星地链路雨衰信道动态特性的HIL仿真

为进一步研究自适应传输、功率控制和分集等毫米波频段星地链路的抗雨衰措施,提出了一种雨衰信道硬件在环路HIL(Hardware-in-the-loop)仿真系统的原理与实现方案.讨论了U.C.Fiebig等人提出的基于时间序列发生器原理的雨衰信道动态预测模型,设计并实现了基于MATLAB/SIMULINK软件与FPGA硬件相结合的雨衰信道硬件在环路实时仿真器.在此基础上,对不同降雨衰减条件下的MPSK/MQAM自适应调制抗雨衰措施及误码率性能进行了分析和比较,HIL仿真结果与理论上的预测分析是一致的.这种HIL雨衰信道仿真器可以用于检验卫星通信系统抗雨衰措施的有效性.

Hardware-in-the-loop simulation of dynamic characteristics of rain fading channel for satellite-to-earth links

Real-t ime pr edict ion o f rain fading channel dy namic characterist ics is necessary for fading mit igatio n techniques ( FMT) o f satellite-to-earth link in millimeter wave band, such as adaptiv e t ransmission, pow er cont rol and diver sity. T he principle and implementation of a har dw are-in-the-loo p ( HIL) simulation sy stem of rain fading channel w ere intro duced. Dynamic rain fading prediction model based on the t ime-series g enerato r proposed by Fiebig w as discussed f irst ly . A HIL real-t ime simulato r of r ain fading channel s w as schemed and real ized v ia MATLAB/ SIMU LINK so ftw are and FPGA hardw are. Furthermore, the BER perfo rmance of MPSK/ MQAM adaptive modulat ion fading mit ig atio n under various rain at tenuation impairment s was evaluated. A nd HIL simulation result s ar e in accord with theoret ic predict ions. This HIL simulator o f rain fading channel can be used to test the effect iv eness of FMT in satellite communication sy stems.