC215 CRABS, which identified a need for improvement of return link in the access systems and coverage.