Power, Rate and Location Control for Multi-User Ultra-Wideband Communication (Multi-User UWB Communication)

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In the present project, multi-user ultra-wideband (UWB) impulse radio systems will be investigated. Typically a number of users is transmitting to a single receiver, called base station. The transmitted signal is a sequence of very short pulses of ultra-wide bandwidth. The signal-to-interference ratio of user i depends simultaneously on the transmission power, the pulse repetition time, the time hopping code and the path gains of all other users. Two different types of connections will be considered, best effort and reservation based traffic. The project will start from an analytical description of the feasible rate, and the power and capacity region for UWB radio. Their structural and geometrical properties will be revealed, opening the way to an information theory for multi-user UWB systems. Based on this, medium access control (MAC) algorithms and corresponding general resource allocation policies will be developed to achieve maximum throughput under fairness constraints, and to avoid congestion. The ultimate goal are strategies for self-adaptive allocation of resources to best effort traffic. Furthermore, distributed algorithms will be designed which require only a minimum of global information exchange. Finally, principles of position and location tracking by fitting power measurements to predicted values will be carried over from cellular systems and will be refined for UWB transmission. As a typical application, we aim at integrating relative location information into routing protocols of sensor and ad-hoc networks.