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

在本项目中，将研究多用户超宽带（UWB）脉冲无线电系统。通常情况下，许多用户向一个称为基站的接收器发送信号。传输的信号是一串超宽带宽的极短脉冲。用户i的信干扰比同时取决于所有其他用户的发射功率、脉冲重复时间、跳时码和路径增益。将考虑两种不同类型的连接，最佳努力和基于预订的流量。该项目将从对UWB无线电的可行速率、功率和容量区域的分析描述开始。它们的结构和几何特性将被揭示，为多用户超宽带系统的信息理论开辟道路。在此基础上，将开发介质访问控制（MAC）算法和相应的通用资源分配策略，以在公平性约束下实现最大吞吐量，并避免拥塞。最终目标是实现资源的自适应分配策略。此外，分布式算法将被设计为只需要最小的全局信息交换。最后，通过将功率测量值拟合到预测值来进行位置和位置跟踪的原理将从蜂窝系统继承下来，并将针对超宽带传输进行改进。作为一个典型的应用，我们的目标是将相对位置信息集成到传感器和自组织网络的路由协议中。

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.