Abstract:

In order to reduce the influence of rain attenuation on Ka-band satellite communication system, the paper puts forward a mixed rain attenuation compensation 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 and can effectively reduce BER lower than 10^-7.

Key words: Ka-band, satellite communication, rain attenuation, mixed compensation