卫星通信系统中功率与时隙资源联合分配算法

提出联合优化卫星通信系统中的功率和时隙资源的方法,以提高星上有限资源的使用能效。挖掘了功率和时隙资源在容量提升上的相互补充相互依存关系,考虑了多个地球站的信道条件和容量需求的差异性,建立了资源联合分配的状态组合模型,以适应各地球站的多资源利用模式。并以最大化能效为目标,设计了联合分配的迭代对偶优化（IDO）算法,以较低复杂度获得了最优联合分配方案。仿真分析表明,资源联合优化比非联合优化提高了能量利用效率,尤其在频率资源（载波数目）较少时优势更加明显。     

MIMO波束形成通信系统有效容量分析简

Effective capacity describes the rate upper bound of the communication system under the quality of service(QoS) limitation. While the foregoing performance analysis focuses mainly on the single input single output and multiple input single output systems, this paper considers the effective capacity of the multiple input multiple output(MIMO) beamforming scheme. Given that the modulation(M-QAM or M-PSK) is restricted, we investigate the representative transmission scheme of MIMO beamforming: maximal ratio combining transmission, for which the closed-form formula of effective capacity is derived. Simulation results not only demonstrate the effectiveness of our performance analysis, but also show the relationship between effective capacity and average signal-to-noise ratio as well as the relationship between effective capacity and QoS parameter for various antenna configurations.     

基于稳态化的卫星网络低时延路由策略

卫星网络动态拓扑被建模成在空间上延展、时间上连续的稳态图模型—时空连接图(Space-Time Connection Graph,STCG),且权重为数据在STCG的空间数据链路和虚拟时间链路的传输时延.通过对传统静态路由算法进行改进,使其可以应用到STCG中为卫星网络制定传输时延最短的路由;仿真结果表明,该路由策略可...