一种自适应编码调制抗雨衰对策的研究

Study of an Adaptive Coding and Modulation as a Rain Fade Countermeasure

在高频段卫星通信系统中,有效的抗雨衰措施是一个非常重要的研究课题。本文根据国际电信联盟无线电通信部门(ITU-R)的雨衰预测模型,以武汉-134°E星下行链路(20GHz)为例,对自适应编码调制抗雨衰技术进行了研究,给出了该自适应编码调制抗雨衰系统实现框图,并对系统性能进行了仿真。仿真结果表明,与传统的QPSK调制方式相比,该系统年中断时间大大减少,吞吐量明显提高。

In high -frequency satellite communication system, effective rain fade an important research topic. This thesis investigates the adaptive coding and modulation as a rain fade countermeasure based on ITU - R forecasting model, taking example for Wuhan - 134°E satel- lite down -link （20GHZ）, and simulates the performance of the system with the system scheme of A- daptive Coding and Modulation presented as a rain fade countermeasure. Simulation results show that, compared with the traditional QPSK modulation,the system＇s interrupted time is reduced a lot and the throughput is increased obviously.