Ka频段卫星通信系统雨衰混合补偿算法

为减少降雨衰减对Ka频段卫星通信系统的影响, 以降低误码率, 提出了一种混合补偿雨衰算法。该算法将基于一步线性前向预测原理的自适应功率控制方法结合速率分集技术, 由n时刻前的雨衰值预测n时刻的雨衰值, 进而调整功率, 并在功率控制达到极限时能根据信噪比动态地降低信息速率, 以获得较低的误码率。仿真结果表明, 与只应用功率控制技术的方法相比, 该方法具有较好的补偿效果, 能使误码率小于10^-7。

Mixed Rain Attenuation Compensation Algorithm of Ka-Band Satellite Communication System

In order to reduce the influence of rain attenuation on Ka-band satellite communication system, the paper puts forward a mixed rain attenuationcompensation algorithm. This algorithm combines the adaptive power control method based on principle linear forward prediction principle with rate of diversity, which can predict the rain attenuation value at moment n according to the rain attenuation values before moment n, then adjust the power. When the power control reaches to the limit, it can dynamically lower information rate according to SNR(Signal to Noise Ratio) and obtain lower BER(Bit Error Rate).The simulation results show that this method has better compensation effect andcan effectively reduce BER lower than 10^-7.