Resource Management Optimization for Interference-Limited Multi-User Satellite Networks (ROIMUS)

干扰受限多用户卫星网络 (ROIMUS) 的资源管理优化

• 批准号: 141784927
• 负责人: Dr.-Ing. Michael Joham
• 金额: --
• 依托单位: Institut für Kommunikation und Navigation
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2009
• 资助国家: 德国
• 起止时间: 2008-12-31 至 2014-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/141784927?language=en
• 关键词: Resource; Management; Optimization; Interference; Limited

Future satellite communications have two major properties. First, the number of feeds, i.e., the number of antenna elements, at the satellite are in the order of several hundreds. Additionally, transmission is possible in time slots on a large number of carriers. Second, static and mobile users must be served, whose channels have the properties of a line-of-sight connection, i.e., the channel covariance matrices are rank one.For such satellite systems, the joint design of beamforming and user scheduling is considered that is able to deal with static and mobile users based on a robust problem formulation. Globally optimal solutions are derived based on a dual decomposition approach and monotonicity properties of the objective. Due to the large dimensions, i.e., many antennas, carriers, and users, heuristics must be employed to find low-complexity solutions. On the other hand, the large dimensionality of the problem allows for a large system analysis.Besides the adaptive beamforming and the state-of-the-art fixed beamforming with scheduling, a discretely adaptive beamforming scheme is investigated where the ground station can choose over a set of discrete beamforming patterns. Moreover, the case of a satellite cluster is considered besides the conventional single satellite setup. The additional difficulties of the design for a satellite cluster, where the users are served by several satellites, are the separate power constraints and the structural constraints of the beamformer. Additionally, different cooperation levels of the ground stations controlling the satellites are investigated.

未来的卫星通信有两大特点。首先，卫星的馈电数量，即天线单元的数量约为数百个。此外，在大量载波上的时隙中传输是可能的。其次，对于具有视距连接特性的静态用户和移动用户，即信道协方差矩阵是一阶的，基于稳健的问题描述，考虑了波束形成和用户调度的联合设计。基于对偶分解方法和目标的单调性，得到了全局最优解。由于多天线、多载波、多用户的规模较大，因此必须采用启发式算法来寻找低复杂度的解决方案。除了自适应波束形成和最先进的固定波束形成与调度外，还研究了一种离散自适应波束形成方案，地面站可以从一组离散波束形成模式中进行选择。此外，除了传统的单星设置外，还考虑了卫星群的情况。对于由多颗卫星为用户提供服务的卫星群，设计的额外困难是独立的功率约束和波束形成器的结构约束。此外，还对控制卫星的地面站的不同协作级别进行了研究。