阴影衰落信道下多波束卫星移动通信系统的动态信道分配策略  

A Dynamic Channel Assignment Scheme of Multi-beam Satellite Mobile Communication System in Shadowed Fading Channel

作　　者：李航[1] 赵明[2] 王京[1] 

机构地区：[1]清华大学电子工程系,北京100084 [2]清华大学信息技术研究院,北京100084

出　　处：《电讯技术》2016年第6期618-623,共6页Telecommunication Engineering

基　　金：国家高技术研究发展计划(863计划)项目(2012AA01A502);国家科技重大专项(2013ZX03006001-005)~~

摘　　要：针对已有动态信道分配策略在阴影衰落环境中性能损失较大的问题,对卫星移动通信系统的阴影衰落信道模型进行分析,提出了一种动态信道分配策略。该策略结合用户的运动状态,通过在用户的预测运动轨迹上选取抽样点,将这些抽样点的平均干扰作为信道分配的指标,并采用链路质量约束避免了流量较大时的性能恶化。仿真结果表明提出的动态信道策略可在不增大阻塞率的前提下,在中低流量时将用户平均信噪比提高约0.5 d B。该策略可以应用于阴影衰落信道下的地面移动卫星通信系统,以提高用户的平均链路性能。The performance of existing dynamic channel assignment schemes is significantly degraded in shadowed fading environment. To solve the problem,the shadowed fading channel model of satellite mobile communication system is analyzed,and a new dynamic channel assignment scheme is proposed. In the pro-posed scheme, the channel is assigned according to the average interference of the sampling positions, which are chosen by predicting user’ s trajectory. Link quality restrict is also applied to avoid performance degradation in case of heavy traffic. Simulation results show that the users’ average signal-to-noise ratio (SNR) is improved by about 0. 5 dB in case of low and medium traffic,while the blocking rate is not in-creased. The proposed scheme can be adopted in land mobile satellite communication system in shadowed fading channel,in order to improve the average link performance for users.

关 键 词：卫星移动通信 阴影衰落信道 动态信道分配 信道模型 链路质量约束 

分 类 号：TN927[电子电信—通信与信息系统]