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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 the high-frequency satellite communication system, the effective rain attenuation measure is a very important research topic. According to the Rain-Failure Prediction Model of International Telecommunication Union (ITU-R) and the example of Wuhan -134 ° E satellite downlink (20GHz), this paper studies the adaptive coding modulation rain attenuation technology, The adaptive coding modulation rain attenuation system block diagram, and system performance simulation. Simulation results show that compared with the traditional QPSK modulation scheme, the system greatly reduces the outage time and significantly improves the throughput.