卫星通信自适应传输的信道估计技术研究

Research on Channel Estimation Technology for Adaptive Transmission of Satellite Communication

摘要:

详细分析了卫星通信自适应传输系统的原理，对自适应雨衰补偿模型进行了研究，采用多组数据对地面站的上行链路和下行链路的降雨衰减关系进行拟合，推导出基于下行链路雨衰预测上行链路雨衰值的公式；为降低自适应传输系统的反馈延迟，提升传输效率和传输可靠性，构建了基于独特字序列的信号传输模型，提出了基于最大似然估计的改进方法，实现对接收信号快速、准确的信噪比测量，通过仿真分析，改进的信噪比测量算法，不受信号相位误差和频率误差的影响，相比原方法，大幅提高了信噪比估计的准确度，对卫星通信系统的自适应传输具有重要的工程应用价值。

Abstract:

A detailed analysis of the principle of satellite communication adaptive transmission system was conducted, and the adaptive rain attenuation compensation model was studied. Multiple sets of data were used to fit the rainfall attenuation relationship between the uplink and downlink of ground stations, and a formula for predicting the uplink rainfall attenuation value based on downlink rainfall attenuation was derived; In order to reduce the feedback delay of adaptive transmission systems, improve transmission efficiency and reliability, a signal transmission model based on unique word sequences was constructed, and an improved method based on maximum likelihood estimation was proposed to achieve fast and accurate signal-to-noise ratio measurement of received signals. Through simulation analysis, the improved signal-to-noise ratio measurement algorithm is not affected by signal phase errors and frequency errors. Compared with the original method, it significantly improves the accuracy of signal-to-noise ratio estimation and has important engineering application value for adaptive transmission of satellite communication systems.