Abstract: In order to reduce rain attenuation in Ka band，a Wiener rain attenuation prediction model is established which is based on the theory of Wiener prediction.This model is based on the rain attenuation of one frequency to reduce the effect of the rain attenuation by controlled the the M of MQAM modulation and the transmission power.Compared with the DAH rain attenuation the simulation results show that the Wiener rain attenuation prediction model has good performance as well as DAH rain attenuation prediction model when the frequency is more than 21 GHz，and the maximal error is less than 0.2 dB.Compared with the DAH model，the Wiener rain attenuation prediction model greatly refines the algorithm，and improves the algorithm efficiency.

Key words: Ka band, Wiener prediction, rain attenuation, DAH model

摘要： 为了降低Ka频段雨衰的影响，基于维纳预测思想建立了一种维纳雨衰预测模型，该模型通过预测某一频率点的雨衰值来控制多进制正交幅度调制（MQAM）的阶数M和发射功率，从而降低雨衰的影响。通过和DAH雨衰预测模型的仿真比较，结果表明，当频率大于[21 GHz]时，维纳雨衰控制模型能比较精确地预测各个频率点的雨衰值，其最大误差小于0.2 dB。相比于DAH预测模型，维纳雨衰控制模型大大简化了计算量，提高了计算效率。

关键词: Ka频段, 维纳预测, 雨衰, DAH模型